变规则模糊温度控制策略在中频感应焊后热处理中的应用
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摘要
对厚壁焊接压力容器焊后热处理工艺使用的中频电磁感应加热的温度控制算法进行研究,根据模糊控制原理和热处理要求的升温速度可控、保温温度稳定、降温速度可控,提出了变规则模糊温度控制策略并编写了控制程序。为变规则模糊温度控制策略设计了两种判定规则,当温度偏差较大时,采用粗调模糊规则,实现温度以限定值进行升降温;当温度偏差较小时,采用精调模糊规则,得到较高的控制精度,利用此变规则模糊温度控制策略确保厚壁焊接压力容器在升降温时实现温度偏差在±1℃的范围内。最后,利用这种控制策略对特定工件的电磁感应加热过程进行了测试。实验结果表明采用此算法能够满足加热控制的相应要求。
Study on the temperature control algorithms of medium-frequency induction heating applied in post weld heat treatment of thick-wall welded pressure vessels is carried out.According to the principle of fuzzy control and requirements of heat treatment of heating speed,temperature stability,controllable cooling rate,the variable rule fuzzy control strategy is employed and the corresponding control codes are programmed.Two kinds of control rules are designed by using variable rule fuzzy control strategy.In the case of large temperature deviation,the coarse fuzzy rule is established to achieve fast convergence.In the case of small temperature deviation,the fine control rule is presented to obtain higher control accuracy.The variable rule fuzzy control strategy ensures that the temperature deviation of the thick-wall welding pressure vessel is heated at range of±1℃.Finally,the induction heatingof a specific workpiece is performed by using this control strategy.Results show that variable rule fuzzy control strategies are able to meet the corresponding requirements of the temperature control in such a hysteresis nonlinear inertial system.
Study on the temperature control algorithms of medium-frequency induction heating applied in post weld heat treatment of thick-wall welded pressure vessels is carried out.According to the principle of fuzzy control and requirements of heat treatment of heating speed,temperature stability,controllable cooling rate,the variable rule fuzzy control strategy is employed and the corresponding control codes are programmed.Two kinds of control rules are designed by using variable rule fuzzy control strategy.In the case of large temperature deviation,the coarse fuzzy rule is established to achieve fast convergence.In the case of small temperature deviation,the fine control rule is presented to obtain higher control accuracy.The variable rule fuzzy control strategy ensures that the temperature deviation of the thick-wall welding pressure vessel is heated at range of±1℃.Finally,the induction heatingof a specific workpiece is performed by using this control strategy.Results show that variable rule fuzzy control strategies are able to meet the corresponding requirements of the temperature control in such a hysteresis nonlinear inertial system.
引文
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[2]SHULYAK A A,STARTSEV A V,KOROVIN E M,et al.Local heat treatment of large welded pressure vessels by induction heating[J].Welding International,2011,25(8):652-655.
[3]孙克刚,李林,焦占豪.电磁感应加热在管道管口焊接预热中的应用[J].管道技术与设备,2005(4):30-32.SUN Kegang,LI Lin,JIAO Zhanhao.Application of the electromagnetic induction heater to pipe mouth welding preheating in pipeline[J].Pipeline Technique and Equipment,2005(4):30-32.
[4]孙国辉,王晓辉.电磁感应加热在核电蒸汽发生器管板堆焊预热和后热中的应用[J].电焊机,2014,44(3):31-34.SUN Guohui,WANG Xiaohui.Application of electromagnetic induction heating for generator tube sheet cladding of the nuclear power steam[J].Electric Welding Machine,2014,44(3):31-34.
[5]HOU X G,WANG C L.Induction heating furnace temperature control based on the fuzzy PID[J].Applied Mechanics and Materials,2012:2463-2466.
[6]KONGSAKORN P,JANGWANITLERT A.Fuzzy logic control of a two-output high-frequency series-resonant induction heater[C]//International Conference on Electrical Engineering/electronics,Computer,Telecommunications and Information Technology.IEEE,2014(11):1-4.
[7]WANG Y,CAO F.Induction heating power supply temperature control based on a novel fuzzy controller[C]//International Conference on Computer and Electrical Engineering.IEEE Computer Society,2008:615-618.
[8]屠毅,林贵平.大型飞机座舱温度控制系统仿真[J].航空学报,2011,32(1):49-57.TU Yi,LIN Guiping.Simulation of large-scale aircraft cabin temperature control system[J].Acta Aeronautica Et Astronautica Sinica,2011,32(1):49-57.
[9]袁清珂,张明天,冯桑.电阻点焊的变论域模糊控制方法[J].控制理论与应用,2010,27(3):387-390.YUAN Qingke,ZHANG Mingtian,FENG Sang.Variable universe fuzzy control methods for resistance spot welding[J].Control Theory&Applications,2010,27(3):387-390.
[10]王川川,赵锦成,齐晓慧.模糊控制器设计中量化因子、比例因子的选择[J].兵器装备工程学报,2009,30(1):61-63.WANG Chuanchuan,ZHAO Jincheng,QI Xiaohui.The selection of quantitative factor and proportion factor in the design of fuzzy controller[J].Journal of Ordnance Equipment Engineering,2009,30(1):61-63.