Path: Missions/Comsat
% Design the Pitch Loop including a tach loop for the wheel.
If no output arguments are entered, or torqueStep is entered, the function
will plot the step response of the system.
The pitch controller input is pitch and the output is wheel speed demand.
The tach controller has two inputs: [wheel speed;wheel speed demand + nominal wheel speed]
Its output is torque. The wheel speed demand must include the nominal wheel
speed!
Each controller has one state.
--------------------------------------------------------------------------
Form:
[aM, bM, cM, dM, aP, bP, cP, dP, clEv] = PitchLoop( inrPitch, inrWheel, beta, zetaM, zetaP,
wM, wP, dT, dTransform, torqueStep )
--------------------------------------------------------------------------
------
Inputs
------
inrWheel (1,1) Wheel inertia
inrPitch (1,1) Pitch inertia
beta (1,1) Wheel rate damping constant
zetaM (1,1) Tach loop damping ratio
zetaP (1,1) Pitch loop damping ratio
wM (1,1) Tach loop undamped natural frequency
wP (1,1) Pitch loop undamped natural frequency
dT (1,1) Sampling period
dTransform (1,1) 'Delta', or 'Z' default is 'Z'
torqueStep (2,1) External disturbance and friction torque
-------
Outputs
-------
aM (1,1) Tach loop plant matrix
bM (1,2) Tach loop input matrix
cM (1,1) Tach loop measurement matrix
dM (1,2) Tach loop feedthrough matrix
aP (1,1) Pitch loop plant matrix
bP (1,1) Pitch loop input matrix
cP (1,1) Pitch loop measurement matrix
dP (1,1) Pitch loop feedthrough matrix
cLEv (5,1) Closed loop eigenvalues
--------------------------------------------------------------------------
Common: Control/C2DZOH Common: Control/C2DelZOH Common: Graphics/NewFig Common: Graphics/TitleS Common: Graphics/XLabelS Common: Graphics/YLabelS
Back to the Missions Module page