GLAST Large Area Telescope: Mechanical Systems WBS: 4.1.8 Section 13 Marc Campell SLAC

J. StieberD. PlazaC. WilderJ. HodgsonM. Molini

C. WilderJ. Hodgson

G. LamM. MoliniL. LeeJ. HodgsonJ. Ku

S. Morrison PMLM team

GLAST LAT ProjectCDR/CD3 Review May 12-16, 2003Document: LAT-PR-01967Section 13 Mechanical Subsystem*

Mechanical Subsystems OverviewGrid AssemblyMid-Plate X-LAT Plate AssyEMI ShieldsSC wingsRadiator Mount BracketGrid Box Assembly

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Radiator Placement

Page Number


Major SubassembliesGrid Box AssemblyMechanical Systems Top Assembly test configurationStatic Load and Thermal Cycle testsGrid Box Base AssemblyConfiguration delivered to I & T for LAT integrationDefines base configuration for LAT assembly drawingsGrid AssemblyMechanical backboneRadiatorsFabricated and tested by LMX-LAT and Mid-platesFabricated and tested by LM

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Design & Fabrication ResponsibilitiesMechanical Systems

Manufacturing/Integration ActivityQuantity Flt/SpareResponsible OrganizationWork PerformedGrid Assembly Fabricate, inspect Grid structure1 / 0SLACSub Fabricate, test Top Flange heat pipes5 / 1LM-ATCLM-HPPC Fabricate, test Downspout heat pipes12 / 1LM-ATCLM-HPPC Assemble, test Grid assembly1 / 0SLACSLAC Fabricate, inspect EMI Skirt parts1 / 0SLACSLACX-LAT Thermal Plate Fabricate, inspect X-LAT Plate partsLM-ATCLM Fabricate, test X-LAT heat pipes9 / 1LM-ATCLM-HPPC Assemble, test X-LAT Thermal Plates2 / 1LM-ATCLM-ATC Assemble, test mid-plate1 / 0LM-ATCLM-ATCRadiators Fabricate, inspect Radiator partsLM-ATCSub Fabricate, test Radiator VC heat pipes12 / 1LM-ATCLM-HPPC Assemble, inspect Radiators2 / 0LM-ATCLM-HPPC Test RadiatorsLM-ATCLM-ATCThermal Control System Fabricate TCS hardware1 / 1SLACSub Thermal-balance test TCS system 1 / 0LM-ATCLM-ATC

LegendLM-ATCLockheed-Martin Advanced Technology Center, Palo Alto CALM-HPPCLockheed-Martin Heat Pipe Product Center, Sunnyvale CASLACStanford Linear Accelerator Center, Menlo Park CASubSubcontractor to be determined

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Design Problem AreasCAL-GRID InterfaceElectronics-Box to X-LAT Interface

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CAL-GRID Interface Design Problem StatusAt PDR & dPDR the baseline design was a bolted interface that relied on friction between the CAL plates and the Grid to react shear forces.By Peer Review, we had not demonstrated (EM test) that we could develop the coefficient of friction required at the most highly loaded (Assigned document number

>Added 'Lien List' sheet to track known potential additions to the LAT requiring mass31-Jan-02

Feb-02>Started tracking revision history and changes29-Jan-02

>Input new Mech Systems mass numbers by copy/paste into existing sheet29-Jan-02

>Input new T&DF mass numbers from Dave Nelson by copy/paste.29-Jan-02

>Repair broken links to look-up table in T&DF for reserve calculation. Checked all other sheets--no other problems29-Jan-02

>Updated all subsytem sheets to reflect "Pre-CDR" phase of project. This automatically reduced the AIAA reserve estimates29-Jan-02

>CAL input from Neil was "no changes."29-Jan-02

>Verbal from Tom Borden that there were no changes in TKR mass29-Jan-02

>No input from ACD. Estimate stands at PDR values29-Jan-02

>Changed calc's on all sheets that computes subtotal of "PARA," "CALC," and "MEAS" mass types. Old calc used database formulas that had broken in T&DF sheet. New calc uses SUMIF, that won't break29-Jan-02

>Updated Allocation calc's on 'LAT Mass Est' sheet, and copied new allocationsin 'MassHistory' sheet. These are the new baseline numbers30-Jan-02

>Fixed missing CG's on 'T&DF' sheet.30-Jan-02

>Updated 'Mech' with latest estimates.31-Jan-02

>Added 'SRR to PDR+' sheet to account for changes between baselinings31-Jan-02

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3. Mass Summary

LAT Mass Status ReportLAT-TD-00564-06

LAT Mass StatusEffective Date:7-Mar-03

Martin NordbyPrint Date:21-Apr-03

March 2003

Mass (kg)EstimateAlloc.Mass Estimate Breakdown

TKR504.9510.0(kg)%

CAL1375.81440.0Parametric382.314.3%

ACD270.1280.0Calculated975.836.4%

Mech329.3345.0Measured1321.349.3%

Elec199.3220.0Total2679.4100%

LAT Total2679.42795.0

Rsrv/Margin320.6

Rsrv/Margin*12.0%

Allocation3000.0

* AIAA G-020 recommended min reserve = 7.2%

Center of Mass (mm)

CMx1.26-20 < CMx < 20

CMy-0.54-20 < CMy < 20

CMz-86.89CMz < -51.2

Ht off LIP149.31Ht < 185

Second Moment of Inertia (kg-m2)

Ixx1057.71500.0

Iyy1014.91500.0

Izz1339.52000.0

AIAA Recm'd ReserveMargin + Reserve Estimates

(kg)%StageAIAA GoalLAT Est.

Tracker10.12.0%Proposal17.2%

Calorimeter41.53.0%SSR15.4%16.6%

ACD33.412.4%PDR9.9%14.8%

Mech Systems69.121.0%CDR5.4%

DAQ Electronics39.920.0%

LAT Total

Reserve + Margin193.97.2%

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Reserves estimated using guidelines given in ANSI/AIAA G-020-1992 "Estimating and Budgeting Weight and Power Contingencies for Space Craft Systems"

3. Mass Summary

3000260000

300026002557.2182572.32886041

300026002616.18463264182572.32886041

300026002513.08054833722572.32886041

300026002572.328860412572.32886041

30002705.1397655546367852614

30002705.13976555462541.31587664922614

30002705.13976555462521.16115882482614

30002705.13976555462574.69823701552614

30002705.13976555462590.854671522614

30002705.13976555462613.70557933822614

30002705.13976555462613.70557933822614

30002846.29981024672613.70557933822614

30002846.29981024672713.45557933822767.9955793382

30002846.29981024672713.45557933822767.9955793382

30002846.29981024672713.45557933822767.9955793382

30002846.29981024672698.99621570182767.9955793382

30002846.29981024672658.56471218182767.9955793382

30002846.29981024672679.33081218182812.9926793382

30002846.29981024672679.37663763642794.995304

30002846.2998102467377402794.995304

30002960377412794.995304

30002960384122794.995304

30003000384132794.995304

30003000385962794.995304

I-PDR

I-CDR

I-SRR

10.9%

I-PSR

LAT Reserve

LAT Margin

5.4%

Prop

dPDR

Subsystem Allocation

Mass Budget

Review Threshold

LAT Mass Estimate

Total Allocated to S.S.

Date

Mass (kg)

4. LAT Mass Status


LAT Mass StatusEff. Date:7-Mar-03


Subsystem Mass StatusAllocation Estimation

Subsystem Mass Estimates (kg)AIAACenter of Mass LocationCurrent Status of AllocationAIAA Reserve/Alloc's from Current Est's

SubsystemCurrent Alloc.PARACALCMEASTotalReserve EstimateCMx (mm)CMy (mm)CMz (mm)SubsystemCurrent Alloc (kg)Current Estimate (kg)Margin on Alloc (kg)AIAA Reserve Recom'd20% of AIAA ReserveActual Reserve AllocProposed Budget Alloc

TKR510.00.0504.90.0504.92.0%0.000.00229.95TKR510.0504.95.110.12.05.1510.0

CAL1440.053.026.51296.31375.83.0%0.000.00-148.75CAL1440.01375.864.241.58.313.71389.5

ACD280.035.5209.625.1270.112.4%0.000.00318.19ACD280.0270.19.933.46.79.9280.0

Mech345.0143.2186.00.0329.321.0%0.000.00-485.61Mech Systems345.0329.315.769.113.813.3342.5

DAQ Elec220.0150.648.70.0199.320.0%16.90-7.20-352.88DAQ Elec220.0199.320.739.98.015.6214.9

LAT Total2795.0382.3975.81321.32679.47.2%1.26-0.54-86.89Mass Total2795.02679.4115.6193.938.857.62737.0

% of Total14.3%36.4%49.3%100.0%Grid height236.20

"Current" Allocations per CCB action on 7 Mar 03149.31

LAT Mass and Moment Status

Worst-Case EstimateCurrent EstimateTot MomentTot CG Chk

Instr.+Y Rad-Y RadTotalInstr.+Y Rad-Y RadTotalUnitskg-mmmm

Mass2925.037.537.530002602.838.338.32679.4kg

Center of Mass

CMx20.0020.0020.0020.001.290.000.001.26mm33681.257

CMy20.00960.00-940.0020.00-0.55950.00-950.00-0.54mm-1435-0.536

CMz-17.90-1350.00-1350.00-51.20-49.18-1368.61-1368.61-86.89mm-232799-86.885

Moment of Inertia

Ixx1200.0150.0150.01500.0943.40.0114.31057.7kg-m^2

Iyy1300.0100.0100.01500.0832.491.391.31014.9kg-m^2

Izz1900.050.050.02000.01247.246.146.11339.5kg-m^2

Product of Inertia

Pxy25.00.025-0.02525.0-0.80.00.0-0.8kg-m^2

Pyz-1.2-1.01.00.8-49.2-0.049.80.6kg-m^2

Pzx-0.8-1.0-1.0-2.8-1.50.00.0-1.5kg-m^2

Radius of Gyration

Kxx640.512000.002000.00707.11602.041.731727.84628.30mm

Kyy666.671632.991632.99707.11565.501544.181544.18615.47mm

Kzz805.961154.701154.70816.50692.231097.491097.49707.05mm

Moments of Inertia in mm Units

Moment of Inertia

Ixx1.2E+091.5E+081.5E+081.5E+099.4E+081.1E+021.1E+081.1E+09kg-mm^2mm^2 to m^2 conv:1.00E-06

Iyy1.3E+091.0E+081.0E+081.5E+098.3E+089.1E+079.1E+071.0E+09kg-mm^2

Izz1.9E+095.0E+075.0E+072.0E+091.2E+094.6E+074.6E+071.3E+09kg-mm^2

Product of Inertia

Pxy2.5E+072.5E+04-2.5E+042.5E+07-8.1E+050.0E+000.0E+00-8.1E+05kg-mm^2

Pyz-1.2E+06-1.0E+061.0E+068.0E+05-4.9E+07-5.0E+015.0E+076.2E+05kg-mm^2

Pzx-8.0E+05-1.0E+06-1.0E+06-2.8E+06-1.5E+060.0E+000.0E+00-1.5E+06kg-mm^2

`

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5. MassHistory


3. Mass HistoryEffective Date:7-Mar-03


Event:Proposal9.2 cm SSD8.95 cm SSDSRRQ3-00 Report, TKR GapFeb-01 JOGQ1-01 ReportTim's 1st MonthI-PDR MassI-PDRI-PDR + 1Feb 02 Re-BaselineFeb 02 Close-OutFeb 02 Close-OutMay 02 Mass UpdateSep 02 Mass UpdateDec 02 ACD Mass CCBMar 7 03 Mech, CAL Mass CCBI-CDRI-CDR + 1I-PSRI-PSR + 1

