论文部分内容阅读
发展了一种基于有限元和边界元耦合方法的管道进口声传播及声辐射计算模型.该模型将整个声场分为内部有限域和外部无界域,分别用有限元和边界元方法求解控制方程,在两者之间的界面上使用具有物理意义的声阻抗参数进行匹配,并通过一种快速迭代方法实现全声场求解.这种迭代方法可以保证有限元刚度矩阵等带宽以及对称的特性不被破坏,有助于提高计算效率.该模型先得到了Levine-Schwinger标准解的检验,进而在无流动情况下对于简化的航发短舱进口管道模型进行了噪声辐射现象的数值模拟,最后基于计算结果分析了声衬对远场声辐射的影响.
A model of acoustic propagation and acoustic radiation of pipe inlet based on coupled FEM and boundary element method is developed. The whole acoustic field is divided into internal finite field and external unbounded field. The governing equations are solved by finite element method and boundary element method, respectively. The acoustic impedance parameters with physical significance are matched at the interface between the two, and the whole acoustic field is solved by a fast iterative method, which can ensure the bandwidth and the symmetrical properties of the finite element stiffness matrix are not damaged , Which helps to improve the computational efficiency.The model is first tested by the Levine-Schwinger standard solution, and then the numerical simulation of the noise radiation phenomenon of a simplified aeronautical nacelle import pipeline model is conducted under no-flow conditions. Finally, based on the calculation results The effect of acoustic lining on far-field acoustic radiation was analyzed.