601 膜を用いた非接触音場分布計測における膜の支持方法の影響に関する検討

概要

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A new technique for measurement of two-dimensional acoustic field near the sound source is developed instead of using microphone. A distribution of vibration velocity on a film due to acoustic wave can be acquired as a distribution of normal particle velocity by means of laser Doppler vibrometer which has scanning mirrors. This proposed technique is advantageous to the measurement of an arbitrary angle with a target source, as compared with using microphones. In the previous investigation, it is found that a boundary condition leads to fluctuation of a vibration velocity distribution around the boundary. It is supposed that a reflection of travelling wave on the film causes at the boundary. In this report, an analysis for this problem is developed, and a method to reduce the fluctuation is discussed.
一般社団法人日本機械学会の論文
2002-03-14