【摘要】 在利用三维有限元法研究简单结构的消声器的声学消声性能基础上,对于复杂结构的消声器进行了声学性能预测。数值仿真结果和试验结果的良好吻合表明,三维有限元法适合于研究消声器的声学消声性能,具有相当高的精度。同时利用消声器内部的压力云图研究消声器结构对于声波传播的影响,并且应用三维有限元法进一步研究了穿孔率和穿孔管长度对于复杂结构的汽车排气消声器的声学消声性能的影响。更多还原

【Abstract】 The noise attenuation characteristics of complex muffler are investigated by 3D finite element analysis based on the study on simple muffler.The good agreement of numerical results with test data verifies the applicability and accuracy of the finite element analysis.Maps of sound pressure level distribution inside the mufflers are given and used for studying the effect of muffler structure on the propagation of acoustic wave.And the effect of perforation length and porosity on the noise attenuation performance of complex automotive exhaust muffler is further investigated in detail.更多还原