摘要
当空间声场中存在多个相干声源时,运用常规的近场声全息算法无法重建和预测每个相干声源的声场分布,限制了声全息的应用范围和对相干声场的分析。在针对该问题的现有方法中,基于傅里叶变换的声场分离技术只能用于相干声源位于全息面两侧的情况,而分布源边界点法、联合波叠加法等虽然可解决相干声源位于全息面同侧的分离问题,但在应用时必须预先知道声源的位置以及几何形状等先验知识。针对相干声源在全息面同侧的情况,提出一种新的多源相干声场分离方法。该方法只需全息面声压,不需要其他先验知识就可以实现相干声场分离,能很好地弥补现有方法的缺点,并为相干声场的分析提供有力手段。数值仿真和试验验证该方法的正确性、可行性和有效性。
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 NAIl 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 proposed method.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2007年第9期173-178,共6页
Journal of Mechanical Engineering
基金
国家自然科学基金(50675056
10504006)。
关键词
相干声场
声全息
球面波
Coherent acoustical field Acoustical holography Spherical wave
