Nutation damping in a dual-spin spacecraft

Details Nutation damping in a dual-spin spacecraft Nutation damping in a dual-spin spacecraft

1979-03-29

1981-06-09

Miller, J. D.

Aeronautics and astronautics

Spacecraft

Attitude control

244164, 244171, B64G 138

Patent

active

042720451

ABSTRACT:
A dual-spin spacecraft having a momentum wheel spinning relative to a platform to provide bias momentum utilizes cross products of inertia (POI) existing in the platform between the spinning axis and the transverse axes to achieve nutation damping. When the platform is rotating or is displaced from a reference the cross products of inertia are also rotating or are displaced causing thereby degradation of the optimum nutation damping time constant. Two or more phase shifting networks are provided to be sequentially coupled into a control loop to shift nutation signals to effect optimum nutation damping at selected positions of the rotating or displaced platform without substantial nutation damping time constant degradation.

REFERENCES:
patent: 3695554 (1972-10-01), Phillips
patent: 3830447 (1974-08-01), Phillips
patent: 4096427 (1978-06-01), Rosen et al.

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