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ID:36683331
大小:3.95 MB
页数:77页
时间:2019-05-13
《消声器的数值仿真分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、吉林大学硕士学位论文提要发动机的排气噪声一直是汽车噪声的重要组成部分,该噪声的控制方法主要是加装排气消声器。以往的消声器设计主要根据设计者的经验和试验,这种方法的针对性差,而且设计周期长、成本耗费大。本文以DY110-9型跨骑式摩托车配装的消声器的数值仿真和改进设计为例,探索了一种消声器设计的新方法。本文首先设计了该消声器的动、静态测量实验,利用商用噪声分析软件SYSNOISE仿真计算了其消声性能,在实验验证的基础上,运用模态分析和声压分布图相结合的方法,深入分析了该消声器的消声性能,并结合长管道空气驻波的控制方法提出了几种切实可行的改进方案。此外,本文提出了用音乐
2、性作为噪声主观评价目标的新构想,并为此定义了新的频程划分方法。关键词:排气消声器,噪声、振动及声振粗糙度,传递损失,模态分析吉林大学硕士学位论文图表索引图,0声源示意图················,,········,·,·······,··、·,····,、,⋯⋯、,,二,,,,.,,.,二,,.,.,..12一1图..02一2声源隔声性能示意图玉图,0.2一3声源频响特性图,·,,,一孟图11.2一4数字式扫频信号示意图1图...22一51/3倍频程声谱图L图,21图2一6频谱图···········⋯⋯,,.1J图2一7A室实验设备图﹃.,j2一8B室实验
3、设备图1图3一1有限元简图·....................................................................................21图3一2边界元简图·,,·,····,··,···,···,···,···,·,·,·,·,·······,·,···,·,·········,·······,·······,一25图3一3边界元简图·..............................................................................,一25图4一
4、1简单扩展腔模型图·.........................................................................33图今4一自简单扩张腔实验与计算对比图·.....................................................33图气j950Hz时声压图··,··································,·····、···························一344一图4一42850Hz时声压图·........................
5、...................................................34图4一5迷宫式单扩张腔声压图···········‘··················...........................·一35图4一6迷宫式单扩张腔传递损失图·,·,··,,··,,,,·,,··,,,···,·,·,·,···,······,,····,··,·,一35图4一7渐扩式单扩张腔模型图···‘········,·······································,········⋯⋯35图4一8渐扩
6、式单扩张腔传递损失图·....................................................,一35图4一9赫尔姆霍茨共振腔模型图···‘·‘············‘···············‘····················⋯⋯36图4一10赫尔姆霍茨共振腔传递损失图,·,,·,·,···,,·,,·,·,·,·,·,·,·····,·,·,·,,·,,·,·,,,一36图4一111/4波长调谐器模型图·.........................................................
7、....·一37图4一121/4波长调谐器传递损失图·,·······,····、·,,····、·,,·······,·,·,···,·····,·,·····一37图4一131/2波长调谐器模型图·······························································⋯⋯38图4一141/2波长调谐器传递损失图·】···,·····,·,···,··,······,·········,···,·,·,·,·,·,·,·一38图1395一1消声器模型图,·⋯图239图5一消声器内部结构图40图5一3排气频谱
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