管内伝番騒音の密結合能動制御

概要

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This paper describes the active noise control in a piping. The noise control system is composed of the tight-coupled monopoles aranged along the pipe without flow. The equivalent matrixes of the system are derived from the linear theory in which such monopoles are treated as the acoustic elements absorbing sound energy. The transmission loss calculated by using the matrix element for sound pressure shows the fairly large level in the wide range of frequency, owing to the action of plural monopoles and the reflection effect between them. When the obsorption effect is enough large, the insertion loss obtained from the 4-terminal constants becomes plus also at the resonance frequencies of the inlet pipe and the tail pipe. The above facts indicate that the noise control characteristics of the system are improved as compared with those of the reactive silencers. These theoretical characteristics have been verified by the experiments.
東海大学の論文