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Regularization method for measurement of structural intensity using nearfield acoustical holography

机译:利用近场声全息法测量结构强度的正则化方法

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摘要

The regularization method for measurement of structural intensity using nearfield acoustical holography is proposed. Spatial derivatives of normal displacement are necessary to obtain the structural intensity. The derivative operations amplify high-wave-number components of measurement noise. Therefore, the estimation of an appropriate wave-number filter is crucial for implementation of the measurement of structural intensity. In conventional methods, this wave-number filter is determined from the flexural wavelength. And the same wave-number filter is applied to obtain all spatial derivatives. As a result, structural intensity obtained from the pressure hologram, whose signal-to-noise ratio is low, is seriously contaminated by the noise. To overcome this difficulty, regularization theory is applied to determine the appropriate wave-number filter for each order of derivatives. The effectiveness of the proposed method is demonstrated by experiments. (c) 2005 Acoustical Society of America.
机译:提出了一种利用近场声全息法测量结构强度的正则化方法。法向位移的空间导数是获得结构强度所必需的。导数运算会放大测量噪声的高波分量。因此,合适的波数滤波器的估计对于实现结构强度的测量至关重要。在常规方法中,根据弯曲波长来确定该波数滤波器。并且使用相同的波数滤波器来获得所有空间导数。结果,从信噪比低的压力全息图获得的结构强度被噪声严重污染。为了克服这个困难,应用正则化理论来确定每个导数阶数的适当波数滤波器。实验证明了该方法的有效性。 (c)2005年美国声学学会。

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