1-Sep-994-Nov-9920-Apr-001-Jun-0015-Sep-0016-Sep-0028-Nov-0018-Jan-0126-Apr-019-Nov-0114-Dec-017-Jan-028-Jan-0229-Jan-0215-Feb-027-Mar-0214-Jun-0230-Sep-0218-Dec-027-Mar-0329-Apr-0330-Apr-031-Mar-052-Mar-051-Sep-05

Mass Estimate History

TKR521.8541.2522.7522.7522.7487.4487.4486.5504.9504.9504.9504.9504.9504.9504.9504.9504.9504.9504.9

CAL1549.51563.81482.11482.11482.11482.11462.91464.61466.31466.31466.31466.31466.31466.31466.31466.31404.61404.61375.8

ACD173.6173.0171.3171.3171.3171.3198.9248.2228.1228.1228.1228.1228.1228.1228.1228.1249.4270.1270.1

Mech220.2217.2216.0216.0216.0220.3191.6229.2231.7230.0230.0230.0309.7309.7309.7295.3295.3295.3329.3

Elec92.0121.0121.0180.2180.2180.2180.2146.2159.8184.4184.4184.4204.4204.4204.4204.4204.4204.4199.3

Other0.00.00.00.00.00.00.00.00.0000.00000000

LAT Total0.02557.22616.22513.12572.32541.32521.22574.72590.92613.72613.72613.72713.52713.52713.52699.02658.62679.32679.4

Subsystem Mass Allocation

TKR522.7522.7522.7522.7533.0533.0533.0533.0533.0533.0533.0533510.0510.0510.0510.0510.0510.0510.0

CAL1482.11482.11482.11482.11492.01492.01492.01492.01492.01492.01492.014921480.01480.01480.01480.01480.01480.01440.0

ACD199.3199.3199.3199.3205.0205.0205.0205.0205.0205.0205.0205235.0235.0235.0235.0235.0280.0280.0

Mech188.0188.0188.0188.0196.0196.0196.0196.0196.0196.0196.0196323.0323.0323.0323.0323.0323.0345.0

Elec180.2180.2180.2180.2188.0188.0188.0188.0188.0188.0188.0188220.0220.0220.0220.0220.0220.0220.0

Other0.00.00.00.00.00.00.00.00.00.00.000000000

Total Allocated to S.S.0.02572.32572.32572.32572.32614.02614.02614.02614.02614.02614.02614.02614.02768.02768.02768.02768.02768.02813.02795.02795.02795.02795.02795.02795.0

LAT IPO Totals

LAT Mass Est (from above)0.02557.22616.22513.12572.30.02541.32521.22574.72590.92613.72613.72613.72713.52713.52713.52699.02658.62679.32679.4

Reserve allocated to S.S.'s0.015.1-43.959.20.02614.072.792.839.323.10.30.30.354.554.554.569.0109.4133.7115.6

LAT-IPO Reserve27.727.727.727.791.191.191.191.191.191.191.1232.378.378.378.378.378.333.351.351.3165.00165.00205.00

Review Threshold260026002600260026002705.12705.12705.12705.12705.12705.12705.12846.32846.32846.32846.32846.32846.32846.32846.32846.32960296030003000

Unallocated Margin400400400400294.9294.9294.9294.9294.9294.9153.7153.7153.7153.7153.7153.7153.7153.7153.74040

Mass Budget3000300030003000300030003000300030003000300030003000300030003000300030003000300030003000300030003000

SS Rsv + IPO Rsv + margin0.0442.8383.8486.9427.73000.0458.7478.8425.3409.191.4386.3386.3286.5286.5286.5301.0341.4320.7320.6

Reserve (IPO Rev /Tot SS Alloc)1.1%1.1%1.1%1.1%3.5%3.5%3.5%3.5%3.5%3.5%8.9%2.8%2.8%2.8%2.8%2.8%1.2%1.8%5.9%5.9%

Margin (3000 / Threshold - 1)15.4%15.4%15.4%15.4%10.9%10.9%10.9%10.9%10.9%10.9%5.4%5.4%5.4%5.4%5.4%5.4%5.4%5.4%1.4%1.4%

NotesTKR, CAL, ACD, Grid updated from Proposal numbers. Uses Proposal reserveNew Instrument footprint, updated masses for TKR, CAL, GridMass shown at SRR, with new electronics box massIncreased tower pitch to 373.5 mm. Updated TKR dims and mass. No change to Grid web thkUpdated CFC CAL dims, mass; Grid dims changed per CAL mod's (29 Nov 00). Thermal Blanket from Mech to ACD (18 Jan 01)Updated Grid, Radiators. New wall thk's. Updated CAL w/EM CsI crystal dims. New ACD masses. Moved ACD elec to ACD.New mass est method. All info from TimUpdated mass on Elec boxes from Dave Nelson.Same as previous estimate. This was shown at PDRSame as PDR mass estimateAdded EMI Shield box to Mech. Added Radiator Re-Pkg to Mech. Added cable ways to Elec.Clsoe-out of Feb 02 changes. Added 20 kg back to LAT Mass Budget, to total 3000 kgMar 2002 update: no changesMay 2002 update to mass estimates; only change is Mech RadiatorsSep 2002 Mass UpdateDec 2002 ACD Mass CCB. No other subsystem masses or allocations were changedMar 2003 Mech Mass CCB. No other estimates received.

Variance (Alloc - Estimate)

TKR0.9-18.50.00.010.345.645.646.528.128.128.128.15.15.15.15.15.15.15.1

CAL-67.4-81.70.00.09.99.929.127.425.725.725.725.713.713.713.713.775.475.464.2

ACD25.726.328.028.033.733.76.1-43.2-23.1-23.1-23.1-23.16.96.96.96.9-14.49.99.9

Mech-32.2-29.2-28.0-28.0-20.0-24.34.4-33.2-35.7-34.0-34.0-34.013.313.313.327.727.727.715.7

Elec88.259.259.20.07.87.87.841.828.23.63.63.615.615.615.615.615.615.620.7

Other0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Total Mass Variance15.1-43.959.20.041.772.792.839.323.10.30.30.354.554.554.569.0109.4133.7115.6

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6. Lien List

Mass LiensLAT Mass Status ReportEff. Date:7-Mar-03


Implemented?SubsystemDescriptionMass (kg)Comments

Total52.5

T&DFAdditional boards in the spare electronics boxes7.5Not expected to need extra boards, but we have 3 empty boxes and they may get filled

MechWeight to balance LAT c.g. on z-axis25Not currently required. 25 kg balances our current imbalance if put in a center bay, with 2x margin.

AllFly-away instrumentation20This is a WAG. Plan to address this in Test Planning meetings to spec test req's, and what instrumentation (if any) is needed.

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7. CM and MOI

LAT Mass Status ReportLAT-TD-00564-06LAT-TD-00564-06

LAT Center of Mass and Second Moment of Inertia Allocation Work SheetEff. Date:7-Mar-03Eff. Date:7-Mar-03

Martin NordbyPrint Date:21-Apr-03Print Date:21-Apr-03

Current Estimates of Mass, Center of Mass and SizeFirst Moment of InertiaCalculated Second Moment of Inertia Using Estimated Masses and Center of Mass LocationsExpected Max Values of Mass and Center of Mass LocationFirst Moment of InertiaCalculated Second Moment of Inertia Using Maximum Masses and Center of Mass Locations

CurrentCurrent CG EstimateBounding Dim'sEst Mom=CM Est*Mass EstCentroid MOI EstimateMOI Estimate from XYZ = 0POI Estimate from XYZ = 0Mass Growth/VariationAllocMax CG AllocationMax Mom=CM Alloc*Max MassMOI Alloc from XYZ = 0POI Alloc from XYZ = 0

M EstCMx EstCMy EstCMz EstXYZMx EstMy EstMz EstIxx' EstIyy' EstIzz' EstIxx EstIyy EstIzz EstPxy EstPyz EstPzx EstGrowthM MaxVarX/Y OffsetCMx AllocCMy AllocCMz AllocMx MaxMy MaxMz MaxIxx MaxIyy MaxIzz MaxPxy MaxPyz MaxPzx MaxMOI calculation method

Total Alloc3000.02020-51.260,00060,000-153,6001.500E+091.500E+092.000E+092.500E+078.000E+05-2.800E+06

LAT-Rad Alloc2925.02020-17.958,50058,500-52,3501.200E+091.300E+091.900E+092.495E+07-1.200E+06-8.000E+05

Radiator Alloc75.02020-1350.01,5001,500-101,2503.000E+082.000E+081.000E+085.000E+042.000E+06-2.000E+06

LAT Total2679.41.257-0.536-86.8853,368-1,435-232,7991.058E+091.015E+091.339E+09-8.063E+056.189E+05-1.452E+062989.818.06916.061-64.61954,02248,019-193,2021.171E+091.131E+091.544E+091.695E+075.320E+05-1.869E+06

Counterweight0790790-23030050500000.000E+000.000E+000.000E+000.000E+000.000E+000.000E+0025-790-790-230-19,750-19,750-5,7501.693E+071.693E+073.121E+071.560E+074.543E+064.543E+06Distributed over bounding Dims

LAT w/out weight2679.41.257-0.536-86.8853,368-1,435-232,7991.058E+091.015E+091.339E+09-8.063E+056.189E+05-1.452E+062964.824.88222.857-63.22573,77267,769-187,4521.154E+091.114E+091.513E+091.350E+06-4.010E+06-6.412E+06Sum of inertias below

TKR504.90.0000.000229.9501498149864000116,1111.117E+081.117E+081.888E+081.384E+081.384E+081.888E+080.000E+000.000E+000.000E+00510.033.49833.498245.00017,08417,084124,9501.440E+081.440E+081.919E+085.723E+054.186E+064.186E+06Distributed over footprint of 4*pitch

Per module31.60.0000.000229.950007,25731.910.00010.00010.000245.0003193197,809

Mass variation2.0749749

CAL1375.80.0000.000-148.75314981498224.300-204,6492.630E+082.630E+085.145E+082.935E+082.935E+085.145E+080.000E+000.000E+000.000E+001480.018.09718.097-120.00026,78426,784-177,6003.048E+083.048E+085.545E+084.847E+05-3.214E+06-3.214E+06Distributed over footprint of 4*pitch

Per module86.00.0000.000-148.75300-12,79192.510.00010.00010.000-120.000925925-11,100


ACD270.10.0000.000318.1851700170010500085,9531.798E+081.798E+082.602E+082.071E+082.071E+082.602E+080.000E+000.000E+000.000E+00320.010.00010.00010.000340.0003,2003,200108,8002.500E+082.500E+083.083E+083.200E+041.088E+061.088E+06Hollow 4-sided box

Mech Systems329.30.0000.000-485.61100-159,8903.560E+083.100E+082.988E+080.000E+000.000E+000.000E+00400.018.12518.125-407.5007,2507,250-163,0003.804E+083.353E+083.563E+081.375E+05-2.248E+06-2.248E+06

