气体渗氮炉温控系统的仿真技术研究

【作者】 王磊；

【导师】 洪志全； 周家纪；

【作者基本信息】 成都理工大学 ， 地球探测与信息技术， 2004， 硕士

【摘要】 这篇论文以作者本人在原工作单位的技术改造实践中(即渗氮炉的技术改造)所遗留下来的技术问题为背景，根据气体渗氮工艺的具体需要，首先提出了用UML对渗氮炉温控系统进行总体的需求分析和系统实物建模以明确温控系统的功能需求及各对象间的交互，在此基础上分析得出温控系统实现的关键所在即PID控制器的分析设计和实现，由气体渗氮炉存在较大的温度滞后这一特性，初步提出用带纯滞后补偿的PID控制器来实现温控系统的温度控制，随后借助于MATLAB6.5平台对带纯滞后补偿的PID控制器和常规的PID控制器进行参数的设计与整定，进而在MATLAB6.5的Simulink仿真环境中对基于两种不同PID控制器的渗氮炉的两种温控系统的设计方案进行了仿真实现及仿真结果比较，结果表明，采用带纯滞后补偿的PID控制系统的鲁棒性较常规的PID控制系统好。为了进一步降低渗氮炉到温前的温度超调量及过渡时间，又提出用一个模式控制器来进行多种升温方式的选择并在Simulink环境中对带有模式控制器的温控系统进行了仿真实现，仿真结果表明带模式控制器的渗氮炉温控系统的控温效果又要优于带纯滞后补偿的PID控制系统。这一仿真研究结果对于传统的位式控温的工业电阻炉的温控系统的技术改造有一定的借鉴、参考作用。最后作为一种尝试，针对小型企业的实际情况用Delphi6.0开发工具构建一个小型渗氮工艺数据库系统以方便从事渗氮工艺的技术人员参考和使用。更多还原

【Abstract】 This paper is based on the problem of technique improvement of gas-nitriding furnace. According to the demand of the technology of gas nitriding, the author firstly put forward total demand analysis and systematic model-making for gas-nitriding furnace’s temperature control system with UML in order to definite the temperature control system’s functional requirement and the interaction of each object in this system on the basis of this idea. It’s thought that the key step for realizing the temperature control system is the analysis and the design of the PID controller. Considering that the gas-nitriding furnace has significant temperature lag, the author initially pointed out the opinion of realizing the system of temperature control by PID controller with pure lag compensation and then designed the parameter of PID controller with pure lag compensation and ordinary PID controller by MATLAB6.5. Furthermore , the two temperature control system formed by two different PID controller are simulated and compared based on the MATLAB6.5’s Simulink circumstances. The result suggests that the robust of the PID control system with pure lag compensation is better than that of the ordinary PID control system. In order to decrease the over-adjusting in temperature and transaction time, a multi-model selector was provided to different scenarios of ascending temperature to make this system be simulated under Simulink’s circumstances. The result of simulation demonstrated that the effect of the system temperature control with model selector is superior to that of the system with PID controller or with pure lag compensation. The research works in this simulation holds an active reference and can be used to improve the technology in the temperature control system of the traditional industrial electric-furnace in which The only method of temperature control is on and off. Finally, as an attempt, an tiny database on nitrogen technology is developed for small industry as the technician’s reference.更多还原