【作者】 张志伟；

【导师】 王雷震；

【作者基本信息】 东北大学 ， 控制理论与控制工程， 2010， 硕士

【摘要】 现场总线是一种目前在自动化领域应用非常广泛的网络技术,具有开放性、分散性、现场环境高度适应性等优点。NetLinx网络架构作为新兴技术,实现了网络之间信息路由无缝连接,已经广泛应用于工业控制领域。论文针对自动化及相关专业的实践教学需求特点,模拟工业生产过程现场实际应用的控制系统的结构形式,搭建了基于EtherNet/IP(以太网)和DeviceNet(设备网)现场总线的过程控制实验平台。过程控制实验平台采用CompactLogix系统,以实验用水箱和电阻炉为控制对象,完成了整体布局设计、硬件接线、下位机程序编写、监控系统的设计、NetLinx工业通讯网络的规划和实验调试等工作。针对网络过程控制实验装置的特点,论文以过程控制实验平台中双容水箱为主要研究对象,设计了串级控制系统。通过RSLinx和RSNetWorx建立控制系统设备间的通讯,实现了现场情况的实时监控、报警。过程控制实验平台采用增量式PID控制算法控制水箱液位。针对增量式PID控制算法超调大、调节时间长等缺点,本文采用模糊PID控制算法及基于遗传算法的模糊PID控制算法,并通过MATLAB进行仿真,结果表明基于遗传算法的模糊PID控制算法能很好地能改善控制系统的稳定性,弥补模糊PID控制算法和增量式PID控制算法的不足。更多还原

【Abstract】 Fieldbus is one kind of the very broad network technology applying to automation field at present, with benefits of open, decentralized, on-site environmental a high degree of adaptability. As a new technology, NetLinx network architecture implements the network routing seamless connection among the information and has been widely used in industrial control.For the characteristics of automation and related professional practice teaching requirements, this paper simulates the current popular industrial process field application of the control system structure and has developed fieldbus process control experimental platform based on the EtherNet/IP and DeviceNet by two-tier network topology. With the completion of the overall layout design, wiring of hardware, PC programming, monitoring system design, NetLinx industrial communication network planning, experimental debugging and so on, process control experimental platform uses CompactLogix series control system to set up the control platform with the control object of experimental resistance furnace and experimental two-tank. Aiming at the features of process control device based on network, this paper takes liquid level control in the process control experiment platform as the main object of research to design cascade control system. Through RSLinx and RSNetWorx, experimental platform establishes the communication among control system devices and realize the real-time monitoring and alarm.Process control experimental platform uses incremental PID control algorithm to control the liquid level of the two-tank system. Aiming at the incremental PID control algorithm’s disadvantages of large overshoot, long settling time, this paper supposes fuzzy PID control algorithm and fuzzy PID control algorithm based on genetic algorithm and simulates by MATLAB. The results showed that the genetic algorithm based on fuzzy PID control algorithm can improve control system performance and make up for the weak point of fuzzy PID control algorithm and incremental PID control algorithm.更多还原