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以非线性有限元技术为理论基础,根据标准试验中要求的约束和加载方式,建立翻车保护结构(ROPS)的非线性有限元分析模型。通过Nastran计算求解,同时对比试验中破坏结构的具体情况,最终找到ROPS首次试验失败的根本原因。以此为依据,在不影响原有装配关系的前提下,对老结构进行改进。对改进后的结构再次建立有限元模型并进行分析,结果发现新结构的各种性能都得到明显的改善。改进后的ROPS顺利通过符合国际标准要求的土方机械翻车保护装置实验室试验。
Based on the nonlinear finite element method, a nonlinear finite element analysis model of rollover protection structure (ROPS) is established according to the constraints and loading methods required in the standard test. Calculated by Nastran calculation, at the same time comparing the specific conditions of the damaged structure in the test, and finally finding the root cause of the failure of the first ROPS test. Based on this, the old structure can be improved without affecting the original assembly relationship. Once again, the finite element model was established and analyzed for the improved structure. The results showed that the various properties of the new structure were significantly improved. The improved ROPS successfully passed the laboratory test of the overturning protection device for earthmoving machinery meeting the requirements of international standards.