Study On Vertical Force Loading In Automobile Low-speed Tire Testing Machine

The automobile low-speed tire test machine is physical half-objective simulative system.Its function is to simulate,under laboratory conditions,automobile running on the road surface so as to detect technical performance index of the automobile tire.With the rapid development of our country' automobile industry,the sharp increase of the number of automobiles and traffic accident are accompanied.After synthesizing numerous related literatures and reference materials home and abroad,the automobile low-speed tire test machine of domestic and oversea system is summarized,and the merit and shortcoming is analyzed.The studying direction is decided through comparing domestic products and overseas products.The research direction of this paper is the vertical force loading in automobile low-speed tire test machine.In this dissertation,the author builds up mathematical model of the vertical force loading in automobile low-speed tire test machine and simplified treatment.By thoroughly analyzing its control performance and researching the relationship between mechanism and characteristics,the basic theories are provided to improve control performance of vertical force loading in automobile low-speed tire test machine and also simulate the linear model and the non-linear model of unsymmetrical cylinder by using modules in SIMULINK software package.This paper put forward a new double-valves controlling scheme,use a pressure servo valve and a flow servo valve to control loading system.The experimental system is build up in this dissertation,by which we proposed the experimental research aiming at two schemes which are loads controlled system by single pressure servo valve and flow servo valve.When pressure is controlled,how to improve the static and dynamic performances of the control loading system is taken to be key point,using three pressure stages to respectively meet absolute accuracy of high-pressure and low-pressure.It receives static and dynamic performances by testing,which can prove that the methods advanced in this conclusion is effective for improving the comprehensive control performances of the vertical force loading in automobile low-speed tire test machine.From the methods improving the control performance of vertical force loading control system in automobile low-speed tire test machine,we can draw the conclusions that the methods are fit for the rest passive loading system.