摘要
首先建立某款商务车刚柔耦合多体动力学模型,并对其悬架系统进行分析和验证,然后构建耐久性虚拟路面作为激励对整车模型进行虚拟试验,以获取车身边界动态载荷,最后利用静态叠加法算得车身结构的应力响应,并采用基于寿命的安全因子法对车身结构进行疲劳寿命预测,重点对路试开裂的后摆臂支座进行疲劳分析和结构优化。结果表明,基于寿命的安全因子分析法能更直观地分析结构的疲劳损伤状态。
Firstly,the rigid-flexible coupling multi-body dynamics model for a multi-purpose vehicle is built and its suspension system is analyzed with the model validated.Then a durability virtual road is constructed as the excitation to vehicle model and a virtual test is performed with the dynamic boundary loads of vehicle body obtained.Finally static superposition method is used to get the stress responses of body structure,and the fatigue life of body structure is predicted by life-based safety factor analysis with the focus put on the fatigue analysis and structural optimization of rear swing arm pedestal in which cracks appear in durability test.The results indicate that lifebased safety factor analysis can more intuitively analyze the fatigue damage state of structures.
出处
《汽车工程》
EI
CSCD
北大核心
2014年第3期362-367,共6页
Automotive Engineering
关键词
车身结构
刚柔耦合
疲劳寿命预测
安全因子
car body structure
rigid-flexible coupling
fatigue life prediction
safety factor
