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第24届中国控制与决策会议

作者： Jiusheng Bao 1,2 , Minming Tong 3 , Zhencai Zhu 1 , Yan Yin 1 1. School of mechanical and electrical engineering, china university of mining and technology, xuzhou, 221116, china 2. Mobile Postdoctoral Station for Control Science and engineering, china university of mining and technology, xuzhou, 221116, china 3. School of Information and electrical engineering, china university of mining and technology, xuzhou, 221116, china

This paper aims at improving the braking ability and reliability of disc brakes. Based on some braking tests of the disc brake, an intelligent forecasting model for its tribological properties was established firstly by the artificial neural network （ANN） technology. Its input layer contains three braking cells: braking pressure, sliding velocity and surface temperature. And its output layer contains three tribological cells: friction coefficient and its stability coefficient, and wear rate. Secondly, an intelligent forecasting system was developed based on the model. It is mainly composed of three parts: sensing system, data collecting system, and data computing system. Finally, the disc brake used in mine hoists was tested on the system as an example. It is shown that the experimental data which contain nonlinear relationships between the braking conditions and tribological properties of disc brake are theoretical foundations of the tribological forecasting. The ANN is especially suitable for establishing the tribological forecasting model. And the optimized BP network is proved as a simple and effective computing model. The intelligent model and system established in this paper has quite favorable forecasting ability and practicability. By the contrast, it has higher precision for forecasting of the friction coefficient and its stability coefficient than the wear rate. The difference was attributed to man-made testing errors of data samples during tribological experiments.

关键词： Intelligent Forecasting Tribological Properties Disc Brake Braking Condition ANN

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Effect of Addition of Sodium Dodecyl Sulfite on Physical Properties of Wheat Gluten Films

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Journal of Wuhan university of technology(Materials Science) 2005年第2期20卷 15-19页

作者：曾瑜薇 School of Foreign Language Hubei University of TechnologyWuhan 430068China Assoc.Prof

Films were made from the wheat glutens treated with 5%,10%,15%,20%,25% and 30%(wt% of gluten) of sodium dodecyl sulfite (SDS) in order to improve the properties of the films. Glycerol was used as a *** addition of SDS in wheat glutens prior to forming films significantly increased the elongation at break(E) (P2) and P_(CO_2) of films from gluten treated with SDS was noticed. Although SDS-treated gluten film was slightly more yellow and darker than control one, it was not visually detrimental. It is indicated that the treatment with SDS prior to forming films greatly enhances the mechanical properties of wheat gluten *** obivous improvement in water vapor permeability and extensibility of gluten films means that the use of SDS is a potential choice for improving properties of gluten films. The edible film was used to preserve tomatoes. The experimental results show that the shelf life of tomatoes coated with the edible film is extended, and the nutritional quality is kept well.

关键词： wheat gluten sodium dodecyl sulfite (SDS) tensile strength (TS) elongation at break(E) water vapor permeability(WVP) tomato preservation

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Effects of rapid solidification on the microstructure and microhardness of a lead-free Sn-3.5Ag solder

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Rare Metals 2006年第4期25卷 365-370页

作者： SHEN Jun LIU Yongchang Han Yajing GAO Houxiu college of mechanical engineering Chongqing University Chongqing 400044 China college of Materials Science and engineering Tianjin University Tianjin 300072 China

A lead-free Sn-3.5Ag solder was prepared by rapid solidification technology. The high solidification rate, obtained by rapid cooling, promotes nucleation, and suppresses the growth of Ag3Sn intermetallic compounds （IMCs） in Ag-rich zone, yielding fine Ag3Sn nanoparticulates with spherical morphology in the matrix of the solder. The large amount of tough homogeneously-dispersed IMCs helps to improve the surface area per unit volume and obstructs the dislocation lines passing through the solder, which fits with the dispersion-strengthening theory. Hence, the rapidly-solidified Sn-3.5Ag solder exhibits a higher rnicrohardness when compared with a slowly-solidified Sn-3.5Ag solder.

