弹性连杆机构冲击副润滑特性研究

The Lubricated Behaviors Investigation of Impact Pairs in the Elastic Linkage Mechanism

弹性机构铰接副处过大间隙的存在将严重地影响了机器的动态性能。正因如此 ,采用间隙机构中常用的牛顿二阶段运动模型 ,引入两套广义坐标 ,对含间隙弹性平面连杆机构的副间分离与碰撞过程建立比较简洁易懂且全面反映间隙铰动态特性的动力学模型 ,计入了刚弹耦合作用及间隙对杆件弹性变形的影响 ,并考虑曲柄非匀速运转情况 ,利用该模型 ,引入挤压油膜阻尼器被动控制技术 ,通过算例 ,对比分析了理想铰、间隙铰、挤压油膜铰对弹性机构的动态特性的影响。分析结果表明 ,挤压油膜阻尼器被动控制间隙机构是可行的。因此 ,为含间隙机构未来领域的研究提供了一个新思路。

The excessive pair clearnace can introduce harmful vibration and noise and seriously hamper the machine dynamic performance.For the reason,in terms of Newton two state model,through choosing two sets of generalized coordinates this paper develops a concise dynamic model which can generally reflect the dynamic behaviors of clearance joints for the contact and loss of contact processes in the elastic linkage mechanism.The rotate speed of crank is assumed to be non constant and the squeeze film lubricated joint is induced.Illustrative examples are shown to compare dynamic behaviors of idealized,clearanced,squeeze film lubricated mechanisms.The analytical results indicate that squeeze film damper passive control for the clearanced mechanism is feasible.Thus this study can provide a new idea for the future investigation of the clearanced elastic mechanism.