重载夹持机构弹性动力学研究  

Kineto-elastodynamics research on heavy loading gripper

作　　者：何竞飞[1] 肖国柱[1] 邓华[1] 陈艳[1] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083

出　　处：《锻压技术》2012年第2期97-102,共6页Forging & Stamping Technology

基　　金：国家重点基础研究发展"973"规划资助项目"巨型重载操作装备的基础科学问题"(2006CB705400)

摘　　要：针对重载夹持机构在工作过程中存在弹性振动的情况,以压杆式夹持机构为研究对象,用五次埃尔米特多项式表示梁单元的横向位移,进一步用弹性动力分析-简化方法建立了良好反映重载夹持机构的质量矩阵、刚度矩阵及运动参数的有限元模型,得到系统的运动微分方程组,利用Newmark-β法求解其弹性位移并通过实验验证位移U1,U12,U15。结果显示:夹持机构的一阶固有频率随前臂转角β增大而增大,相应的最大锻件下偏角为0.74°;KES的弹性位移比KED的位移变化幅度减小;定性了解了摩擦力可以减少夹持机构振动的振幅,并可以延迟振动响应。In allusion to the existed elastic vibration of heavy loading gripper in work, the pressure columned gripper was taken as a research object, and the lateral displacement of beam element was represented in Eimilt polynomial, the finite element model was built in simplified method of elastic dynamic analysis including the mass matrix, stiffness ma- trix and motion parameters. Then the motion differential equations were built. The elastic displacement was calculated numerically in Newmark-β method, the displacement U1, U 12, U 15 were verified. The results show that the tenden- cy of the first order of inherent frequency becomes bigger as intersection angle of forearm β increases, the elastic dis- placement amplitude of Kineto-Elastostatic analysis is smaller than that of Kineto-Elastodynamic analysis and the largest drop angle was got as 0. 74°. It is qualitatively realized that the friction can make the heavy loading gripper＇s vi- bration amplitude becoming smaller and delay the vibration response.

关 键 词：有限元模型 弹性动力学 KED分析 准静态分析 摩擦力 

分 类 号：TH113[机械工程—机械设计及理论]