## DWheel:

Path: SC/Attitude

% Computes the damping coefficient ratio for a damper wheel.
Assumes a symmetric spinning spacecraft with a damper wheel about
one of its transverse axes. The damping is assumed to have
minimal effect on the spin rate. This function is useful for
studying the behavior of rigid bodies with damping and for
setting the damper wheel parameters when a damper wheel is used
to model damping from other sources such as slosh or magnetic
eddy currents. The damped natural frequency is constrained to be equal
to the undamped nutation frequency.
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Form:
[D1, D2] = DWheel( iT, iS, wS, tau, e )
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Inputs
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iT (1,1) Transverse inertia
iS (1,1) Spin-axis inertia
wS (1,1) Spin rate (rad/sec)
tau (n) Time constant
e (m) Ratio of damper wheel inertia to transverse
inertia
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Outputs
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D1 (1,1) Ratio of damping coefficient to damper wheel
inertia
D2 (1,1) Ratio of damping coefficient to damper wheel
inertia
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## Children:

Common: Graphics/NewFig
Common: Graphics/XLabelS
Common: Graphics/YLabelS
Common: Graphics/ZLabelS

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