Wr. Saunders et al., A HYBRID STRUCTURAL CONTROL APPROACH FOR NARROW-BAND AND IMPULSIVE DISTURBANCE REJECTION, Noise control engineering journal, 44(1), 1996, pp. 11-21
A hybrid structural control architecture which combines feedback-based
transient suppression and robust narrow-band disturbance compensation
using adaptive filtering methods is introduced in this paper, A gener
al formulation of the controller is introduced first, without regard t
o specific feedback or adaptive feedforward algorithms, It is shown th
at inclusion of a feedback loop around an adaptive feedforward path le
ads to faster convergence times of the adaptive compensator, The impro
ved convergence characteristics are shown to be quite important to the
performance of the adaptive control in the presence of impulsive dist
urbances. An important contribution of the proposed hybrid controller
is the generation of an uncontrollable reference signal for the adapti
ve filter via an estimate of the disturbance(s) from a Kalman filter,
Analysis of the hybrid compensator demonstrates that the new control l
aw functions as an adaptive feedback controller when the estimated dis
turbance is used for the reference signal, Demonstrations of the hybri
d control system are presented for a simply supported plate subject to
a mixed transient and persistent, narrow-band disturbance, Numerical
and experimental results are based on implementation of a discrete lin
ear quadratic Gaussian regulator design for the feedback loop and the
filtered-X least-mean-squares adaptive feedforward algorithm, The simu
lation and test results confirm improved convergence properties, stabi
lity, and performance robustness of disturbance compensation and reduc
ed sensitivity of the adaptive filter to transient disturbances for th
e hybrid implementation, The hybrid design has potential in improving
active control effectiveness in industrial noise and vibration control
problems characterized by mixed impulsive and persistent disturbances
. (C) 1996 Institute of Noise Control Engineering.