中文摘要：

针对现阶段椭圆形消声器应用较广泛，而基于圆柱坐标系的传统二维分析法无法准确模拟椭圆形消声器声学特性的问题，引入椭圆柱坐标系推导得出适用于椭圆形消声器的三维分析法，并基于三维分析法对消声器声学性能进行了理论推导。在理论推导的基础上，进行试验与算例分析验证三维分析法的准确性，将二维分析法和三维分析法的计算结果与试验结果进行对比，并解释了两种方法误差产生的原因。对比结果表明，相比于二维分析法，三维分析法的理论模型更适用于椭圆形消声器，能够在全频率段内对消声器内声场分布进行较准确的计算，同时证明了多级消声器的消声效果要明显好于单级消声器，为将来消声器的选型计算以及参数优化提供了理论基础，并为未来消声器发展提供了一种优化方向。

英文摘要：

Nowadays the elliptic mufflers are more widely used in the automotive industry. A 3D analysis method, aiming at solving the problem that the traditional 2D analysis method based on cylindrical coordinates cannot make an accurate simulation for the acoustic characteristics of elliptic mufflers, is reached with the importing of elliptical cylindrical coordinates, and then the theoretical derivation is made based on the 3D analysis method. An experiment with example analysis is conducted based on the theory derivation, the computation results of 2D and 3D analysis method are compared with the experimental results, and the deviation of two methods are analyzed. The comparison results show that compared with 2D analysis method, the 3D analysis method builds a more suitable model for the analysis of elliptical muffler, and is more capable of making an accurate calculation for the acoustic field inside the muffler in the whole frequency range, and the multiply combined muffler shows a better acoustic attenuation performance than the single cavity one, thus providing not only the theory basis for the selection and calculation of mufflers, but also a direction of optimization for the development of mufflers.