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传递损失是消声器的固有特性,是评判消声器消声性能的重要因素。分别采用传递矩阵法,有限元法和实验分析法对扩张腔消声器传递损失进行研究。应用传递矩阵法对扩张腔消声器的传递损失进行了理论计算;应用COMSOL软件对扩张腔消声器进行了有限元仿真分析,并根据管道中声压的分布情况,说明扩张腔消声器的扩张腔体长度直接影响消声器的消声频率的大小。将实验测试得到的传递损失与理论计算的传递损失进行了比较分析,结果表明,有限元分析结果更接近实际结果,传递矩阵法仅仅适用于低频段噪声的消声研究中。
Transmission loss is the inherent characteristics of muffler, muffler muffler performance evaluation of an important factor. Transmission matrix method, finite element method and experimental analysis were respectively used to study the transmission loss of muffler in expansion chamber. The transmission loss of the muffler in the expansion chamber was theoretically calculated by using the transfer matrix method. The finite element simulation analysis of the muffler in the expansion chamber was performed by COMSOL software. The expansion cavity length of the muffler in the expansion chamber was directly described according to the distribution of sound pressure in the pipe Affect the muffler muffler frequency of the size. The experimental transmission loss and theoretical transmission loss are compared. The results show that the finite element analysis results are closer to the actual results. The transfer matrix method is only suitable for the study of noise cancellation in low frequency band.