ACTIVE FEEDBACK CONTROL SYSTEM FOR TRANSIENT NARROW-BAND DISTURBANCE REJECTION OVER A WIDE SPECTRAL RANGE

摘要

A control system provides active attenuation of excitations to a region orstructure (1). A feedback sensor (14) generates a signal in response toexcitations of the region (1) which is fed to a narrow-band feedbackcontroller (5) having a frequency detector (4), a bandpass filter (6)controlled by the frequency detector (4), and a feedback control generator(8). The frequency detector (4) determines the peak frequency of theexcitations. A bandpass filter (6) passes only those signals from the feedbacksensor (14) in a narrow frequency band adjustably controlled by the frequencydetector (4). The feedback control generator (8) receives the filtered signalfrom the bandpass filter (6) and produces a control output used by an actuator(13) to attenuate the excitations. Several bandpass filters (6) can be used inparallel to attenuate several frequency bands if the excitation source has aplurality of peaks. This configuration allows the bands to move across thefrequency spectrum in response to the excitations.