Grid Box252.70.0000.000-218.04715661566536.200-55,0981.154E+081.154E+082.066E+081.274E+081.274E+082.066E+080.000E+000.000E+000.000E+00325.020.0020.00020.000-190.0006,5006,500-61,7501.603E+081.603E+082.659E+081.300E+05-1.235E+06-1.235E+06Hollow 4-sided box; side = 4*pitch

+Y Radiator38.30.000950.000-1368.6131903501586036,370-52,3968.033E+061.958E+071.156E+071.143E+089.129E+074.611E+070.000E+00-4.978E+070.000E+0037.510.0010.000960.000-1350.00037536,000-50,6251.108E+088.753E+074.589E+073.600E+05-4.860E+07-5.063E+05Distributed over bounding Dims

-Y Radiator38.30.000-950.000-1368.61319035015860-36,370-52,3968.033E+061.958E+071.156E+071.143E+089.129E+074.611E+070.000E+004.978E+070.000E+0037.510.0010.000-940.000-1350.000375-35,250-50,6251.093E+088.753E+074.446E+07-3.525E+054.759E+07-5.063E+05Distributed over bounding Dims

Electronics199.316.899-7.202-352.8763368-1435-70,3246.277E+076.602E+077.706E+07-8.063E+056.189E+05-1.452E+06254.876.33952.780-316.2821945413451-806017.534E+077.970E+071.016E+081.236E+05-3.822E+06-6.224E+06

TEM42.80.0000.000-266.200149814982800-11,4068.015E+068.015E+061.603E+071.105E+071.105E+071.603E+070.000E+000.000E+000.000E+0051.278.51678.516-250.0004,0204,020-12,8001.309E+071.309E+071.978E+073.156E+05-1.005E+06-1.005E+06Distributed over footprint of 4*pitch

Per module2.70.0000.000-266.20000-7133.220.0020.00020.000-250.0006464-800


TPS51.20.0000.000-331.200149814988200-16,9579.603E+069.603E+061.915E+071.522E+071.522E+071.915E+070.000E+000.000E+000.000E+0059.270.60870.608-300.0004,1804,180-17,7601.673E+071.673E+072.273E+072.951E+05-1.254E+06-1.254E+06Distributed over footprint of 4*pitch

Per module3.20.0000.000-331.20000-1,0603.720.0020.00020.000-300.0007474-1,110


Special Boxes53.762.742-26.740-431.2003,368-1,435-23,1451.796E+072.121E+071.910E+07-8.063E+056.189E+05-1.452E+0625.0%67.187.742-1.740-400.0005,887-117-26,8382.066E+072.503E+072.408E+07-9.055E+054.670E+04-2.355E+06

GASU14.00.0000.000-431.200680390112.500-6,0371.922E+055.542E+057.169E+052.795E+063.157E+067.169E+050.000E+000.000E+000.000E+0025.0%17.525.0025.00025.000-400.000438438-7,0003.051E+063.504E+069.180E+051.094E+04-1.750E+05-1.750E+05Distributed over size of box

SIU12.5561.7500.000-431.200300300112.57,0220-5,3901.069E+051.069E+051.875E+052.431E+066.376E+064.132E+060.000E+000.000E+00-3.028E+0625.0%15.625.00586.75025.000-400.0009,168391-6,2502.643E+068.013E+065.623E+062.292E+05-1.563E+05-3.667E+06Distributed over size of box

PDU4.0-561.7500.000-431.200300675112.5-2,2190-1,7031.541E+053.379E+041.796E+058.886E+052.015E+061.426E+060.000E+000.000E+009.568E+0525.0%4.925.00-536.75025.000-400.000-2,650123-1,9759.858E+052.255E+061.650E+06-6.626E+04-4.938E+041.060E+06Distributed over size of box

EPU4.5-561.750-561.750-431.200300300112.5-2,528-2,528-1,9403.850E+043.850E+046.750E+042.295E+062.295E+062.908E+061.420E+061.090E+061.090E+0625.0%5.625.00-536.750-536.750-400.000-3,019-3,019-2,2502.569E+062.569E+063.326E+061.621E+061.208E+061.208E+06Distributed over size of box

EPU4.5561.750-561.750-431.200300300112.52,528-2,528-1,9403.850E+043.850E+046.750E+042.295E+062.295E+062.908E+06-1.420E+061.090E+06-1.090E+0625.0%5.625.00586.750-536.750-400.0003,300-3,019-2,2502.569E+062.885E+063.641E+06-1.772E+061.208E+06-1.320E+06Distributed over size of box

EPU4.5-561.750561.750-431.200300300112.5-2,5282,528-1,9403.850E+043.850E+046.750E+042.295E+062.295E+062.908E+06-1.420E+06-1.090E+061.090E+0625.0%5.625.00-536.750586.750-400.000-3,0193,300-2,2502.885E+062.569E+063.641E+06-1.772E+06-1.320E+061.208E+06Distributed over size of box

MTY1.9-187.250-561.750-431.200300300112.5-364-1,093-8391.664E+041.664E+042.918E+049.920E+054.465E+057.111E+052.046E+054.711E+051.570E+0525.0%2.425.00-162.250-536.750-400.000-394-1,305-9731.110E+064.738E+058.009E+052.117E+055.220E+051.578E+05Distributed over size of box

MTY1.9187.250-561.750-431.200300300112.5364-1,093-8391.664E+041.664E+042.918E+049.920E+054.465E+057.111E+05-2.046E+054.711E+05-1.570E+0525.0%2.425.00212.250-536.750-400.000516-1,305-9731.110E+065.193E+058.464E+05-2.770E+055.220E+05-2.064E+05Distributed over size of box

MTY1.9-187.250561.750-431.200300300112.5-3641,093-8391.664E+041.664E+042.918E+049.920E+054.465E+057.111E+05-2.046E+05-4.711E+051.570E+0525.0%2.425.00-162.250586.750-400.000-3941,427-9731.247E+064.738E+059.375E+05-2.315E+05-5.706E+051.578E+05Distributed over size of box

MTY1.9187.250561.750-431.200300300112.53641,093-8391.664E+041.664E+042.918E+049.920E+054.465E+057.111E+052.046E+05-4.711E+05-1.570E+0525.0%2.425.00212.250586.750-400.0005161,427-9731.247E+065.193E+059.830E+053.028E+05-5.706E+05-2.064E+05Distributed over size of box

MTY1.9561.750561.750-431.200300300112.51,0931,093-8391.664E+041.664E+042.918E+049.920E+059.920E+051.257E+066.138E+05-4.711E+05-4.711E+0525.0%2.425.00586.750586.750-400.0001,4271,427-9731.247E+061.247E+061.711E+068.370E+05-5.706E+05-5.706E+05Distributed over size of box

Elec Misc51.60.0000.000-364.89200-18,8151.854E+071.854E+072.279E+070.000E+000.000E+000.000E+0077.369.39369.393-300.0005,3675,367-23,2042.485E+072.485E+073.502E+074.184E+05-1.610E+06-1.610E+06

Hardware (lot)2.50.0000.000-331.2001498149822500-8284.780E+054.780E+059.350E+057.523E+057.523E+059.350E+050.000E+000.000E+000.000E+0050.0%3.850.00050.00050.000-300.000188188-1,1251.064E+061.064E+061.421E+069.375E+03-5.625E+04-5.625E+04Distributed over footprint of 4*pitch

Cables13.50.0000.000-331.2001498149822500-4,4592.575E+062.575E+065.036E+064.051E+064.051E+065.036E+060.000E+000.000E+000.000E+0050.0%20.250.00050.00050.000-300.0001,0101,010-6,0595.730E+065.730E+067.654E+065.049E+04-3.029E+05-3.029E+05Distributed over footprint of 4*pitch

ACD Ext Cables9.40.0000.000-380.0001498149822500-3,5573.580E+063.580E+067.001E+064.931E+064.931E+067.001E+060.000E+000.000E+000.000E+0050.0%14.050.00050.00050.000-300.000702702-4,2126.668E+066.668E+061.057E+073.510E+04-2.106E+05-2.106E+05Hollow 4-sided box; side = 4*pitch

ACD Int Cables6.20.0000.000-380.0001498149822500-2,3711.193E+061.193E+062.334E+062.094E+062.094E+062.334E+060.000E+000.000E+000.000E+0050.0%9.450.00050.00050.000-300.000468468-2,8082.656E+062.656E+063.547E+062.340E+04-1.404E+05-1.404E+05Distributed over footprint of 4*pitch

Cable trays, misc20.00.0000.000-380.0001498149822500-7,6003.824E+063.824E+067.480E+066.712E+066.712E+067.480E+060.000E+000.000E+000.000E+0050.0%30.0100.000100.000100.000-300.0003,0003,000-9,0008.737E+068.737E+061.182E+073.000E+05-9.000E+05-9.000E+05Distributed over footprint of 4*pitch

&L&A&C&F&RPage &P of &N

TKR

Project PhasePre-CDRSubsystem :TKR ModuleDate of lastest Update :07-Mar-02

List NoPart or Dwg No.Component Name/Desc.QuantityMass (Kg)Mass Estimation Method (PARA, CALC, or MEAS)Total (Kg)Development Class (1, 2, or 3)Calculated Contingency Recommendation (ANSI/AIAA-G-020-1992)X-Axis Center of Mass (mm)Y-Axis Center of Mass (mm)Z-Axis Center of Mass (mm)

1102-TKR-13-3100-1Top Tray11.254CALC1.25432%0.00.0229.95Pre-PDR123Pre-PDRPARA

2102-TKR-13-3000-1Regular Tray111.143CALC12.57632%0.00.0229.9500.350.250.03Pre-CDRCALC

3102-TKR-13-3000-3SuperGLAST Tray42.569CALC10.27732%0.00.0229.95500.30.20.03Pre-PRRMEAS

4102-TKR-13-3000-2Regular Tray No Converter20.873CALC1.74632%0.00.0229.955000.250.150.01

5102-TKR-13-3100-1Bottom Tray10.974CALC0.97432%0.00.0229.9525000.220.120.005

6102-TKR-13-2110-1Sidewall10.609CALC0.60932%0.00.0229.95Pre-CDR

7102-TKR-13-2111-1Sidewall10.609CALC0.60932%0.00.0229.9500.250.20.02



10Cable10.155CALC0.15532%0.00.0229.9525000.150.10.006

11Cable10.155CALC0.15532%0.00.0229.95Pre-PRR

12Cable10.155CALC0.15532%0.00.0229.9500.150.120.01

13Cable10.155CALC0.15532%0.00.0229.95500.10.10.01

14Cable10.155CALC0.15532%0.00.0229.955000.10.050.005

15Cable10.155CALC0.15532%0.00.0229.9525000.10.050.005

16Cable10.155CALC0.15532%0.00.0229.95

17Cable10.155CALC0.15532%0.00.0229.95

18102-TKR-13-3200-1Flexure Side10.440CALC0.44032%0.00.0229.95Mass Estimation Method (PARA, CALC, or MEAS)Mass Estimation Method (PARA, CALC, or MEAS)Mass Estimation Method (PARA, CALC, or MEAS)

19102-TKR-13-3201-1Flexure Corner10.335CALC0.33532%0.00.0229.95paracalcmeas

20Thermal Gasket10.034CALC0.03432%0.00.0229.95

21Sidewall Fasteners10.211CALC0.21132%0.00.0229.95

22Sidewall Tape10.021CALC0.02132%0.00.0229.95

23Tower Attach Bolts10.016CALC0.01632%0.00.0229.95

240.000-

250.000-

260.000-

270.000-

280.000-

290.000-

300.000-

310.000-

320.000-

330.000-

340.000-

350.000-

360.000-

370.000-

380.000-

390.000-

400.000-

410.000-

420.000-

430.000-

440.000-

450.000-

460.000-

470.000-

480.000-

490.000-

500.000-

Total for 1 ModuleTotal Mass31.5592%0.000.00229.95

Total MassCenter of Mass(x,y,z)

Total PARA Mass0.0000.0%Contingencyfor this Module

Total CALC Mass31.559100.0%

Total MEAS Mass0.0000.0%

31.559100.0%

Total for 16 ModulesTotal Mass504.9382%0.000.00229.95





504.938100.0%

Development ClassMethod of Mass Determination

1A new design which is one-of-a-kind or aWAGBest Estimate based on component

first generation device.parameters.

