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运用ANSYS/Workbench平台建立自行走剪叉式高空作业平台剪叉臂的有限元模型,对剪叉臂进行静力学分析,用名义应力法估算剪叉臂的疲劳寿命。结论:剪叉臂在起升初始位置和起升最高位置两种极限位置时,起升初始位置时所受应力最大,最大应力发生区域在剪叉式伸展结构最下层靠近升降液压缸支腿的铰接孔处,说明升降液压缸的驱动力对剪叉臂强度影响较大,且起升初始位置时升降液压缸的驱动力比起升过程中其它位置时要大。剪叉臂的应力集中和最大疲劳损伤均出现在起升初始位置时剪叉臂相同的铰接孔处,说明应力集中对剪叉臂的疲劳寿命影响较大,同时也间接说明升降液压缸的驱动力对剪叉臂的疲劳寿命影响较大。
The finite element model of the scissor arm of the self-propelled scissors aerial work platform was established by ANSYS / Workbench platform. The static analysis of the scissor arm was carried out, and the fatigue life of the scissor arm was estimated by the nominal stress method. Conclusions: When the scissor arms are in two kinds of extreme positions, ie the initial position of lifting and the highest position of lifting, the stress is the highest when the initial position of lifting is reached. The maximum stress occurs in the lowest part of the scissor-type extension near the legs of the lifting cylinder Hinged hole, indicating that the lifting hydraulic cylinder driving force on the scissors arm strength greater, and lifting the initial position of the lifting cylinder driving force than the lifting process to be greater than other positions. The stress concentration and the maximum fatigue damage of the scissor arm occur at the same hinge hole of the scissor arm at the initial position of lifting, which shows that the stress concentration has a great influence on the fatigue life of the scissor arm and indirectly indicates the driving of the lifting cylinder Force on the scissors arm fatigue life greater impact.