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首页> 外文期刊>Journal of Sound and Vibration >Prediction of flow-induced structural vibration and sound radiation using energy flow analysis
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Prediction of flow-induced structural vibration and sound radiation using energy flow analysis

机译：利用能流分析预测流动引起的结构振动和声辐射

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摘要

The energy flow analysis method was used to predict the structural vibration response and the radiated sound power of a plate excited by wall pressure fluctuations under turbulent boundary layers, and separated-reattached flows. This method allows the spatially averaged energy density response to be calculated for non-uniform, distributed excitations while taking hydrodynamic flow/structural coupling effects into consideration. The power input was calculated using well known analytical models for the plate mechanical impedance and empirical models for the surface pressure cross-power spectral density and/or wave number-frequency spectral density. The Smol'yakov-Tkachenko model was used to estimate the fluctuating pressure field underneath turbulent boundary layer flows. The Corcos model was used to estimate the wall pressure field under non-uniform, separated-reattached flows. Experiments were performed in order to evaluate the energy flow model. A clamped plate installed in a quiet, low-speed wind tunnel was used. The wall pressure fluctuations, the plate vibration response, and the acoustic pressure radiated from the plate were measured. The energy flow analysis method was found to provide reasonably accurate predictions of the frequency-averaged transverse velocity response of the plate at high frequencies. The acoustic pressure radiated on the quiescent side of the plate was also predicted with comparable accuracy.
机译：能量流分析方法用于预测在湍流边界层下壁压力波动以及分离后的重新附着流所激发的板的结构振动响应和辐射声功率。该方法允许在考虑流体动力流动/结构耦合效应的同时，针对非均匀分布的激励计算空间平均能量密度响应。使用众所周知的用于板机械阻抗的分析模型和用于表面压力交叉功率谱密度和/或波数-频率谱密度的经验模型来计算功率输入。使用Smol'yakov-Tkachenko模型来估计湍流边界层流下方的脉动压力场。使用Corcos模型来估计非均匀分离分离附着流下的壁面压力场。为了评估能流模型进行了实验。使用安装在安静的低速风洞中的夹板。测量壁压力波动，板振动响应和从板辐射的声压。发现能量流分析方法可提供高频下板的频率平均横向速度响应的合理准确的预测。还可以以相当的精度预测辐射到板的静态侧的声压。

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