Jixie chuandong (Jan 2016)
Study on the Parametric of Polynomial Motion Law of the Symmetrical Cam Follower Lifting Profile
Abstract
Aiming at the problem of the largest quasi- velocity and quasi- acceleration of the polynomial motion law of only considering the boundary conditions,the lift profile of the cam follower is divided into two single convex spline curve,the sensitive parameters that affects the acceleration curve and the control point that can control the acceleration curve in the spline boundary point are found by studying the quasi- displacement curve,the one mapping quasi- velocity graph and the quadratic mapping quasi- acceleration graph. The method of symbolic- graphic combination are used to establish the parametric model of polynomial motion law of the lift profile of the symmetrical cam follower and the optimal standard displacement equation are obtained in different conditions by this model. Taking the optimal standard displacement equation as the motion law of the cam follower lift curve,the designers can obtain the cam curve meeting the requirement of minimum lift acceleration of follower in the condition of just knowing the pushing angle and lift range.
