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An output delay approach to fault estimation for sampled-data systems

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Science china(Information Sciences) 2012年第9期55卷 2128-2138页

作者： WEN ChengLin 1,QIU AiBing 2 & JIANG Bin 3 1 Institute of Information and Control,Hangzhou Dianzi university,Hangzhou 310018,china 2.school of electrical engineering,nantong university,nantong 226019,china 3 College of Automation engineering,Nanjing university of Aeronautics and Astronautics,Nanjing 210016,china 1. Institute of Information and Control Hangzhou Dianzi University Hangzhou 310018 China2. School of Electrical Engineering Nantong University Nantong 226019 China3. College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

The problem of fault estimation for a class of non-uniformly sampled-data systems is investigated from the time delay point of view in this ***,the output delay approach is employed to model the sampled-data system as a continuous-time one with time-varying delay ***,based on the analysis of the inapplicability of the adaptive fault diagnosis observer in such class of time-delay systems,a novel augmented fault estimation observer design method is proposed to guarantee the exponential convergence of the estimation ***,an extension to the case of time varying fault estimation for the noisy sampled-data systems is ***,simulation results of a flight control system are presented to demonstrate the effectiveness of the proposed method.

关键词： fault estimation non-uniformly sampled-data augmented observer output delay

Entropy Assessment on Environmental Influence of Condense Heat in Recovery System in Air-Conditioning Refrigerating Machine

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湖南大学学报（自然科学版） 2009年第S1期36卷 96-101页

作者： TANG Wen-wu1,2,WANG Han-qing1,2(1.school of Energy Science and engineering,Central South university,Changsha,Hunan 410083,china 2.school of Civil engineering,Hunan university of Technology,Zhuzhou,Hunan 412008,china) school of Energy Science and engineering Central South University Changsha 410083 China school of Civil engineering Hunan University of Technology Zhuzhou 412008 China

This paper presented an entropy evaluation method for the influences of condense heat recovery system on the *** at the damage of the condense heat to the environment,an entropy of resource loss and an emission entropy from the condense heat recovery system in the air conditioning refrigerating machine were *** the evaluation of the entropies,we developed a new algorithm for the parameter identification,called the composite influence coefficient,based on the Least Squares Support Vector Machine *** simulation,the numerical experiments shows that the Least Squares Support Vector Machine method is one of the powerful methods for the parameter identification to compute the damage entropy of the condense heat,with the largest training error being-0.025(the relative error being-3.56%),and the biggest test error being 0.015(the relative error being 2.5%).

关键词： air-conditioning refrigerating machine condense heat entropy evaluation LS-SVM

Design,analysis and control of hybrid excited doubly salient stator-permanent-magnet motor

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Science china(Technological Sciences) 2010年第1期53卷 188-199页

作者： ZHU XiaoYong1,2 & CHENG Ming1 1 engineering Research Center for Motion Control of MOE,school of electrical engineering,Southeast university,Nanjing 210096,china 2.school of electrical and Information engineering,Jiangsu university,Zhenjiang 212013,china 1. engineering Research Center for Motion Control of MOE School of Electrical Engineering Southeast University Nanjing 210096 China2. School of Electrical and Information Engineering Jiangsu University Zhenjiang 212013 China

In this paper,a new hybrid excited doubly salient stator-permanent-magnet motor is proposed,where both permanent magnets and DC field windings are located in the *** theory,the mathematical model and design method of the motor are *** corresponding output power equation and the relationship between the flux control capability and the extended speed range are deduced in *** using an efficient "one-step" three-dimensional(3D) finite element method,the electromagnetic performances are analyzed,in which the leakage flux outside the stator circumference and end-effect are taken into *** on the operation principle of the motor,the control strategy and scheme are developed and implemented *** experimental results and finite element analysis show that the proposed motor not only maintains the advantages of doubly salient permanent magnet motors,but also offers high energy efficiency over a wide speed range,which makes the motor an interesting candidate for electric vehicles.

