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针对大型凹底平车大底架结构选型问题进行了研究，并对大底架关键部位弯角处进行了方案优化，评出了结构优化方案，同时，提出了大底架结构的稳定性分析问题
Aiming at the selection of the large undercarriage large car chassis structure, the optimization of the program is carried out on the corners of the large carcass, and the structural optimization scheme is evaluated. At the same time, the stability of the large undercarriage structure analyse problem