TMT M1 Segment Support Assembly (SSA) Preliminary Design Review (PDR) Volume-1: OVERVIEW

TMT.OPT.PRE.07.056.REL01 HPS-280001-0105 – Volume 1 – October 24-25 2007 – Slide 1

TMT M1 Segment Support Assembly (SSA) Preliminary Design Review (PDR)

Volume-1: OVERVIEW

Pasadena, CaliforniaOctober 24-25, 2007

Contributors to the development effort:from IMTEC

RJ Ponchione, Eric Ponslet, Shahriar Setoodeh, Vince Stephens, Alan Tubb, Eric Williams

from the TMT ProjectGeorge Angeli, Curt Baffes, Doug MacMynowski, Terry Mast, Jerry Nelson, Ben

Platt, Lennon Rodgers, Mark Sirota, Gary Sanders, Larry Stepp, Kei Szeto

TMT ConfidentialThe Information herein contains Cost Estimates and Business Strategies Proprietary to the TMT Project and may be

used by the recipient only for the purpose of performing a confidential internal review of the TMT Construction Proposal. Disclosure outside of the TMT Project and its External Advisory Panel is subject to the prior written approval

of the TMT Project Manager.

* Note: HYTEC, Inc. merged with IMTEC Inc. in March 2007.


OutlineVolume-1: Overview

– Thirty Meter Telescope Overview– SSA Project Overview– Key Design Requirements– Design Concept– SSA Preliminary Design

Key Subsystems– Axial Support– Lateral Support– Tower, Guide Flexure, Locks, Registration– Warping Harness– Subcell

Volume-2: System Level Calculations– M1 Segmentation – Segmentation Correction (for Variable Segment Geometry)– Budgets:

Installation & Alignment

Edge Gap

Actuator Stroke

Mass


OutlineVolume-3: System-Level Finite Element Analysis

– Model Description– Optical Performance– Stiffness and Modes– Buckling– Sensitivity Analyses– Stress Analysis– Backup Slides

Volume-4: Warping Harness Design and Analysis– Fundamental Approach & Architecture– Warping Harness Requirements

Opto-mechanicalMechanical

– Design Concept– Performance Analysis

Actuator arrangementSurface correction

– Derived Requirements for Components– Mechanical & Electrical Design– Quantization Error Estimate


OutlineVolume-5: Flexure Design and Analysis

– Design Load Combinations– Central Diaphragm– Rod-Type Flexures– Lateral Guide Flexure

Volume-6: Subcell Integration & Segment Handling– Subcell Integration & Alignment

Fixed Frame InstallationDummy MassSubcell Alignment

– Segment Lifting Jack & Lifting TalonJack design Lifting Talon design

Volume-7: Summary and Future Plans– Prototype Testing

Test Plans– Component testing– Full Prototype testing

– Schedule– Summary

Where we are and where we’re goingTechnical Risks

– Conclusions


BRIEF TELESCOPE OVERVIEW

Thirty Meter Telescope


M1 Array30m Diameter

~60m ROC

492 Segments– 1.44m x 45mm1

Note 1) 45mm for Glass-Ceramic, 50mm for Fused Silica

PSA On Mirror Cell


Segment SizeNominal Segment size is 1.44 m across vertices

– Limited by blank size to maintain several competitive suppliers

Thickness:– 45 mm if glass ceramic– 50 mm if fused silica (ULE)

Aperture limits:– Outermost corners: 15.0 m radius– Innermost corners: 1.45 m radius

1.44

15.0

1.45

30m diameter


M1 ParametersFundamental M1 Parameters:– Constant-gap segmentation:

82 different segment shapes

Six identical sectors

– Nominal segment:1.44m regular hexagonal meniscus

Glass-Ceramic, 45mm thick

60m paraxial radius of curvature– Neglect asphericity in support design

activities

– Average segment ROC ~62.5m

Assume worst case CTE = -0.05 ppm/°C in analyses

– Alternate segment:Fused Silica, 50mm thick meniscus

SSA can be re-tuned to accommodate

XPSA

YPSA

ZPSA

YPSA

ZPSA

XPSA

ZPSA

YPSA

XPSA

SSA Base

Cell Truss

1.44 m

45 mm


M1 ParametersSegmentation Pattern:

