基于CATIA的汽车三元催化转化器设计及性能分析

社会发展，汽车保有量迅速增加，随之而来汽车尾气造成的环境污染问题也日趋严重。三元催化转化技术是目前应用最广泛，效果也最显著的发动机尾气机外净化技术。三元催化转化器可以使发动机尾气中的有害排放物如CO、HC、NOx同时降低90%以上，使汽车尾气污染得到有效控制。

许多车辆在实际使用过程中，由于使用不当造成三元催化转化器早期失效、损坏，致使它失去了减排的作用并造成发动机故障。本文分析三元催化转化器的结构、性能的特点，研究车辆使用特性对三元催化转化器性能的影响。研究表明,要使三元催化转化器正常使用,应使用规定级别或以上的润滑油、高品质的无铅汽油，保持发动机机械方面良好的工作状态，发动机电控系统也必须正常，还有车辆不宜长时间怠速等。

随着我国汽车工业的快速发展和机动车拥有量的快速增长，汽车尾气污染给城市环境带来巨大的影响，而汽车尾气净化转化器对此有着巨大作用，本文综述了其发展过程，分析了不同情况下转化器对汽车尾气的转化情况，展示了汽车尾气转化器的发展前景。

关键词：汽车尾气；净化；转化器；

With the development of society, the quantity of automobile is increasing rapidly, and the environmental pollution caused by automobile exhaust is becoming more and more serious. Ternary catalytic conversion technology is the most widely used and the most remarkable engine exhaust purification technology. The ternary catalytic converter can reduce the harmful emission of engine exhaust such as COHCOHCN NOx by more than 90% at the same time, so that the vehicle exhaust pollution can be effectively controlled.

In the actual use of many vehicles, due to improper use of ternary catalytic converter early failure, damage, resulting in it lost the role of emission reduction and cause engine failure. In this paper, the structure and performance of the ternary catalytic converter are analyzed, and the influence of the vehicle characteristics on the performance of the ternary catalytic converter is studied. The results show that in order to make the ternary catalytic converter work normally, it is necessary to use lubricating oil of specified grade or above, high quality unleaded gasoline, maintain good working condition of engine machinery, and the electric control system of engine must also be normal. There are vehicles should not idle for a long time and so on.

With the rapid development of China's automobile industry and the rapid growth of vehicle ownership, automobile exhaust pollution has a great impact on the urban environment, and the automobile exhaust purifier has a great effect on it. This paper summarizes its development process. The transformation of automobile exhaust gas by converter under different conditions is analyzed, and the development prospect of automobile exhaust converter is presented.

Keywords:automobile exhaust; purification; converter;

摘要I

AbstractII

第1章绪论1

1.1研究背景及意义1

1.2国内外研究现状2

1.3软件的介绍6

1.3.1 abaqus软件介绍6

1.3.2 Hypermesh软件介绍6

1.3.3 Catia软件介绍7

1.4本文主要工作内容8

1.5本章小结8

第2章理论基础及原理9

2.1前言9

2.2模态分析基本理论介绍9

2.3模态分析的原理11

2.4本章小结12

第3章模型的建立13

3.1研究对象的介绍13

3.1.1三元催化转化器的组成13

3.1.2对三元催化转化器的要求14

3.2几何模型的简化14

3.3网格模型的建立15

3.4本章小结16

第4章三元催化转化器模态分析17

4.1前言17

4.2材料属性的赋予17

4.3自由模态的分析计算19

4.4约束模态的分析计算20

4.5共振分析23

4.6本章小结24

第5章总结与展望25

5.1总结25

5.2展望25

参考文献27

致谢29