CamCube Interim Review 2

ASEN 4028 – March 15, 2004Sam Baker

Tom FreestoneBrian MadgeBrian Roberts

Steve PfauJen Uchida

Overview

• Project Summary• Resolved Issues• Design Summary• Current Issues to

be Resolved• Schedule Progress• Budget Progress

Project Summary• Multi-year goal

– Design a pico-satellite around the CubeSat program guidelines. The satellite will be launched from the shuttle and orient itself in order to take pictures of the heat tiles with an onboard camera.

• Current year goal– Develop an attitude control system that

will orient the satellite and keep the on board camera steady for pictures.

Project Summary

• Reaction Wheel– Testing in a single axis– Possibility of testing in two axes

• Dual Disk testing apparatus– Applied torque from the reaction wheel

• 3-axis Gimbal– 2-axes will be locked for the single axis test– Measuring stability, slew rate, response to

applied forces

Resolved Issues

• Machining Time– Most parts

complete– 1 part left to

fabricate• Battery mounting

bracket

Design Summary – Cube

Design Summary – Cube

Design Summary – Dual Disk

Current Issues

• Load cell– Miscalculation of force from desired

torque numbers– Ordered new load cell (came in this

morning)– Each test only takes about 8 seconds

• Increase output voltage to the motion controller by 1mV every millisecond

Dual Disk Results

Dual Disk Results

• Wrong load cell• Noise

– ~5mV output– ~15 mV noise– Wobble in reaction wheel– Torque from wire

Current Issues• Wobble analysis

– Nutation angle, – Shaft displacement

from center of RW– Non-uniform mass

• Nutation– Number of

precessions per revolution

– Negative => retrograde

Budget Progress – Estimated Budget

System Est Price Price

Att Control $800.00 $667.79Att Determ $300.00 $294.00Electronics $50.00 $36.40

Misc $100.00 $14.97Structures $150.00 $124.91

Testing $2,000.00 $590.07Est Cost Actual Difference

$3,400.00 $1,728.14 $1,671.86

Budget Progress – Actual BudgetSystem Member Item Company Ordered Received Price

Att Control Tom 1.5-3 V DC Motor Radio Shack 11/12/03 11/12/03 $1.99 $4,000.00 CUStructures Sam 5052 H32 Aluminum 11/18/03 11/19/03 $9.04 $4,200.00 UROP

Testing Tom 3-Axis Gimbal Small Pts Cat 11/25/03 12/3/03 $27.95Att Determ Madge Rate Gyros/Eval Boards Analog Devices 11/30/03 12/3/03 $0.00Att Determ Madge Rate Gyros/Eval Boards Future Active Cat 12/1/03 $294.00

Final Report Jen Binding Report Kinko's 12/15/03 12/15/03 $14.97Att Control Madge A/D converter Future Active Cat 1/12/04 1/18/04 $93.00Att Control Steve Motors/Motion Controller Micro Mo Elect 1/16/04 1/20/04 $212.10 Structures Sam Bearing/Al Stock/Brass McMaster 1/22/04 1/28/04 $36.93Electronics Madge Static Mat Newark 1/28/04 2/26/04 $36.40Structures Sam Chucking Reamer McMaster 1/28/04 1/29/04 $10.96Att Control Steve Motors (5) Micro Mo Elect 2/22/04 2/25/04 $360.70Structures Sam Brass Online Metals 2/23/04 2/25/04 $24.83

Testing Roberts Load Cell Omega 2/23/04 2/25/04 $114.09Testing Roberts Batteries/Charger Eagle Pitcher 2/25/04

Structures Steve Screws/Aluminum Rod McGuckins 3/1/04 3/1/04 $21.14Structures Sam Chucking Reamer McMaster 3/3/04 3/4/04 $22.01

Testing Roberts Laser McGuckins 3/9/04 3/9/04 $12.13Testing Tom Camera Mike's Camera 3/10/04 3/10/04 $435.90

Spent $1,728.14 $6,471.86 Remain

Available Funds

Questions?