Influence of spring dynamics and friction on a spring-actuated cam system |
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Authors: | K Y Ahn S H Kim |
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Institution: | (1) Department of Mechanical Engineering, KAIST 373-1, Kusong-dong, Yusong-gu, Taejon 305-701, Korea e-mail: kimsh@kaist.ac.kr Fax: +82-42-869-5203, KR |
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Abstract: | Summary The paper investigates two important aspects, friction and spring motion, of the dynamics of a spring-actuated cam system.
The characteristics of the friction on the camshaft are analyzed using the nonlinear pendulum experiment, while the parameters
of the friction model are estimated using the optimization technique. The analysis reveals that the friction of the camshaft
depends on stick–slip, Stribeck effect and viscous damping. Spring elements are found to have much influence on the dynamic
characteristics. Hence, they are modeled as four-degrees-of-freedom lumped masses with equivalent springs. The lumped masses
and equivalent springs are obtained to match the static stiffness and natural frequency of the actual spring. The appropriateness
of the derived friction and spring model are verified by its application to a vacuum circuit-breaker mechanism of the cam-follower
type.
Received 23 March 2000; accepted for publication 21 November 2000 |
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Keywords: | Hybrid Friction Model Parameter Estimation Spring Motion Cam System |
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