Week 7 Status Updates

Statement of Work: 

To design and prototype an attitude control system (ACS) for a Cube-Sat. This ACS will align the Cube-Sat with the desired direction as supplied by the Solar Sensor through magnetorquing using the Earth’s magnetic field. Our final deliverable will be a prototype and the control software.

Attitude Control System

Update 6-11-08

Questions for Vanderlei:

• Do we know the satellite’s location?  (GPS, etc)• Do we need translational force from the ACS, or just torque?  Is some unintended translation along with the rotation okay?• What is the intended time frame for the aligning the satellite?  Or is there a torque requirement?• How much tumbling is expected?• Is it viable to use superconducting coils?  Most CubeSats use copper wire, but this CubeSat may be different.• What is our power budget in relationship to other instruments on the CubeSat?• How much room are we allotted in the CubeSat for the ACS?

Start End PeopleResearch

Learn C for PICs now later deadline Lorraine and DanResources for Circuit Design now later deadlineExisting Systems now Fri 49 Christina & JacobRotational Physics now Fri 49E&M Review now Fri 49Control Methods Mon 46 later deadline Christina and JacobSatellite Orbits now Fri 49

Brainstorm Fri 49

ModelTheoretical Calculations Mon 46 Fri 42MATLAB Mon 46 Fri 42COMSOL - Optimization later

Design Prototype

Mechanical - SolidworksSoftware DesignCircuit Design - HardwareIntegration

Everything working togetherconnect with SOS

Prototypeorder materialsmachiningtestingfix

Final Deliverables Mon 4 Fri 0papereverything else

Statement of Work: 

To design and prototype an attitude control system (ACS) for a Cube-Sat. This ACS will align the Cube-Sat with the desired direction as supplied by the Solar Sensor through magnetorquing using the Earth’s magnetic field. Our final deliverable will be a prototype and the control software.

Attitude Control System

Update 6-12-08 Day 50

Research:

• Response from Vanderlei answering our questions, includes information about existing systems:

http://userpages.umbc.edu/~martins/cubesat/ACS/• Lecture from Steve on rotational physics (tensor style) and satellite physics• Software Team continued learning of C++

Attitude Control System

Update 6-13-08 Day 49

Model Outline:

• Have satellite in magnetic field, model rotation due to coil torques• Ignore orbit of satellite, separate problem• Finish by Friday, allow for testing of control algorithms

Environment/Model

Control Unit

Angular Velocity, AttitudeCoil Currents

Task Delineation:

• MATLAB Modeling: Dan, Christina, Jacob• Coil Design: Lorraine, Jacob• Control Research: Dan, Lorraine, Christina• Website: Christina• Learn C Programming: Lorraine, Dan• Model Verification: Jacob