Title :
Real-time enhancement of reference signals for feedforward control of random noise due to multiple uncorrelated sources
Author :
Dehandschutter, Wouter ; Van Herbruggen, Joris ; Swevers, Jan ; Sas, Paul
Author_Institution :
Dept. of Mech. Eng., Katholieke Univ., Leuven, Belgium
fDate :
1/1/1998 12:00:00 AM
Abstract :
The problem envisaged in this paper is the optimization of the reference set for broadband feedforward control of sound and vibration in the presence of multiple, uncorrelated primary sources. A real-time algorithm is presented that generates a set of orthogonal virtual references out of a given set of reference signals. The algorithm is based on recursive singular value decomposition (SVD) techniques. The technique simplifies controller design in the sense that primarily, comparable control performance can be achieved using a reduced set of virtual references instead of the extensive original reference set. Hence, controller dimensions (and, thus, the memory requirements for implementation) and the computational burden reduce accordingly. Second, it is shown that convergence speed of the adaptive filtered-X LMS feedforward control algorithm is enhanced. The technique is applied to active control of structure-borne road noise inside a car cabin. Time domain simulation of a control configuration, utilizing either an extensive set of original references as well as a reduced virtual reference set, shows that in the frequency ranges of interest, a set of four virtual references yields the same noise reductions as the original set of 12 references
Keywords :
acoustic noise; acoustic signal processing; active noise control; adaptive control; adaptive filters; adaptive signal processing; automobiles; convergence of numerical methods; feedforward; least mean squares methods; optimisation; random noise; singular value decomposition; time-domain analysis; vibration control; adaptive filtered-X LMS feedforward control algorithm; broadband feedforward control; car cabin; computational burden; controller design; controller dimensions; convergence speed; multiple uncorrelated primary sources; multiple uncorrelated sources; noise reductions; optimization; orthogonal virtual references; random noise; real-time enhancement; recursive singular value decomposition technique; reference signals; sound; structure-borne road noise; time domain simulation; vibration; virtual references; Acoustic noise; Active noise reduction; Adaptive filters; Computational modeling; Convergence; Least squares approximation; Roads; Signal generators; Singular value decomposition; Vibration control;
Journal_Title :
Signal Processing, IEEE Transactions on