2A generational design that follows aCALCEstimate based on calculated mass from

previously developed concept and expandsdetailed design documentation.

complexity of capability within anMEASActual mass measurements of component

established design envelope, including new

hardware applications to meet new

requriements.

3A production level development based on an

existing design for which multiple units are

planned, and a significant amount of

standardization exists.

CAL

Project PhasePre-CDRSubsystem :CAL ModuleDate of lastest Update :20-Sep-02


1LAT-DS-01115-01CsI Crystal960.773MEAS74.24132%0.0000.000-146.370Pre-PDR123Pre-PDRPARA

2PIN Photodiode1920.0016MEAS0.30732%0.0000.000-146.37000.350.250.03Pre-CDRCALC

3Twisted Wire Pair1920.0001CALC0.019220%0.0000.000-146.370500.30.20.03Pre-PRRMEAS

4Optical Bond Material1920.0002MEAS0.03832%0.0000.000-146.3705000.250.150.01

5Optical Reflective Wrap960.0033MEAS0.31732%0.0000.000-146.37025000.220.120.005

6End Cap1920.0006MEAS0.115220%0.0000.000-146.370Pre-CDR

70.000-00.250.20.02

8Printed Circuit Board (AFEE)40.360CALC1.440220%0.0000.000-134.160500.20.150.02

9AFEE-TEM Cable40.050CALC0.200125%0.0000.000-256.2005000.20.10.008

10AFEE-TEM Cable Bracket40.005PARA0.020125%0.0000.000-256.20025000.150.10.006

110.000-Pre-PRR

12LAT-DS-00918-01Composite Structure12.651MEAS2.651220%0.0000.000-147.20000.150.120.01

13LAT-DS-00927-01EMI Shield10.029MEAS0.02932%0.0000.000-45.400500.10.10.01

14LAT-DS-01234-01Insert, Side400.001MEAS0.05732%0.0000.000-147.2005000.10.050.005

15LAT-DS-00928-01Insert, Top Composite160.001MEAS0.02332%0.0000.000-147.20025000.10.050.005

16LAT-DS-00929-01Insert, Bottom Composite250.005MEAS0.11432%0.0000.000-147.200

170.000-

18LAT-DS-00917-01Top Frame10.625MEAS0.62532%0.0000.000-36.450Mass Estimation Method (PARA, CALC, or MEAS)Mass Estimation Method (PARA, CALC, or MEAS)Mass Estimation Method (PARA, CALC, or MEAS)

19LAT-DS-00919-01Base Plate13.190PARA3.19032%0.0000.000-238.168paracalcmeas

20LAT-DS-00920-01Close-Out Plate X Assembly20.330MEAS0.66032%0.0000.000-133.230

21LAT-DS-00921-01Close-Out Plate Y Assembly20.330MEAS0.66032%0.0000.000-133.230

22LAT-DS-00923-01Side Panel X20.146MEAS0.29232%0.0000.000-132.780

23LAT-DS-00924-01Side Panel Y20.146MEAS0.29232%0.0000.000-132.780

240.000-

25LAT-DS-00922-01Nut400.0016MEAS0.06432%0.0000.000-147.200

260.000-0.0000.000

27LAT-DS-00925-01Bumper (Elastomer)1920.0004MEAS0.077220%0.0000.000-146.370

28LAT-DS-00925-01Bumper Frame (Delrin)1920.0004MEAS0.077220%0.0000.000-146.370

29LAT-DS-00926-01Spacer (Omit from Current Design)PARA0.000-

30Elastomeric Cords3840.0002MEAS0.077220%0.0000.000-146.370

310.000-

32Fasteners10.300MEAS0.30032%0.0000.000-146.370

330.000-

34Miscellaneous10.100PARA0.100125%0.0000.000-146.370

35

360.000-

Total for 1 ModuleTotal Mass85.9853%0.000.00-148.75


Total PARA Mass3.3103.8%Contingency



85.985100.0%

Total for 16 ModulesTotal Mass1375.7593%0.000.00-148.75





1375.759100.0%









requriements.





ACD

Project PhasePre-CDRSubsystem :ACDDate of lastest Update :01-Oct-02


1Mechanical Hardware0.000-Pre-PDR123Pre-PDRPARA

22054514Shell129.800CALC29.800220%0.000.00465.0000.350.250.03Pre-CDRCALC

32054515Tile Tiedowns3400.018MEAS6.222220%0.000.00499.00500.30.20.03Pre-PRRMEAS

4Bottom Tile Tiedowns320.100PARA3.200125%5000.250.150.01

52054531Shell/Base Corner Flexures40.748PARA2.991220%0.000.00-11.7025000.220.120.005

62054532Shell/Base Middle Flexures40.748CALC2.991220%0.000.00-11.70Pre-CDR

7Shell/Base Flexure Hardware80.200PARA1.600220%0.000.00-11.7000.250.20.02

82054535Base Frame with closeouts125.278CALC25.278220%0.000.00-126.70500.20.150.02

9ACD/LAT interface hardware10.600PARA0.60032%0.000.00-166.005000.20.10.008

100.000-25000.150.10.006

11Tile Detector Assemblies0.000-Pre-PRR

122054509Tiles195.365CALC95.36532%0.000.00499.0000.150.120.01

13Fiber14.037PARA4.03732%0.000.00499.00500.10.10.01

14Fiber Ribbons (850 mm)40.177PARA0.70732%0.000.00499.005000.10.050.005

15Fiber Ribbons (3370 mm)40.171PARA0.68632%0.000.00499.0025000.10.050.005

16Fiber connectors650.029MEAS1.885220%0.000.00499.00

17Fiber/PMT connectors1940.018MEAS3.531220%0.000.00-25.00

182054505Tile wrapping17.770PARA7.77032%0.000.00499.00Mass Estimation Method (PARA, CALC, or MEAS)Mass Estimation Method (PARA, CALC, or MEAS)Mass Estimation Method (PARA, CALC, or MEAS)

19Clear fiber Cable wrapping13.638PARA3.63832%0.000.00499.00paracalcmeas

20Fiber to Tile adhesive10.000PARA0.00032%0.000.00499.00

21Wrapping adhesive10.000PARA0.00032%0.000.00499.00

22Fiber tiedowns13.062PARA3.06232%0.000.00499.00

230.000-

24Electronic Hardware0.000-

252054536FREE Board with 2x FREE PCB120.503CALC6.036125%0.000.00126.70

262054542High Voltage Bias Supply240.094CALC2.256125%0.000.00-100.00

27Power Distribution board120.144CALC1.728220%

28Chassis Structure82.009CALC16.071220%

29Bulkhead connector (with wiring)260.050MEAS1.30032%0.000.00-126.70

30PMT's (PMT, housings, dynode)1940.063MEAS12.125125%0.000.00-85.00

31Harnessing120.024PARA0.28832%

32Cable tiedowns240.001PARA0.02432%0.000.00-126.70

33Fasteners, Safety Cable & Staking11.500PARA1.50032%0.000.00126.70

340.000-

35Thermal Hardware0.000-

36Thermal Heaters and Thermostats00.000PARA0.00032%

37Thermistors, wiring and tiedowns12.380PARA2.38032%

382054530Micrometerite/Thermal Blanket130.080CALC30.080220%0.000.00438.00

392054533Micro/Thermal blanket hardware12.984PARA2.984220%0.000.00438.00

400.000-

Total Mass270.13612.4%0.000.00318.19





270.136100.0%









requriements.





Mech

Project PhasePre-CDRSubsystem :MechDate of latest Update :28-Feb-03


10Grid Box Assembly00.00000.00000%0.0000.000Pre-PDR123Pre-PDRPARA

20Connector Patch Plate80.750PARA6.000125%0.0000.00000.350.250.03Pre-CDRCALC

30Connector Plate mounting hardware10.300PARA0.300220%0.0000.000500.30.20.03Pre-PRRMEAS

40000.00000.00000%0.0000.0000.0005000.250.150.01

50TCS Connector Support Bracket00.000PARA0.000125%0.0000.00025000.220.120.005

60TCS mounting hardware10.300PARA0.300220%0.0000.000Pre-CDR

70000.00000.00000%0.0000.0000.00000.250.20.02

80TCS External Box00.00000.00000%0.0000.000500.20.150.02

90External Box Base10.500PARA0.500125%0.0000.0005000.20.10.008

100External Box Cover10.250PARA0.250125%0.0000.00025000.150.10.006

110000.00000.00000%0.0000.0000.000Pre-PRR

120X-LAT Plates (qty:2)00.00000.00000%0.0000.0000.00000.150.120.01

130X-LAT Heat Pipes 1/2"60.680PARA4.080220%0.0000.000-500.000500.10.10.01

140Base Face Sheet27.733PARA15.466125%0.0000.000-500.0005000.10.050.005

150Thermal Straps480.144PARA6.912125%0.0000.000-500.00025000.10.050.005

160Thermal Backing Strips480.068PARA3.264125%0.0000.000-500.000

170Mounting Bolt Stand-Offs480.060PARA2.880125%0.0000.000-500.000

180X-LAT-Elec box mounting bolts11.625PARA1.625220%0.0000.000-500.000Mass Estimation Method (PARA, CALC, or MEAS)Mass Estimation Method (PARA, CALC, or MEAS)Mass Estimation Method (PARA, CALC, or MEAS)

190X-LAT-Elec box washers10.813PARA0.813220%0.0000.000-500.000paracalcmeas

200X-LAT-Elec box adhesive10.100PARA0.100220%0.0000.000-500.000

210X-LAT-Patch Plate mounting bolts11.000PARA1.000220%0.0000.000-500.000

220X-LAT-Patch Plate washer10.500PARA0.500220%0.0000.000-500.000

230000.00000.00000%0.0000.0000.000

240Mid-Plate00.00000.00000%0.0000.0000.000

250Base Face Sheet16.953PARA6.953125%0.0000.000-500.000

260Thermal Straps160.144PARA2.304125%0.0000.000-500.000

270Thermal Backing Strips160.068PARA1.088125%0.0000.000-500.000Rad MomRad MassZ CG

280Mounting Bolt Stand-Offs160.005PARA0.080125%0.0000.000-500.000-29336.85181.535-161.6041067495

290X-LAT-Elec box mounting bolts10.300PARA0.300220%0.0000.000-500.000

300X-LAT-Elec box washers10.195PARA0.195220%0.0000.000-500.000

310X-LAT-Elec box heat transfer tape10.100PARA0.100220%0.0000.000-500.000Grid Box MomGrid Box MassZ CG

