Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1975-10-21
1978-06-20
Schaefer, Robert K.
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
244170, B64C 1702
Patent
active
040964272
ABSTRACT:
A motor active nutation damping system employing a rotor mounted accelerometer, a platform/rotor relative rate sensor, a despin motor and a controller. In the presence of nutation, the accelerometer senses a sinusoidal acceleration whose amplitude is proportional to nutation angle and whose frequency is rotor nutation frequency, i.e., the rate at which the transverse angular momentum vector appears to rotate in rotor fixed coordinates. The controller multiplies the filtered accelerometer signal by a square wave at relative rate generated by the relative rate sensor to obtain a signal consisting of sinusoids at platform nutation frequency and higher order frequencies. Since platform nutation frequency is the rate at which the transverse angular momentum vector appears to rotate in platform fixed coordinates, spin axis torque appropriately phased at this frequency and applied to a dynamically imbalanced platform generates a transverse reaction torque that reduces the transverse angular rate associated with nutation. The controller accomplishes this function by appropriately filtering and amplifying the modulated signal, and then commanding a torque to the despin motor proportional to the resulting signal.
REFERENCES:
patent: 3695554 (1972-10-01), Phillips
patent: 3830447 (1974-08-01), Phillips
Rosen Harold A.
Salvatore Jeremiah O.
Felbhaus John J.
Hammond Noel B.
Hughes Aircraft Company
MacAllister W. H.
Schaefer Robert K.
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