基于LSDYNA的射流式液动锤回程动力 外传机构研究

Power external transmission mechanism in return stroke of the jet type fluid hammer based on LSDYNA

摘要:

设计一种改变冲击应力波在射流式液动锤内传播途径的结构，分析在不同传播途径中应力波衰减程度的改变，基于LSDYNA显式动力学分析方法，对冲锤回程阶段进行仿真分析，探究冲锤回程冲击在液动锤内两种不同传播途径的模型中射流元件受到的应力变化。研究表明，动力外传机构通过避免对缸体上部的刚性碰撞，能大大降低射流元件所受到的冲击应力，并且外传机构的几何参数对应力的衰减也有一定的影响。

关键词:液动锤;射流元件;动力外传机构;LSDYNA;冲击应力

Abstract:

A structure for changing the propagation ways of the impact stress wave in the jet type fluid hammer is designed, and analysis shows that the attenuation degree of the stress wave changes with different propagation ways. The simulation on the hammer returnstroke is analyzed based on LSDYNA. The stress change of the fluid element is studied when the hammer impact is propagated in two different ways in the return stroke of the jet type fluid hammer. The results show that the power external transmission mechanism can greatly reduce the impact stress acting on the fluidic element by avoiding the rigid collision on the upper part of the cylinder. Moreover, the geometric parameters of the external transmission mechanism also have some influence on the stress attenuation.

Key words:jet type fluid hammer; fluidic element; power external transmission mechanism; LSDYNA; impact stress