边界元法应用于抗性消声器消声特性的三维分析计算.使用平面四角形单元离散边界表面,对奇异积分采用极坐标变换法消除奇异性,在棱边角点处区分不同方向的质点振速.文中对具有错开进出口管的矩形膨胀腔消声器的传递损失进行了计算,并与一维理论、解析法及有限元法计算结果进行了比较. Boundary element method is applied to the three-dimensional analysis and calculation of the muffler characteristics of the resistant muffler. The plane boundary element is used to discretize the boundary surface, and the singularity is eliminated by the polar coordinate transformation method to eliminate the singularity. In this paper, the transmission loss of rectangular expansion muffler with staggered inlet and outlet tubes is calculated and compared with the results of one-dimensional theory, analytical method and finite element method.