首页 | 本学科首页   官方微博 | 高级检索  
检索     
共有20条相似文献,以下是第1-20项 搜索用时 132 毫秒

1.  程序温控仪中PID参数自整定算法  被引次数:12
   秦文虎  周杏鹏《自动化仪表》,2000年第21卷第1期
   A selftuning algorithm for PID parameters which is suitable forprogrammable temperature controller is statedThe principle of the algorithm and the design of softwareare introducedThealgorithm has been used in practical control system with excellent control results.    

2.  并列锅炉蒸汽母管压力控制方案  
   顾洪《自动化仪表》,2000年第21卷第1期
   The pressure control strategy ofsteam header for two of the 75th tied up boilers is improvedOne measure is by using the sum of the steam flows of twoboilers as external disturbance to avoid interference of false disturbance signalanother one is implementingoutput bumpless switching with the AutoManual Swithchone of the software blocksThe practical operation shows excellent results.    

3.  可编程序控制器在焦化系统中的应用  
   岳素梅  程少刚《自动化仪表》,2000年第21卷第1期
   In order to overcome thedisadvantages of relay-contactor controliemore failureslow reliability and huge maintenancethe applications of programmable controller PLCfor coal-preparation in coking process and coke sievesystem are introducedThe selection of the PLCsdesign criteria and the anti-interference measures ininstallation and test are emphasized    

4.  一种基于Smith预估器的温度控制系统  被引次数:5
   余勇  万德钧《自动化仪表》,2000年第21卷第1期
   To meet the dead timefeature of the temperature control system the design method of the system based on Smithestimator is statedThemethod can overcome the effect of dead time on the stability of the temperature controlsystem and offer better robustnessThe experimental results show that the control accuracy isup to +/-02℃.    

5.  DCS的远程诊断和维护  被引次数:2
   李瑞明《自动化仪表》,2000年第21卷第1期
   Combining with the IA system the effect andimplementing method of remote diagnosis and maintenance of the distributed control system DCSare presented    

6.  Labwindows/CVI在PC与μXL集散系统通信中的应用  被引次数:2
   何晓燕  张雪申  黄丽华《自动化仪表》,2000年第21卷第1期
   Virtual instrumenttechnology is the result of instrumental technology and computer technologyThe composition of virtualinstrument system and the features of LabwindowsCVIthe developing platform of virtual instrument software areintroducedBy usingthe example of communication with μXL distributed control system the application of CVI ispresented    

7.  OCS行车电子秤的设计  
   赵岳清《自动化仪表》,2000年第21卷第1期
   The compositionstructure of the scale bodyweighing instrument andtransducer of the electronic scale for overhead crane are introducedSeveral commonly used structures of theweighing body in electronic scale for overhead crane are emphasizedThe system accuracy offered by different bodystructure is presentedThe common structure and the forced conditions of the main components in suchelectronic scales are analyzed and the criteria should be followed in design are described.    

8.  风险分析的尖点突变模型  
   钱新明  乔士平《北京理工大学学报(英文版)》,1999年第8卷第2期
    Aim To assess simultaneously various risk states of a system. MethodsUsing the catastrophe and fuzzy theory, the energy and uncertainty in a system are set astwo control variables and the function of the system is used as the state variable foranalysis. Results and Conclusion A risk analysis model named the cuspmodel is presented. Various states regarding the safety of the system such as the accidentstate, no-accident state and miss state can be represented at will on the cusp model.    

9.  LonWorks现场总线的本安技术  被引次数:3
   汤同奎  邵惠鹤  段培永《自动化仪表》,2000年第21卷第1期
   The standard ofintrinsic safety and the design of the parameters of intrinsic safety circuit aredescribed firstlyThethe intrinsic safety assembly of IS78 and its specification are introducedThe connection between IS78the physical channel of LonWorksand the network of safety area is discussed finally.    

10.  均衡掺铒光纤放大器及8×2.5Gb/s 450km传输实验  
   崔景翠  刘小明  刘丹《电子学报》,1999年第27卷第11期
    Aiming at the problem ofdynamically gain imbalance in cascaded amplification WDM system,a series of dynamicallygain equalized Erbium-doped fiber power booster and inline amplifier were designed andbuilt,in which the population inversion was controlled.The equalisation transmission wasdemonstrated by using this kind of EDFA.    

11.  在中型加热炉控制上应用数学模型的成功实践  被引次数:1
   梁斌  倪枫《自动化仪表》,2000年第21卷第1期
   On the basis of thedescription of the features and technique of the furnaces the methods of implementing loopcontrol and mathemateical model control are describedAlso the composition of the control loopsthe control algorithms andstrategies related to the mathematical model are presentedThe practice results show that the satisfied controlresults are obtained    

12.  动态系统的自适应模糊神经网络控制  被引次数:1
   赵保军  韩月秋  毛二可《北京理工大学学报(英文版)》,1999年第8卷第2期
    Aim To build an adaptive fuzzy neural controller and simulateit. Methods Fuzzy logic and back propagation(BP) algorithm are combinedto utilize their advantages while avoiding the disadvantages. Results andConclusion Simulation results of the third-order plant with disturbances and deadtimes show the validity of the presented controller. The presented controller can controlcases that preceding controllers were unable to control.    

