【作者】 赵斌；

【导师】 权龙；

【作者基本信息】 太原理工大学 ， 机械电子工程， 2007， 硕士

【摘要】 电液伺服系统集电气、液压优点于一身，既有电气系统对误差信号的检测、校正和放大的便利，又有液压动力元件响应速度快，抗负载刚性大，液压元件功率—重量比和力—质量比大的优点，实现了被控量的闭环控制，使之成为控制精度最优的伺服系统，其应用已遍及国民经济和军事工业的各个技术领域，特别是负载质量大又要求响应速度快的场合使用最为合适。电液比例技术填补了传统开关式液压控制技术与伺服控制技术之间的空白，已成为流体传动与控制技术中最富生命力的分支。因此在对响应频率要求不高的一般工业应用中，有可能以其廉价、抗污染和节能等优势来取代伺服阀。把电液比例阀成功地应用到闭环控制的系统中并应用先进的控制策略改善它的性能，这对于改造传统工业中使用的开关控制阀和开环比例控制系统具有重要的意义，同时对于发展和完善电液比例控制技术也具有一定的意义。在钢坯修磨机中，被磨坯料通过液压马达驱动的小车牵引，钢丝绳牵引台车在导轨上运动，负载惯性较大且在传动链中由于有钢丝绳的存在而具有较大的柔性。在实际使用中，小车换向时教大的惯性会产生压力冲击，过高的冲击力常导致牵引钢丝绳的断丝，甚至完全断裂，所以经常需要更换钢丝绳，增加了生产成本而且对修磨机的正常工作有很大的影响。本文设计了钢坯修磨机钢丝绳张力控制系统，并且对电液比例阀控非对称液压缸伺服系统的所有液压元件和修磨机柔性负载系统进行了建模，通过MATLAB／SIMULINK仿真，主要分析了预紧力对钢丝绳受力的影响，而且对开环无反馈、力环反馈、位移反馈的仿真结果进行了比较、得出了可靠的结论。最后使用PID控制器对力反馈张力控制系统进行了校正，改善了系统的性能。更多还原

【Abstract】 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.更多还原