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Real-time Non-linear Target Tracking Control of Wheeled Mobile Robots

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武汉理工大学学报 2006年第S3期28卷 861-866页

作者： YU Wenyong School of mechanical engineering,Huazhong university of Science & {3.,wuhan 43.074,china, School of mechanical engineering Huazhong University of Science & TechnologyWuhan 430074China

A control strategy for real-time target tracking for wheeled mobile robots is *** a modified Kalman filter for environment perception,a novel tracking control law derived from Lyapunov stability theory is *** of linear velocity and angular velocity with mechanical constraints is *** proposed control system can simultaneously solve the target trajectory prediction,real-time tracking,and posture regulation problems of a wheeled mobile *** results illustrate the effectiveness of the proposed tracking control laws.

关键词： wheeled mobile robots motion control dynamic tracking

Complex genetic algorithm in continuous space

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Chinese Science Bulletin 1999年第10期44卷 954-960页

作者： LI Qiang and ZHOU Ji Department of mechanical engineering, Inner Mongolia Polytechnic university, Hohhot 010062,{3. CAD Center, Huazhong university of Science and technology , wuhan 43.072,{3. Department of mechanical engineering Inner Mongolia Polytechnic University Hohhot China CAD Center Huazhong University of Science and Technology Wuhan China

A new artificial intelligent optimization method, complex genetic algorithm, is presented, and the theoretical analysis for the effective optima-seeking mechanism of the algorithm is finished. The example calculation ... 详细信息

关键词： continuous space complex genetic algorithm artificial intelligent optimization.

MATRIX ALGEBRA ALGORITHM OF STRUCTURE RANDOM RESPONSE NUMERICAL CHARACTERISTICS

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Chinese Journal of mechanical engineering 2003年第2期16卷 149-152页

作者： Mei YulinWang XiaomingWang DelunDepartment of mechanical engineering,Dalian university of {3.,Dalian 116024,china Department of mechanical engineering Dalian University of Technology Dalian 116024

A new algorithm of structure random response numerical characteristics, namedas matrix algebra algorithm of structure analysis is presented. Using the algorithm, structurerandom response numerical characteristics can easily be got by directly solving linear matrixequations rather than structure motion differential equations. Moreover, in order to solve thecorresponding linear matrix equations, the numerical integration fast algorithm is presented. Thenaccording to the results, dynamic design and life-span estimation can be done. Besides, the newalgorithm can solve non-proportion damp structure response.

关键词： matrix algebra algorithm structure random response numericalcharacteristics numerical integration fast algorithm non-proportion damp

Gear Fault Diagnosis Based on Rough Set and Support Vector Machine

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武汉理工大学学报 2006年第S3期28卷 1046-1051页

作者： TIAN Huifang SUN Shanxia School of mechanical and Electrical engineering,wuhan {3. of technology,wuhan 43.070,china, School of mechanical and Electrical engineering Wuhan University of TechnologyWuhan 430070China

By introducing Rough Set Theory and the principle of Support vector machine,a gear fault diagnosis method based on them is ***,diagnostic decision-making is reduced based on rough set theory,and the noise and redundancy in the sample are removed,then,according to the chosen reduction,a support vector machine multi-classifier is designed for gear fault ***,SVM’training data can be reduced and running speed can *** shows its accuracy and effi- ciency of gear fault diagnosis.

关键词： rough set support vector machine fault diagnosis multi-classifier

Microstructure and formation mechanism of twins of laths of austenite with high nitrogen

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Science china(Technological Sciences) 2007年第6期50卷 755-764页

作者： WU CuiLan1,2 & LUO ChengPing2 1 Center for High Resolution Electron Microscopy, college of Materials Science and engineering, Hunan university, Changsha 410082,{3. 2 college of mechanical engineering, South{3. university of technology, Guangzhou 510641,{3. 1. Center for High Resolution Electron Microscopy College of Materials Science and Engineering Hunan University Changsha 410082 China 2. college of mechanical engineering South China University of Technology Guangzhou 510641 China

The microstructure of composite diffusion layer of the nitrided and chromized 0.2% carbon steel is investigated using TEM and EDS. It is found that laths of austenite with high nitrogen (γ N) precipitate from α-ferrite matrix in the deeper zone of the diffusion layer. These γ N laths are all twins, with their {111} twinning planes parallel to the lath axis, thus forming a characteristic "back-to-back" morphology. There are two types of γN lath. The first is a genuinely {111} twin, and γ N and α keep the accurate K-S relationship, and each γ N and α form a sharp and smooth γ N/α inter- face of {335}γN//{341}α, namely habit plane {335}fcc. The second is a pseudo-twin, with micro-twins {111} or faults formed within the two twin components. Localized lattice deformation (relaxation) seems to have occurred at the interfaces of the second type of γ N due to the formation of micro-twins or faults within the twin components. These micro-twins or faults make the orientation relationship (OR) between each of the γN and the α-matrix deviate from the accurate K-S OR, and the OR between two γ N twin components deviate from the genuine {111} twin relation- ship. In addition, the γ N/α interface of the second type of γ N is not as sharp or smooth as that of the first one.

