车身焊点布置优化研究

Study on Optimization of Welding Spot Layout of Automobile Body

以某款车身为研究对象,对已有焊点布置进行拓扑优化,在保证车身综合性能条件下进一步减少焊点数量。首先建立弯曲工况、扭转工况和模态工况,分析其刚度、强度以及模态,然后利用拓扑优化对焊点进行优化布置。焊点拓扑优化以车身焊点体积最小为优化目标,以保证原有弯曲、扭转以及模态工况下的性能为约束条件,设计变量为焊点单元密度。最后,通过仿真对比验证基于拓扑优化车身焊点的优越性。结果表明,车身焊点数量由3841降到3786,减少了55个焊点,基于拓扑优化后的车身综合性能基本保持不变,有效降低了成本。

Taking a certain car body as the research object,the existing solder joint layout is topologically optimized to further reduce the number of solder joints while ensuring the overall performance of the car body.First,establish bending,torsion,and modal conditions,and analyze their stiffness,strength and modal.Then,use topology optimization to optimize the placement of solder joints.Topological optimization of solder joints takes the smallest body solder joint volume as the optimization goal,to ensure the performance of the original bending,torsion and modal working conditions as constraints,and the design variable is the density of the solder joint elements.Finally,the superiority of body welding points based on topology optimization is verified through simulation comparison.The results show that the number of body solder joints has been reduced from 3841 to 3786,which has reduced 55 solder joints.The overall body performance after topology optimization has remained basically unchanged,effectively reducing costs.