电气外文翻译-基于智能PID调节的连续烧结炉温度控.doc

毕业设计/论文外 文 文 献 翻 译系 别 机电与自动化学院 专 业 班 级 电气0703 姓 名 评 分 指 导 教 师 2011 年 1 月 20日 9毕业设计/论文外文文献翻译要求：1外文文献翻译的内容应与毕业设计/论文课题相关。2外文文献翻译的字数：非英语专业学生应完成与毕业设计/论文课题内容相关的不少于2000汉字的外文文献翻译任务（其中，汉语言文学专业、艺术类专业不作要求），英语专业学生应完成不少于2000汉字的二外文献翻译任务。格式按华中科技大学武昌分校本科毕业设计/论文撰写规范的要求撰写。3外文文献翻译附于开题报告之后：第一部分为译文，第二部分为外文文献原文，译文与原文均需单独编制页码（底端居中）并注明出处。本附件为封面，封面上不得出现页码。4外文文献翻译原文由指导教师指定，同一指导教师指导的学生不得选用相同的外文原文。 2008年国际计算机、电子工程会议基于智能PID调节的连续烧结炉温度控制系统曹树坤,张亚兰,张亨 （济南大学机械工程学院中国济南）摘要：为满足在多个炉床的连续烧结炉精确温度控制精度的要求，该系统是由电脑XMT624和对温度场控制的固态继电器组成。根据烧结炉加热过程中的温度惯性、时滞的特点,采用智能PID算法来实现大范围温度调节,克服了传统PID控制的局限。通过在线实时设置智能指令单元, 该系统可以达到2的温度控制精度目标。关键词：1 引言连续烧结炉是一种常用的为金属粉末注射塑料件加热设备,它包含了脱脂和调试的过程。在粗糙的部分通过脱脂炉后,然后通过一个封闭的输送带进入水平连续烧结炉。脱脂炉和烧结炉由两台炉子门分隔。其主要部分被分为加热、烧结、冷却三部分。连续烧结炉的烧结质量取决于温度的均匀性和烧结过程的稳定性, THEN = (k);规则1能确保：测量值小于温度设定值时，迅速下降。规则2：IF THEN =;为减少频繁的运动和不影响温度控制的精确性，规则2为温度偏差设置了一个死区。规则3：IF THEN = (k);The rule 1 can guarantee that a measured value is less than the temperature setting value, rapidly fall.Rule 2: IF THEN =;To eliminate the frequent motion and not affect precision temperature control, the rule 2 set a dead zone for temperature deviations. Rule 3:IF THEN=+ -+;Rule 3 does not use differential controls, and according the scene control situation to adjust and.4. Setting of PID on-line parametersThe communications interface of XMT624 instrument is optoelectronic output isolation principal and subordinate asynchronous RS485, and general PC only has RS232 interface, RS232 and RS485 interface electrical characteristics are incompatible with each other, so using RS232 /RS485 converter ZW485C, to change RS232 signal into RS485 signal. The system works in half-duplex mode, the PC based on the current state sends orders in order to read the signal that XMT624 instrument detected, and sends an order to XMT624 for setting parameters. XMT624 receives the order immediately after the response, and on the instrument panel vision the current operating state. The communication of temperature control instrument and PC is: communication speed of 9600bps; stopping bits: 1; data bits: 8; parity bits: none. XMT624 defines input, output and state parameters, and assigns the address. The main parameters as listed in Table 1: With the development of intelligent control theory, PID control technology is more and more mature. The intelligent PID algorithm is nonlinear, which can be used to conquer the limitation of the traditional PID. The rule 1 and rule 2 can make the system fast.Three basic parameters of the PID controller can be directly read and wrote in the corresponding address through the PC interface, so it is controlled expediently. When read and write parameters, firstly, we should know the parameters code. The reading parameters code is 03 and the writing parameters code is 10H. For example, reading measurements PV, the data format sent by the main frame is shown as Table 2: The first address in the data format is the XMT624s address. The second address is the PVs EMS memory address. If it reads the ratio factor P, it changes the second address to EMS memory address1004H is OK. The reading and writing parameters data format is similar. And it needs to change the functional code to the writing parameters functional code 10H.Three basic parameters of PID are interaction and mutual constraints and are restricted by the physical environmental factors. So it should decide the eclectic choice between the material circs and control requires. Some instance in actual use can be adjusted as follows:(1) The temperature reaches target very quickly, but the temperature overshoot is great: consider reducing proportions coefficients or increasing differential coefficient time.(2) The temperature often fails to the target and the time is great: consider increasing the proportions coefficients or integral time.(3) It can fluctuate at the basic control goals, but deviation is oversize, and it is often volatile: consider increasing differential coefficient or reducing integral time, and the work cycle may be set shorter.(4) It is affected greatly by the surrounding environment or the weather changes. Little change will cause some changes in the temperature fluctuations: consider increase differential coefficient or shorten the cycle time.5. ConclusionsWith the development of intelligent control theory, PID control technology is more and more mature. The intelligent PID algorithm is nonlinear, which can be used to conquer the limitation of the traditional PID. The rule 1 and rule 2 can make the system fast and stability, and the rule 3 makes the PID adaptive capability with the variable parameters. It realizes the parameters of PID setting on-line through programming, and increases system control accuracy. With intelligent PID control, the result of PID control can be directly affected by the set of P, I, D etc, and such several parameters have close relation with the control system itself. So it is difficult to give a fixed value which adapts to any system. Therefore, the use of the intelligent PID algorithm, according to the actual situation, must debug at the scene and find a group of control parameters suitable to the system itself.6. AcknowledgementThis paper is supported by Young Scientist Encouragement Foundation of Shandong Province(Project No.2005BS05007), Shandong Provincial Natural Science Foundation (Project No.Y2006F01),and Key Subject(Laboratory) Research Foundation of Shandong Province.7. References1 Mercedes Ramirez, Rodolfo Haber, Victor Penab, and Ivan Rodriguez, “Fuzzy control of a multiple hearth furnace”, Computers in Industry, 2003, No. 54, pp. 105-113.2 Perttu Laurinen, Juha Roning, “An adaptive neural network model for predicting the post roughing mill temperature of steel slabs in the reheating furnace”, Journal of Materials Processing Technology, 2005, No. 168, pp.423430.3 Elena Grassi, Kostas Tsakalis, “PID controller tuning by frequency loop-shapi