Abstract
This paper deals with the minimization of total acoustic power radiated from a vibrating distributed-parameter planar structure. This paper presents a novel control method utilizing both the smart sensors and cluster actuation, thereby enabling one to suppress the total acoustic power without causing observation/control spillover problems. First, the acoustic power matrix of a planar structure is shown to be expressed in a form of a block diagonal matrix by reordering the columns and rows of the matrix, and hence the suppression of the power mode defined in each block matrix leads to the suppression of the total acoustic power. Then, from a viewpoint of cluster actuation, the optimal control law for minimizing the smart sensor outputs is derived, its implementation being realized by using a filtered-x LMS algorithm. Furthermore, it is revealed that the smart sensing subsumes the already proposed cluster filtering. Finally, the experiment is conducted, demonstrating the validity of the proposed method for suppressing the total acoustic power.
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