直角柔性铰链平行四杆机构的导向位移分析  

Analysis of Guiding Displacement of Parallel Four-bar Mechanism with Right Angle Flexible Hinge

作　　者：叶果[1] 李威[1] 王禹桥[1] 杨雪峰[1] 

机构地区：[1]中国矿业大学机电工程学院,江苏徐州221116

出　　处：《中国矿业大学学报》2010年第2期254-258,共5页Journal of China University of Mining & Technology

基　　金：高等学校博士学科点专项科研基金项目(20095110012);江苏省研究生培养创新工程项目(CX09B-109Z)

摘　　要：为了实现对直角柔性铰链单平行四杆机构的精确定位,根据结构的对称性建立了导向位移分析的单支链模型,引入奇异函数法推导了直角柔性铰链单平行四杆机构的导向位移计算公式;利用ANSYS10.0软件对线切割加工的样件进行有限元仿真,分析了实验值与理论计算值及有限元仿真值之间存在误差的原因.结果表明,在弹性变形内,机构的导向位移与外力成近似线性关系;理论模型与有限元法所得结果相近,误差为1.64%,但与实验所得结果存在约5.76%的误差.机构的加工误差、材料的组织缺陷及加工过程中的加工硬化现象等因素都会使得实验值偏离理论值与仿真值.In order to realize the aecurate positioning of parallel four-bar mechanism with right angle flexible hinge, a branched chain model was proposed for analyzing the guiding displacement characteristics based on the symmetry of structure. A formula for calculating guiding displacement was derived using a singularity function. The finite element simulation for the sample piece processed by wire cutting was carried on using an ANASYS10.0. Errors between theoretical results, simulation results and experimental results were analyzed. The results show that the guiding displacement is roughly linear with the force within the limit of elastic deformation. The results obtained from theoretical model are similar to the reslts from simulation with an error of 1.64 %. The error between the results from theoretical model and experiments is about 5.76%. Experimental results may deviate from theoretical results and simulation resuits due to various factors, including machining error of the mechanism, structural defects of the material and work hardening behavior after machining.

关 键 词：平行四杆机构 奇异函数 导向位移 直角柔性铰链 有限元分析 

分 类 号：TP368.1[自动化与计算机技术—计算机系统结构] TP216[自动化与计算机技术—计算机科学与技术]