Sector Boundary - Note Fixed Frame Clocking

60◦

View from Sky


SSA PROJECT OVERVIEW

Thirty Meter Telescope


SSA Project ScopeIMTEC Design/Development Responsibilities Include:– Segment Support Assembly (SSA)

– Segment Lifting Jack

– Segment Lifting TalonAttaches Mounted Segment Assembly (MSA) to Segment Handling Crane

– Subcell Integration Hardware:Mass Simulator

Surveying Target Holders

Subcell Alignment Tooling

– Release Prototype Drawings

– Build, Test and Deliver Prototypes

– Refine design for productionPropagate design to 82 versions (segmentation effects)


SSA Overview

Polished Mirror Assembly (PMA)

PolishedMirror

SegmentCentral Diaphragm (1 ea.)Moving Assembly (1 ea.)

--Whiffletrees (3 ea)--Moving Frame Assembly (1 ea)--Warping Harness Actuators (21 ea)--Lateral Guide Flexure (1 ea)--Tower Assembly (1 ea)--Lock Assemblies (3 ea)--Sheet Flexures (6 ea)

Electrical Bulkhead Panel Assembly

PRIMARY SEGMENT ASSEMBLY (PSA)

Segment Support

Fixed Frame Assembly (1 ea)

Adjustable Alignment Positioners (AAPs, 3 ea)

Actuator Flexure (3 ea)

Subcell

IMTEC Responsibility

IMTEC Responsibility

Comprises the SSARemoved for Re-coating

Mounted Segment Assembly (MSA)

Edge Sensors1

(6-drive, 6-sense)

Cables & Connectors for Sensor1 & WH

Optical Coating

Actuator1

1) In WBS, Actuator is part of the M1CS not M1Optics

Produced at Optics Shop


Primary Segment Assembly (PSA)Polished Mirror SegmentAdd Optical Coating, Edge Sensors, Sensor & WH Cabling & Connectors

Mounted Segment Assembly (MSA)Add Segment SupportPolished Mirror Assembly (PMA)Include Subcell + ActuatorsPSA ATTACHED TO MIRROR CELL

SSA Overview


SSA Overview

SEGMENT SUPPORT ASSEMBLY (SSA)


KEY DESIGN REQUIREMENTS

Requirements


Key Requirements (1/4)SSA-Induced Surface Errors:– Goal: Minimize gravity and thermal distortion while controlling cost– Optical performance of SSA evaluated by system level PSS analysis

Performed by Project and JPL using IMTEC unit case predictions as inputs– When complete, analysis to consider all SSA distortion effects:

Gravity, Thermal Distortion, Thermal Clocking, Polishing, Mfg, + …

Assumptions:– Observing segment-zenith angle: -15° to +80° → max Δς = 80°

0° to 65° telescope Zenith ± 15° from M1 curvature– Observing temperature: 9°C (TSITE) ± 4°C

Based on Armazones site testing data (80% of observing time within +/-4C)

Alignment & Phasing System (APS) + Warping Harness used regularly to null DC errors

- Seasonal mean temperature offset, Tmean

- Difference between optics shop figuring temp and Tref

Single Support-System design, customized for each segment type:– Accommodate shape variations from M1 segmentation (up to 0.5%)

No backlash or stick-slip:– Flexure-based mechanisms


Key Requirements (2/4)Accommodate ± 2.5mm actuator stroke: – SSA hard stops nominally at ±3.0mm– Survive full differential tip/tilt

Remote-controlled warping harness:– Control 2nd and 3rd order Zernikes:

Correction capability: 200 to 2100 nm P-V (38 to 410 nm RMS)Improvement ratio (RMS before correction / RMS after correction)

– > 15 on 2nd order terms: focus & astigmatism– > 5 on 3rd order terms: coma & trefoil

– Periodic Adjustment:Capability to readjust up to 10 times per night (~1/hour), if necessary

Power dissipation <2 Watts/segment– Includes all segment heat sources (Actuators, sensors, electronics, etc.)

