Dynamics Analysis And Experimental Study Of A Hinge Mechanism With Clearance

Multi-body system with clearance hinge mechanism is a complex system connected by multiple rigid or flexible bodies through clearance hinge,which is applied in the field of medical machinery equipment,aerospace engineering,vehicle mechanical engineering,etc.However,the clearance of the hinge will lead to the impact vibration of the mechanism and the wear of the surface of the hinge contact pair,which will affect the movement accuracy,stability and service life of the mechanical system,and even lead to serious failure or scrap of the system.Therefore,the study of multibody system with clearance hinge can analyze the dynamic influence law of clearance hinge on clearance hinge multi-body system,and provide reference for the optimization design of clearance hinge mechanism.To solve the above problems,this paper established a description model of clearance hinge,analyzed the characteristics of normal contact force model and tangential friction model,and based on the clearance rotary hinge mechanism model,established a mathematical model of clearance hinge crank slider with flexible connecting rod,and adopted Adams software and Patran software co-simulation.Hinge of slider-crank mechanism with clearance for 3 d model,the modal analysis was carried out on the rigid rod,gain its natural frequencies,and further discuss the hinge contact place pair place different radial clearance value,connecting rod of different materials,different materials of hinge deputy vice and hinge contact surface coating selflubrication of Mo S2 coating conditions on the influence law of hinge mechanism with clearance dynamic response characteristics,The results show that smaller radial clearance value of contact pair,smaller natural frequency of connecting rod,smaller stiffness and friction coefficient of contact pair material and Mo S2 coating can alleviate the impact and impact at the hinge of crank slider mechanism and improve the stability of mechanism.In addition,the building of hinge with clearance slider-crank impact test-bed,consistent with the numerical simulation tests have been carried out,using the signal sampling device slider acceleration and displacement information,compared with the results of numerical simulation,experimental results and numerical simulation results change trend is relatively consistent,verified by the correctness of the dynamic model and the corresponding numerical simulation results.In addition,the wear test of the hinge contact surface of crank slider mechanism with or without self-lubricating Mo S2 coating was also carried out.The wear results show that the impact vibration of the mechanism can be alleviated by adding Mo S2 coating to the hinge contact pair,and the wear amount of the hinge is greatly reduced.