基于CATIA和ANSYS的可伸缩车车架强度仿真分析

Scalable Vehicle Frame Strength Simulation Analysis Based on CATIA and ANSYS

根据传统经验设计方法,设计一款具备底盘伸缩功能、适用于城市短距离行驶电动汽车的非承载式车架。为使设计的小型可伸缩车车架达到安全需求,参照车架正常工作环境,对其结构进行了强度和刚度有限元分析。在CATIA软件中对该小型可伸缩车车架进行三维模型的建立,导入ANSYS软件中进行三维模型的修正和网格划分;对车架运用有限元分析方法进行刚度和强度等静力学性能分析以及模态分析。选取弯曲和扭转工况,对车架有限元模型添加相应的载荷和约束,选取适当的载荷系数,分析车架变形分布和应力分布。对所设计的小型可伸缩车架进行模态分析,提取其前6阶固有频率及模态分析。结果表明:所设计的小型可伸缩车车架在伸长和收缩状态都能满足安全需求,符合设计要求。

According to traditional empirical design methods,a non-load-bearing chassis with adjustable chassis function suitable for urban short-distance electric vehicles is achieved.In order to meet the safety requirements for the design of a small adjustable chassis,finite element analysis is performed on its structure for strength and stiffness based on the normal working environment of the chassis.The three-dimensional model of the small adjustable chassis is established in CATIA software,and have be import into ANSYS software for three-dimensional model modification and mesh division;finite element analysis is performed on the chassis using the static mechanical properties analysis and modal analysis methods for stiffness and strength.Bending and torsion conditions are selected,and corresponding loads and constraints are added to the finite element model of the chassis.Proper load coefficients are chosen to analyze the deformation and stress distribution of the chassis.Modal analysis is performed on the designed small adjustable chassis to extract the first six natural frequencies and modal analysis results.The result shows that the designed small adjustable chassis could meet the safety requirements in both the elongation and contraction states,and meet the design requirements.