Abstract
All the current sound field separation methods based on particle velocity are apply measurement surfaces or a single measurement surface with pressure-velocity. In order to acquire less measurement data and efficient calculation, a sound field separation method with single holographic surface based on particle velocity is proposed. According to the principle of equivalent sources near-field acoustical holography technique, this method can separate directly the sound filed information radiated by target source from coherent sound fields. Numerical simulation analyzed the results with different frequencies and signal-to-noise ratio (SNR). The results show that this method can separate the coherent sources accurately and efficiently.
Highlights
Near-field acoustical holography (NAH) is a technique for reproducing sound field information [1, 2], because this algorithm has a great advantage in noise source identification and positioning, which gets a fast application in engineering
Sound field separation technology based on NAH requires that the traditional NAH measurement surface must be located on the same side of the sound sources
There are two main data input methods for sound field separation based on the equivalent source method [10], which is the sound pressure based on double measurement surface and sound pressure – vibration speed input method based on a single measurement surface
Summary
Near-field acoustical holography (NAH) is a technique for reproducing sound field information [1, 2], because this algorithm has a great advantage in noise source identification and positioning, which gets a fast application in engineering. Sound field separation technology based on NAH requires that the traditional NAH measurement surface must be located on the same side of the sound sources. There are two main data input methods for sound field separation based on the equivalent source method [10], which is the sound pressure based on double measurement surface and sound pressure – vibration speed input method based on a single measurement surface. Mao et al [12] used a single measurement surface to separate directly the coherent sources based on sound pressure. There are different transfer functions between the equivalent source point and different points in space, and we can obtain a single measurement surface sound field separation formula based on vibration velocity. SOUND FIELD SEPARATION METHOD WITH SINGLE HOLOGRAPHIC SURFACE BASED ON PARTICLE VELOCITY MEASUREMENT. With the above-mentioned method, the particle velocity radiated by the s can be separated from the coherent sound field
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