基于虚拟样机技术的含间隙转动铰建模方法

Dynamic Simulation and Modeling of Planar Revolute Joint with Clearance Based on Virtual Prototyping

对基于ADAMS的含间隙转动铰虚拟样机建模方法进行研究.利用无质量圆弧间的接触约束建立等效含间隙转动铰,采用Hertz弹性接触理论建立碰撞力模型,采用三次多项式近似的阶跃函数建立粘性阻尼模型,采用基于速度的阶跃函数建立摩擦力模型.通过一含多间隙转动铰曲柄摇杆机构的动力学仿真算例,分析不同连接处的含间隙转动铰元素之间的相对运动关系,并对三类常见运动副间隙模型的适用性进行了讨论.结果显示利用ADAMS进行动力学仿真是研究含多间隙转动铰机构的一种有效方法.

The virtual prototyping modeling method of revolute joints with clearance based on ADAMS is discussed in this paper. Equivalent revolute joints with clearance are modeled with a combination of planar joint and circle-circle contact pair. Elastic impact force function is established using Hertz Contacts Theory. Viscous damper is established using a step function with a cubic polynomial. Friction model is established using a step function based on the slip speed. An example is presented which shows the dynamic simulation of a crank-rocker mechanism with revolute clearance-joints. The applicability of three common kinds of clearance-joint models is evaluated according to the simulation of the relative movement between the elements of different joints. Our results show that ADAMS is a kind of effective method for dynamic simulation of the mechanism with revolute clearance -joints.