50 years lifetime; high reliability:– Only significant wear items are warping harness moment actuators

6-DOF adjustable Subcell & repeatable registration system:– Correct for Mirror Cell tolerances ( ± 5 mm adjustment range, set-and-forget)– Removal/replacement of SSA with ± 50 μm repeatability


Key Requirements (3/4)SSA mass < 90 kg (moving mass < 45 kg)– Not including actuators, segment, edge sensors & cables for edge sensors

– Ref: Segment mass ~153 kg for glass ceramic

Static stiffness > 12 N/μm, piston:– Assuming rigid actuator & mirror cell

Natural frequencies of PSA > 35 Hz with 10N/m actuator stiffness:– Avoid rotating machinery disturbances at ~25 and ~30 Hz

50 or 60 Hz AC power grids possible

– Permit higher actuator control bandwidth

– EXCEPT:Torsional modes permitted to be <35 Hz

– Unlikely to be excited on telescope

– fn >8 Hz required for static stiffness

Environments:– Operating conditions such as temperatures, g-levels, etc

summary slide to follow


Key Requirements (4/4)MSA shall be compatible with Coating Chamber requirements TBC:– Cleanliness, Outgassing and Coating process compatibility

SSA design shall be designed for manufacture– 492 units + Spares allows for economies of scale if the design is sound

Maintainability and Servicing considerations– Segment exchanges are frequent and must be straightforward

Recoating every 2 years implies 5 segment exchanges per week on average

Cost control is fundamental to the design– Cost of manufacture and test

– Cost of ownershipReliability

Maintainability


Environments

1. About any axis in local x-ySSA plane2. In local zSSA direction (piston)3. SSA on telescope4. Scaled up from 1.2m segment loads by a2

5. Scaled up from 1.2m segment loads by a3

6. All dynamic loads treated as quasi-static. 1g dead weight not additional

Quantity Observing3 Non-obs.3 Survival3 Handling Transport Recoating

Segment Zenith angle1 (+Z to vert.)

0 to 80° 0 to 105° 0 to 105° 0 to 135° 0 to 135° 180°

Temp. and rate of change

0 ± 5°C

± 3°C/hr

-15 to 35°C -20 to 40°C -20 to 50°C -20 to 50°C ≤ 50 °C

Humidity 0 to 95% 0 to 100% 0 to 100% condensing

0 to 100% condensing

0 to 100% condensing

-

Wind force2 4.18N RMS

TBC4

4.18N RMS

TBC4

8.35N RMS

TBC4

8.35N RMS

TBC4

- -

Wind moment1 1.44Nm RMS

TBC5

1.44Nm RMS TBC5

2.88Nm RMS TBC5

2.88Nm RMS TBC5

- -

Quasi-static load6 1g 1.4g 3.0g, any axis

TBC

3.0g, any axis

TBC

10g, any axis

TBC

-

Altitude 2000-5000m 0-5000m 0-5000m 0-10000m 0-10000m 0-5000m

Tracking and slewing rates

El <0.039°/s

Az <2.26°/s

TBD TBD - - -

Tracking and slewing accel.

El <.00015°/s2

Az <.00880°/s2

TBD El <2.0°/s2

Az <2.0°/s2

TBC

- - -


DESIGN CONCEPT

SSA Design


Key Functions of SSASupport segment with minimum distortion (observation mode):

– Relative to reference state (as figured) ςSEG = 0°, TREF

Ability to position segment in 3 DOFs (piston, tip, tilt):– Continuous, active positioning by three linear actuators

Ability to alter surface shape to correct for figuring errors and other effects:– Occasional correction

Interface with Mirror CellProvide means to align SSA in 6 DOFs:

– Compensate for mirror cell fabrication tolerances (+/- 5mm any direction TBC]– One-time adjustment during telescope integration

Ability to remove and replace MSA with specified repeatability:– Quick replacement of segments without re-alignment of Subcell

Accommodate irregular/variable size segments with single support design:– Uniform gaps lead to irregular and/or variable size hexagons

Provide means to extract segment out of M1 array for re-coating/maintenance:

– Lifting jack – Segment Lifting Talon

Interface with segment removal crane


Diaphragm

Moving Frame

3 ea WhiffletreeGuide Flexure

Tower

Polished Mirror Segment

Axial Support Rod Flexures

Warping Harness Actuators, 21ea

Edge Sensors (12)

