Path: SC/Dynamics
% Model for a spacecraft with a single pivoted momentum wheel. The pivot has one degree of freedom of rotation about the axis uP. The wheel has one degree of rotation about the axis uW. The wheel is assumed to be symmetric. -------------------------------------------------------------------------- Form: [xDot, h, i, p] = SCwPivot( x, jW, jP, iS, t, tW, tP, uW, uP ) -------------------------------------------------------------------------- ------ Inputs ------ x (6,1) State vector [theta,w(3,1),wP,wW] jW (3,3) Wheel inertia (must be symmetric) jP (3,3) Pivot assembly inertia iS (3,3) Spacecraft inertia t (3,1) Body torque tW (1,1) Wheel torque tP (1,1) Pivot torque uW (3,1) Wheel axis uP (3,1) Pivot axis ------- Outputs ------- xDot (6,1) State vector [theta,w(3,1),wP,wW] h (3,1) Momentum i (5,5) Generalized inertia matrix p (5,1) Dynamical coupling terms --------------------------------------------------------------------------
Common: Quaternion/AU2Q Common: Quaternion/Q2Mat Math: Linear/Cross Math: Linear/SkewSymm
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