新型三球销移动副的间隙模型研究

为了研究含间隙机构的动力学特性 ,首先要建立运动副的间隙模型。目前常用的几种间隙模型都存在一定的不足 ,不完全符合实际运动。针对这几种模型中存在的问题 ,基于弹性接触理论 ,考虑副元素的非线性特征 ,建立了非线性等效弹簧和阻尼器 ,并给出了运动副力学描述方程。结合三球销移动副的特殊结构 ,建立了该运动副提供的力约束方程。通过仿真计算和实验研究 ,两者具有很好的一致性 ,证明了该模型的合理性和实用性。研究结果为含间隙运动副机构的动力学研究提供了理论基础。

Modeling of tripod-ball sliding joint with clearance

A mathematic model of a joint with clearance is important for the dynamic study of the mechanisms. These kinds of passing model can not exactly coincide with the actual motion. In this paper focusing on the defects of these models, based on the elastic contact theory, the new nonlinear equivalent spring and dash pot were presented, and the equations were set up. Taking into consideration the special structure of the tripod ball sliding joint, a set of constraint equations was obtained. The theoretical and experimental results showed good agreement, so that it can be found that the model of joint with clearance presented here is competent. The analysis in this paper provides a valuable basis for the further dynamic study of mechanisms including joints with clearance.