基于PLC的大型基础环境模拟试验室温度控制系统的设计

发布时间：2018-03-11 16:17

本文选题：基础环境模拟试验　切入点：温度控制　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国大型飞行器的设计和制造能力近年来得到了快速发展。为保证装备设计的可靠性以及对各类气候环境的适应性,在投入批量生产之前,必须对其进行环境适应性试验。为节省人力、物力以及财力,有必要建设一个大规模的环境模拟试验室,在试验室中模拟再现飞行器可能遇到的气候状况。本文以某大型基础环境模拟试验室工程项目为背景,基于PLC并且结合WinCC设计了基础环境模拟试验室控制系统,并以大环境室内温度控制部分为对象进行了研究。本文大型基础环境模拟试验系统由大环境室、小环境室以及冷却水、载冷载热、循环风等子系统组成,通过协调控制各个子系统的运行来实现高温、低温、降雨、结冰、降雪等各类气候状况的模拟。首先,根据控制系统总体结构分析了系统总体工艺流程,结合控制系统的技术指标和功能需求,设计了基础环境模拟控制系统的总体方案;其次,以西门子S7-300系列PLC为各个子系统以及集中控制系统的主控制器,完成了温度控制各个子系统的软硬件设计;然后,采用机理法,分别建立了循环风系统中表冷器、阀门处混流部分以及大环境室温度对象的数学模型,在MATLAB/Simulink中对单回路控制、串级控制以及串级模糊PID控制进行了仿真研究,并且采用了模糊PID串级控制对典型顺序试验温度流程进行了仿真验证,在Step7中实现了串级模糊PID控制算法。最后,采用WinCC设计实现了运行监控系统软件,用于控制系统的在线监控。
[Abstract]:China's large aircraft design and manufacturing capabilities has been developing rapidly in recent years. In order to ensure the reliability of equipment design and the adaptability to the climate environment, before put into mass production, must be carried out environmental test on it. In order to save manpower, material resources and financial resources, it is necessary to build a large-scale environmental simulation test room in the laboratory to simulate aircraft may encounter climatic conditions. This paper takes a large project based environmental simulation laboratory as the background, based on PLC and combined with WinCC is designed based on environmental simulation laboratory control system, and the environment of the indoor temperature control part is studied as the object. By environment simulation test chamber this system for large infrastructure environment, small environment chamber and cooling water, the cooling load of heat, composed of circulating air system. Through the coordinated control of each subsystem operation High temperature, low temperature, rain, ice, snow and other climate simulation. Firstly, the overall structure of the control system according to the analysis of the overall process of the system, combined with the technical indicators and functional requirements of the control system, the design of the basic environment simulation of the overall scheme of the control system; secondly, based on the SIEMENS S7-300 series PLC for each subsystem and the main controller of centralized control system, designs the hardware and software of the temperature control of each subsystem; then, using the mechanism method, were established for cooler air circulating system, the mathematical model of the valve flow part and room temperature environment object, control of single loop in MATLAB/Simulink, cascade control and cascade fuzzy PID control is simulated, and the fuzzy PID cascade control is verified by simulation of typical sequential test temperature process, implemented in Step7 cascade mode The PID control algorithm is used. Finally, the software of the running monitoring system is implemented by WinCC design, which is used for the on-line monitoring of the control system.

【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273

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