歧管式催化转化器有限元模态分析及结构优化
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摘要
针对某型号歧管式催化转化器,利用Catia、Hypermesh和Nastran软件之间的接口,精确的对该歧管式催化转化器建立了有限元计算模型,对其进行了约束模态分析,并提取了前六阶固有频率和振型。分析结果表明,该歧管式催化转化器易与发动机发生共振。对其进行了结构优化,优化结果表明,优化方案能显著提高该歧管式催化转化器的固有频率,从而避开了发动机的激励频率。最后,对优化后的模型进行了强度校核,结果满足强度要求,为后续歧管式催化转化器的开发设计提供了理论依据。
Aiming at one certain type of manifold catalytic converter,a finite element calculation model of the manifold catalytic converter is founded and its constraint modal is analyzed accurately by the interface between Catia and Hypermesh and Nastran,and then the initial sixth order natural frequency and mode shapes are obtained. The analysis results indicate that resonance is easily occurred between the manifold catalytic converter and the engine. After structure optimization,the optimization results show that this optimization can significantly increase natural frequency of the manifold catalytic converter,thereby avoiding the excitation frequency of the engine. Finally,the strength of the optimized model is checked,the results meet the strength requirements and would provide the theoretical foundation for the follow-up development and design of manifold catalytic converter.
Aiming at one certain type of manifold catalytic converter,a finite element calculation model of the manifold catalytic converter is founded and its constraint modal is analyzed accurately by the interface between Catia and Hypermesh and Nastran,and then the initial sixth order natural frequency and mode shapes are obtained. The analysis results indicate that resonance is easily occurred between the manifold catalytic converter and the engine. After structure optimization,the optimization results show that this optimization can significantly increase natural frequency of the manifold catalytic converter,thereby avoiding the excitation frequency of the engine. Finally,the strength of the optimized model is checked,the results meet the strength requirements and would provide the theoretical foundation for the follow-up development and design of manifold catalytic converter.
引文
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[2]Lee C M,Park S T.Development of a Simple Numerical Method of the Exhaust System to Find Optimized Design Values[DO/OL].SAE,2000(1):117.
[3]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,2014,35(2):102-106.(Lei Gang,Hu Peng,Liu Sheng-kun.Modal analysis and hook location optimization of passenger car exhaust system[J].Chinese Internal Combustion Engine Engineering,2014,35(2):102-106.)
[4]宗德媛.汽油机歧管式催化转化器动态特性分析[D].重庆:重庆大学,2012.(Zong De-yuan.Dynanic characteristics simulation of gasoline engine manifold catalytic converter[D].Chongqing:Chongqing University,2012.)
[5]傅志方,华宏星.模态分析理论与应用[M].上海:上海交通大学出版社,2000.(Fu Zhi-fang,Hua Hong-xing.Modal Analysis Theory and Application[M].Shanghai:Shanghai Jiaotong University Press,2000.)
[6]雷刚,胡鹏,李灿.三轮摩托车排气系统模态分析及挂钩位置优化[J].现代制造工程,2014(4):48-51.(Lei Gang,Hu Peng,Li Can.The modal analysis and hook location optimization of a motor tricycle exhaust system[J].Modern Manufacturing Engineering,2014(4):48-51.)
[7]陈剑,穆国宝,张丰利.汽车NVH正向设计中的系统模态匹配策略研究[J].汽车工程,2010,32(5):369-372.(Chen Jian,Mu Guo-bao,Zhang Feng-li.A study on the strategy for modal matching between systems in vehicle NVH Top-down design[J].Automotive Engineering,2010,32(5):369-372.)
[8]庞剑,谌刚,何华.汽车噪声与振动理论与应用[M].北京:北京理工大学出版社,2006.(Pang Jian,Chen Gang,He Hua.Automotive Noise and Vibration Theory and Applications[M].Beijing:Beijing Institute of Technology Press,2006.)
[9]徐献阳,李松波,张建武.某轿车排气系统振动特性仿真及优化[J].设计与研究—机械,2008,35(3):13-14.(Xu Xian-yang,Li Song-bo,Zhang Jian-wu.Simulation and optimization for vehicle exhaust system of vibration performance[J].Design and Research-Machine,2008,35(3):13-14.)
[10]张旭升,颜伏伍,袁伟.汽油机歧管式催化转化器设计研究[J].汽车工程,2008,30(3):264-267.(Zhang Xu-sheng,Yan Fu-wu,Yuan Wei.Design and research of manifold catalytic converter of gasoline engine[J].Automotive Engineering,2008,30(3):264-267.)