The clearance in a kinematic pair causes impact contact in joints of mechanisms. Rough contact surfaces of a kinematic pair can significantly affect dynamic characteristics of a machinery system with clearances. Aiming at structural features of a common revolute joint in mechanisms, an impact model considering energy loss, dynamic characteristics of rough contact surface and effects of contact surface morphology was established to analyze influence laws of impact velocity, restitution coefficient and roughness, etc. on the contact impact force. A crank-slider mechanism was taken as the study object to establish its dynamic model. The simulation results showed that with increase in impact velocity and restitution coefficient, impact force and impact deformation gradually increase, and impact duration shortens; with increase in microconvex roughness, impact force and impact deformation gradually decrease, and impact duration shortens; the smaller the clearance of the crank-slider mechanism, the less the impact force exerted on the slider, the higher the frequency of impact appearing in the kinematic pair; so the established model can be used to impove the impact force model, provide a reference for mechanism design and it is beneficial to engineering application.
Key words
Revolute joint clearance /
Contact model /
Rough surface contact /
Dynamic characteristics /
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References
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