536 折り紙構造ヘルムホルツ共鳴器を用いた自動車車室内騒音の低減解析(騒音振動への適用,OS-16:折り紙・マイクロ・スマート構造)

概要

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In this paper the reduction analysis of the so-called 'booming noise', which occurs due to the resonance of vehicle cabin, is tried to carry out by using finite element method. For the reduction method a Helmholtz resonator, which is well known in the field of acoustics, is attached to a vehicle cabin. The resonance frequency of a Helmholtz resonator can be varied by adjusting the length of its throat. Therefore the resonance frequency of the resonator can be considered to follow the acoustical characteristics of the cabin by using an Origami structure. The simply shaped Helmholtz resonator is set up to the back of the cabin according to the resonance frequency of the cabin and the frequency response of the sound pressure at a driver's ear position is calculated by using finite element method. It is confirmed that the acoustical characteristics of the cabin is changed largely by attaching the resonator and the sound quality is quite varied. In future the analysis by using an Origami structure Helmholtz resonator should be performed.
社団法人日本機械学会の論文
2004-09-27