某纯电动汽车扭力梁式后悬架强度分析与优化数值模拟

Numerical Simulation Analysis and Optimization of Beam Rear Suspension Torsion Strength of a Pure Electric Vehicle

为了分析某纯电动汽车后悬架的强度,应用有限元法对某款纯电动汽车扭力梁式后悬架进行了静力学分析,获得了静止、制动、转向、单边悬空4种典型工况下应力分布情况。对原有结构中扭转横梁和弹簧座设计薄弱环节进行了结构优化。结构优化后,显著改善了4种典型工况下的应力分布情况,达到优化目标。同时,对后悬架进行了约束模态分析。结果显示,后悬架的固有频率有效避开了激振频率范围,从而避免共振和疲劳损坏,为准确预测和评估后悬架设计阶段悬架的整体性能提供了数据参考。

In order to analyze the strength of a pure electric vehicle rear suspension, static analysis of the torsion beam rear suspension of a pure electric vehicle was carried out by finite element method, the stress distribution of four typical working eonditions such as static, braking, steering and unilateral suspension were obtained. The weak link design of the twisted beam and spring seat in the original structure was optimized. After optimization, stress distribution under four typical working conditions was improved obviously, and optimization target was achieved. At the same time, modal analysis of the rear suspension was carried out, and the results show that the natural frequency of the rear suspension effectively avoids the excitation frequency range, thus avoiding resonance and fatigue damage, which provides the basis for accurate and efficient prediction of the suspension performance in design stage of the rear suspension.