Vol.28 No.11 王丽君等：板宽板厚多变量系统的自抗扰解耦控制 。1073。 Active disturbance rejection decoupling control for strip width and gauge multi- systems WANG Lijun,TONG Chaonan,SUN Yikang Irfomation Engineering School,University of Science and Technology Beijing,Beijng 100083.China ABSTRACT A new control solution to finishing automatic width control (FAWC)and automatic gauge contol(AGC)is proposed based on active distubance rejection controller (ADRC)because the plant is of serious decoupling,large time-delay,uncertainty,many disturbances and nonlinear etc.A new kind of static and dy namic decoupling way based on extended state observer (ESO)is presented to eliminate the coupling between FA WC and AGC.In order to produce the fast transient response of the time-delay sys- tem,the proposed ADRC consists of the ESO and nonlinear state error feedback(NLSEF)without tracking differentiator (TD).The performance of N LSEF is improved by using a nonlinear function and the order of ADRC is lower than the routine ADRC.Simulation results show that the designed controller not only has good decoupling perfo rmance,but also ensures good robustness and adaptability under modeling uncertainty and external disturbance. KEY WORDS strip width;strip thickness active disturbance rejection control(ADRC);extended state observer (ESO);decoupling Morphology and microstructure characterization of 95W-3.5Ni-1.5Fe pow der prepared by mechanical alloying Islam S.Humail,OU Xuanhui,JIA Chengchang,OIN Mingli,HE Xinbo State Key Labomatory for Advanced M etals and M aterials,Materals Science and Engineering School,University of Science an Techmology Bei- jing.Beijing 100083.China ABSTRACT The mechanism of mechanical solid-st ate reactions for formation of tungsten heavy alloy pow- der was discussed.A high-energy ball mill operating at room temperature was used for preparing tungsten heavy alloy pow ders,starting from elemental tungsten(W),nickel (Ni),and iron(Fe)pow ders.X-ray diffraction(XRD),particle size analyzer,scanning electron microscopy (SEM),and transmission electron microscopy (TEM)were used to follow the progress of the mechanical solid-state reaction of W,Ni,and Fe pow ders.These morphological studies revealed three stages in the milling process.In the first stage,the particle defo mation changes the irregular structure of the as-received powder particles to flattened morphol- ogy,and the average particle size increases.In the second stage,the powder is sufficiently deformed and the tendency to fracture predominates over welding,and the particle size decreases.With continuous milling,the system reaches steady state,and relatively small and uniform particle size distribut ion is ob- tained after 20h of milling. KEY WORDS tungsten heavy alloys;mechanical alloying;particle size;morphology Joumal of University of Science and Technology Beijing,2006,13(5):442] (C)1994-2020 China Academic Journal Electronic Publishing House.All rights reserved.http://www.cnki.netActive disturbance rejection decoupling control for strip width and gauge multi￾systems WANG Lijun , TONG Chaonan, SUN Y ikang Inf ormation Engineering School, Universit y of Science and Technology Beijing, Beijing 100083, China ABSTRACT A new control solution to finishing automatic width control ( FAWC) and automatic gauge control ( AGC) is proposed based on active disturbance rejection controller ( ADRC) because the plant is of serious decoupling, large time-delay, uncertainty, many disturbances and nonlinear etc .A new kind of static and dy namic decoupling w ay based on ex tended state observer ( ESO) is presented to eliminate the coupling between FAWC and AGC.In order to produce the fast transient response of the time-delay sy s￾tem, the proposed ADRC consists of the ESO and nonlinear state error feedback ( N LSEF) without tracking differentiator ( TD) .The performance of N LSEF is improved by using a nonlinear function and the order of ADRC is lower than the routine ADRC .Simulation results show that the designed controller no t only has g ood decoupling perfo rmance, but also ensures good robustness and adaptability under modeling uncertainty and external disturbance. KEY WORDS strip width ;strip thickness;active disturbance rejection control ( ADRC) ;extended state observer ( ESO) ;decoupling Morphology and microstructure characterization of 95W-3.5Ni-1.5Fe pow der prepared by mechanical alloying Islam S .Humail, QU X uanhui, J IA Chengchang, QIN Mingli, HE Xinbo S tate Key Laboratory f or Advanced M etals and M aterials, Materials Science and Engineering School, University of Science and Technology Bei￾jing, Beijing 100083, China ABSTRACT The mechanism of mechanical solid-state reactions fo r fo rmation of tung sten heavy alloy pow￾der w as discussed .A high-energy ball mill operating at room temperature was used for preparing tungsten heavy alloy pow ders, starting from elemental tungsten ( W) , nickel ( Ni) , and iron ( Fe) pow ders.X-ray diffraction ( XRD) , particle size analyzer, scanning electron microscopy ( SEM ) , and transmission electron microscopy ( TEM ) w ere used to follow the prog ress of the mechanical solid-state reaction of W, Ni, and Fe pow ders .These morphological studies revealed three stages in the milling process .In the first stage, the particle defo rmation changes the irregular structure of the as-received powder particles to flattened morphol￾ogy, and the average particle size increases.In the second stage, the powder is sufficiently deformed and the tendency to fracture predominates over welding, and the particle size decreases.With co ntinuous milling, the sy stem reaches steady state, and relatively small and uniform particle size distribution is ob￾tained after 20 h of milling . KEY WORDS tung sten heavy alloys ;mechanical alloying ;particle size;morphology [ 摘自 Journal of University of Science and Technology Beijing, 2006, 13( 5) :442] Vol.28 No.11 王丽君等:板宽板厚多变量系统的自抗扰解耦控制 · 1073 ·