Mounted Segment Assembly (MSA)

Final FiguringCam Locks

(3ea)

Design Concept

Note: Does not represent assembly sequence


3ea Actuators

3ea Adjustable Alignment Positioners (AAPs)

Fixed Frame

Mirror Cell

SUBCELL+ACTUATORS

Design Concept

ActuatorOutput Shaft

Actuatorflexure


MSA Placed on JackSegment Lifting Jack

Design Concept

Lifting Talon


MSA Attached to Subcell

Actuator FlexureClamped to

Moving Frame (3 places)

Design Concept


3ea Actuators

3ea Adjustable Cell Interface

Fixed FrameMirror Cell

Diaphragm3 ea WhiffletreeGuide Flexure

Mirror Segment

Axial Support Rod Flexures

Warping Harness Actuators, 21ea

Moving Frame

Tower

Cam Locks Released

PSA Operational Configuration

Design Concept

MSA hold-down bolts


PRELIMINARY DESIGN

SSA Design


Design StatusSegmentation scheme has been chosen:– Scaling rule selected to minimize blank diameter

We have a detailed 1.44m Preliminary Design:– 27-point mechanical whiffletree axial support

– Central diaphragm lateral support

– 21-actuator/segment, whiffletree-based warping harness

– Correction for segment shape variations via custom WT joint locations

– Repeatable interface, Subcell alignment, and actuator attachment

Extensive, coupled performance modeling has been performed:– Complete FEA revision to reflect Preliminary Design is complete

Design satisfies nearly all requirements

Completing final changes required for Prototype SSA fabrication

Hardware designs being detailed:– Detailed drawings for prototype in process


Current PSA DesignPSA attached to mirror cell:

Mirror Cell

Actuator


Flexures Bonded to Segment

Segment

Axial flexure assemblies27 ea. bonded to segment

Edge Sensor12 ea.

Central Diaphragm(bonded to segment)

Alignment ArrowPoints to center of M1



Small Whiffletree Triangles Attached

Small whiffletree triangle - 3 inner - 6 outer



Large Whiffletree Triangles Attached

Large whiffletree triangle



Sheet Flexures Added

Sheet flexure, 6eaIn-plane connection between Whiffletree

Triangles and Moving Frame



Moving Frame Attached

Moving frameSheet flexure, 6eaIn-plane connection between Whiffletree

Triangles and Moving Frame

V-Groove for lifting, 3 ea.



Warping Harness Added

Warping harness actuator

Warping harness leaf-spring



Tower & Locks Installed

Tower Assemblywith Repeatable Interface

Electrical Connector Bulkhead Panel



Fixed Frame Included

Fixed FrameNote: Does not represent assembly sequence


Installed on Mirror Cell

Adjustable Alignment Positioner (AAP)

Mirror Cell

Actuator

Actuator flexure



Sector Boundary

Sector-F

Sector-A

PSA’s Clocked 60 degrees between sectors– Two fixed frame versions

– Sufficient clearance at boundary

Adjacent actuators35mm nominal clearance


Group of SegmentsView of Seven Adjacent Segments – Top View


Group of SegmentsView of Seven Adjacent Segments – Bottom View


AXIAL SUPPORT SYSTEM

SSA Design


Axial Support SystemTwo level, 27-point whiffletree system– All-Aluminum design (nearly)

Triangles and sheet flexures Aluminum

Rod Flexures Stainless Steel

Analysis shows high CTE of Aluminum to be acceptable

Lower machining costs and corrosion resistance a plus

– Triangles nested for compactness

Rod Flexures at pivot locations

Pivot Flexures at Moving Frame Connection

Mirror SupportRod Flexures


Axial Support SystemWhiffletrees Ride on Moving Frame– Moving Frame: 6061 Aluminum weldment

ActuatorRod Flexure

ClampHandling Feature

PivotFlexure


Axial Support SystemSheet Flexures:– Concept introduced by SALT

– Stabilize whiffletrees in XYSSA plane

Pivots (Kz) + Sheet Flexures (Kx, Ky, Rz) provide 4 Degrees of Stiffness

– Tip/Tilt (Rx & Ry) remain compliant

– Whiffletree mass is nominally balanced about sheet flexure plane

– Aluminum 7075-T651, 0.508mm (0.020”) thick

Sheet Flexures2 per WT

Pivots3 per WT

Sheet Flexure Attachment to Moving Frame, TypicalNo further discussion of Sheet Flexures

Questions?