关键词： lead-free solder nanoparticulate rapid solidification intermetallic compounds dispersion-strengthening effect

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Repetitive learning control of nonlinear systems over finite intervals

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Science china(Information Sciences) 2010年第1期53卷 115-128页

作者： SUN MingXuan1, WANG DanWei2 & CHEN PengNian3 1college of Information engineering, Zhejiang university of technology, Hangzhou 310014, china 2School of electrical and Electronic engineering, Nanyang Technological university, Singapore 639794 3Department of Mathematics, china Institute of Metrology, Hangzhou 310018, china college of Information engineering Zhejiang University of Technology Hangzhou China School of electrical and Electronic engineering Nanyang Technological University Singapore Singapore Department of Mathematics China Institute of Metrology Hangzhou China

Iterative learning control requires initial repositioning, while the time functions to be learned should be of periodicity in repetitive control. However, there are cases in practice where the time-varying unknowns are not periodic but repetitive, and repetitive learning control is applicable with avoidance of initial repositioning. In this paper, repetitive learning control designs are presented for a broader class of nonlinear systems over finite intervals. The Freeman formula is modified and used for stabilization of the nominal nonlinear time-varying system undertaken. The global stability of the learning system and asymptotic convergence of the tracking error are established through analysis of both partially and fully saturated learning algorithms, respectively. The repetitive learning control method is theoretically shown to be effective in dealing with time-varying parametric uncertainties.

关键词： Initial condition problem convergence iterative learning control repetitive control repetitive learning control nonlinear systems

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Tribological Properties Prediction of Brake Lining for Automobiles Based on BP Neural Network

Tribological Properties Prediction of Brake Lining for Autom...

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2010 Chinese Control and Decision Conference

作者： Yan Yin~1,Jiusheng Bao~1,Lei Yang~2 1.School of mechanical and electrical engineering,china university of mining and technology,xuzhou,221116 2.Xuhai college,china university of mining and technology,xuzhou,221008

＜正＞By many tribological experiments of brake lining for automobiles,the original experimental data were firstly obtained,which contains the influencing rules of braking conditions on tribological *** on the artificial neural network technology and the experimental data specimens,the BP neural network model was established to predict the tribological *** parameters of braking conditions（braking pressure,sliding velocity and surface temperature） were selected as input vectors,and two parameters of tribological performance（friction coefficient and wear rate） were selected as output *** contrast of prediction values and experimental results,it is found that the neural network can predict properly the influencing rules of braking conditions on tribological *** is more,the neural network has quite favorable ability for predicting of friction *** it has bad ability for predicting of wear rate,especially when the pressure,velocity and temperature are *** a whole,this paper has proved that it is feasible and valuable to use neural network for predicting tribological properties of friction materials.

关键词： neural network friction coefficient wear rate prediction brake lining

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Energy-Based Prediction of Low Cycle Fatigue Life of High-Strength Structural Steel

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Journal of Iron and Steel Research International 2012年第10期19卷 47-53页

作者： LUO Yun-rong1,2, HUANG Chong-xiang1, GUO Yi2, WANG Qing-yuan1 (1. college of Architecture and Environment, Sichuan university, Chengdu 610065, Sichuan, china 2. college of mechanical engineering, Sichuan university of Science and engineering, Zigong 643000, Sichuan, china) college of Architecture lind Environment Sichuan University Chengdu Sichuan China college of mechanical engineering Sichuan University of Science and Engineering Zigong Sichuan China

Energy-based models for predicting the low-cycle fatigue life of high-strength structural steels are presented. The models are based on energy dissipation during average of cycles, cycles to crack propagation and total cycles to failure. Plastic strain energy per cycle was determined and found as an important characteristic for initiation and propagation of fatigue cracks for high-strength structural steels. Fatigue strain-life curves were generated using plastic energy dissipation per cycle (loop area) and compared with the Coffin-Manson relation. Low cycle fatigue life was found similar from both methods. The material showed Masing-type behavior. The cyclic hysterisis energy per cycle was calculated from cyclic stress-strain parameters. The fracture surfaces of the fatigue samples were characterized by scanning electron microscope and the fracture mechanisms were discussed.

