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## This paper is a study of the acoustic reduction of sound transmission through an aperture at low frequency by using a controllable secondary source, whose strength can be controlled by using an adaptive control system. Hence, this paper includes the theoretical prediction of the acoustic reduction of sound transmission through an aperture when a secondary source is used to cancel the propagating plane mode wave, the derivation of the mathematical model of the adopted adaptive control system, the experimental determination of the corresponding transfer function of the control system to be adopted and the corresponding experiment on adaptive active control of acoustic transmission through an aperture at low frequency. Both the calculation of the acoustic reduction achieved by canceling the propagating plane mode wave and the experiment on the adaptive active control of the acoustic transmission through an aperture are based on an aperture of width 6.6 cm at 150, I75 and 200 Hz for three gain constants. And the corresponding results clearly show that the maximum acoustic reductions of 20 dB and I.5 dB are, respectively, obtained from calculation and experiment. The lower acoustic r

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Author

Chen Kuo-Tsai

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0003-682X)

Published

1995

Language

EN

Field

Engineering (Physical Sciences)