用计算机几何技术求解平面机构动力学的方法  

Dynamics Analysis of Planar Mechanisms based on CAD Geometry Techniques

作　　者：张艳华[1] 杜秀菊[1] 陈立辉[1] 

机构地区：[1]河北师范大学机械系,河北石家庄050031

出　　处：《机械传动》2010年第4期57-60,63,共5页Journal of Mechanical Transmission

基　　金：河北省教育厅课题(Z2009128)

摘　　要：提出用计算机几何技术求解平面机构的动力学。采用CAD的几何约束、尺寸约束、尺寸方程和尺寸驱动等计算机几何技术,构造一些典型平面连杆模拟机构。给定输入件的驱动尺寸,确定输出件被驱动尺寸,求出各个杆件运动位姿和一些杆件之间相互位姿尺寸。根据实际工作载荷和机构特点,构造机构模拟力学分析模型,求出作用杆件关键联接铰点的载荷和输入件上的驱动载荷,利用CAD软件的记录功能,得到机构关键载荷数据曲线。计算机模拟结果表明,该方法不仅具有简捷直观、求解精度高和重复性好的优点,而且可以完成复杂机构和多自由度机构的动力分析,为机构的动力学分析提供更有效的工具。Based on CAD the geometric constraint and dimension driving techniques,a dynamics analysis approach for planar mechanism is presented.By using the geometric-constraint,dimension-constraint,dimension equation-constraint,and dimension driving in CAD software,some type of simulation planar mechanisms are created.The driving dimension of input linkage is given and modified,and the driven dimensions of output linkage are changed automatically.Based on actual work load and mechanism characteristics,simulation model for mechanical analysis is constructed,the load of hinge point and input-driven is found critical load data curve is attained by using the record function of CAD software.The results of computer simulation and fit equation prove that the geometric constraint and dimension driving mechanism simulation approach has not only fairly quick and straightforward,but also advantages of accuracy and repeatability.

关 键 词：机构动力学分析 计算机模拟 尺寸驱动 几何约束 

分 类 号：TH113[机械工程—机械设计及理论]