Abstract:

A slider-crank mechanism with multi-clearance was established based on the mechanical system dynamics analytical software ADAMS. In the process, the impact function theory was used to simulate contact and collision occurring in the clearance joints. The dynamic effects of flexible members and clearance joints on mechanical systems were studied in detail, and the Archard wear model was  employed to predict the wear of clearance joint.A finite element model of linkage was  established through ANSYS considering the linkage was flexible, and the first five modes of the linkage were exported into ADAMS to set up a rigid-flexible coupling model of slider crank mechanism with multi-clearance.The  simulation results show that the dynamic behavior of the slider-crank mechanism with clearances and flexible linkage is very close to the ideal mechanism.In the process that the crank moves for one cycle, the impact force in the clearance joint occurs in some special locations, the pin and bushing still keep a continuous contact in a large range of crank angle, and the wear result predicted is reduced.

Key words: clearance;slider-crank , mechanism;contact impact;flexible member;wear

摘要：

基于机械系统动力学分析软件ADAMS建立了含多间隙曲柄滑块机构的动力学模型，利用冲击函数理论模拟间隙处的接触碰撞作用，详细研究了构件柔性和铰链间隙对机构系统动力学特性的影响，并应用Archard磨损模型对间隙运动副的磨损进行了预测。当考虑杆件柔性时，应用ANSYS程序创建连杆的有限元模型，取连杆的前五阶模态导入ADAMS中建立含柔性连杆的多间隙机构动力学模型并进行动力学仿真计算，结果发现，考虑杆件柔性时的间隙机构系统动态行为在很大程度上趋于理想机构，在曲柄转动一个周期的过程中间隙运动副除在几个特定的位置处发生了较大的碰撞外，轴销与轴套均保持连续接触，且预测所得的磨损量也较小。

关键词: 间隙, 曲柄滑块机构, 接触碰撞, 构件柔性, 磨损