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边界元法用于计算轴对称管道及消声器内部声场与管口声辐射问题.对内部域和外部域有效的边界积分方程由管口处的连续性条件来耦合.轴对称边界积分方程被简化为沿母线的积分.采用三节点二次等参元对具有外插进出口管的膨胀腔消声器的传递损失、厚壁圆管内外声场及圆直管的辐射阻抗进行了计算并与其它方法结果进行了比较.作为应用实例,文中对简单膨胀腔消声器的插入损失进行了计算.
Boundary element method is used to calculate the sound field inside the muffler and the sound field inside the muffler. The effective boundary integral equations for the inner and outer domains are coupled by the continuity condition at the nozzle. The axisymmetric boundary integral equation is simplified to Integral along the busbar. The transmission loss of the muffler with the inlet and outlet of the tube and the radiation impedance of the thick and thin circular tube inside and outside the acoustic field and the round straight tube are calculated by the second-order isoparameter of three-node method and are compared with the results of other methods As an application example, the insertion loss of the simple expansion chamber muffler was calculated.