S ound field assessment by measurement of sound pressure distribution close to machine noise source (Estimation of normal particle velocity at an aperture by single-plane sound pressure measurement)

摘要

For the assessment of machinery noise, we describe a method of estimating the normal particle velocity distribution from a sound pressure distribution measured at a single aperture close to the sound source based on near acoustic holography(NAH). In NAH, it is required that the distance between the surface of the sound source and the measurement aperture is one-tenth of a wavelength.