農耕車両キャビンのこもり音低減に関する研究 : 音響的動吸振器による空洞共鳴周波数の制御(機械力学,計測,自動制御)

概要

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The purpose of this paper is to show a way to reduce the influence of an acoustic cavity mode in a cabin about agricultural machinery. The hexahedron chamber, regarded as the tractor cabin, is investigated. In this research, indoor acoustic cavity mode and the influence of the side-branch type resonator, tuned to the frequency of acoustic cavity mode, are measured and analyzed. It is shown that the resonator enables the frequency of acoustic cavity mode to move, so the resonator works like a dynamic absorber. Consequently, the way to control the frequency of an acoustic cavity mode is to add a resonator, which can change corresponding to the excitation frequency. Opening and closing the hole connecting to original chamber and resonator, one can make the frequency of acoustic cavity mode change. Moreover, the acoustic characteristics of the actual tractor cabin are analyzed. Comparing the experimental results about distribution of sound pressure and the effect of the resonator with those by software SYSNOISE, it is shown that the influence of an acoustic cavity mode is also reducible in the actual tractor.
2006-03-25