受限颗粒体对运动副摩擦力-速度关系的影响研究

Study on the influence of confined particles on friction-velocity relationship of kinematic pair

在运动过程中受粉尘、碎屑等颗粒的影响,运动副动力学特性会产生复杂变化。针对此类问题,文章开展了弹簧-滑块-传送带摩擦实验,通过将二氧化硅、金刚石、氧化铁等受限颗粒体引入铝质滑块-橡胶传送带,探究摩擦力-速度关系、摩擦非线性-速度关系的变化。研究发现:不同载荷、颗粒材料、颗粒粒径对速度摩擦力-速度等关系会产生不同影响;随着载荷增加,滑块的摩擦力均值和标准差随之增大;加入二氧化硅颗粒后,摩擦力均值呈现减小趋势,摩擦力标准差呈现先减小后增大的趋势;加入金刚石、氧化铁颗粒后,摩擦力均值呈现增大趋势,摩擦力标准差呈现减小的趋势;随着粒径的增大,滑块受到的平均摩擦力及标准差呈现增大的趋势。该研究对含受限颗粒体的运动副的动力学特性有一定的指导意义。

Kinematic pair will be affected by dust,debris and other particles during motion,and its kinetic properties will undergo more complex changes.To address this problem,the spring-slider-conveyor belt friction experiment was carried out,and the changes of the friction-velocity relationship and friction nonlinearity-velocity relationship were investigated through the introduction of confined particles such as silica,diamond and iron oxide into the aluminum slider-rubber conveyor belt.It is found that different loads,particle materials and particle sizes have different effects on friction-velocity relationship.With the increase of the load,the mean friction and the standard deviation of the friction of the slider increase.After adding the silica particles,the mean friction tends to decrease,while the standard deviation of the friction tends to decrease first and then increase slightly.After adding diamond and iron oxide particles,the mean friction tends to increase,while the standard deviation of the friction tends to decrease.With the increase of particle size,the mean friction and the standard deviation of the friction of the slider tend to increase.This study has some implications for the kinetic properties of kinematic pairs containing confined particles.