On the design of rotating speed functions to improve the acceleration peakvalue of ball-screw transmission mechanism

The objective of this paper is to design a polynomial rotating speed functi on for the crank of a ball-screw transmission mechanism with the aim of low ering the peak acceleration value of the screw. For the purpose of analyzin g the kinematic characteristics of the mechanism, the non-dimensional motio n equations of the ball-screw transmission mechanism were derived. From the analysis, a set of design rules was devised and a polynomial rotating spee d function of degree 6 was designed. It was revealed from computer analysis that as the rotating speed function was applied to the crank input, the pe ak acceleration value of the constant pitch screw, operated at a constant s peed, was decreased by 20%. For comparison purpose, a computer-controlled t est rig for characterizing the kinematics of a ball-screw transmission mech anism was also designed and manufactured. The results from the tests and th e analytical model were comparable. (C) 2001 Elsevier Science Ltd. All righ ts reserved.