320X-LAT-Patch Plate mounting bolts11.000PARA1.000220%0.0000.000-500.000-109520.8606118.402-924.9885545544

330X-LAT-Patch Plate washer10.500PARA0.500220%0.0000.000-500.000

340000.00000.00000%0.0000.0000.000

350EMI Skirt Pieces00.00000.00000%0.0000.0000.000

360Center X-EMI-Shield22.000PARA4.000125%0.0000.000-350.000

370Center Y-EMI-Shield21.400PARA2.800125%0.0000.0000.000

380Shield Plate-Grid mounting bolts11.000PARA1.000220%0.0000.000-350.000

390Shield Plate-Grid washers10.500PARA0.500220%0.0000.000-350.000

400LF-Hand Outer X-EMI-Shield20.600PARA1.200220%0.0000.000-350.000

410RT-Hand Outer X-EMI-Shield20.600PARA1.200220%0.0000.000-350.000

420LF-Hand Outer Y-EMI-Shield20.600PARA1.200220%0.0000.000-350.000

430RT-Hand Outer Y-EMI-Shield20.600PARA1.200220%0.0000.000-350.000

440EMI Skirt mounting bolts10.300PARA0.300220%0.0000.0000.000

450EMI Skirt mounting washers10.218PARA0.218220%0.0000.0000.000

460EMI tape11.000PARA1.000220%0.0000.0000.000

470000.00000.00000%0.0000.0000.000

480MLI Blankets00.00000.00000%0.0000.0000.000

490Underside MLI blanket11.000PARA1.000125%0.0000.000-500.000

500Sun-Side MLI Blanket10.500PARA0.500125%0.0000.000-350.000

510Shade-Side MLI Blanket10.500PARA0.500125%0.0000.000-350.000

520MLI mounting hardware and straps11.000PARA1.000125%0.0000.000-350.000

530000.00000.00000%0.0000.0000.000

540Grid Box Base Assembly00.00000.00000%0.0000.000-1317.753

550Heat Pipe Patch Panel00.00000.00000%0.0000.0000.000

560Patch Panel42.000CALC8.000125%0.0000.000-350.000

570Downspout Heat Pipes120.250PARA3.000220%0.0000.000-350.000

580Heli-coil inserts10.500PARA0.500220%0.0000.000-350.000

590Patch Plate-Grid mounting bolts10.500PARA0.500220%0.0000.000-350.000

600Patch Plate-Grid washers10.250PARA0.250220%0.0000.000-350.000

610Patch Plate-Grid heat transfer tape10.100PARA0.100220%0.0000.000-350.000

620Heat Pipe-Grid mounting bolts10.500PARA0.500220%0.0000.000-350.000

630Heat Pipe-Grid washers10.250PARA0.250220%0.0000.000-350.000

640Heat Pipe-Grid heat transfer tape10.100PARA0.100220%0.0000.000-350.000

650Radiator Mount Bracket00.00000.00000%0.0000.0000.000

660Mount Brackets44.000PARA16.000125%0.0000.000-350.000

670Rad Mnt Plate-Grid mounting bolts12.000PARA2.000220%0.0000.000-350.000

680Thermostats11.000PARA1.00000%0.0000.0000.000

690Flight Heaters80.100PARA0.80000%0.0000.0000.000

700Harness/Cables12.000PARA2.00000%0.0000.0000.000

710000.00000.00000%0.0000.0000.000

720Grid Assembly00.00000.00000%0.0000.0000.000

7304 X 4 Grid1114.442CALC114.442120%0.0000.000-100.000

740Spacecraft Interface Stiffener(SIS)42.700PARA10.800220%0.0000.000-100.000

750SIS Mounting Bolts11.100PARA1.10000%0.0000.0000.000

760000.00000.00000%0.0000.0000.000

770SIS Mounting Keys10.400PARA0.400220%0.0000.0000.000

780SIS Mounting Washers10.030PARA0.030220%0.0000.0000.000

790Inserts for #8 CAL screws12.400PARA2.400220%0.0000.000-100.000

800Inserts for #6 CAL screws10.700PARA0.700220%0.0000.000-100.000

810000.00000.00000%0.0000.0000.000

820Grid Heat Pipes00.00000.00000%0.0000.0000.000

830Top Flange Heat Pipes50.431CALC2.157220%0.0000.000-10.000

840Purge Groove Cover Plate50.090CALC0.448220%0.0000.000-10.000

850Adhesive for 3/8" heat pipe11.668CALC1.668220%0.0000.000-10.000

860000.00000.00000%0.0000.0000.000

870Grid Mounting Hardware00.00000.00000%0.0000.0000.000

880CAL mount #8 screws14.700PARA4.700220%0.0000.000-236.000

890CAL mount #6 screws11.100PARA1.100220%0.0000.000-236.000

900CAL mount bolt backing plate400.009CALC0.365125%0.0000.000-236.000

910CAL mount bolt washer11.000PARA1.000220%0.0000.000-236.000

920000.00000.00000%0.0000.0000.000

930Miscellaneous Grid Hardware00.00000.00000%0.0000.0000.000

940Thermistors10.250PARA0.250220%0.0000.000-100.000

950Fly-away Accelerometers11.000PARA1.000220%0.0000.000-100.000

960Cable mounting hardware11.000PARA1.000220%0.0000.000-100.000

970000.00000.00000%0.0000.0000.000

980Radiators00.00000.00000%0.0000.0000.000

990Radiator Miscellaneous Hardware00.00000.00000%0.0000.0000.000

1000Backside MLI21.000PARA2.000220%0.0000.000-1292.000

1010MLI mounting straps10.500PARA0.500220%0.0000.000-1292.000

1020Attachment Fasteners160.009PARA0.144220%0.0000.000-1292.000

1030Radiator Mounting Fasteners10.291PARA0.291220%0.0000.000-1292.000

1040VCHP support brackets22.000PARA4.000125%0.0000.000-1292.000

1050VCHP-Patch Plate mounting bolts11.000PARA1.000220%0.0000.000-1292.000

1060VCHP-Patch Plate washers10.500PARA0.500220%0.0000.000-1292.000

1070VCHP Reservoir Heaters10.250PARA0.250220%0.0000.000-1292.000

1080VCHP warm-up heaters10.250PARA0.250220%0.0000.000-1292.000

1090Thermistors and cables10.250PARA0.250220%0.0000.000-1292.000

1100FOSR Flim10.680PARA0.680220%0.0000.000-1292.000

1110Heater cables and ties10.910PARA0.910220%0.0000.000-1292.000

1120Connectors11.000PARA1.000220%0.0000.000-1292.000

1130Solid State Thermostats11.000PARA1.000220%0.0000.000-1292.000

1140Reservoir Tiebar Assy00.00000.00000%0.0000.0000.000

1150Reservoir Mount Interface21.441CALC2.882220%0.0000.000-2103.000

1160Excentric Bushing120.068CALC0.816220%0.0000.000-2103.000

1170No.6 CSK screw X 5/16 long480.001CALC0.043220%0.0000.000-2103.000

1180000.00000.00000%0.0000.0000.000

1190Panel Assy00.00000.00000%0.0000.0000.000

12003.1# Radiator Panel Core23.955CALC7.910220%0.0000.000-1292.000

12106.9# Radiator Panel Core20.591CALC1.182220%0.0000.000-1292.000

1220Outer Face Sheet211.423CALC22.846220%0.0000.000-1292.000

1230Inner Face Sheet25.705CALC11.410220%0.0000.000-1292.000

1240Potted Insert400.008CALC0.300220%0.0000.000-1292.000

1250Adhesive - Core to Face sheets21.555PARA3.109220%0.0000.000-1292.000

1260Adhesive - Core to Heat Pipes20.873PARA1.745220%0.0000.000-1292.000

1270Top notch stiffening bridge20.000CALC0.000125%0.0000.000-1292.000

1280Mount Interface Doublers80.111CALC0.888220%0.0000.000-1292.000

1290Mount Insulating Shim40.105CALC0.418220%0.0000.000-1292.000

1300Strut Bracket Doublers40.100CALC0.400220%0.0000.000-1292.000

1310000.00000.00000%0.0000.0000.000

1320Left Heat Pipe Assy00.00000.00000%0.0000.0000.000

1330Fill Tube/Cap60.001CALC0.009220%0.0000.000-1292.000

1340Contact Pad (evaporator)60.073CALC0.438220%0.0000.000-1292.000

1350Heat Pipe, Closed Frame60.445CALC2.670220%0.0000.000-1292.000

1360Heat Pipe Reservoir60.291CALC1.746220%0.0000.000-2103.000

1370Heat Pipe Bend80.005CALC0.040220%0.0000.000-1292.000

1380Connecting Leg20.015CALC0.030220%0.0000.000-1292.000

1390000.00000.00000%0.0000.0000.000

1400Right Heat Pipe Assy00.00000.00000%0.0000.0000.000

1410Fill Tube/Cap60.001CALC0.009220%0.0000.000-1292.000

1420Contact Pad (evaporator)60.073CALC0.436220%0.0000.000-1292.000

1430Heat Pipe, Closed Frame60.445CALC2.670220%0.0000.000-1292.000

1440Heat Pipe Reservoir60.291CALC1.746220%0.0000.000-2103.000

1450Heat Pipe Bend80.005CALC0.040220%0.0000.000-1292.000

1460Connecting Leg20.005CALC0.010220%0.0000.000-1292.000

1470000.00000.00000%0.0000.0000.000

1480.000-

1490.000-

1500.000-

1510.000-

1520.000-

1530.000-

Total Mass329.25720.98%0.0000.000-485.611





329.257100.0%

Grid Box:252.6880.0000.000-218.047

Radiators76.5690.0000.000-1368.613









requriements.





T&DF

Project PhasePre-CDRSubsystem :T&DFDate of lastest Update :07-Mar-02


1Tower Electronics Module, (TEM)162.678CALC42.848220%0.000.00-266.20Pre-PDR123Pre-PDRPARA

2Power Supplies163.200PARA51.200220%0.000.00-331.2000.350.250.03Pre-CDRCALC

3GlobaL Trigger, AEM, Signal Distribution Unit(GASU)114.000PARA14.000220%0.000.00-431.20500.30.20.03Pre-PRRMEAS

4Space Craft Interface Module, (SIU)112.500PARA12.500220%561.750.00-431.205000.250.150.01

5Power Dist. Unit, (PDU)13.950PARA3.950220%-561.750.00-431.2025000.220.120.005

6Event Processor Unit, (EPU)14.500PARA4.500220%-561.75-561.75-431.20Pre-CDR

7Event Processor Unit, (EPU)14.500PARA4.500220%561.75-561.75-431.2000.250.20.02

8Event Processor Unit, (EPU)14.500PARA4.500220%-561.75561.75-431.20500.20.150.02

9Empty Boxes11.945PARA1.945220%-187.25-561.75-431.205000.20.10.008

10Empty Boxes11.945PARA1.945220%187.25-561.75-431.2025000.150.10.006

11Empty Boxes11.945CALC1.945220%-187.25561.75-431.20Pre-PRR

12Empty Boxes11.945CALC1.945220%187.25561.75-431.2000.150.120.01

13Empty Boxes11.945CALC1.945220%561.75561.75-431.20500.10.10.01

14Hardware (lot)12.500PARA2.500220%0.000.00-331.205000.10.050.005

15Cables510.264PARA13.464220%0.000.00-331.2025000.10.050.005

16ACD External Cables240.390PARA9.360220%0.000.00-380.00

17ACD Internal Cables240.260PARA6.240220%0.000.00-380.00

18Cable trays and hardware (lot)120.000PARA20.000220%0.000.00-380.00Mass Estimation Method (PARA, CALC, or MEAS)Mass Estimation Method (PARA, CALC, or MEAS)Mass Estimation Method (PARA, CALC, or MEAS)

190.000-paracalcmeas

200.000-

210.000-

220.000-

230.000-

240.000-

250.000-

260.000-

270.000-

280.000-

290.000-

300.000-

310.000-

320.000-

330.000-

340.000-

350.000-

360.000-

Total Mass199.28720%16.90(7.20)(352.88)





199.287100.0%









requriements.





