Recovery of non-stationary free field with double-layer pressure measurements
Recovery of non-stationary free field with double-layer pressure measurements
复制标题
通过双层压力测量恢复非平稳自由场
DOI：
10.1016/j.ymssp.2018.11.039
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发表时间：
2019-04
影响因子：
8.4
通讯作者：
Xiao-Zheng Zhang
中科院分区：
文献类型：
--
作者：
Lin Geng;Chuan-Xing Bi;Xiao-Zheng Zhang
为了消除测量平面背面的非平稳入射场以及入射波落在目标源表面引起的非平稳散射场，提出了一种双层压力测量的非平稳自由场恢复方法。在该方法中，首先测量双层测量平面上随时间演化的混合压力并将其转换到时间波数域。然后，借助这些时间波数压力谱和脉冲响应函数，通过传统的非平稳声场分离方法来分离非平稳传入和传出场。随后，利用目标源表面反射系数的时间波数谱建立非平稳散射场与入射场之间的关系，并据此计算非平稳散射场。最后，从出射场中去除非平稳散射场，恢复目标源在自由场中辐射的非平稳声场。以激励平面钢板为目标源、单极子源为干扰源进行数值模拟，验证了该方法的可行性。恢复结果表明，该方法不仅消除了时间域和空间域上的入射场的影响，而且清除了非平稳散射场，从而提供了比非平稳声场分离方法更准确的恢复结果。实验进一步证明了所提方法的有效性。
To remove the non-stationary incoming field from the back side of the measurement plane and the non-stationary scattered field caused by the incoming wave falling on the surface of the target source, a recovery method of the non-stationary free field with double-layer pressure measurements is proposed. In this method, the time-evolving mixed pressures on double-layer measurement planes are first measured and transformed into the time-wavenumber domain. Then, with the aid of these time-wavenumber pressure spectrums and the impulse response function, the non-stationary incoming and outgoing fields are separated by the conventional non-stationary sound field separation method. Subsequently, the time-wavenumber spectrum of the surface reflection coefficient of the target source is employed to establish the relationship between the non-stationary scattered and incoming fields, based on which the non-stationary scattered field is calculated. Finally, the non-stationary scattered field is removed from the outgoing field and the non-stationary sound field that would be radiated by the target source in free field is recovered. Numerical simulation with an exciting planar steel plate as the target source and a monopole source as the disturbing source is used to examine the feasibility of the proposed method. The recovered results demonstrate that the proposed method not only removes the influence of the incoming field in the time and space domains, but also clears the non-stationary scattered field, thus providing more accurate recovered results than the non-stationary sound field separation method. The experiment further proves the validity of the proposed method.
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影响因子：
8.4
作者：
Geng, Lin;Bi, Chuan-Xing;Zhang, Xiao-Zheng
通讯作者：
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影响因子：
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作者：
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DOI：
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发表时间：
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期刊：
The Journal of the Acoustical Society of America
影响因子：
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作者：
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通讯作者：
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影响因子：
0.6
作者：
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通讯作者：
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DOI：
10.1121/1.3683249
发表时间：
2012-03
期刊：
The Journal of the Acoustical Society of America
影响因子：
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作者：
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通讯作者：
Xiao-Zheng Zhang;Jean-Hugh Thomas;C. Bi;J. Pascal