液压桩锤的动态冲击过程分析

Analysis of dynamic impact process of hydraulic pile hammer

为研究液压桩锤的工作特性,提高桩锤系统的抗冲击性能,分析了桩锤冲击过程中各组成部件的运动和受力状况。以振动学理论为基础,建立了系统的力学模型以及动力学微分方程;利用模态分析的方法求解该微分方程,得到了桩锤系统的振动规律,通过求导进一步获得了速度、加速度以及各部件之间的相互作用力随时间变化的规律;并应用相关软件对冲击过程进行了仿真分析,研究结果表明冲击过程中砧铁的加速度变化剧烈,应采取一定控制策略将波动控制在合理范围之内。

In order to study the operational characteristics of hydraulic pile hammer and improve the impact resistance of the system,the movement states and force-bearing states of various components during impact process were analyzed.Then the mechanical model and the dynamical differential equation of the system based on vibration theory were established.With modal analysis method,the differential equation was solved.After the vibration law of the system was obtained,the derivative method was applied for obtaining the variation law of velocity,acceleration and interaction force between components,then the impact process was simulated and analyzed with the related software.The results show that the change of acceleration of anvil is intense during impact process,and some control measures are needed to restrain the fluctuation.