Axial Support System27-Mirror support rod flexures– Invar pucks bonded to mirror using

3M EA-2216 EpoxyWell characterized adhesive

JPL heritage for Invar/Zerodur bonds (documented process )

0.250mm nominal bondline (0.010”)

– Stainless Steel rods connect pucks to triangles

304V Cold drawn 94% CW

250 ksi yield strength

– Threaded end connections:Stiff, strong, adjustable & removable

VentHole

VentHole

Mirror

Small WTTriangle

InvarPuck

Flexure:2.1mm OD x 143mm Long

Bondline

Detailed discussion: PDR Volume-5


Axial Support System9-Small whiffletree triangles – Extruded Aluminum: 6061 T6

– Low cost~$12 per extruded blank, in production qty.

3-Large load-spreader triangles– Cast Aluminum (A356 T51)

– Lowest manufacturing costComplex shapes & large size ideal for casting

No further discussion of Triangle design

Questions?


Axial Support SystemOptical Performance– Whiffletree support points and pivot locations determined by optimization

– Pivot locations unique for each of the 82 segment typesSee PDR Volume-2 for details

Axial support gravity print-thru:– Figured out at ςseg=0

– Springs-back as [1-cos(ςseg)]

– Surface error amplitude ~10 nm RMS (ςseg=90)

See PDR Volume-3 for details


LATERAL SUPPORT SYSTEM

SSA Design


Lateral Support SystemLateral Support Design– Simple Flat Central Diaphragm

Low costCompact (space limited by 45mm thick mirror)

– no decoupling flexures

– Diaphragm material: Invar 36 (one piece)Baseline for optical performance analysisPrefer to use INOVAR from Imphy Alloys (Fr.)

– High purity, w/Low Carbon content Low CTE [~1/2 of regular Invar (0.65 PPM/C)]Better temporal stability

– Bonded directly to mirror:Adhesive: 3M EA-2216, 0.250mm bondline (0.010”)

Diaphragm dimensions:– Rim OD: 150 mm OD, Hub OD 60 mm– Flexure region: OD 130mm, 0.350 mm thick

10 mm wide outer rim bonded to glass

– Mirror Pocket: 156 mm by 25.5 mm deep

Rimt=3mm

Central hubt=8.5mm

Flexuret=0.350mm

Detailed discussions:

PDR Volumes-3 & -5


Lateral Support System

Diaphragm: Cross-Section View

Mirror Segment

Moving Frame

Diaphragm

Adhesive Bond:Diaphragm to Glass

Adhesive layer


Lateral Support SystemMoving frame concept isolates diaphragm

Makes operating diaphragm deflections small:

High strength material not required

Lateral Support gravity print-thru– Lateral support gravity print-thru:

– Zero out at ςseg=0

– Springs-back as [sin(ςseg)]

– Surface error amplitude ~12 nm RMS (ςseg=90)

Diaphragm Attached to Moving Frame

Detailed discussion: PDR Volume-3


Tower, Guide Flexure, Locks and Registration

SSA Design


Tower & Guide FlexureTower & Guide Flexure:– Provide lateral load-path for SSA

Connect Moving Frame to Subcell (Fixed Frame)

– Accommodate segment piston/tip/tilt

– Guide flexure details in PDR Volume-5

Tower assembly includes:– ½ of the registration interface

– ½ of the SSA lock system

Tower: 6061-T6 Aluminum weldment

SSA Lock3 ea.

