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湍流边界层激励下平板辐射随机声场重建方法

Method for reconstructing random acoustic radiation from a plate under turbulent boundary layer excitation

  • 摘要: 提出了一种湍流边界层激励下板结构辐射的随机声场重建方法。对于无限大板辐射的均匀声场, 基于不相关壁面平面波和平面声全息模型重建了均匀随机声场, 该方法在未知板结构物性参数信息时实现了随机声场的精确重建; 对于简支板辐射的非均匀声场, 将随机声场分解为各个波数平面波激励下结构声响应叠加, 实现了随机声场的精确重建。数值仿真结果表明, 对于1.79%的测量噪声, 通过波数域滤波, 重建误差从61.67%降低为23.18%。研究结果呈现了TBL激励下结构声辐射规律, 可为结构减振降噪及振动非接触测量提供理论依据。

     

    Abstract: This study presents a method for reconstructing the stochastic sound field radiated by a plate structure under the excitation of a turbulent boundary layer (TBL). In the case of a homogeneous sound field radiated by an infinite plate, the homogeneous stochastic sound field is reconstructed based on uncorrelated wall plane waves and a plane acoustic holography model. This method achieves an accurate reconstruction of the random sound field without known material property information of the plate structure. For the non-homogeneous sound field radiated by a simply supported plate, the stochastic sound field is decomposed into a superposition of structural acoustic responses under excitation by plane waves of various wavenumbers, achieving an accurate reconstruction of the random sound field. Numerical simulation results indicate that the reconstruction error can be reduced from 61.67% to 23.18% by applying wavenumber domain filtering to mitigate the effect of a 1.79% measurement error. The results represent the spatial distribution of the stochastic sound pressure field under TBL excitation, providing a theoretical basis for structural vibration damping, noise reduction, and non-contact vibration measurements under TBL excitation.

     

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