关键词： stator permanent magnet motor hybrid excitation doubly salient finite element method flux weakening control

The Study on the Microstructure and Mechanical Properties of 400MPa Grade Bar Prepared by Controlled Cooling After Finish Rolling

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Journal of Iron and Steel Research International 2011年第S1期18卷 610-614页

作者： ZHANG Jun-wei 1,DING Lei 1,XIAO Yi 2,3,HU Xiao-dong 1,HU Lin 1 (1.school of Materials and Metallurgy,university of Science and Technology Liaoning,Anshan 114051,Liaoning,china 2.Baosteel nantong Co Ltd.,nantong 226002,Jiangsu,china 3.school of electrical engineering,Anhui university of Technology,Maanshan 243002,Anhui,china) Univ Sci & Technol Liaoning Sch Met & Mat Anshan 114051 Liaoning Peoples R China Baosteel nantong Co Ltd Nantong 226002 Jiangsu Peoples R China Anhui Univ Technol Sch Elect Engn Maanshan 243002 Anhui Peoples R China

The production process of bars in Baosteel nantong *** adjusted by both decreasing heating temperature and adding controlling cooling procedure after finish rolling for upgrade of bars.A set of water cooling system was also installed behind the finishing ***-line tests were conducted,and then the microstructure and mechanical properties of the bars with HRB335 composition and φ22mm diameter were *** results showed that the microstructures of the bar cooled by water were ferrite and pearlite with grain sizes of 8.5 to 12 grades,which were finer than that of the bar without water *** the thin outer layer microstructures of the bar cooled by water were mainly tempered sorbite with small amount of tempered *** average yield strength R eL and tensile strength R m of the bars with water cooling increased 105MPa and 73MPa respectively compared with those of the bars without water *** reason of this strengthening was attributed to the synthetic role of fine grains and phase transformation and precipitation *** addition,The ration of R m /R eL could be higher than 1.25,which is the request of earthquake-proof performance for HRB400E,only when the self-tempering temperatures of the bars were higher than 640℃.

关键词： controlled cooling hot rolling bar fine grain strengthening self-tempering

Robust Decentralized Sliding Mode Control for Uncertain Stochastic Systems with Time Delays

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Robust Decentralized Sliding Mode Control for Uncertain Stoc...

2011 Chinese Control and Decision Conference（CCDC）

作者： Xiaomei Zhang is with the school of Electronics and Information,nantong university,nantong 226019,china Xiaofei Qian and Guoping Lu are with the school of electrical engineering,nantong university,nantong 226019,china

This paper is concerned with the problem of robust stabilization for uncertain stochastic delay systems with interconnections via decentralized sliding mode *** less restrictive sufficient conditions for the existence of decentralized sliding surfaces are given in terms of linear matrix inequalities,by which the decentralized sliding mode controllers ensuring the reachability of the specified decentralized sliding surfaces are designed.A numerical example is included to verify the validity of the developed controller.

关键词： Sliding mode control decentralized control stochastic systems time delays

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一种雾天视觉图像增强新算法

湖南科技大学学报(自然科学版) 2010年第3期25卷 85-88页

作者：曾飞南通大学电气工程学院

通过对基于移动模板的雾天图像增强算法研究,针对其难以匹配模板内景物深度突变信息问题,提出了一种基于幂函数的自适应加权部分重叠直方图均衡(POSHE)改进算法.该方法首先设定移动模板大小,利用幂函数构造相应维数的自适应权矩阵,并引... 详细信息

通过对基于移动模板的雾天图像增强算法研究,针对其难以匹配模板内景物深度突变信息问题,提出了一种基于幂函数的自适应加权部分重叠直方图均衡(POSHE)改进算法.该方法首先设定移动模板大小,利用幂函数构造相应维数的自适应权矩阵,并引入子块直方图均衡得到变换函数,最后将邻域内子块变换函数加权求和,得到当前子块的变换函数,实验结果表明,该方法能有效增强雾天图像局部纹理细节,同时抑制噪声,具有较好的通用性和实用性.