Guide Flexure

Registration3 ea. at 120 deg

Tower

Moving Frame (MF)

Guide FlexureAttached to MF at ID

Guide FlexureAttached to Tower at OD


Tower & Guide Flexure

Mirror Segment

MovingFrame

GuideFlexure

Clearance hole for Mirror Support Rod Flexure

Attached to MF

Attached to Tower

Convolution for piston compliance


SSA LocksLocks:– Three per SSA:

Secure Moving Frame to Tower

– Permanently installed

– Enable safe handling, installation & removal

– Support segment during actuator change-out

– Latched by spring-plunger detent

– Hardened cam keyed to handle

– Hardened insert mounted in moving frame

Cam

Spring Plunger


SSA Lock PositionsLocked:– Moving frame pushed to “Neutral” position

Nominal Clearance 0.250 mm

– MSA can be installed, removed and handled

– Actuator can be replaced

Unlocked:– Moving Frame and Tower not in contact

– Act as Piston/Tip/Tilt hard-stopNominal clearance +/-3 mm SSA range of travel

– outside range of actuator hard stops (+/-2.5mm)

Moving Frame

Moving Frame

No further discussion of Lock design

Questions?


RegistrationRequirements & Goals– Repeatability +/-0.050mm in-plane– Stiff connection in all DOF– Face-to-face axial registration with thru-bolt

Strong, stiff and easy to dimensionally inspectLateral registration features not in axial load path

– Sufficient strength to position segments at 14.5 deg inclination during installation

0.25g lateral load plus friction

– Cycles: Assume one Installation & Removal per year for 50 years (50 cycles)

Implies a near-kinematic designDesign concept:– Set of 3 tangential and axial contacts, 120 deg apart– Lateral registration features:

Tapered pin in V-groove with small in-plane radial clearance when assembled– Clearance allows Tower to move slightly in X,Y, & Clocking

– Axial registration features:Mating flat surfaces clamped by thru bolt

– Friction joint during operation


Registration Hardware

Tower Separated From Fixed Frame Tower Lowered to Fixed Frame

Captive Bolt Tightened to Clamp Joint

Registration mating sequence (typical 3 places @ 120 deg)

Conical Pin V-groove


RegistrationTapered pin:– Material: Ti 6Al-4V Annealed & Nitrided

120 ksi base metal

TiN: Rc70 surface coating for galling resistance

Insert ring:– Material: 17-4 PH Condition H1025

145 ksi yield strength

Contact stress– Contact force 1009N

210 kg at 14.5 deg inclination with sliding friction coefficient of 0.5

– 60 ksi max subsurface von Mises stressFSy = 2.0

Result:– Durable interface that will not Yield or Gall


RegistrationPin-Insert clearance:

Cost:– Machine shop quote: $400/set, in quantity

Registration Bushing Clearance(mm on Diameter)

Nominal Diameter mmDiameter Tolerance Min Max

Insert 20.050 0.015 20.035 20.065Tapered Pin 20.000 0.005 19.995 20.005

Clearance 0.030 0.070

No further discussion of Registration design

Questions?


WARPING HARNESS SYSTEM

SSA Design

PDR Volume-4 Dedicated to Design and

Analysis of Warping Harness


Warping Harness Approach & ArchitecturePurpose:– Allow automated periodic correction of low order surface distortions:

Residual errors from polishing

Coating stress distortion

Seasonal mean-value of thermal distortion

Segment positioning errors within the array (Focus and Astigmatism)

etc.

Fundamental Approach:– Extension of the Keck design

– Re-figure the mirror by bending it in a controlled manner using whiffletree

– Bending moments introduced into whiffletree by a set of moment actuators

– Actuators are motorized, instrumented and tied into the M1CS

Architecture:– 21 whiffletree joints are fitted with moment-actuators

– Lead screw pushes against an instrumented leaf-spring to create a moment

– Stepper motor drives lead screw to permit automation


Design Concept Actuator Schematic– Stepper motor driven screw displaces end of leaf-spring

– Strain gauge on leaf-spring provides feedback for motor control

– Motors will be mounted on the large whiffletree triangles and to the moving frame

Screw

Leaf-spring

Stepper Motor

Nut

Strain GaugeWT Joint Flexure

(sheet flexure not shown)

Axial Support Flexure

Large Triangle

Small Whiffletree TriangleSmall Whiffletree Triangle


Optical Performance Analysis

Mx’’ & My’’ Large Triangles, 3ea(Only M required)

Mx’ & My’ Outer Triangles, 6ea

MInner Triangles, 3ea(Mr not required)

Actuator Layout– 21 Actuators

Indicates Applied Moments(Equal and Opposite)


Optical Performance AnalysisActuator Layout– 21 Actuators integrated into axial support system

Leaf Spring (Typ.)

