Vibration Reduction For Multi-modal Follower System Of High-speed Cam

Cam mechanisms are widely utilized in the field of automatic machines.The demand for high-speed cam with excellent performance has increased quickly.However,under the high-speed operation,the vibration response of cam follower systems have become stronger,which will seriously affect the performance and useful life of mechanical systems.Therefor,design of a high performance cam profile will has important practical applications.The purpose of this paper is to design a high-speed cam profiles that can inhibit vibrations of multi-modal cam follower system.Take the two degrees of freedom of cam follower system for the study,and carry out a detailed dynamic analysis.Using analytical method to analysis the ratio of system vibration response about higher modes and lower modes.Under the analysis,at the end of system,the more flexibility of system,the ratio of vibration contribution will be more greater,even more than 1.It shows that the contribution of higher modes in some cases can not be ignored,which provides a theoretical basis for using the higher modes to design controllers.The use of command smoothing technique and input shaping technique,which are all designed based on the frequencies and damp ratio of the system,designed two kind of high-speed cam profiles.Then analysis the motion characteristics of the two cam profiles in detail.It's dynamic response of the follower system indicates that they can effectively suppress the vibration of the cam follower system.No matter the variations of the system parameters or the cam drive speed changes,the vibration of the system can be suppressed to a very low range,indicating its robustness is very good.