G - Physics – 06 – G
Patent
G - Physics
06
G
354/4
G06G 7/72 (2006.01) G09B 9/14 (2006.01)
Patent
CA 1124860
-28- 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 servo-amplifier 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.
333168
Barrigar & Moss
Singer Company (the)
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