关键词：幂函数雾天图像自适应图像增强直方图均衡

Decentralized H-infinity state feedback control for discrete-time singular large-scale systems

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控制理论与应用（英文版） 2010年第2期8卷 200-204页

作者： Songlin WO 1 , Yun ZOU 2 , Shengyuan XU 2 (1.school of electrical and Information engineering, Jiangsu Teachers university of Technology, Changzhou Jiangsu 213001, china 2.school of Automation, Nanjing university of Science and Technology, Nanjing Jiangsu 210094, china) school of electrical and Information engineering Jiangsu Teachers University of Technology Changzhou Jiangsu China school of Automation Nanjing University of Science and Technology Nanjing Jiangsu China

The decentralized H-infinity control problem for discrete-time singular large-scale systems is considered. Based on the bounded real lemma of discrete-time singular systems, a sufficient condition for the existence of decentralized H-infinity controller for discrete-time singular large-scale systems is presented in terms of the solvability to a certain system of linear matrix inequalities by linear matrix inequality (LMI) approach, and the feasible solutions to the system of LMIs provide a parameterized representation of a set of decentralized H-infinity controller. The given example shows the application of the method.

关键词： Discrete-time singular large-scale system Linear matrix inequality (LMI) Decentralized H-infinity control

Analysis of Micro Thermal Environment for Residential District Planning

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湖南大学学报（自然科学版） 2009年第S1期36卷 51-54页

作者： ZHANG Wei-jie1,QI Jing2,JIN Wen2(1.Institute of Urban Construction,Hebei university of engineering,Handan,Hebei 056038,china 2.school of Architecture,Hebei university of engineering,Handan,Hebei 056038,china) Institute of Urban Construction Hebei University of Engineering Handan 056038 China school of Architecture Hebei University of Engineering Handan 056038 China

This paper focused on residential district planning *** GIS and SketchUp software,a common digital relief map model of a residential district was created,and the air distribution(both velocity and temperature)within this residential district was established by CFD ***,the velocity and temperature of the air at any location within the residential district,as well as the worse flow area and overheat area can be clearly *** index of micro thermal environment for the air distribution evaluation was *** on a certain residential district planning model,from the air parameters of the micro environment at any location within the residential district,such as air velocity and air temperature,the index of micro thermal environment was obtained by certain principles and data processing *** this index,the residential district planning scheme was evaluated corresponding to the thermal characteristics of the residential *** this index is not good enough or unsatisfied,the residential district planning idea and process can be changed or improved accordingly in order to get a better thermal characteristics of the residential district judged by the established evaluation index system.

关键词： residential district planning micro thermal environment micro thermal environmental index CFD SketchUp

Preparation of Granulated Adsorption Material of Water-quenched Slag/rectorite Composite for Removal of Cu(Ⅱ)Ions from Copper Smelter Wastewater

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Journal of Wuhan university of Technology(Materials Science) 2008年第3期23卷 372-375页

作者：王湖坤 school of Chemistry and Environmental engineering Hubei Normal University school of Resources and Environmental engineering Wuhan University of TechnologyWuhan 430070China

The preparation of granulated adsorption material of water-quenched slag/rectorite composite and the treatment of Cu （ Ⅱ ）-containing copper smelter wastewater with the adsorption material were studied. The experimental results showed that under the conditions with the mass ratio of water-quenched slag to rectorite of 1：1, 10% additive of industrial starch （IS）, and 50% water, and a calcination temperature of 400 ℃, the granulated adsorption material prepared had a density of 1.06 kg/m^3, a porosity of 62.29%, water absorption rate of 58.82%, and compressive strength of 2.22 MPa. The efficiency of wastewater treatment was the best, whereas the rate of spallation loss was low. Under the conditions of natural pH, with the addition of the granulated adsorption material of 0.05 g/mL, a reaction time of 40 minutes, and temperature of 25 ℃, the efficiency of the granulated adsorption material for the removal of Cu （ Ⅱ ） ions from the copper smelter wastewater attained 98.2%, and the quality indexes of the wastewater after treatment conformed with the first level of integrated wastewater discharge standard （GB8978-1996）. The reclamation of the used granulated adsorption material was carried out by de-sorption of the Cu （ Ⅱ） ions from the surface with 1 mol/L sodium chloride solution. The de-sorption rate was 96.4%, and the adsorption material can be reused many times to treat copper smelter wastewater.

关键词： water-quenched slag rectorite granulation reclamation copper smelter wastewater