【作者】 王军；

【导师】 钱晓龙；

【作者基本信息】 东北大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 拉拔是确保钢丝成品质量的最后一道关键工序。张力控制系统是拉丝机的主要控制系统,在保证钢丝质量满足用户需求方面,起着至关重要的作用,在提高成品钢丝的精度方面,具有重要的现实意义。由于拉丝机的张力控制系统模型具有非线性、前后张力不同等特点,给系统的控制带来了不确定性,对PID的控制性能影响较大,本文将一种新型的控制算法：模糊控制算法应用到张力控制中,‘并将之与传统的PID控制相结合。文中首先论述钢丝连续拉丝机的工作原理,重点介绍拉丝机的拉拔工艺,并分析不同类型拉丝机的特性,总结出连续拉丝机控制所需解决的问题主要是张力控制策略的改进。在建立张力控制系统中张力测量机构、直进式拉丝机的数学模型的过程中,针对其控制系统的特点,指出选择模糊控制算法的原因。通过研究经典PID控制算法和模糊控制算法,为张力控制系统的实现奠定理论基础。由于影响系统张力的因素较多,使用单控制通道很难达到高精度张力控制,因此在控制器的设计上,本文选取了基于双控制器的模糊PID控制器,给出拉丝机张力控制系统的结构,将模糊PID控制算法应用到钢丝拉丝机控制中,对拉丝机张力PID控制系统、模糊PID控制系统进行仿真,并比较了传统PID和模糊PID方法的优缺点,仿真结果表明模糊控制PID算法对张力的控制效果要明显地好于传统PID控制方法,验证了模糊PID算法的可行性、有效性和稳健性,说明其完全可以成功地应用到钢丝拉丝机张力控制系统当中。同时,本文也对模糊PID控制算法进行了实现,建立基于西门子PLC的钢丝拉丝机控制系统,并给出控制流程和软件设计,以此说明这种控制策略具有很强的适应性,具有实际的应用价值。更多还原

【Abstract】 Drawing is a key processes to ensure the quality of the final steel wire products. Tension Drawing Machine Control System is the main control system, guarantee the quality steel wire to meet user demand, which plays a vital role in raising the precision of finished steel, have important practical significance.Subject to the background of nonlinear tension control model of Drawing Machine, and the difference between front and back tensions, the uncertainty brings bad effect on the performance PID control. A new type of control algorithm was proposed:fuzzy control algorithm, and combined it with the traditional PID control algorithm.This paper describes the working principle of wire drawing machine, focuses on the process of drawing, and analyses the different types of wire drawing machine, sums up that the improvement of control solution is the key problem of improving tension control for wire drawing machine. And then, the mathematical models of tension control measuring machine, straight wire drawing machine are established. According to the characteristics of the control system, the paper has pointed out reasons of fuzzy control algorithm selection. In depth study of the classic PID control and fuzzy control algorithms, laid a theoretical foundation for the accurate realization of tension control system.Since many factors affect the tension system, the use of single-channel control is difficult to achieve high-precision control. This controller has been selected based on double Fuzzy PID controllers. A wire drawing machine tension control system is designed and the structure of the fuzzy PID control for Steel drawing machine is proposed. The simulation of PID and fuzzy PID tension control system is given out, and comparison, simulation results show that performance of the fuzzy tension control is obviously better than traditional PID control method. And the feasibility, effectiveness and robustness prove that Fuzzy PID can successfully complete its application to Steel drawing machine tension control.At the same time, based on the establishment of the steel drawing control system by Siemens PLC, we also implement the fuzzy PID control algorithm. Control process and software design are proposed. It is proved that the control strategy has a strong Adaptability and practical value.更多还原