某蓄电池支架开裂分析和优化

针对某车型蓄电池支架在路试过程中出现开裂的问题，利用有限元法对支架总成进行强度和模态分析，对开裂原因进行排查。分析结果表明支架总成1阶模态固有频率过低，且开裂位置存在较大的应变能集中，导致支架总成发生共振开裂。根据分析结果对蓄电池支架总成进行优化，其1阶模态固有频率明显提升，开裂处应变能集中情况显著改善。路试证明支架未再次发生开裂，优化后的支架总成满足车型开发要求。

Cracking analysis and optimization on storage battery bracket

As to the cracking of a vehicle storage battery bracket during road test, the strength and modal of bracket assembly are analyzed using finite element method, and the cracking reason is studied. The analyses results show that the natural frequency of the first order modal of bracket assembly is low, and the strain energy is amassed extensively in the cracking position, which leads to the resonance cracking of bracket assembly. The battery bracket assembly is optimized according to the analysis results. The natural frequencies of the first order modal of the bracket assembly are obviously increased, and the strain energy amassing in cracking position is improved significantly. The road test indicates that the bracket does not crack again, and the optimized bracket assembly meets the requirements of vehicle development.