SEPARATION METHOD OF MULTIPLE COHERENT

SOURCES BASED ON HYBRID

HOLOGRAPHIC ALGORITHM

ZHANG Yongbin BI Chuanxing CHEN Jian CHEN Xinzhao

(Institute of Sound and Vibration Research, Hefei University of Technology, Hefei 230009)

Abstract: The general near-field acoustical holography(NAH) cannot reconstruct and predict the information of each coherent source in multiple coherent acoustic field. So the application of NAH and analysis of coherent acoustic field is limited. Among the current solutions to this problem, the method based on fast Fourier transform (FFT) is valid only when the holographic plane is between the coherent sources. Other methods, such as distributed source boundary point method, wave superposition method, can be applied to the separation of coherent sources when the sources are in the same side of the holographic plane. But these two methods are only valid when the position and the shape of the sources are known. In order to overcome the disadvantages of the current methods applied to acoustic field in which the coherent sources are in the same side of the holographic plane, a new method for separation of multiple coherent sources is proposed, and the proposed method can be valid only by the holographic pressure but needs no any other prior information. The numerical simulations and the experiment validate the feasibility, efficiency and correctness of the pro-posed method.

Key words: Coherent acoustical field Acoustical holography Spherical wave

CLC No: TB532 TB533⁺.2

国家自然科学基金资助项目(50675056, 10504006). Received 20060630, received in revised form 20070416