Automatic Measurement of Spatial Acoustic Intensity : Vibration, Control Engineering, Engineering for Industry

概要

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A method automatically of measuring acoustic intensity is presented in this paper. This method uses measurements of the cross spectrum of the sound pressures at two closely spaced microphones. The two microphones used are arranged side by side and slid back and forth by a small distance in the direction of the microphone axes which are symmetric with respect to the holder axis. The holder can be turned on its axis by steps of a fixed angle for measuring the three directional components of an acoustic intensity vector. The acoustic intensity at a field point can be automatically measured by microphones arranged in this manner. This method is actually applied to the visualization of the flow pattern of sound energy emitted from a rectangular plate vibrating in resonance modes. As a result, an acoustic intensity probe composed of two microphones, as used in this study, has been proved to be an appropriate sensor for the automatic measurement of spatial acoustic intensity vectors.