Pre-PDR History

GLAST LAT Instrument Mass (kg)Proposal9.2 cm SSD8.95 cm SSDSRR MassTKR GapJOG MassQ1-01 Rev

4-Nov-9920-Apr-001-Jun-0015-Sep-0028-Nov-0018-Jan-0126-Apr-01

TKR, CAL, ACD, Grid updated from Proposalnumbers. Uses Proposal reserveNew Instrument footprint, updatedmasses for TKR, CAL, GridMass shown at SRR, with new electronicsbox massIncreased tower pitch to 373.5 mmUpdated TKR dims and massNo change to Grid web thkUpdated CFC CAL dims, mass (29 Nov 00)Grid dims changed per CAL mod's (29 Nov 00)Thermal Blanket from Mech to ACD (18 Jan 01)Updated Grid, Radiators. New wall thk's.Updated CAL w/EM CsI crystal dimsNew ACD masses. Moved ACD elec to ACDShown at Apr Qtrly Review

LAT Totals2557.22616.22513.12572.32541.32521.22574.7

Tracker521.8541.2522.7522.7487.4487.4486.5

Thermal & Mechanical Structures191.4219.0212.8212.8199.3199.3195.4

Silicon detectors73.072.768.868.868.868.868.8

Lead Converters173.3171.4164.9164.9143.2143.2143.2

Electronics, Cabling, and Others84.178.176.376.376.176.179.1

Calorimeter1549.51563.81482.11482.11482.11462.91464.6

Mechanical Structures161.6173.9169.9169.9169.9145.8145.8

Cesium Iodide1338.31337.71260.91260.91260.91282.41282.4

Electronics & Cabling31.731.631.631.631.634.736.4

Others (wrapping, etc)18.020.519.719.719.70.00.0

ACD173.6173.0171.3171.3171.3198.9248.2

Tile Detector Assemblies84.6100.999.799.799.799.7105.8

Fibers, wrapping, foam spacers, etc14.5

Electronic Hardware23.821.021.021.021.021.051.6

Mechanical Hardware50.851.150.650.650.650.662.7

Thermal Hardware27.628.1

Mechanical Systems220.2217.2216.0216.0220.3191.6229.2

Grid Structure143.0113.6112.9112.9116.9116.5136.9

Heat Pipes and mounts50.028.328.328.328.328.36.4

Radiators (w/o mounts)46.846.846.846.846.886.0

Thermal Blankets27.328.528.028.028.3

Electronics92.0121.0121.0180.2180.2180.2146.2

TEM Modules32.032.032.074.674.674.674.6

SIU Modules15.015.015.013.613.613.613.6

ACD Modules5.034.034.034.034.034.0

Cable Plant40.040.040.039.539.539.539.5

SC ESN0.016.016.016.016.0

Others (cable ties, bolts, etc)0.02.62.62.62.6

OTHER0.00.00.00.00.00.00.0


Mechanical Systems Power BudgetNominal Operation 35 20.4Survival 220 152.0Operational Mode Power Allocation,W Estimate,W

Page Number


LAT Stay-Clear DrawingLAT-DS-00040-5Mech Systems Subsystem SpecLAT-SS-00115-2Subsystem ICDs

LAT Thermal Design ParamsLAT-TD-00224-3LAT Dissipated Power SummaryLAT-TD-00225-3Radiator Design SpecLAT-SS-00394-1Grid Box Design SpecLAT-SS-00775-1Thermal Control Sys. Perf. SpecLAT-SS-00715-1LAT Instrument Layout DwgLAT-DS-00038-3Top Flange Heat Pipe SCDLAT-DS-01393-1Subsystem IDDsLH/RH Down Spout Heat Pipe SCDLAT-DS-01392-1LAT-DS-01393-1Radiator IDDLAT-DS-01221-1LAT Perf SpecLAT-SP-00010-131 Aug 2000X-LAT Design SpecLAT-SS-001240-2X-LAT Plate SCDLAT-DS-01247-1Mid-Plate SCDLAT-DS-01257-1LAT Envir. SpecLAT-SS-00778-110 Feb 2003Requirements Flow-Down and Documentation Status

Page Number

Doc's. Dwg's

DocumentStatus

LAT-SS-00115-2: Mechanical Systems Subsystem SpecificationLevel III SpecificationRev 2 released, Rev 3 in work

LAT-SS-00xxx- 3: X-LAT Level IV SpecificationFinal draft out for review

LAT-SS-00394-1: Radiator Level IV SpecificationFinal draft out for review

LAT-SS-00715-1: Thermal Control System Performance SpecificationFirst draft out for review

LAT-SS-00775-1: Grid Box Level IV SpecificationFinal draft out for review

LAT-DS-01221-1: Radiator IDDRev 1 complete;out for review

LAT-DS-01247-1: X-LAT Plate Source Control DrawingRev 1 complete;out for review

LAT-DS-01257-1: Mid-Plate Source Control DrawingRev 1 complete;out for review

LAT-DS-01393-1: Top Flange Heat Pipe Source Control DrawingRev 1 complete; out for review

LAT-DS-01392-1: LH/RH Down Spout Heat Pipe Source Control DrawingRev 1 complete; out for review

&L&F&C&D &T&R&P of &N


Key Mechanical Systems Requirements (1of 2)8 Configuration 8.1. Mass The total mass of Mechanical Systems 1.89m 1.895 Y I IRD 3.2.2.3 When on, Radiator VCHP heater power < 35 W 20.4 14.6 Y D TD-00125-1(Derived) When off, orbit-average survival heater power 152.0 68(45%) Y D IRD 3.2.4.1.7.6 50 Hz 55.5 Hz 11% Y T IRD 3.2.2.8.1.2 8.6. Provisions for Integration and Test During Obs T-Vac, TCS capable of full functionality Ok Y T, A IRD 3.2.2.8.1.2 lying on its side387 W@ 35V(incl 30% Control margin)

Page Number


Key Mechanical Systems Requirements (2 of 2)9 LAT Alignment 9.1. Alignment Stability Maintain TKR alignments to < 7 arc-seconds,1 s radial, Y T, A MSS 3.3.1.11.1.2 Sect Requirement Design Margin Comply Method Req.Source Capable of withstanding static loads in thrust and lateral Ok Y A IRD 3.2.2.8.2 Capable of exposure to static launch loads Ok Y T, A IRD 3.2.2.8.210 Structural Load Environment Provide thermal control with LAT pointed 2pi/24/7/365 Y T, A MSS 3.3.2.3simultaneously Maximum process power indefinite dissipation Y T, A IRD 3.2.4.1.1(Derived)11.3. Environment Heat Loading and Orbital Parameters Capable of maintaining thermal control during exposure Y T, A IRD 3.2.3.5 Capable of normal operation when loaded by 75 W/Rad Y T, A IRD 3.2.3.4.5 From SC solar arrays4.1 arc-secPeak to-Peak2.9 arc-sec+ 5 sduring normal LAT operation10.1. Structural Loads11.1. Process and Interface Heat Loads11 Thermal Environment and Heat Loads 612W LAT+38W Rad @24 deg C73.4W/Rad0W/Rad5 degC calc+1 deg C operatingduring any normal LAT modeto IR, Albedo, Solar fluxes(Derived)

Page Number


Heat Pipe Performance RequirementsBased on:Results of Overall LAT Thermal Math Model

Verification MethodsA: AnalysisT: TestMargin is determined by: EP/ReqMust be > 1.3

Page Number

Sheet1

Heat Pipe/ ParameterReqMarginComplyVer. Method

Top Flange/ Transport9.2 W-m, 10 C>1.3YA, T

Downspout/ Transport7.6 W-m, 10 C>1.3YA, T

X-LAT/ Transport59.5 W-m, 10 C>1.3YA, T

VCHP/ Transport113.9 W-m, 10 C>1.3YA, T


Driving Design Requirements(Radiator: Mechanical)

Page Number

Radiator, Thermal

ParameterRequirementDesignMarginComplyVer. Method

Operational Temperature Limits-10 C to +25 CA, T

Temperature Stability+/- 7CA, T

Survival Temperature Limits-20 C to +30 CA, T

Reservoir Average Power, Normal Mode48 WA, T

Reservoir Peak Power, Normal ModeTBDTBDA, T

Anti-Freeze Average Power, Normal Mode0 W0 W0 WYA, T

Anti-Freeze Peak Power, Normal Mode0W0W0 WYA, T

Reservoir Average Power, Survival ModeTBDTBDA, T

Reservoir Peak Power, Survival ModeTBDTBDA, T

Anti-Freeze Average Power, Survival ModeTBDTBDA, T

Anti-Freeze Peak Power, Survival ModeTBDTBDA, T

Margin, Heater Sizing, Normal ModeDuty Cycle 30% margin on power to fully close VCHP'sTBD, no power allocationA, T

Margin, Heater Sizing, Survival Mode, Hot11C relative to max VCHP survival temperatureTBD, no power allocationA, T

&C&c

&C&c

Radiator, Structural


Mass86 kgI

Center of Gravity, Z-directionBetween 1038.5 mm (TBR) from datum and -Z edge720 mm from datum-318.5 mmN, (TBR)I

Center of Gravity, X- and Y-direction+/- 10 mm from location shown in ICDTBD, location not shownI, A

Stiffness> 50 HzT

Dynamic EnvelopeShown in ICDN, TBD Still working ICDA, T

Static LoadsSee Table 8 (TBR)A

Acoustic LoadsSee Table 9T

Shock LoadsSee Table 10A, Test at Obs. Level

Sinusoidal VibrationSee Table 11 (TBR)T

DepressurizationSee Figure 4Y (TBR)A

&C&c

&C&c

Radiator, Design


Mass86 kgxx kgx (x%)YI

Center of Gravity, Z-directionIn work797 mm from +Z edgeTBDY, TBD Still workingI

Center of Gravity, X- and Y-direction+/- 10 mm from location shown in ICD (Only X shown)Y: 25 mm from datum A X: 2.6 mmY: TBD X: 7.4 mmY: TBD, X: YI, A

Radiator Panel DimensionPer ICD2A18037 & 2A18038 Radiator Assy DwgLocally exceededN, TBD Still working ICDI

Radiator to LAT Mechanical InterfacesPer ICDcomplyY, TBD Still working ICDI

Radiator to S/C Mechanical InterfacePer ICDcomplyY, TBD Still working ICDI

Radiator to LAT Electrical InterfacesTBDTBDI

Radiator to S/C Electrical InterfacesTBDTBDI

Test OrientationMust function in 1-g when +X side is upCompliesN/AYT

Operational Life5 year5 year, min0+ yrYA

&C&c

&C&c

Sheet2

Sheet3


Driving Design Requirements(Radiator: Structural)

Page Number

Sheet1















Reservoir Heater Voltage RangeMeet all other perflormanc specs when voltage is 27 V to 29 VA, T

Anti-Freeze Heater Voltage RangeMeet all other perflormanc specs when voltage is 25 V to 35 V (TBR)A, T

Mass86 kgI



Stiffness> 50 Hz> 70 Hz+20 HzYA, (T?)

