机构运动副间隙被动控制研究

Passive Control Research on Mechanical Pair Clearance

将阶跃函数与牛顿二状态相结合 ,考虑曲柄非匀速运转 ,对含间隙平面连杆机构的副间分离与碰撞过程建立了动力学统一模型 ,利用该模型 ,引入粘弹性阻尼被动控制技术 ,通过算例分析了被动控制的效果。分析结果表明 ,在不改变机构基本参数的情况下将粘弹性材料引入到机构的间隙铰接处大大降低碰撞时引起的冲击效应 ,提高了机构运转的的稳定性 。

Combining Newton two state model with step function,a u nified dynamic model between separation and collision process for the linkage me chanism with clearance connections,and with variable rotating speed of the cran k was developed in the paper.By incorporating viscoelastic damper into this dyn amic model,the passive control effects were numerically analyzed through an exa mple.The analytical results indicate that incorporating viscoelastic damper in the joint may greatly reduced impact effects and improve the steady state perfo rmance with out changing basic structural parameters of the mechanism.Thus this study provides a new way for the con trol of the mechanism with clearances.