camcube interim review 2 asen 4028 – march 15, 2004 sam baker tom freestone brian madge brian...
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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?