Experimental Investigation And Finite Element Analysis Of The Rope-sheave Interaction At Traction Interface

Traction drive system is the most important mechanism in power transmission of elevator,which has been developed for a long time.Nowadays,the performance requirements of elevator including the stability and reliability are stricter than before.This thesis mainly studies the traction behavior at the interface between traction sheave and the wire ropes,which are vitally significant for traction drive system.In this thesis,a testing rig with mature control strategies was established to simulate the real working condition of traction drive system.Also,many sensors were assembled in the testing rig to measure many information about traction condition.What's more,FEM and analysis of the rope-sheave interaction at elevator traction interface was done.With the measuring and numerical analysis results,the thesis discussed the dynamic traction and slip mechanism of traction drive system.This article's frame is as follows.First,the article demonstrated the construction procedure of the testing rig,which mainly consisted of two real tractor.One was used as a power supplier and offered an interaction surface for the traction.The other was used as a loader,which simulated the real torque of the drive system.By adjusting the torque load,the force finally transferred to ropes-end of wire ropes.Then,a control system was established to make sure that the motors can operate in all required conditions.Apart from control system,the testing rig also need measuring system to complete data acquisition.Next,experimental schemes were designed to study the traction mechanism in many different working conditions.By analyzing the measured data including the tension of wire ropes,rotating speeds,torque of the main shaft and the slippage of the traction interface,author conclude that the pretention force of wire ropes will affect the slip speed of interface between ropes and groove and the slip speeds of different region of contact area are not consistent.At last,due to the geometrical complexity of the contact between traction sheave and the wire ropes,the traction behavior at the interface is hard to observe and analyze in practice,thus it is not well understood and need further study.In this article,a 3D FE contact model of a bended 6+1 wire rope strand over a simplified traction sheave are developed to investigate the traction behavior and mechanism.