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Estimation of Automotive Wind Noise by Coupling Direct Noise Computation to Statistical Energy Analysis

机译:通过将直接噪声计算与统计能量分析耦合来估计汽车风噪声

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A statistical energy analysis approach was developed in this paper for the prediction of the sound transmitted through a flexible plate loaded by the turbulent wake of a car rear view mirror. The fluid loading is simulated using a direct noise computation code. This code solves the full compressible three dimensional Navier-Stokes equations with highly accurate space and time algorithms and is able to capture the low amplitude acoustic part of the wall pressure fluctuations. The computed wall pressure field is used as power input in a statistical energy analysis model coupling the flexible plate to an acoustic cavity. Although the acoustic component is of small magnitude compared to the convected component of the fluid loading, it is shown that the non-resonating plate modes provide an efficient transmission path to the acoustic excitation which cannot be neglected below the coincidence frequency of the plate. Above this critical frequency, the sound pressure inside the cavity is driven by the resonant modes and the acoustic component of the wall pressure fluctuation.
机译:本文开发了一种统计能量分析方法,用于预测通过后视镜的湍流尾流加载的柔性板传递的声音。使用直接噪声计算代码模拟流体载荷。该代码使用高度精确的时空算法解决了可压缩的三维Navier-Stokes方程,并能够捕获壁压波动的低振幅声学部分。计算出的壁压力场在将柔性板耦合到声腔的统计能量分析模型中用作功率输入。尽管与流体负载的对流分量相比,声学分量的量级较小,但已显示,非共振板模式为声激发提供了有效的传输路径,在板的重合频率以下,这是不能忽略的。在此临界频率之上,腔体内的声压由共振模式和壁压波动的声学分量驱动。

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