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 3D 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.
作者
潘公宇
曹丹青
陈玉瑶
PAN Gongyu;CAO Danqing;CHEN Yuyao(School of Vehicle and Traffic Engineering,Jiangsu University,Zhenjiang 212023,China)
出处
《机械制造与自动化》
2018年第1期118-121,共4页
Machine Building & Automation
关键词
排气系统
自由模态
约束模态
挂钩位置优化
确定性优化
静动态性能
exhaust system
free modes
restrained modes
optimization of hange posifion
certainty optimization
static and dynamic performance
