Abstract:Measuring supersonic acoustic intensity can help identify noise sources directly related to the far field acoustic radiation, which is very important for the control of structural borne-noise. The snap shot method and scanning method are the conventional choice to measure the supersonic acoustic intensity. However, the snap shot method requires a huge amount of transducers and recording devices, and the scanning method requires to know the number of potential noise sources and reference signals related to these sources in advance, which are difficult to be obtained in practice. To avoid the problems associated with above-mentioned measurement methods, a method for measuring the approximate supersonic acoustic intensity is proposed, which does not require any prior information about potential sources and reference signals, and can be implemented by sequentially scanning with a small amount of transducers and recording devices. The numerical and experimental results show that the proposed method can identify the sources responsible for far field acoustic radiation effectively.
Key words: supersonic acoustic intensity; reference signals; sound source identification
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