Actuator (Typ.)


SUBCELL

SSA Design

Fixed FrameAAPsActuator Flexure


Subcell DesignFixed Frame– Provides a stiff, stable interface between MSA and Mirror Cell

– Construction: Welded 6061-T6 Aluminum (2 versions due to segmentation)

– Interfaces:Mirror cell (via AAPs)

MSA (via tower registration features)

Actuators (bolted and pinned joints at ends of Fixed Frame)

Segment lifting jack (at center post) See PDR Volume 6 for details

– Deep cross-section required to meet 35 Hz for Lateral modeOptimized to reduce mass

Fixed Frame

ActuatorAttachment

AAP

NEXT SLIDE


AAP DesignAAP Requirements/Features– Range of Travel

+/-8mm adjustment in-plane– Mirror Cell mfg. tolerances (5mm) plus segmentation

effects (3mm)

+/-5mm vertical adjustment

– Aligned one time during construction and permanently locked/pinned

Jam nuts and match-drilled dowel pins

– Smooth adjustment (resolution)

– 30mm post diameter required for stiffness35 Hz lateral mode

– Welded Stainless Steel Post bolted to Mirror Cell

– Brass Spherical Nuts

– Stainless Steel Spherical Washers

– Special tools required to torque assy.Cross Section of AAP

Threaded Post: bolted to truss

Spherical Nut 2ea.

SphericalWasher 2ea.

Lock Nut 2ea.

Dowel PinsMatch drilled at

assy. 2 ea.

Fixed Frame integration discussed in PDR Volume-6

Alignment budget discussed in PDR Volume-2


Subcell DesignFixed Frame (Top plate removed)

Actuator AttachmentCastings

Jack Center Shaft Support and Bushings See PDR Volume-6 for Jack Design

Registration Pins3 ea.

Tower Clocking Pin See PDR Volume-6

AAP attach hole

Holes for surveying target holders 3ea.See PDR Volume-6

Jack Center Shaft Guide & Retention Pin See PDR Volume-6


Actuator FlexureDesign Overview– Actuator Rod Flexure Design – See PDR Volume-5 for Details

Flexible Region:7.23mm OD x 115mm Long

Knurled


Summary:Just Presented:– M1 Overview– SSA Project Overview– Key Requirements– Subsystem Designs

Additional Presentations to Follow:– Volume-2: System Level Calculations

– Volume-3: System-Level Finite Element Analysis

– Volume-4: Warping Harness Design and Analysis

– Volume-5: Flexure Design and Analysis

– Volume-6: Handling and Integration

– Volume-7: Summary and Future Plans

Additional Comments & Questions?


Acknowledgements

Acknowledgements:

The TMT Project gratefully acknowledges the support of the TMT partner institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the California Institute of Technology and the University of California. This work was supported as well by the Gordon and Betty Moore Foundation, the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the National Research Council of Canada, the Natural Sciences and Engineering Research Council of Canada, the British Columbia Knowledge Development Fund, the Association of Universities for Research in Astronomy (AURA) and the U.S. National Science Foundation.


