基于统计波叠加法的流激平板声辐射数值算法研究

Research on the numerical algorithm of flow-induced plate sound radiation based on a statistical wave superposition method

结构流激噪声是一个多场耦合的复杂问题,以平板流激噪声为例,提出一种预报流激结构噪声的统计波叠加方法,该方法首先利用有限元耦合波叠加方法获取系统传递函数矩阵,并参考随机声振理论半经验公式构建湍流脉动压力激励谱矩阵以获得流激噪声。该研究给出了预报平板流激噪声的详细流程,通过与统计有限元法以及统计边界元法等传统理论计算结果进行比对,指出了该算法的准确性和高效性,最后给出了影响统计波叠加法计算精度的关键参数。该研究成果为结构振动噪声控制提供了预报方法和技术支撑。

Structural flow-induced noise is a complex problem involving multiple fields.In this paper,taking plate flow-induced noise as an example,a statistical wave superposition method for predicting flow-induced structural noise is proposed.This method first uses the finite element coupled wave superposition method to obtain the system transfer function matrix,and then refers to the semi-empirical formula of random sound and vibration theory to construct the turbulent fluctuating pressure excitation spectrum matrix to obtain the flow-induced noise.The paper provides a detailed process for predicting plate flow-induced noise and compares it with the results of traditional theoretical calculations,such as the statistical finite element method and statistical boundary element method,to demonstrate the accuracy and efficiency of the algorithm.Finally,the key parameters that affect the calculation accuracy of the statistical wave superposition method are presented.The research results of this paper provide a prediction method and technical support for structural vibration noise control.