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.
Corresponding Author(s):
YAN Hong Sen,Email:hsyan@mail.ncku.edu.tw
引用本文:
. On the improvement design of dynamic characteristics for the roller follower of a variable-speed plate cam mechanism[J]. Frontiers of Mechanical Engineering, 2012, 7(1): 5-15.
Hui Ching FAN, Hong Sen YAN. On the improvement design of dynamic characteristics for the roller follower of a variable-speed plate cam mechanism. Front Mech Eng, 2012, 7(1): 5-15.
Yao Y A, Zhang C, Yan H S. Motion control of cam mechanisms. Mechanism and Machine Theory , 2000, 35(4): 593–607 doi: 10.1016/S0094-114X(99)00025-7
2
Yao Y A, Yan H S, Zhang C. A variable-speed method for reducing residual vibrations in elastic cam-follower systems. ASME Transactions, Journal of Dynamic Systems, Measurement, and Control , 2003, 125(3): 480–482 doi: 10.1115/1.1591811
3
Norton R L. Cam Design and Manufacturing Handbook. New York: Industrial Press, 2002
4
Chew M, Plan M. Application of learning control theory to mechanisms, Part 1: Inverse kinematics and parametric error compensation; Part 2: Reduction of residual vibrations in high-speed electro-mechanical bonding machines. In: Proceedings of the 23rd ASME Mechanisms Conference, Minneapolis , 1994, 25–40
5
Yan H S, Tsai M C, Hsu M H. A variable-speed method for improving motion characteristics of cam-follower systems. ASME Transactions, Journal of Mechanical Design , 1996, 118(2): 250–258 doi: 10.1115/1.2826877
6
Yan H S, Tsai M C, Hsu M H. An experimental study of the effects of cam speeds on cam-follower systems. Mechanism and Machine Theory , 1996, 31(4): 397–412 doi: 10.1016/0094-114X(95)00087-F
7
Yan H S, Tsai W J. A variable-speed approach for preventing cam-follower separation. Journal of Advanced Mechanical Design, Systems and Manufacturing , 2008, 2(1): 12–23 doi: 10.1299/jamdsm.2.12
8
Zeid I. CAD/CAM Theory and Practice, New York: McGraw-Hill, Inc., 1991
9
Chew M, Freudenstein F, Longman R W. Application of optimal control theory to the synthesis of high-speed cam-follower system. Part 1: Optimal criterion; Part 2: System optimzation. ASME Journal of Mechanisms, Transmission, and Automation in Design , 1983, 105: 577–591
