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基于工程机械悬臂液压弯钢管的工况载荷特征,提出一种悬臂液压弯钢管的结构力学计算方法。以悬臂弯钢管及弯钢管内液压油为整体研究对象进行载荷分析,确定设计载荷。对液压油作用下的弯钢管进行应力分析发现,液压压力产生的附加弯矩是影响弯钢管应力水平的主要因素。基于已确定的设计载荷,应用拓扑分析方法获得弯钢管加强板的优化骨架结构,在骨架结构、生产制造工艺基础上建立形状尺寸优化模型,获得弯钢管加强板的优化结构。优化后结构的关键点应力降低了39%,理论疲劳寿命增加1.6~4倍,优化方案已在新开发样机上应用。
Based on the working condition load characteristics of cantilever hydraulic bending steel pipe of construction machinery, a structural mechanics calculation method of cantilever hydraulic bending steel pipe is proposed. The cantilever bent pipe and the hydraulic oil in the bent pipe were used as the overall research object to carry out the load analysis to determine the design load. The stress analysis of the bent steel tube under the effect of hydraulic oil shows that the additional bending moment caused by the hydraulic pressure is the main factor that affects the stress level of the bent steel tube. Based on the determined design load, the optimal skeleton structure of the steel pipe stiffened plate is obtained by using the topology analysis method. Based on the skeleton structure and the manufacturing process, the optimization model of the shape and size is established, and the optimal structure of the steel pipe stiffener is obtained. The stress of the key point of the optimized structure is reduced by 39% and the theoretical fatigue life is increased by 1.6 ~ 4 times. The optimization scheme has been applied in the newly developed prototype.