BACKUP SLIDES


SSA MaterialsMaterial Properties for Key Components

Piece Part Drawing Number

Title QTY. MATERIAL Type/GradeModulus

GPaPoisson's

Ratio

Yield Strength,

MPa

Density kg/m3

CTE ppm/C

280-TMT-01-10001 Actuator Flexure 3 Titanium Ti 6Al-4V Annealed 112 0.31 862 4438 8.73280-TMT-01-11111 Mirror Support Rod Flexure 27 CRES 304V 94% Cold Work 179.3 0.28 1724 7933 15.57280-TMT-01-11112 Mirror Support Puck 27 Invar INVAR 130 0.29 260 8050 1.3280-TMT-01-11121 Central Diaphragm 1 Invar INVAR 130 0.29 260 8050 1.3280-TMT-01-11201 Triangle-Triangle Pivot 9 CRES 17-4 PH H1025 201.7 0.27 1000 7850 10.8280-TMT-01-11202 Moving Frame-Large Triangle Pivot 3 CRES 17-4 PH H1025 201.7 0.27 1000 7850 10.8280-TMT-01-11203 Sheet Flexure 6 Aluminum 7075 T651 71.7 0.33 462 2801 22.14280-TMT-01-11211 Inner Triangle A 3 Aluminum 6061 T6 Extrusiuon 69.65 0.33 228 2718 22.8280-TMT-01-11221 Outer Triangle B 3 Aluminum 6061 T6 Extrusiuon 69.65 0.33 228 2718 22.8280-TMT-01-11231 Outer Triangle C 3 Aluminum 6061 T6 Extrusiuon 69.65 0.33 228 2718 22.8280-TMT-01-11241 Middle Triangle D 3 Aluminum A356 T51 71.0 0.33 103 2691 20.7280-TMT-01-11242 Middle Triangle D Casting Per AMS 4217280-TMT-01-11243 Motor Mount 3 Aluminum 6061-T651 Per QQA-250/11 69 0.33 241 2718 22.77280-TMT-01-11251 - P1 Warping Harness Leaf Spring - Inner 3 Aluminum 7075-T651 per QQ-A-250/12 72.1 0.33 462 2801 22.14280-TMT-01-11251 - P2 Warping Harness Leaf Spring - Outer 9 Aluminum 7075-T651 per QQ-A-250/12 72.1 0.33 462 2801 22.14280-TMT-01-11261 Moving Frame Machined Assembly 1 Aluminum 6061 T6 Extrusiuon 69.65 0.33 228 2718 22.8280-TMT-01-11262 Moving Frame Weldment 6061 T6 Extrusiuon 69.65 0.33 228 2718 22.8280-TMT-01-11263 Actuator Rod Clamp 3 CRES 6061-T651 Per QQA-250/11 69 0.33 241 2718 22.77280-TMT-01-11264 Actuator Rod Clamp Mount 3 CRES 6061-T651 Per QQA-250/11 69 0.33 241 2718 22.77280-TMT-01-11275 Lead Screw 21 CRES280-TMT-01-11281 Guide Flexure 1 Aluminum 7075-T651 per QQ-A-250/12 72.1 0.33 462 2801 22.14280-TMT-01-11282 Guide Flexure Clamp 1 Aluminum 6061-T651 Per QQA-250/11 69 0.33 241 2718 22.77280-TMT-01-11283 Guide Flexure Mounting Flange 1 Aluminum 6061-T651 Per QQA-250/11 69.0 0.33 241 2718 22.77280-TMT-01-11284 Guide Flexure Center Clamp 1 Aluminum 6061-T651 Per QQA-250/11 69 0.33 241 2718 22.77280-TMT-01-11301 Tower Machined Assembly 1 Aluminum 6061-T651 Per QQA-250/11 69 0.33 241 2718 22.77280-TMT-01-11303 Tower Connector Mount 1 Aluminum 6061-T651 Per QQA-250/11 69 0.33 241 2718 22.77280-TMT-01-11304 V-Groove Insert, Registration 3 CRES 17-4 PH H1150 201.7 0.27 690 7850 10.8280-TMT-01-12001 AAP Post 3 CRES 304L 179.3 0.28 206 7933 15.57280-TMT-01-12002 AAP Jam Nut 6 Steel, Plated280-TMT-01-12003 AAP Upper Nut 3 Brass280-TMT-01-12004 AAP Lower Nut 3 Brass280-TMT-01-12005 AAP Lower Spherical Washer 3 CRES280-TMT-01-12006 AAP Upper Spherical Washer 3 CRES280-TMT-01-13001 Fixed Frame Machined Assembly 1 Aluminum 6061-T651 Per QQA-250/11 69 0.33 241 2718 22.77280-TMT-01-13002 Fixed Frame Weldment 6061-T651 Per QQA-250/11 69 0.33 241 2718 22.77280-TMT-01-13006 Tapered Pin, Registration 3 Titanium Ti 6Al-4V Annealed, TiN Coated

Documents

TMT M1 Segment Support Assembly (SSA) Preliminary Design Review (PDR) Volume-1: OVERVIEW