Adopt Tension Control Theory To Improve The Motion Rigidity Of Large Inertia Flexibility Servosystem

The electro-hydraulic servo system involve in the merits of both electricity and hydraulic pressure. It not only has the facility of electric system's checking, rectifing and error signal magnifying, but also has the advantages of hydraulic system's high response and load of resistance, high power-weight ratio of hydraulic element, controlled variable closed loop control, etc. Those make it to be the best system in servo control field. It has been applicated to many fields of both national economy and military industry, especially used on the occasions that need large weighted loading and high-response speeds.As one of the most vitality offset of hydro-liquid drive and control field, Electro-hydraulic proportion controls technique fills up a blank between traditional on-off hydraulic pressure control technique and servo-control technique. Because of the superiority of cheapness, stabiles, anti-pollution, low energy-cost, it is probability that Electro-Hydraulic proportion controls technique will replace servo valves in application of the general industry. To apply the electro-hydraulic proportional valve to close-loop controlled system and improve the capability with advanced control strategy is significant for regeneration traditional industry controlled with on-off valve or open-loop proportional valve, it will develop and perfect this technique. In the billet grind machine, the flan which be grinded is drawn by the car driven by hydraulic motor. Steel wire rope draws the car moving on the rail, the load has large inertia and elasticity because of the existence of steel wire rope in the chain of transmission. In the realistic use, the pressure impact will be engendered at the time of changing the direction of the car, the higher impact will bring on the break of the steel wire rope, even complete break, so often need for replace steel wire to increase know clearly manufacturing cost, furthermore have a great influence on normal working of Grinding Machine. This thesis DESign steel wire tension control system of Steel Billet Grinding Machine, and establish mathematical model of every component in electro-hydraulic proportional valve control dissymmetry hydraulic cylinder servosystem and the load with large inertia and flexibility system of Grinding Machine. Through the medium of matlab/simulink simulation, this thesis mostly analyses Pre-load impact of steel wire stress. Compare with the emulation result of non-feedback, force feedback, displacement feedback, thereby educe reliable conclusion. At last, PID controller is used to rectify the force feedback tension controlling system of the Grinding Machine. As a result, the characteristic of the system is improved.