13.  从INTERKAMA‘99看现场总线  被引次数:5
   孙国林 梁怀喜《自动化仪表》,2000年第21卷第1期
   The exhibits of the mainfield bus products on INTERKAMA99 Exhibition and their applications are introducedbrieflyThedeveloping trend is forecasted    

14.  基于DA算法的二维离散余弦逆变换的ASIC设计  
   陈禾  韩月秋《北京理工大学学报(英文版)》,1999年第8卷第2期
    Aim To present an ASIC design of DA-based 2-D IDCT. MethodsIn the design of 1-D IDCT is utilized a Chen-based fast IDCT algorithm, and multiplieraccumulators based on distributed algorithm contributes in reducing the hardware amountand in enhancing the speed performance. Results and Conclusion VHDLsimulation, synthesis and layout design of system are implemented. This 2-D IDCT ASICdesign owns best timing performance when compared with other better designsinternationally. Results of design prove to be excellent.    

15.  调节阀流量系数与可调比关系的研究  被引次数:3
   程怀济《自动化仪表》,2000年第21卷第1期
   The relationship betweenflow coefficient and turndown ratio is discussed based on the requirements of practicalapplicationsThus itis stated that the turndown ratio might be considered as the characteristic parameter ofthe flow characteristic curveOn this basis the difference between the National Standard and InternationalStandard in regulations of the deviation of flow coefficient is statedThrough relevant calculationsthe demerits existing inNational Standard and product design are revealed    

16.  基于双阈值法的超声辊型在线检测的研究  
   胡春海《自动化仪表》,2000年第21卷第1期
   To eliminate the errorof distance measurement caused by amplitude change from signal attenuationthe method based on dualthresholds is introducedThus the precise ultrasonic measurement is accomplishedCombining wiht the mechanical scanning the on-linedetection of roller shape is implemented    

17.  不同衬底上低温生长GaN形貌的AFM观察  
   曹传宝  Attolini G  Fornari R  Pelosi C《北京理工大学学报(英文版)》,1999年第8卷第2期
    Aim To study the relationship between the substratetemperature and the morphology and properties of GaN. Methods Applyingthe hydride chemical vapor deposition method, GaN films were deposited on different kindsof substrates, including sapphire, Si(111),Si(100),GaAs and GaP(111) both on the P faceand the Ga face. The growth was performed at low temperatures of below 700. XRD, Hall measurement,cathodoluminescence (CL) and atomic force microscopy (AFM) were used to characterise thefilm properties. Results It was found that the temperature and the natureof substrate materials influence the layer morphology. Conclusion Theanalysis shows that no apparent relationship exists between the optical properties andlayer morphology.    

18.  H∞ Theory and its Application to the Position of Rolling Mill Control System  被引次数:1
   Jie Dong  Chaonan Tong  Kaixiang Peng《北京科技大学学报(英文版)》,1999年第6卷第3期
   The controller designed according to classical or modern control theory will not satisfy the performance requirements when the controlled object in industrial field can not be described by exact mathematical model or the disturbance of the controlled system. In order to make the controlled system stable and having good performance, H∞ control theory was put forward to solve this practical problem. Taking the position of a rolling mill as the controlled object, it was rectified by optimal engineering way. Then, three different plans were put forward according to Bang-Bang control, LQ control and H∞ control, respectively. The result of the simulation shows that the controller designed according to H∞ method whose robust performance and ability to restrain colors disturbance is satisfactory.    

19.  约束系统特性对乘员碰撞响应影响的仿真研究  
   孙立清  林逸  孙逢春《北京理工大学学报(英文版)》,1999年第8卷第2期
    Aim To study the influence of restraint system performanceupon the occupant's response during impact, and provide a scientific base for occupantrestraint system design. Methods In the light of basic theory ofmultibody system dynamics and impact dynamics on the basis of classical theory of impact,R-W method is adopted to construct the vehicle-occupant system model consisting offourteen rigid bodies, thirty seven DOFs and slip joints for the simulation. A softwarenamed SVC3D(3-dimensional simulation of vehicle crash) is developed in the FORTRANlanguage. Results The results of simulation have a good coincidence withthose of tests and the restraint system with low elongation webbing and equipped withpretensioner provides better restraint effect for the occupant. Conclusion Themodel of vehicle-occupant multibody system and SVC3D are suitable for use. Occupant shouldbe belted with low elongation webbing to a certain degree and occupant restraint systemshould be equipped with pretensioner.    

20.  节理岩体弹塑性动态有限元分析  被引次数:1
   郭文章  冯顺山  王海福《北京理工大学学报(英文版)》,1999年第8卷第2期
    Aim To study the elastic-plastic dynamical constitutiverelations about a jointed rock mass under explosion load and its computer simulation. MethodsStress history is taken into account and stresses will follow changes in time during aperiod of explosion load. According to the principle of static force balance, thecorresponding nodal concentrated force is calculated and the nodal displacement iscounted. The elastic-plastic dynamic finite element equations are thus obtained. ResultsA finite element method is given for a jointed rock mass under explosion load. ConclusionThe problem of large plastic deformation for jointed rock mass on blasting was efficientlyresolved through dynamic finite element analysis and the range of damages by blastingsimulated, and this pushes forward the problem to engineering practice.    

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号