Path: CubeSat/Simulation
% A spacecraft with rate or hysteresis damping.
You can try different kinds of damping. One is 3-axis damping
that applies a damping constant to each axis rate. You should
find a constant that approximates whatever damper you have.
If everything is working properly the spacecraft will align its
torque rod with the Earth's magnetic field.
This simulation does not have any disturbances. Run for a small number of
orbits to clearly see the hysteresis loops. They are minor loops since
the Earth's field is not strong enough to take the rod to saturation. Run
for several days to damp the rates close to zero.
The second type is magnetic hysteresis damping. Read the headers for
RHSHysteresisDamper.m, TorqueHysteresis.m, and MagneticHysteresis.m
MagneticHysteresis.m for more information.
Things to try:
1. Try both types of damping.
2. Determine a damping constant that produces the same results as
hysteresis damping.
3. Try different orbits.
4. Try different dipoles.
5. With no damping determine the oscillation frequency of the
spacecraft.
6. See what happens with a rotation rate about the dipole axis.
7. Remove the dipole and initialize with nonzero rates instead.
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See also BFromHHysteresis, RHSHysteresisDamper, RHSRigidBodyWithDamping,
HysteresisOutput
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Copyright (c) 2014 Princeton Satellite Systems, Inc.
All Rights Reserved
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Since version 2014.1
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AerospaceUtils: Coord/QLVLH CubeSat: AttitudeControl/InertiaCubeSat SC: BasicOrbit/El2RV SC: BasicOrbit/Period SC: DemoFuns/HysteresisOutput SC: Dynamics/RHSRigidBodyWithDamping SC: Environs/BDipole SC: MagneticControl/BFromHHysteresis SC: MagneticControl/RHSHysteresisDamper Common: Database/Constant Common: GUIs/Figui Common: Graphics/Plot2D Common: Graphics/TimeLabl Common: Quaternion/QTForm Common: Time/JD2000 Math: Linear/Dot Math: Linear/Mag Math: Linear/Unit
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