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首页> 外文期刊>Mechanical systems and signal processing >Separation of non-stationary multi-source sound field based on the interpolated time-domain equivalent source method
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Separation of non-stationary multi-source sound field based on the interpolated time-domain equivalent source method

机译：基于插值时域等效源法的非平稳多源声场分离

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摘要

In the sound field with multiple non-stationary sources, the measured pressure is the sum of the pressures generated by all sources, and thus cannot be used directly for studying the vibration and sound radiation characteristics of every source alone. This paper proposes a separation model based on the interpolated time-domain equivalent source method (ITDESM) to separate the pressure field belonging to every source from the non-stationary multi-source sound field. In the proposed method, ITDESM is first extended to establish the relationship between the mixed time-dependent pressure and all the equivalent sources distributed on every source with known location and geometry information, and all the equivalent source strengths at each time step are solved by an iterative solving process; then, the corresponding equivalent source strengths of one interested source are used to calculate the pressure field generated by that source alone. Numerical simulation of two baffled circular pistons demonstrates that the proposed method can be effective in separating the non-stationary pressure generated by every source alone in both time and space domains. An experiment with two speakers in a semi-anechoic chamber further evidences the effectiveness of the proposed method.
机译：在具有多个非平稳声源的声场中，测得的压力是所有声源产生的压力之和，因此不能直接用于单独研究每个声源的振动和声辐射特性。本文提出了一种基于内插时域等效声源方法（ITDESM）的分离模型，以将属于每个声源的压力场与非平稳多声源声场分开。在所提出的方法中，首先扩展了ITDESM，以建立混合的随时间变化的压力与具有已知位置和几何信息的分布在每个气源上的所有等效气源之间的关系，并且每个时间步长的所有等效气源强度通过迭代求解过程；然后，将一个感兴趣的源的相应等效源强度用于计算仅由该源生成的压力场。两个带挡板的圆形活塞的数值模拟表明，该方法可以有效地分离时空域中每个源单独产生的非平稳压力。在半消声室中使用两个扬声器进行的实验进一步证明了该方法的有效性。

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