汽车消声器消声性能案例.doc

河 北 工 业 大 学 毕 业 论 文 作 者： 田赛龙 学 号： 100284 学 院： 机械工程学院 系(专业)： 车辆工程 题 目： 消声器消声性能分析 指导者： 武一民 教授 (姓 名) (专业技术职务) 评阅者： (姓 名) (专业技术职务) 2014年6月8日 毕业设计（论文）中文摘要 题 目 消声器消声性能分析 摘要： 汽车在我国的经济发展过程中承担着重要的角色，但其引发的噪声问题越来越引起关注。排气消声器的应用可有效解决这一问题。 本文在对该课题研究理论学习理解的基础上，分别使用一维传递矩阵法和三维有限元法对简单消声器进行数值仿真分析，通过对传递损失曲线的评价，得出有限元法的适用性。针对WP7发动机的性能参数要求，按照消声器设计原则，确定消声器的结构尺寸，并在UG里建立三维模型，导入到ANSYS里划分网格，，最后导入到LMS Virtual.Lab里面计算得到传递损失曲线，由图对该消声器性能进行评价。利用对消声器影响因素的分析结果，改进该消声器，最终确定的消声器在整个频率范围具有良好的消声效果，尤其是低频处，这点与该发动机的排气频谱是吻合的。 关键词： 消声器 排气噪声 传递损失 LMS Virtual.Lab 毕业设计（论文）外文摘要 Title Analysis of the Performance of Mufflers Abstract Automobile plays an important role in the process of economic development in our country, but the noise created by cars has caused more and more attention. Application of exhaust muffler can be an effective solution to this problem. In this paper, based on the understanding and study of the theory which will be needed , the paper uses one dimensional Transfer Matrix Method and the Finite Element Method for numerical simulation analysis of simple mufflers.Through the evaluation of the transmission loss curve, this paper comes to conclusion about the applicability of the Finite Element Method.According to the requirements of the performance parameters of WP7 engine , this paper determines the structure size of muffler in accordance with the muffler design principle, and then creates a three-dimensional model in UG. After that the model is imported into ANSYS for meshing.Finally, inside the LMS Virtual.Lab the transmission loss curve is calculated, and the muffler performance is evaluated by the graph. By using the result of factors on muffler performance which has been analyzed before , this paper improves the muffler.The muffler finally has good noise reduction effect i