2012, Volume 7, Issue 1
Frontiers of Mechanical Engineering >> 2012, Volume 7, Issue 1 doi: 10.1007/s11465-012-0310-y
On the improvement design of dynamic characteristics for the roller follower of a variable-speed plate cam mechanism
Department of Mechanical Engineering, Cheng Kung University, Tainan 70101, China
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Abstract
Without modifying the cam contour, a cam mechanism with a variable input speed trajectory offers an alternative solution to flexibly achieve kinematic and dynamic characteristics, and then decrease the follower’s residual vibration. Firstly, the speed trajectory of cam is derived by employing Bezier curve, and motion continuity conditions are investigated. Then the motion characteristics between the plate cam and its roller follower are derived. To analyze the residual vibration, a single degree of freedom dynamic model of the elastic cam-follower system is introduced. Based on the motion equation derived from the dynamic model, the residual vibration of the follower is yielded. The design procedure to improve the kinematic and dynamic motion characteristics is presented and two design examples with discussions are provided. Finally, the simulations of the kinematic and dynamic models by ADAMS are carried out and verified that the design models as well as the performances of the mechanism are feasible.
Keywords
cam mechanism ; variable input speed ; kinematic design ; dynamic design ; optimal design
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