Dynamic EnvelopeShown in ICD 1.8 mm (Launch Loads) 3.2 mm (2mm misalign.)-2.2 mmN (TBD), working on ICDA, T

Static LoadsSee Table 8 (TBR)Gx = 5.1 g, Gy = 30 g, and Gz = 8.5 gCore Shear MSu = 0.02; Brckt Inserts MSu = 0.03; Heat Pipes MSy = 0.39Y (insert test TBD)A

Acoustic LoadsSee Table 9Included aboveLoads included in above marginsYA, T

Shock LoadsSee Table 10TBDTBDA, Test at Obs. Level

Sinusoidal VibrationSee Table 11 (TBR)Enveloped by aboveEnveloped by Static LoadsYA, T


Radiator Panel DimensionPer ICDN, TBD Still working ICDI

Radiator to LAT Mechanical InterfacesPer ICDY, TBD Still working ICDI

Radiator to S/C Mechanical InterfacePer ICDY, TBD Still working ICDI



Test OrientationMust be fully functional when +X side is up (in a 1-g environmentCompliesN/AYT

ReliabilityTBDTBDA

Operational Life5 yearA

RedundancyMust carry the loss of one like-componentRedunant Heaters/Thermistors. Sufficient HP marginN/AYI, A

VentingMust vent in the -Z and +/-X (TBR) directionY, TBRI

Cleanliness LevelTBDTBDI


Stiffness> 50 Hz> 60 Hz+10 HzYA, T

Dynamic EnvelopeShown in ICD 1.8 mm (Launch Loads) 3.2 mm (2mm misalign.)-2.2 mmN (TBD), working on ICDA, T

Static LoadsSee Table 8 (TBR)Gx = 5.1 g, Gy = 30 g, and Gz = 8.5 gCore Shear MSu = 0.02; Brckt Inserts MSu = 0.03; Heat Pipes MSy = 0.39Y (insert test TBD)A

Acoustic LoadsSee Table 9Included aboveLoads included in above marginsYA, T

Shock LoadsSee Table 10TBDTBDTBDA, Test at Obs. Level

Sinusoidal VibrationSee Table 11 (TBR)Enveloped by aboveEnveloped by Static LoadsYA, T

&C&c

&C&c

Sheet2

Sheet3


Driving Design Requirements(Radiator: Thermal)

Page Number

Radiator, Thermal


Operational Temperature Limits (RIT)-10 C to +15 C-5C to +10C+5/+5CYA, T

Temperature Stability (RIT)+/- 7C+/- 4C+/- 3CYA, T

Survival Temperature Limits-20 C to +30 C-20 C to TBD0C/TBDYA, T

Reservoir Average Power, Normal Mode48 W13 W35 WYA, T

Reservoir Peak Power, Normal ModeTBD48 WTBDTBDA, T



Reservoir Average Power, Survival ModeTBD42 W (27V)TBDTBDA, T

Reservoir Peak Power, Survival ModeTBD48 W (29V)TBDTBDA, T

Anti-Freeze Average Power, Survival ModeTBD91 WTBDTBDA, T

Anti-Freeze Peak Power, Survival ModeTBD232 W (35V)TBDTBDA, T

Survival Power draw from LAT155 W61 W94 WYA, T

Margin, Heater Sizing, Normal ModeDuty Cycle 30% margin on power to fully close VCHP's57%27%TBD, no power allocationA, T

VCHP Failure, Hot Operation+15C+14C+1 CYA, T

&C&c

&C&c



Mass86 kgI



Stiffness> 50 HzT







&C&c

&C&c

Radiator, Design







&C&c

&C&c

Radiator, Misc







&C&c

&C&c

Sheet2

Sheet3


Driving Design Requirements(X-LAT)

Page Number

Radiator, Thermal















Reservoir Heater Voltage RangeMeet all other perflormanc specs when voltage is 27 V to 29 VA, T

Anti-Freeze Heater Voltage RangeMeet all other perflormanc specs when voltage is 25 V to 35 V (TBR)A, T

&C&c

&C&c



Mass86 kgI



Stiffness> 50 HzT







&C&c

&C&c

Radiator, Design







&C&c

&C&c

Radiator, Misc


Test OrientationMust be fully functional when +X side is up (in a 1-g environmentCompliesN/AYT

ReliabilityTBDTBDA

Operational Life5 yearA

RedundancyMust carry the loss of one like-componentRedunant Heaters/Thermistors. Sufficient HP marginN/AYI, A

VentingMust vent in the -Z and +/-X (TBR) directionY, TBRI

Cleanliness LevelTBDTBDI

&C&c

&C&c

X-LAT, Thermal


Operational Temperature Limits-20 C to +30 C (TBR)N, TBRA, T

Power DissipationMeet temperature requirements with heat load of 50 W (TBR) per boxN, TBRA, T

Heat Transport Capability75.7 W (TBR) per HPA, T

&C&c

&C&c

X-LAT, Structural


MassTBD41 kgTBDTBD, not in most recent draft SCDI

Center of GravityTBDTBDTBD, not in most recent draft SCDI

Stiffness> 50 HzY, TBD Constraints not providedT

Dynamic EnvelopeTBDTBDTBDA, T

Static LoadsSee Table IV (TBR)A

Acoustic LoadsSee Table VT

Sinusoidal VibrationSee Table VIT

Random VibrationSee Table VIIT

Shock LoadsSee Table VIIIT

&C&c

&C&c

X-LAT, Design


Panel DimensionsPer SCDPer 2A15712 and 2A15716N/AYI

X-LAT to LAT Mechanical InterfacesPer SCDN/AYI

Mass 50 Hz97.7 Hz47.7 HzYT,A

Dynamic EnvelopeTBDTBDTBDTBDA, T

Static LoadsSee Table IV (TBR)Per 2A15712 and 2A15716>1.68TBD pending payload analysisA

Acoustic LoadsSee Table V>1.68YA,T

Sinusoidal VibrationSee Table VI>1.68TBD pending payload analysisA,T

Operational Temperature-20C to +35 C (TBR) at 286.2 W min or 359.9 W max-5 C/+24.2 C>11CYA,T

Test OrientationMust function in 1-g when +X side is upCompliesN/AYT

Operational Life5 year5 year, min0+ yrYA

&C&c

&C&c

Sheet2

Sheet3


DesignGrid Box Assembly

Section 13.3

Page Number


Drawing Tree

Page Number

NameTitle

NameTitle

NameTitle

NameTitle

NameTitle

NameTitle

Team Title

Name

Company Name

Company NameDepartment Name

Mechanical Systems Drawing Tree

LH & RH Radiator Mount Bracket

LH & RH Down Spout Heat Pipe

Grid Box Assy

Grid Box Base Assy

Grid Assy

X-LAT Plate Assy

LH & RH Heat Pipe Patch Panel

Mid-Plate Assy

4 x 4 Grid

EMI Shield Details(4 drawings)

Top Flange Heat Pipe

Purge Groove Cap

Spacecraft Interface Stiffener (Wing)

Thermistors

M = MakeB = BuySCD = Source Control Drawing

B

Flight Heaters

TCS External Box

Connector Panel

External Box Base

NOTES:1. Grid Box Assy is for Mechanical Systems Testing only.2. Grid Box Base Assy is delivered to I&T for LAT integration along with all of the uninstalled Grid Box Assy parts.3. Wing may become integral part of 4x4 Grid.

SCD

External Box Cover

SCD

1

2

SCD

M

M

M

M

Grid Schematic

TCS Connector Support Bracket

SCD

SCD

SCD

SCD

3

Mechanical Systems Test Configurations

Static Load TestGrid Box Assy

Thermal CycleGrid Box Assy

Grid Box Assy

Mech Systems Thermal Balance Test

Load FixturesSTE

Strain GagesSTE

STE = Special Test EquipmentGSE = Ground Support EquipmentM = MakeB = Buy

M

E-Box SimulatorsGSE

Test HeatersSTE

Radiator Assy

MLI BlanketsSTE?

X-LAT Plate Assy

Mid-Plate Assy

LAT Mass SimulatorGSE

ThermocouplesSTE

Thermal Control SystemGSE

Grid Box Assy

B

B

B

B

M

M

M

M

M

M

M

M

Dummy CAL Base-platesGSE


Grid Box Assembly DesignHeat Pipe Patch PanelS/C Mount InterfaceMid-Plate X-LAT Plate AssyRadiator Mount BracketEMI ShieldsCAL-Grid Interface

Page Number


GridDesign DriversProvides structural backbone for all LAT SubsystemsProvides electrical ground for all LAT SubsystemsProvides thermal path to Radiators for all LAT Subsystems except Electronics boxes (carried by X-LAT plates)Embedded Heat Pipes in top flange of Grid to move heat outDownspout Heat pipes tie Grid to RadiatorsThermostatically controlled heaters on Grid corners are part of LAT thermal control systemConstructionMachined from 10 thick 6061 AL plateHeat treated to T6 after rough machiningGrid surface is alodine, class 3. Electrically conductive and good surface for adhesive bonding thermal components, harness supports, Tracker cables, MLI supports, EMI tape etcIntegral purge grooves allow for N2 purging of the CALs during ground operations

Page Number


Grid StructureHelicoils for CAL boltsTop Flange Heat PipesPurge grooves

Page Number


Calorimeter to Grid InterfaceThis interface is part of the Grid stiffness design.Interleaved CAL baseplate tabs are bolted to Z surface of GridCAL baseplates close-out the Grid structure which increases natural frequency of LATBolted interface applies clamping force over large area (~4223 mm2 per CAL) to develop shear load capability2 pins per Grid bay locate CAL and are used to locate hole pattern in Grid and other features such as Tracker cable cut-outs in Grid walls

Perimeter backing bars engage the outer tabs of the outer CALs to double the clamping force on these highly loaded tabs

Page Number


X-LAT Plate to E-Box Thermal JointThermal joint design drivers Carry thermal load of stack of E-Boxes into X-LAT Heat PipesAccommodate tolerance stack up E-Box and Grid Box partsBe repeatable & reliableMinimize schedule & verification impacts due to removal of X-LAT plates for access to Electronics Vel-therm gasket material selectedHighly conductive graphite fibersMechanically compliantMeets out-gassing requirement

Page Number


Electronics Stack Cross-SectionNote: View along Y-axis4 cm wide Vel-Therm strip placed around perimeter of each box optimizes conduction vs contact pressure required

Page Number


EMI ShieldDesign DriversEncloses LAT Electronics boxes (EMI tight)Consists of 4 Radiator Mount Brackets, 4 Heat Pipe Patch Panels, 4 X-side Shields and 4 center ShieldsMechanically supports 3 way heat pipe joint Downspout, X-LAT and Radiator HPsSupports X-LAT platesProvides mounting for Connecter Patch Plates from ElectronicsProvides for venting of enclosureConstruction6061-T6 AL machining, alodine Pieces bolted to Grid & each other

