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LS-DYNA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。
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 LS-DYNA.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.
作者
张鹏飞
程靖清
葛东
彭枧明
ZHANG Pengfei;CHENG Jingqing;GE Dong;PENG Jianming(College of Construction Engineering,Jilin University,Changchun Jilin 130026,China)
出处
《探矿工程（岩土钻掘工程）》
2019年第2期71-74,85,共5页
Exploration Engineering:Rock & Soil Drilling and Tunneling
基金
国土资源部公益性行业科研专项项目"干热岩快速钻井用高压高能射流式液动锤研究"(编号:201311112)
关键词
液动锤
射流元件
动力外传机构
LS-DYNA
冲击应力
jet type fluid hammer
fluidic element
power external transmission mechanism
LS-DYNA
impact stress
