Noise source detection using a parabolic reflector.

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  • 集音器を用いた音源探索装置
  • シュウオンキ オ モチイタ オンゲン タンサク ソウチ

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Abstract

Noise suppression is one of the important subject in mechanical engineering, and many studies related to the subject have been reported. As an immediate approach, some visualization techniqes of the sound field are proposed, but most of them require long time to get the results, and a large scale equipment. In this paper, a simple method for noise source detection is proposed. Where the following result is utilized. The experimental results showed that a parabolic sound reflector forms a sound image near by the focus. A prototype detection system has been built, which consists of a 500 mm diameter parabolic reflector, a microphone array (6×8=48 units), and a LED array to display the sound image. For a point noise source of 5 kHz sine wave or pseud random wave, the direction of the source could be determined by the position of sound image. For double point noise sources of 5 kHz sine wave, about 15 degrees of angular resolution was obtained. This method enabled to detect the noise source in real time, and is expected to be applied for fluctuating noise source.

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