排气系统的优化设计与振动特性分析
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摘要
为了提高某排气系统的性能,实施了排气系统特性分析与确定性优化。利用Catia建立三维模型,运用Hypermesh进行网格划分,模态求解由Ansys完成。在Nastran中利用综合模态节点法进行了挂钩位置优化,并利用软件Isight进行了确定性优化。对优化过后的系统进行约束模态求解,并计算优化前后排气系统的静动态性能。通过验证对比,约束模态振型更为合理,吊耳静位移有所增加,但吊耳反力峰值减小18.5 N,低频段反力曲线更为平顺,动态性能更加优秀。此优化流程被证明对提高排气系统NVH性能是有效的。
To improve the performance of exhaust system,this paper conducts its characteristic analysis and certainty optimization,builds the 3 D model by Catia and a FEM model by Hypermesh,does the calculation of the free modes by Anasys,uses the method of synthesis modal dots in Nastran to optimaze the hanger position does the certainty optimization by the software Isight,and then,works out a solution for the restrained modes and calculates the statics and dynamic performance of the optimized system. By verification and comparison,the modal mode of vibration is more appropriate,the static displacement of the hanger in creases,the peak of its counter-force is reduced by 18.5 N,under the low frequency section,the counter-force curve is more smooth,so the dynamic performance is better. It is proved that the optimization method can be used to improve the system's NVH performance.
To improve the performance of exhaust system,this paper conducts its characteristic analysis and certainty optimization,builds the 3 D model by Catia and a FEM model by Hypermesh,does the calculation of the free modes by Anasys,uses the method of synthesis modal dots in Nastran to optimaze the hanger position does the certainty optimization by the software Isight,and then,works out a solution for the restrained modes and calculates the statics and dynamic performance of the optimized system. By verification and comparison,the modal mode of vibration is more appropriate,the static displacement of the hanger in creases,the peak of its counter-force is reduced by 18.5 N,under the low frequency section,the counter-force curve is more smooth,so the dynamic performance is better. It is proved that the optimization method can be used to improve the system's NVH performance.
引文
[1]李朕,彭江华,杨国雄.基于Hypermesh二次开发的排气系统分析[C].Altair2009Hyperworks技术大会论文集,2009:1-6.
[2]雷刚,胡鹏,刘圣坤.汽车排气系统模态分析及挂钩位置优化[J].内燃机工程,2014(2):102-106.
[3]张修路.汽车排气系统悬挂点位置的设计及结构优化[D].吉林:吉林大学,2014.
[4]董志新.某轿车排气系统结构性能与优化方法研究[D].广州:华南理工大学,2014.
[5]蒋苗苗.某乘用车排气系统振动性能优化设计[D].广州:华南理工大学,2015.
[6]徐献阳.车辆排气系统的振动模态分析及优化[D].上海:上海交通大学,2007.
[7]田静.乘用车排气系统悬挂位置设计及隔振控制研究[D].武汉:武汉理工大学,2011.
[8]刘名.排气系统振动特性与优化设计[D].南京:南京航空航天大学,2009.
[9]庞剑,谌刚,何华.汽车噪声与振动[M].北京:北京理工大学出版社,2006.
[2]雷刚,胡鹏,刘圣坤.汽车排气系统模态分析及挂钩位置优化[J].内燃机工程,2014(2):102-106.
[3]张修路.汽车排气系统悬挂点位置的设计及结构优化[D].吉林:吉林大学,2014.
[4]董志新.某轿车排气系统结构性能与优化方法研究[D].广州:华南理工大学,2014.
[5]蒋苗苗.某乘用车排气系统振动性能优化设计[D].广州:华南理工大学,2015.
[6]徐献阳.车辆排气系统的振动模态分析及优化[D].上海:上海交通大学,2007.
[7]田静.乘用车排气系统悬挂位置设计及隔振控制研究[D].武汉:武汉理工大学,2011.
[8]刘名.排气系统振动特性与优化设计[D].南京:南京航空航天大学,2009.
[9]庞剑,谌刚,何华.汽车噪声与振动[M].北京:北京理工大学出版社,2006.