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传统一维方法计算消声器声学性能随频率增加误差加大,本文应用管道末端修正系数改善一维方法的计算结果。应用二维轴对称解析方法计算管道末端修正系数,研究结构因素和频率对修正系数的影响规律,研究表明修正系数随截面半径比增加而降低,随频率增加而增加,超过截止频率后修正系数无效。根据计算结果给出修正系数拟合公式并修正传统一维方法,应用一维修正方法计算膨胀腔消声器的传递损失并和实验结果、三维有限元结果进行比较,证明一维修正方法结果精度有明显提高。
The traditional one-dimensional method to calculate the acoustic performance of muffler increases with the increase of the error. In this paper, the calculation result of one-dimensional method is improved by using the pipe end correction coefficient. The two-dimensional axisymmetric analytical method is used to calculate the correction factor of the pipe end, and the influence of structural factors and frequency on the correction factor is studied. The results show that the correction factor decreases with the increase of the radius of cross section and increases with the increase of the frequency. . According to the calculation results, the correction coefficient fitting formula is given and the traditional one-dimensional method is modified. The one-dimensional correction method is used to calculate the transmission loss of the expansion chamber muffler and compared with the experimental results and the three-dimensional finite element results. improve.