Cancellation Mechanism of Structure-Borne Sound

概要

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In order to suppress structure-borne sound radiated from a vibrating plate, vibration control of the plate is of primary importance. Instead of conventional vibration control methods which aim to merely eliminate the vibration, in this paper, utilization of the vibration to accelerate the cancellation mechanism of structure-borne sound is considered. First, with a view to clarifying the generation mechanism of structure-borne sound, acoustic intensity is considered at each vibration modal resonance frequency. From these distribution patterns of acoustic intensity the cancellation mechanism of the sound due to the existence of negative acoustic intensity is discussed, and an attempt to interpret the meaning of the negative acoustic intensity is made. In addition, it is shown that radiation patterns often taken for granted do not necessarily hold true for some vibration modes. Furthermore, the relationship between the radiation efficiency, radiated power and active control effect for suppressing the vibration is discussed. Finally, it is shown that the inherent cancellation mechanism is achieved not only spatially but also temporally in the acoustic field.
一般社団法人日本機械学会の論文
1993-12-15