Research on dynamic characteristics of transient deployment mechanism with translational clearance joint under large eccentric load

Abstract In this paper, in order to obtain the influence of translational clearance joint on the dynamic characteristics transient of deployment mechanism underload large unbalance, the contact state and relative motion of slider and guide rail are firstly analyzed to illustrate the dynamics of slider and guide rail during the transient motion of the multi-output mechanism under eccentric load. The relative position change and the existing contact form; and based on the existing contact force model, an improved contact force model is proposed. The improved model is sensitive to the material recovery coefficient, the clearance size between the slider and the guide rail, and the initial collision velocity. A certain accuracy is still maintained when the contact collision speed is high; then, based on the improved contact force model, a dynamic model of a large eccentric load transient mechanism with translational clearance joint is established, and the dynamic characteristics are analyzed for it, compared with the ideal state, the transient output angular acceleration oscillates violently, the maximum value is 1.5 times of the ideal state. The transient impact contact force has a sudden increase, and the maximum value is 20 times of the ideal state; and then obtain the influence law of the transient motion speed, eccentric load, the clearance size and contact stiffness on the transient dynamic characteristics of transient deployment mechanism under large eccentric load through calculation. Finally, it is verified by experiments that under a certain gap size, the faster the transient motion speed, the more severe the output angular acceleration oscillation of the mechanism. The law is used to optimization design of similar transient mechanisms with moving pairs and partial load.