冲击载荷作用下液压支架立柱动态特性研究

Study on Dynamic Features of Leg Applied to Hydraulic Powered Support Under Bumping Load

根据液压支架立柱工作的实际工况,建立了液压支架立柱在冲击载荷作用下动态特性分析模型。通过有限元和光滑粒子流体动力学方法解决了液压支架立柱流固耦合、流体大变形等问题,实现了立柱在冲击载荷作用下动态响应的数值模拟,得出了立柱在冲击载荷下缸体的应力分布、活柱的最大退缩量、流体的压力场分布及整个冲击过程对地基的最大冲击力等核心技术参数。应用固液弹簧耦合理论和能量法,推导出了立柱固液耦合系统的等效刚度和立柱的冲击动载荷系数,进而从理论上对液压支架立柱在冲击载荷作用下的动态特性及对地基的最大冲击力进行了分析。理论分析结果与数值模拟结果相比在误差范围内具有一致性。此研究结果为液压支架立柱抗冲击性能试验装置的开发提供了参考数据。

According to the actual performances of the leg operation in the powered support, a dynamic features analysis model of the leg in the powered support was established under the impact load role. The finite element and smooth grains fluid dynamics method were applied to solve the fluid-solid coupling, high fluid deformation and other problems of the leg in the powered support. The dynamic responses numerical simulation of the leg under the impact load role was realized. The cylinder stress distribution of the leg, the max recession value of the piston and the fluid pressure field distribution under the impact load were obtained, including the max impact force and other key technical parameters of the full impact process to the foundation. The solid and fluid spring coupling theory and the energy method were ap- plied to derive the equivalent rigidity of the leg solid and fluid coupling system and the impact dynamic load parameters of the leg. Thus theoretically, the dynamic features of the powered support leg under the impact load role and the max impact force to the foundation were analyzed. In comparison with the theoretic analysis results and the numerical simulation results, there was a consistency within the error scope. The study results could provide related reference data to the development of the anti impact performances test device of the powered support leg.