Page Number


Radiator Mount BracketDesign DriversSupports & locates Radiators & their Heat PipesSupports & locates X-Lat Plates & their Heat PipesProvides access to ACD mounting boltsSupports & locates alignment opticProvisions for mounting Heater Control Box or Heater Control Connector Bracket for Thermal Control SystemCorner lugs for MGSE attachment (sized to carry entire Observatory mass with 2 lugs if required)Construction6061-T6 Al machining, alodineBolts to 3 orthogonal surfaces of Grid corner

Page Number


Spacecraft Interface Stiffener (Wing)

Design DriversPrimary function is to spread the point load inputs from the Spacecraft & locally stiffen the Grid against the lateral loads.Distortions in this area drive the CAL-Grid interface designDefines Spacecraft interface to LAT (bolted pinned joint)Construction6061-T6 machining, alodineBolted, pinned & keyed to Grid+Z

Page Number


Work to Close Out Structural DesignCAL-Grid interface under review with GSFCFinalize design of perimeter backing plateInvestigating making the Spacecraft Interface (Wing) an integral part of the GridFinalizing details of Spacecraft mounting w/ SpectrumMass & stress optimization of EMI shields and Radiator mount bracketsRadiator mount bracket X axis compliance requirement for differential contraction of Radiators & GridAwaiting results of LM thermal analysisFinalize design implementation of Vel-therm joint

Page Number


Stress AnalysisTopicsCal-Grid interface load recoveryGrid Stress analysisRadiator Mount Bracket analysisSummary and Closure Plan

Page Number


CAL Interface Load RecoveryCAL-Grid bolted friction joint1152 screws (72 per CAL module)Joint allows CAL bottom plate to stiffen LAT by closing out bottom side of GridLoad recoveryInterface loads are backed out from the FEA model by resolving nodal forces at the interface into shear and normal loads at the bolt locationsRequired friction coefficients are generated, given a set screw preload and a perimeter backing stripEM bolted joint tests are underway to validate friction coefficient and joint behavior

Histogram Showing Required Friction CoefficientsQual Friction Coefficients for CAL-Grid Joint

Page Number

Sheet1

Bolt Sizeno. 8no. 6

MuMu

4.1g Z + 5.1 g Xlat9ol40.510.57

6.8 g Zlat9ol70.310.23

Max Interface Qual Friction Coeff0.510.57

Chart6

747576

281496

9174

286

20

30

Lift-Off/ Airloads

MECO

Required friction coefficient for no interface motion at screw location

Number of screws

Predicted friction requirements

lat9ol4po2ab.out

-----------------------------------------------------------------------Sorted Mu's

0.974Mu# half tabs requiring Mu

Results for1.25 X (4.1 g inz + 5.1g inx), preload =1573 lbf0.9650-.1660

forthe no.8 screws, 1080 lbf forthe no. 6 screws, using grid0.7040-.2322

elements incoarse-mesh model withstepped, all-brick-elementCAL0.6360-.3110

plates; SCmount bc's on bottom ofwing;tabless, crudely pointed,0.6170-.434

short wingswith noslots, fully bonded to underside ofGrid;0.6110-.57

corner tabsscalloped; no added clampingforce on perimeter tabs:0.6070-.612

0.5890-.74

-----------------------------------------------------------------------0.5870-.81

0.580-.90

V = sqrt(fx**2 +fy**2)0.5780-1.02

0.572

F_separation (lb) = fz +FdueMx0.566

0.56Muno. locations with no. 6 screw where Mu is required

Friction Coefficient = V/(preload - fz)0.5550-.1116

0.5410-.278

-----------------------------------------------------------------------0.5170-.336

0.5060-.415

bolt#x(mm)y(mm)fx(lb)fy(lb)V(lb)fz(lb)FdueMxFsepaFricCoe0.5040-.55

0.4570-.63

00000000000.4440-.70

00000000000.4340-.81

3-749-721.5580-47.392.9-64.911.6-53.30.0570.4290-.90

4-749-712.380107.1133.787.217.2104.40.090.4250-1.02

00000000000.413

00000000000.408

7-749-684.3114.1-76.8137.5-56107.251.20.1210.393Sorted Mu's for locations with no.6 screws:

8-749-674.55114.1119164.9119.2101.9221.20.1720.3870.974

00000000000.3820.965

00000000000.3760.704

11-749-634.875122.6-111.1165.5-53.9192138.10.1020.3660.566

12-749-625.125122.6133.2181.1127.7174.6302.40.1250.3650.517

00000000000.3650.504

00000000000.3640.457

15-749-595.875125.4-128.3179.4-65.2221.2156.10.110.3580.434

16-749-586.125125.4142.7190139.7219.2358.80.1330.3580.429

00000000000.3550.425

00000000000.3530.408

19-749-556.875136.9-163.2213-61.4271.1209.70.130.3420.393

20-749-547.125136.9163.5213.3144.2253.4397.50.1490.3420.387

00000000000.340.382

00000000000.3370.376

23-749-517.875154.7-167.1227.8-74.6265.4190.70.1380.3310.366

24-749-508.125154.7190.3245.3155.9244.3400.20.1730.3290.364

00000000000.3290.358

00000000000.3280.358

27-749-478.875173.5-178.9249.2-81.2268.6187.40.2150.3230.342

28-749-469.125173.5217.8278.5167.8221.4389.20.3050.3220.34

00000000000.3210.331

00000000000.3180.322

31-749-429.7198.1-162.4256.2-76.1198.5122.40.1550.3160.307

32-749-420.45198.1197.7279.9146.1142.3288.40.1960.3120.305

00000000000.3110.305

00000000000.3110.29

35-749-392.7149.1-136.5202.2-89.225.7-63.50.1220.3090.289

36-749-383.45149.1258.4298.382.553.1135.60.20.3070.286

00000000000.3070.282

00000000000.3050.281

39-749-347.05100.5-132.9166.6-84.2125.341.20.1010.3050.281

40-749-337.8100.5100.4142121.3136.1257.40.0980.3020.28

00000000000.2990.279

00000000000.2940.271

43-749-309.8150.9-103.9183.2-66.8224.9158.10.160.2910.264

44-749-300.05150.9157.4218159.3201.2360.60.2370.290.262

00000000000.2890.259

00000000000.2890.257

47-749-260.375159.4-138.1210.9-65.7270.5204.80.1290.2860.256

48-749-250.625159.4187.5246.1154.3223.1377.40.1730.2860.251

00000000000.2850.247

00000000000.2850.247

51-749-221.375165.6-150.9224.1-89.9264174.10.1350.2850.246

52-749-211.625165.6222.7277.6172.3235407.30.1980.2830.241

00000000000.2820.237

00000000000.2820.233

55-749-182.375174.6-154.9233.4-90.2255.1164.90.140.2810.231

56-749-172.625174.6278.3328.6172.3214.6386.90.2350.2810.231

00000000000.280.223

00000000000.2790.22

59-749-143.375179.5-103.2207-97.4213.7116.30.1240.2770.22

60-749-133.625179.5335.8380.8182.8178.5361.30.2740.2750.215

00000000000.2740.211

00000000000.2730.21

63-749-104.375147.3-3.4147.4-62.5178.9116.30.1290.2710.207

64-749-94.625147.3367.4395.81691493180.4340.2710.204

00000000000.270.204

00000000000.2690.204

67-749-55.271.4153.8169.514.947.262.10.1090.2690.203

68-749-45.9571.4310.1318.278.416.895.20.2130.2670.2

00000000000.2650.2

00000000000.2640.199

71-749-18.24252.3252.347.8145.11930.1650.2630.198

72-749-8.954115.2115.2-46.7164.71180.0710.2620.198

00000000000.260.198

00000000000.2590.197

75-74927.45-26.3297.5298.638.4106.2144.50.1950.2580.195

76-74936.7-26.3200.320239.967.8107.70.1320.2580.194

00000000000.2570.194

00000000000.2570.194

79-74964.7-125.6303.4328.4114.489.5203.90.340.2560.19

80-74974.45-125.6105.7164.2-12.7146.2133.60.150.2560.19

00000000000.2520.189

00000000000.2520.188

83-749114.125-174.8364.8404.5183.3162345.30.2910.2510.181

84-749123.875-174.8-58.6184.4-84.2200.5116.40.1110.2510.178

00000000000.2510.177

00000000000.2490.175

87-749153.125-177.9303.5351.8175.9196.5372.40.2520.2470.174

88-749162.875-177.9-129.1219.8-94.4229.1134.70.1320.2470.173

00000000000.2460.172

00000000000.2460.172

91-749192.125-167250.2300.8166.5225.3391.90.2140.2440.172

92-749201.875-167-150.8225-81.5264.9183.40.1360.2440.171

00000000000.2430.171

00000000000.2420.17

95-749231.125-154206.5257.6157.2216.1373.30.1820.2410.169

96-749240.875-154-142.9210.1-83.1233.3150.20.1270.2410.169

00000000000.2410.168

00000000000.2410.164

99-749270.125-159.1160.3225.8163.8239.8403.60.2460.240.162

100-749279.875-159.1-110.1193.5-70.9241.7170.70.1680.2380.161

00000000000.2370.16

00000000000.2370.156

103-749319.3-138.4137.2194.8159.3174.8334.10.1380.2370.151

104-749328.55-138.4-98.4169.8-71.7181.7110.10.1030.2350.151

00000000000.2350.15

00000000000.2340.145

107-749356.3-42.10.242.146.578124.40.0280.2330.143

108-749365.55-42.1-125.6132.5-82.645-37.60.080.2330.143

00000000000.2330.142

00000000000.2310.141

111-749401.95-167.5191.7254.684.248.8132.90.1710.2310.14

112-749411.2-167.5-146.2222.4-63.5120.5570.1360.2310.14

00000000000.2310.139

00000000000.2290.135

115-749439.2-194181.1265.4161.2202.5363.80.2890.2280.134

116-749448.95-194-121.5228.9-75.4223.1147.60.1980.2280.133

00000000000.2270.132

00000000000.2260.131

119-749488.625-165.1180.4244.6166.9257.7424.50.1740.2250.129t

120-749498.375-165.1-157.7228.3-79.9260.91810.1380.2250.127

00000000000.2230.127

00000000000.220.126

123-749527.625-143.6166.9220.2150.8256.6407.30.1550.220.124

124-749537.375-143.6-157.5213.2-69.1258.9189.80.130.2190.123

00000000000.2180.121

00000000000.2160.119

127-749566.625-127.1143.9192137.9250.2388.10.1340.2160.118

128-749576.375-127.1-138.1187.7-56.4245.8189.30.1150.2150.118

00000000000.2140.115

00000000000.2140.114

131-749605.625-116.4136.2179.1130.1199.3329.40.1240.2130.113

132-749615.375-116.4-120167.2-62.2194.7132.50.1020.2130.112

00000000000.2110.112

00000000000.2110.111

135-749644.625-122.1117169.1129.3158.1287.40.1780.210.11

136-749654.375-122.1-85.2148.9-59.6147.587.90.1310.210.11

0

Documents

GLAST Large Area Telescope: Mechanical Systems WBS: 4.1.8 Section 13 Marc Campell SLAC