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Inverse identification of the acoustic pressure inside a U-shaped pipe line based on acceleration measurements

机译：基于加速度测量，逆识别U形管线内的声压

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In Oil & Gas industry, the high internal sound pressure levels in pipe lines often cause significant structural vibrations. Quantification of the internal acoustic pressures is therefore an important step in understanding the global fluid-structure behaviour of such systems. However, direct acoustic measurements are often not possible since they generally require intrusive access to the pipe interior. In this paper an inverse procedure is proposed to identify the internal sound pressure field within the bend of a U-shaped pipe, from non-intrusive acceleration measurements on the mechanical structure. First, the accelerance transfer functions are measured in the bends and synthesized using a modal expansion. Under operational excitation conditions, the internal sound pressure is then obtained from a Tikhonov regularization of the inverse problem. The limits of the methodology are investigated numerically and experimentally to serve as a fast diagnostic tool for in situ vibration treatment of piping systems.
机译：在石油和天然气工业中，管道线的高内部声压水平经常引起显着的结构振动。因此，内部声压的定量是理解这种系统的全球流体结构行为的重要步骤。然而，直接声学测量通常是不可能的，因为它们通常需要对管道内部的侵入性。在本文中，提出了一种逆过程，以识别U形管道弯曲内的内部声压场，从机械结构上的非侵入式加速度测量。首先，在弯曲中测量加速传递函数并使用模态扩展合成。在操作激发条件下，然后从逆问题的Tikhonov正则化获得内部声压。在数值上和实验上研究了方法的限制，用作用于管道系统的原位振动处理的快速诊断工具。

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