【作者】 赵斌；

【导师】 章新喜；

【作者基本信息】 中国矿业大学 ， 化工过程机械， 2019， 硕士

【摘要】 摩擦电选技术可以在不需要水作为介质的情况下对微细物料进行高效分选。因此,该技术的发展和应用前景十分广阔。然而,目前摩擦电选机的自动化水平还比较低,各设备的启停控制以及参数设置大多还需要在现场手动操作完成。为提高摩擦电选系统的工作效率以及安全性和稳定性,本文设计开发了一套基于模糊PID算法,同时以LabVIEW和PLC为核心的控制系统,具体内容如下:通过对电选系统的结构和工作原理进行分析后,发现风量作为贯穿整个分选过程的参数直接影响到系统的分选效果,因此保证其稳定性及调控性至关重要。PID控制不仅结构简单,而且鲁棒性强,是目前过程控制领域中应用最为广泛的控制方式之一。但是,在复杂的工业过程控制中,单独的PID控制同样存在其局限性。本文在结合电选系统的实际运行特点后,决定采用模糊算法对PID控制器的三个参数进行在线整定以实现对风量的快速精确调控。在Simulink仿真平台中分别建立了模糊PID、传统PID的仿真模型,并对二者在阶跃信号下的仿真结果进行了对比。结果表明,模糊PID控制器有着更好的控制效果。在LabVIEW编程环境下对摩擦电选控制系统进行了上位机软件的开发。对控制系统各部分功能需求进行研究分析后,将软件划分为登录模块、通信模块、联合仿真模块、设备监控模块和数据库模块五部分,并对编译各模块所需调用的功能函数进行自定义封装以实现软件的模块化开发。在STEP-7 MicroWIN环境下对PLC部分进行程序设计,包括各设备的顺序启停控制以及系统运行中各参数的监测和数据传递等内容。结合各软硬件的特点和兼容情况,选择合适的通信方式进行通信:PLC与上位机软件的通信方式选择OPC通信,上位机软件与数采模块的通信选择DCON协议的RS485通信,PLC与变频器之间采用Modbus协议的串口通信。在LabVIEW和Matlab的联合作用下,风量调节响应快、控制精度高。上位机软件的人机界面布局合理,逻辑清晰,便于用户操作。整个摩擦电选机控制系统功能完善、运行稳定、控制效果良好。更多还原

【Abstract】 The development and application of triboelectrostatic beneficiation technology is promising because it can efficiently separate fine materials without the need for water as a medium.However,the triboelectrostatic beneficiation equipment is still at a low level of automation,for example,the start-stop control and parameter setting of each device mostly need to be manually performed on site.In order to improve the efficiency,enhance the safety and stability of the triboelectrostatic beneficiation system,a set of control system based on fuzzy PID algorithm,LabVIEW and PLC is designed and developed in this paper.The details are as follows:After analyzing the structure and working principle of the electrostatic beneficiation system,it is found that the air volume,as the parameter running through the whole process,directly affects the separation effect,so it is essential to ensure its stability and adjustability.PID control is not only simple in structure,but also robust,which is one of the most widely used control methods in the field of process control.However,single PID control also has its limitations in some complex industrial processes.After considering the actual operation characteristics of the electrostatic beneficiation system,the fuzzy algorithm is adopted to adjust the three parameters of the PID controller on-line in order to realize the rapid and accurate control of the air volume.The simulation models of fuzzy PID and traditional PID are established respectively in Simulink platform,and simulation results of the two models are compared under the input step signal.The results show that the fuzzy PID controller has better control effect.The upper monitor software is developed for the triboelectrostatic beneficiation control system in LabVIEW programming environment.After researching and analyzing the functional requirements of each part of the control system,the software is divided into five parts: login module,communication module,co-simulation module,device monitoring module and database module.Meanwhile,the functional functions required for compiling each module are self-defined and encapsulated to realize the modular development of the software.In STEP-7 MicroWIN environment,the PLC part is programmed,including the sequential start-stop control of each device,as well as the monitoring of various parameters and data transmission in the system operation.According to the characteristics and compatibility of each software and hardware,the appropriate mode is chosen for communication: OPC communicationbetween PLC and upper monitor software,RS485 communication under DCON protocol between upper monitor software and data acquisition module,serial communication under Modbus protocol between PLC and frequency converter.Air volume regulation has a quick response and high control accuracy under the co-simulation of LabVIEW and Matlab.The man-machine interface of the upper monitor software has a reasonable layout and clear logic,which is convenient for users to operate.The whole triboelectrostatic beneficiation control system has perfect functions,high stability and good control effect.更多还原