Method and apparatus to extend the bandwidth of buffeting in fli

Details Method and apparatus to extend the bandwidth of buffeting in fli Method and apparatus to extend the bandwidth of buffeting in fli

1978-08-17

1981-05-26

Hum, Vance Y.

Education and demonstration

Vehicle operator instruction or testing

Flight vehicle

307520, 328167, 330126, G09B 908

Patent

active

042689791

ABSTRACT:
Method and apparatus for driving the motion system of a flight trainer to simulate aircraft buffeting which method and apparatus avoids the resonant frequency of the motion systems hydraulic actuators by using a "Linear Tracking Band-Stop Filter". Band-stop filter circuitry is combined with linear tracking band pass filter circuitry to provide the linear tracking band-stop filter. This circuit receives command signals intended for the servoamplifier used to drive a hydraulic actuator. The band-stop filter eliminates or substantially attenuates those frequencies contained in the command signal which would cause resonance of the hydraulic actuator. It has been discovered that the resonance frequency of the hydraulic actuator varies as a function of the extension of the actuator, and therefore in this invention the center frequency of the band-stop filter tracks the resonant frequency of the actuator such that a much smaller band of frequencies is eliminated.

REFERENCES:
patent: 3307408 (1967-03-01), Thomas et al.
patent: 3376658 (1968-04-01), Thurner
patent: 3421141 (1969-01-01), Meygrhoff
patent: 3659212 (1972-04-01), Saliga
patent: 3787774 (1974-01-01), Tietze et al.
patent: 3912916 (1975-10-01), Grun et al.
patent: 3919648 (1975-11-01), Uetrecht
patent: 3978420 (1976-08-01), Lane
patent: 3987370 (1976-10-01), Schutz
patent: 4001712 (1977-01-01), Chambers et al.
patent: 4030208 (1977-06-01), Carver et al.
Sound and Vibration; "Active Vibration Isolation for Aircraft Seating;" Mar., 1972; pp. 18-23.

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