Astronomy / Engineering
Turning a satellite from within
Turn the satellite using three internal flywheels. Watch angular momentum move between wheels and body, then unload saturated wheels with external thrusters.
The model and its limits
Rigid-body Euler equations, three wheel momentum limits and bounded motor torques. Unloading uses an explicit external thruster torque; the disturbance is a prescribed body-axis torque. Flexible panels and motor electronics are omitted.
Equations used in the module
Equations H = R (I omega + h); I omega_dot = tau_ext - h_dot - omega cross (I omega + h); |h_i| <= h_max