关键词： low cycle fatigue high-strength steel energy-based model fatigue life

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Dynamic scheduling model of computing resource based on MAS cooperation mechanism

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Science in china(Series F) 2009年第8期52卷 1302-1320页

作者： JIANG WeiJin1,2, ZHANG LianMei3 & WANG Pu4 1 School of Computer and Electronic engineering, Hunan university of Commerce, Changsha 410205, china 2 School of Information engineering, Xiangtan university, Xiangtan 411000, china 3 electrical engineering college, Wuhan university, Wuhan 430072, china 4 School of Commerce, Central South university, Changsha 410083, china School of Computer and Electronic engineering Hunan University of Commerce Changsha China School of Information engineering Xiangtan University Xiangtan China electrical engineering college Wuhan University Wuhan China School of Commerce Central South University Changsha China

Allocation of grid resources aims at improving resource utility and grid application performance. Currently, the algorithms proposed for this purpose do not fit well the autonomic, dynamic, distributive and heterogeneous features of the grid environment. According to MAS （multi-agent system） cooperation mechanism and market bidding game rules, a model of allocating allocation of grid resources based on market economy is introduced to reveal the relationship between supply and demand. This model can make good use of the studying and negotiating ability of consumers＇ agent and takes full consideration of the consumer＇s behavior, thus rendering the application and allocation of resource of the consumers rational and valid. In the meantime, the utility function of consumer is given; the existence and the uniqueness of Nash equilibrium point in the resource allocation game and the Nash equilibrium solution are discussed. A dynamic game algorithm of allocating grid resources is designed. Experimental results demonstrate that this algorithm diminishes effectively the unnecessary latency, improves significantly the smoothness of response time, the ratio of throughput and resource utility, thus rendering the supply and demand of the whole grid resource reasonable and the overall grid load balanceable.

关键词： multi-agent system (MAS) resource scheduling model evolutionary game cooperation mechanism utility function

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MATHEMATICAL MODEL OF MILLING TEMPERATURE AND TEMPERATURE FIELD ANALYSIS FOR THREE-DIMEN-SIONAL COMPLEX GROOVE MILLING INSERT

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Chinese Journal of mechanical engineering 2003年第4期16卷 340-343页

作者： Li ZhenjiaDong LihuaTan GuangyuGuo QiangCheng Yaonancollege of mechanical engineering,Harbin university of Scienceand technology,Harbin 150080, china college of mechanical engineering Harbin University of Science and Technology Harbin 150080 China

The mathematical model on the temperature of the waved-edge is constructedaccording to Jaeger's theory of moving solid and based on the used temperature model of the flatinsert. It is possible to forecast the milling temperature through programming. The comparableexperiments have been done between the two new three-dimension groove inserts (waved-edge insert,great edge insert) and flat fake insert. The theoretic forecast is in good agreement with theexperimental result. According to the cutting conditions, the boundary condition of finite elementanalysis on cutting temperature field is established, and the three-dimensional temperature fieldsof inserts with grooves are analyzed by FEM, so as to offer a reference basis for the design andoptimization of insert grooves.

关键词： Three-dimensional groove milling insert Cutting temperature mathematicalmodel Temperature field Finite element analysis

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The NC system based on positioning controller for Spin Riveting Machine

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微计算机信息 2005年第2期 19-20页

作者： Ou,Yuanxian Liu,Wangyu(college of mechanical engineering, South china university of technology,510641)

This article discusses in details the NC system based on positioning controller, PLC and graphic operation terminal of Mitsubishi. It has been used successfully in the spin riveting machine we developed.

关键词： Numerical control system positioning controller riveting machine.Cultural heritage marking code: TG659The inside diagram divides into section the number:B

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Formation and vanishment of the intragranular microstructure in Si_2N_2O/Si_3N_4 nanocomposites

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Science china(Technological Sciences) 2010年第1期53卷 284-286页

作者： LUO JunTing,LIU RiPing & QI Li State Key Laboratory of Metastable Materials Science and technology,college of mechanical engineering,Yanshan university,Qinhuangdao 066004,china State Key Laboratory of Metastable Materials Science and technology College of Mechanical Engineering Yanshan University Qinhuangdao China

Si2N2O/Si3N4 nanocomposites were fabricated by liquid phase sintering of amorphous nano-sized silicon nitride *** intragranular microstructure was observed and *** microstructure's β-Si3N4 was formed in Si2N2O matrix at the sintering temperature higher than 1650°*** was discovered that intragranular microstructure could also disappear by transformation during high temperature *** possible mechanisms of the disappearance of intragranular microstructure were *** effect of intragranular microstructure on main mechanical properties was also investigated.

关键词： Si2N2O/Si3N4 nanocomposite intragranular microstructure transformation vanishment

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