Active damping of spacecraft structural appendage vibrations

Details Active damping of spacecraft structural appendage vibrations Active damping of spacecraft structural appendage vibrations

1988-12-30

1990-01-09

Barefoot, Galen L.

Aeronautics and astronautics

Spacecraft

Spacecraft formation, orbit, or interplanetary path

244165, 244173, B64G 128

Patent

active

048922730

ABSTRACT:
An active vibration damper system, for bending in two orthogonal directions and torsion, in each of three mutually perpendicular axes is located at the extremities of the flexible appendages of a space platform. The system components for each axis includes: an accelerometer, filtering and signal processing apparatus, and a DC motor-inertia wheel torquer. The motor torquer, when driven by a voltage proportional to the relative vibration tip velocity, produces a reaction torque for opposing and therefore damping a specific modal velocity of vibration. The relative tip velocity is obtained by integrating the difference between the signal output from the accelerometer located at the end of the appendage with the output of a usually carried accelerometer located on a relatively rigid body portion of the space platform. A selector switch, with sequential stepping logic or highest modal vibration energy logic, steps to another modal tip velocity channel and receives a signal voltage to damp another vibration mode. In this manner, several vibration modes can be damped with a single sensor/actuator pair. When a three axis damper is located on each of the major appendages of the platform, then all of the system vibration modes can be effectively damped.

REFERENCES:
patent: 2550806 (1951-05-01), Hammond
patent: 3339863 (1967-09-01), Webb
patent: 3531063 (1970-09-01), Persegheffi
patent: 4562546 (1985-12-01), Wykes et al.
patent: 4567564 (1986-01-01), Bittner et al.
Bergeron et al., "Modular Spacecraft Sys", EPO Application No. 0196793, Oct. 1986.
Fleischer, "Multi-Rigid-Body Attitude Dynamics Simulation", NASA Technical Report 32-1516.

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