【作者】 毕嵘；

【导师】 刘正士；

【作者基本信息】 合肥工业大学 ， 制冷与低温工程， 2007， 硕士

【摘要】 汽车发动机进排气噪声是汽车噪声的主要噪声源之一，控制进排气噪声最有效的途径是在进排气系统上使用消声器。设计高消声性能、低阻力损失的消声器已成为目前进排气噪声控制的重要课题。复杂消声器是由若干基本消声结构组合而成。本文以大型有限元软件ANSYS、专业声学软件SYSNOISE和流体动力学软件FLUENT为平台，综合运用有限元法、有限体积法、模态分析的方法对基本消声单元的声学性能、空气动力性能以及动态特性进行数值仿真计算与分析，分析不同结构参数对消声器性能的影响。在此基础上，针对某一轻型卡车所装配的消声器的声场及流场进行计算，并对该款消声器进行改进设计与分析。结果表明：通过改进设计使消声器的主要性能与原结构相比有所改善。本文对进排气系统的消声器进行数值仿真分析，为消声器的设计提供了参考，并且为消声器的改进提供了新的思路与方法，对提高消声器的设计与分析水平具有重要的指导意义。更多还原

【Abstract】 The intake and exhaust noise of automotive engine is one of main noise sources of automobile noise. The most effective measure to control intake and exhaust noise is using muffler in intake and exhaust system. Designing a muffler with high anechoic performance and low resistance loss has become an important subject on intake and exhaust noise control.A complex muffler consists of several basic anechoic constructions. With the large-scale finite element software ANSYS, the professional acoustic software SYSNOISE and the fluid dynamic software FLUENT, the computation and analysis of numerical simulation of acoustic performance, aerodynamic performance and dynamic characteristics of basic anechoic units are carried out in this thesis through a comprehensive application of the finite element method, finite volume method and modal analysis. Then the influence of different structural parameters on the performance of muffler is further analyzed.Based on those, the paper makes analysis on the acoustic field and the flow field of muffler mounted on a light truck, then it brings forward and analyzes an improved design. The results show that the major performances of the muffler in the improved design are enhanced compared with the original construction.The numerical simulation of intake and exhaust muffler in this thesis can provide reference and new method for muffler design. It is of important instructional significance for improving the design and analysis of muffler.更多还原