摘要
为了减轻某后副车架的重量,首先基于后副车架有限元分析模型对其进行自由模态分析,分析结果表明其前两阶频率均处于其发动机激振频率之外,能够有效地避免其发生共振。模态实验结果表明其仿真值与测试值基本一致,因此其有限元模型及其分析结果具有较高的准确度。然后基于典型工况的受力分析,同时建立后悬架多体动力学模型,获取各个工况下各个外连点的载荷,并且据此对其进行强度分析,分析结果表明其极限工况下的最大应力均低于材料极限,满足强度要求。最后基于Isight集成优化平台对后副车架零部件的料厚进行多学科多目标优化分析,获得了料厚的最佳设计参数,分析结果表明优化之后其强度性能和模态性能基本保持不变,其重量减轻了17.1%,并且其轻量化方案也顺利通过了整车道路可靠性实验。
Aiming at reducing a rear frame weight,firstly,the rear subframe was free modal analysised based on rear frame finite element analysis model,the analysis results show that rear subframe first two orders frequency exceeding engine excitation frequency,so the resonance can be effectively avoided. The modal testing results show that the simulation value is consistent with the test value,so the rear subframe finite element model and its analysis results have high accuracy. Secondly,the external connecting points loadinig were obtained based on typical working conditions load analysis and builting the rear suspension multi-body dynamic model,the analysis results show that the limit condition maximum stress is lower than the material limit and it meets the strength requirement. Lastly,the rear subframe thickness were multi-disciplinary and multi-objective optimization analyzed based on Isight integrated optimization platform,the rear subframe thickness were obtained. The analysis results show that its strength performance and modal performance is basically unchanged after optimization,its weight is reducee by 17.1%,and its lightweight scheme has passed the vehicle reliability road test.
作者
钟自锋
ZHONG Zifeng(School of Transportation and Logistics, East China Jiaotong University, Nanchang 330013, China)
出处
《机械设计与研究》
CSCD
北大核心
2018年第5期177-182,共6页
Machine Design And Research
基金
江西省教育厅资助科学技术研究项目(170388)
关键词
后副车架
强度分析
模态分析
多学科
轻量化
rear subframe
strength analysis
modal analysis
multi-disciplinary
lightweight