重型商用车排气消声器设计(含CAD零件图装配图)

重型商用车排气消声器设计(含CAD零件图装配图)(任务书,开题报告,文献摘要,外文翻译,论文说明书14000字,CAD图7张)
摘要
近年来，我国发展速度很快，汽车也融入大众的生活。汽车数量的上升，引起一些问题，产生的噪声对人们的生活有影响，降噪成为汽车设计者的重要课题之一。世界各国都颁布了一系列的法规来对汽车的噪声进行控制，对汽车制造的技术提出了更高的要求。我国也紧跟国际脚步，出台了很多的规定，如GB16170-1996《汽车定置噪声限值》等。
本文首先介绍了消声器的一些理论知识和汽车噪声的产生机理，并且对消声器的各项评价指标进行了较为详细的论述，比较各类消声器的优劣，为本文选择合适设计方案打下理论基础。
本文介绍了GT-power软件各个模块的基本功能，并且阐述了软件仿真的基本原理。通过选用的发动机的基本参数，计算出了消声器参数，由此建立消声器三维图。通过GT-power的部分功能来构建传递损失和插入损失相关模型，并把设计的消声器模型带入计算，把结果比较，选择好的方案。
关键词：重型商用车；消声器；仿真；噪声

Abstract
In recent years,our country develops very fast, people pursue higher quality of life, more and more cars havebeen coming intoour life.The reduction of Noise has became an important issue for car designers.All countries in the world to enact a series of laws and regulations to control the noise of the car.And our country which followed the international trend as well, has issued a series of laws and regulations,such as "GB16170-1996 automobile noise limit","the GB1495-2002 car sped outside noise limits and measurement methods”, etc.
This paper firstly introduced the muffler of some theoretical knowledge and the mechanism of automobile noise, and then discussed the evaluation’s indexes of exhaust silencer in detail, and compared the advantages and disadvantages of all kinds of muffler, the design scheme in this paper, choosing appropriate to lay a theoretical basis.
This paper is introduce the basic function module of GT - power software, and expounds the basic principles of software simulation.The basic parameters of muffler is determined through the selection of basic parameters of the engine .The model of the muffler is built by the basic parameters of muffler.Transmission loss and insertion loss calculation model are established by GT - power software .Compared the pros and cons of each solution to determine the final plan..
Key Words:Heavy-duty commercial vehicle；Noise；Muffler；Simulation
 

目录
摘要    I
Abstract    II
第1章绪论    1
1.1研究背景    1
1.1.1汽车噪声的危害    1
1.1.2各国出台的汽车噪声法规    1
1.2消声器的国内外研究    2
       1.2.1国外研究现状.........................................................................................2
       1.2.2国内研究现状.........................................................................................2
1.3研究排气消声器的意义...................................................................................3
1.4本文的主要内容    3
1.5本章小结    4
第2章发动机排气噪声及消声器理论基础    5
2.1排气噪声发生机理及其频谱特性    5
2.1.1基频排气噪声    5
2.1.2气柱共振噪声    5
       2.1.3排气歧管处的气流吹气声.....................................................................5
2.1.4赫姆霍兹共振噪声.................................................................................6
2.1.5废气喷注和冲击噪声.............................................................................6
2.1.6排气管内壁处的摩擦及紊流噪声.........................................................7
2.1.7其他噪声.................................................................................................7
2.2消声器的分类    7
       2.2.1阻性消声器.............................................................................................7
2.2.2抗性消声器.............................................................................................7
2.2.3阻抗式消声器.........................................................................................8
2.3消声器的评价指标    8
2.3.1消声器的声学评价指标.........................................................................8
2.3.2空气动力性能评价指标.......................................................................11
2.3.3消声器的机械性能评价指标...............................................................12
2.4本章小结    12
第3章消声器模型的建立    13
3.1GT-Power软件的简介    13
3.1.1GT-Power软件概况    13
3.1.2软件的模拟仿真原理    13
3.2发动机基本参数    14
3.3消声器方案设计及模型的建立    15
3.3.1抗性消声器的设计    15
3.4本章小结    18
第4章消声器的仿真分析    19
4.1消声器的离散化模型    19
4.2消声器的传递损失模型的建立    20
4.3消声器插入损失模型的建立    24
4.4消声器材料    27
4.5本章小结    27
第5章总结与展望    28
5.1总结    28
5.2工作及展望    28
参考文献    29
致谢    30