冲击载荷作用下液压支架的力传递分析

为研究冲击载荷作用下液压支架的力传递特性，利用ADAMS仿真软件建立了液压支架的多体动力学模型。模型中将液压支架的立柱液压缸、平衡液压缸、顶梁、前连杆、后连杆以及掩护梁等效为弹性体，用预载荷模拟正常工作条件下的静载荷，用阶跃载荷模拟基本顶断裂或垮塌时对支架的冲击力。基于此数值仿真模型，计算分析了冲击载荷作用于顶梁不同位置时液压支架各铰接点的力传递系数和各铰接点力对冲击载荷作用位置的敏感度。结果表明：冲击载荷作用位置对液压支架各铰接点力传递特性的影响不同，各铰接点对冲击载荷作用位置的敏感度也不相同。这些计算结果对于液压支架的自适应控制和等强度设计具有重要意义。

A study on force transmission in a hydraulic support under impact loading on its canopy beam

To study the force transmission in a hydraulic support under impact loading,a multi-body dynamics model of hydraulic support was established by using ADAMS.Its column hydraulic cylinders,balancing hydraulic cylinder,canopy beam,front link,rear link and cover shield beam were modeled as elastic structures.A specified preloading was applied on the support to represent the static load under normal working conditions,and the impact force on the support caused by possible basic roof fracture or collapse was considered as a step load.Based on this numerical simulation model,the force transfer coefficient of the hinge point of hydraulic support was calculated considering that the impact loading was applied on the different locations of its canopy beam.Meanwhile,the sensitivity of the force of the hinge point to the positions of the impact loading was evaluated.The results show that the force transmissions of the hydraulic support via all hinge points vary with the positions of impact loading,and the sensitivity of the force to impact loading position is hinge point-dependent.The results are useful for the adaptive control and strength design of hydraulic supports.