DESIGNING DYNAMICALLY COMPENSATED AND ROBUST CAM PROFILES WITH BERNSTEIN-BEZIER-HARMONIC-CURVES

This paper deals with the problem of designing dynamically compensated cam profiles to minimize residual vibrations in high-speed cam-follow er systems. The traditional Polydyne method is modified and extended t o achieve significant improvement in residual vibration characteristic s. First, cam displacement curves are represented by Bernstein-Bezier harmonic curves as opposed to polynomial curves. These recently develo ped harmonic curves are low in harmonic content and therefore the resu lting cant profiles are less prone to induce resonant vibrations in th e follower system. Second, the design procedure is expanded such that the residual vibrations of the resulting cam-follower system is not on ly extinguished at the design speed but also made insensitive to speed variations. Numerical examples are given in the end.