CamCube Interim Review 2

1. CamCube Interim Review 2 ASEN 4028 – March 15, 2004 Sam Baker Tom Freestone Brian Madge Brian Roberts Steve Pfau Jen Uchida

2. Overview • Project Summary • Resolved Issues • Design Summary • Current Issues to be Resolved • Schedule Progress • Budget Progress

3. 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.

4. 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

5. Resolved Issues • Machining Time • Most parts complete • 1 part left to fabricate • Battery mounting bracket

6. Design Summary – Cube

7. Design Summary – Cube

8. Design Summary – Dual Disk

9. 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

10. Dual Disk Results

11. Dual Disk Results • Wrong load cell • Noise • ~5mV output • ~15 mV noise • Wobble in reaction wheel • Torque from wire

12. Current Issues • Wobble analysis • Nutation angle,  • Shaft displacement from center of RW • Non-uniform mass • Nutation • Number of precessions per revolution • Negative => retrograde

15. Budget Progress – Estimated Budget

16. Budget Progress – Actual Budget

17. Questions?