【作者】 李向阳；

【导师】 周恩涛；

【作者基本信息】 东北大学 ， 机械设计及理论， 2009， 硕士

【摘要】 随着我国工业化和现代化建设的不断深入,我国已经成为了世界上最大的钢铁生产和消费大国,企业对钢材的需求量增加的同时对钢材质量也提出了更高的要求。本课题是以某钢铁公司的科技攻关项目“连铸扇形段辊缝调节”中的四缸同步液压控制系统为研究对象,采用伺服阀提高系统的位置控制精度和系统的响应能力。论文开始对连铸技术国内外发展状况进行了概述,然后通过对连铸扇形段结构的分析以及多缸同步实现方法的了解,确定本课题采用阀控非对称缸伺服系统。在一定的假设条件下建立了阀控非对称缸的数学模型,并对相关的参数进行了详细的推导和求解。在建好数学模型的基础上,利用MATLAB/Simulink仿真软件对未加控制器的四缸运动进行了仿真,通过仔细分析,明确了采用控制策略的必要性。随后对PID控制和模糊控制进行了阐述,并对在PID控制策略作用下的四缸运动进行了仿真,通过对仿真结果的分析,找出了常规PID控制器在本课题中的局限性,最后采用了模糊控制和PID控制相结合的控制策略对四缸同步系统进行控制。仿真结果表明,在模糊PID控制作用下连铸扇形段四缸运动在误差允许范围内实现了同步,同步误差小于1%。同时,当系统受到较大的外力冲击时,四缸也能够迅速的同步提升,保护了液压系统免受损坏,达到了设计要求。更多还原

【Abstract】 With the development of industrialization and modernization,China has become the largest steel producer and consumer in the world. The Enterprises’s Steel demand is more larger and quality demand is higher at the same time. This task researched hydraulic synchronization control of four-cylinder systems based on the sector section roll gap of continuous casting which is the key problems in science and technology of one steel compony.Servo system used to improve the position control system accuracy and responsiveness.At the begining of text,it makes a summarize about the development of continuous casting technology. And then by the analysis of fan-shaped structure above, the valve-controlled nonsymmetrical hydraulic cylinder system is adopted. After some assumptions, the valve-controlled nonsymmetrical hydraulic cylinder math model is built and solving parameters of the system. Based on math model, simulation of four-cylinder synchronization without controller is made by MATLAB/Simulink module tool. Then make a expatiation about PID controller and fuzzy controller. Simulation of four-cylinder,s movement which under PID control strategy is made.To overcome the limitation of PID control appeared in the analysis result,a new kind of strategy is designed to control the hydraulic system using fuzzy-PID complex controller method.Simulation results show that Four-cylinder’s movement have reached synchronization while synchronization error in the range of allowable values which is 1%.At the same time, when the system by the larger external shocks, four-cylinder can be quickly synchronized to upgrade and protect the hydraulic system from damage,so it reachs the design requirements.更多还原