轮式装载机滚翻保护结构动态响应  

Dynamic response of rollover prevention system for wheel loader

作　　者：于向军[1,2] 王国强[1] 王继新[1] 唐小波[1] 胡季[1] 

机构地区：[1]吉林大学机械科学与工程学院,长春130022 [2]昆明学院自动控制与机械工程系,昆明650118

出　　处：《吉林大学学报（工学版）》2010年第5期1262-1267,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(50775095);'863'国家高技术研究发展计划项目(2007AA04Z126)

摘　　要：采用静态弹塑性非线性分析与实验室试验方法设计了一种大型轮式装载机滚翻保护结构(ROPS),建立了此ROPS的整车动态倾翻仿真模型。给定了倾翻的初始边界条件进行仿真。采用显式动态有限元法对9个整车倾翻典型工况中ROPS的动态响应进行了研究,获得了ROPS动态滚翻姿态、能量吸收、冲击力和塑性铰变形模式的若干规律。除坡面倾角45°、摩擦因子0.6的工况外,均未出现车辆围绕纵轴翻滚360°的情况,而是车体沿坡面下滑至水平面并与其碰撞。在坡面倾角不变的情况下,ROPS所受冲击力及其吸收的车体动能随摩擦因子增加而增大。在摩擦因子不变的情况下,ROPS所受冲击力及其吸收的车体动能随坡面倾角变化比较复杂。本文工作可为提出ROPS动态实验室试验方法与标准制定提供依据。A new rollover prevention system（ROPS） was designed for the heavy-duty wheel loader by static elastoplastic nonlinear analysis method and lab test technology. A whole loader model including ROPS was built for the dynamic rollover simulation. The initial boundary conditions of rollover were given to perform the simulation. Nine typical rollover cases were simulated by the dynamic explicit finite element method. The dynamic response characteristics of ROPS, such as the dynamic rollover posture, the energy absorption, the impact force as well as the deformation pattern of the plastic hinge were obtained during the simulation process. The loader slides along the slope and finally collides with the horizontal ground without rolling around its longitudinal axis by 360° except the case of slope angle 45° and friction factor 0.6. Under a constant slope both the impact force on ROPS and the kinetic energy absorbed by the loader increase along with going up of the friction factor. Under a constant friction factor, there is a complicated relation among the impact force and kinetic energy, and the slope angle. The obtained results can provide a basis for drafting the dynamic lab test procedure and standard for wheel loader ROPS.

关 键 词：机械设计 轮式装载机 滚翻保护结构 冲击力 能量吸收 变形模式 塑性铰 

分 类 号：TH243[机械工程—机械制造及自动化]