能動制御型防音ボックスに関する研究（ポイントアクチュエータと圧電フィルムセンサによるアクティブ遮音制御の適用）

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  • Acoustic Enclosure with Active Sound Transmission Control Using Point Force Actuators and Piezo Electric Film Sensors

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This paper deals with an active acoustic enclosure for high precision measurement apparatuses such as Atomic Force Microscope; AFM, etc. Usually these apparatuses are installed in heavy enclosure boxes in order to prevent the vibration due to surrounding noises. But the weight of the enclosure may limit the installation site because the heavy enclosure needs strong floor. By applying active sound transmission control method to the panels of the enclosure, high-performance and lightweight can be realized simultaneously. We have proposed the active control method of transmitted sound power through a panel using four point force actuators and have both theoretically and experimentally demonstrated the high performance of this method. In this study, the proposed active control method is applied to the five panels of an enclosure and its performance is verified experimentally. The positions of the point force actuators are carefully considered to excite vibration on the panels so that the transmitted sound is effectively suppressed. Furthermore, one quadratically shaped PVDF film stripe is used as an error sensor to suppress the sound pressure inside the enclosure globally. The experimental results in the case that the PVDF film sensors are used are compared to those that a conventional microphone is used.

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