关键词： austenite containing nitrogen, twins, steel 20, nitriding, composite chromizing

A NOVEL INTERPRETATION OF CONCENTRATION DEPENDENCE OF VISCOSITY OF DILUTE POLYMER SOLUTION

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Chinese Journal of Polymer Science 2000年第1期18卷 57-67页

作者： Yan Pan Rong-shi Cheng college of Material Science and engineering, South china {3. of technology, Guangzhou 510641, china college of Chemistry and Chemical engineering, Nanjing {3., Nanjing 210093. china S china Univ Technol Coll Mat Sci & Engn Guangzhou 510641 Peoples R China Nanjing Univ Coll Chem & Chem Engn Nanjing 210093 Peoples R China

The concentration dependence of the reduced viscosity of dilute polymer solution is interpreted in the light of a new concept of the self-association of polymer chains in dilute solution. The apparent self-association constant is defined as the molar association constant divided by the molar mass of individual polymer chain and is numerically interconvertible with the Huggins coefficient. The molar association constant is directly proportional to the effective hydrodynamic volume of the polymer chain in solution and is irrespective of the chain architecture. The effective hydrodynamic volume accounts for the non-spherical conformation of a short polymer chain in solution and is a product of a shape factor and hydrodynamic volume. The observed enhancement of Huggins coefficient for short chain and branched polymer is satisfactorily interpreted by the concept of self-association. The concept of self-association allows us to predict the existence of a boundary concentration C-s(dynamic contact concentration) which divides the dilute polymer solution into two regions.

关键词： self-association polymer solution viscosity concentration dependence

Numerical simulation of the transient multiphase field during plasma deposition manufacturing composite materials

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Science china(Physics,Mechanics & Astronomy) 2009年第4期52卷 508-517页

作者： KONG FanRong1,2,ZHANG HaiOu1 & WANG GuiLan3.1 State Key Laboratory of Digital Manufacturing Equipment and technology,Huazhong university of Science and technology,{3. 43.074,china 2 Research Center for Advanced Manufacturing,Southern Methodist university,3.01 Dyer Street,Dallas,Texas 75205,USA 3.college of Material Science and engineering,Huazhong university of Science and technology,{3. 43.074,china 1. State Key Laboratory of Digital Manufacturing Equipment and technology Huazhong University of Science and Technology Wuhan 430074 China 2. Research Center for Advanced Manufacturing Southern Methodist University 3101 Dyer Street Dallas Texas 75205 USA 3. college of Material Science and engineering Huazhong University of Science and Technology Wuhan 430074 China

A solid/liquid/gas unified model has been developed to investigate the gradient composition formation during the plasma deposition manufacturing(PDM) composite materials process. In this model,an enthalpy porosity model was applied to deal with the melting and solidification of the deposited layer,and a level-set approach was introduced to track the evolution of the free surface of the molten pool and the deposited layer. Moreover,complicated physical phenomena occurring at the liquid/gas interface,including forced convection heat loss,heat emission and plasma heat source,have been incorporated into the governing equations by source terms. In this study,the numerical experiment of nickel base alloy powder deposited on the medium steel substrate by PDM technique was implemented based on the staggered grid and SIMPLEC algorithm. Concentration gradient distribution of the solute material at the composite material interface,fluid flow and temperature distribution in the molten pool and the deposited layer have been investigated in detail.

关键词： plasma deposition manufacturing composite material solid/liquid/gas unified model level-set approach

APPROXIMATE SOLUTIONS FOR TRANSIENT RESPONSE OF CONSTRAINED DAMPING LAMINATED CANTILEVER PLATE

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Acta Mechanica Solida Sinica 2010年第4期23卷 312-323页

作者： Liuwei Mao Anwen Wang Mingyong Hu (college of Science, Naval university of engineering, {3. 43.03., china) [a] college of Science Naval University of Engineering Wuhan 430033 China

The series composed by beam mode function is used to approximate the displacement function of constrained damping of laminated cantilever plates, and the transverse deformation of the plate on which a concentrated force is acted is calculated using the principle of virtual *** solving Lagrange＇s equation, the frequencies and model loss factors of free vibration of the plate are obtained, then the transient response of constrained damping of laminated cantilever plate is obtained, when the concentrated force is withdrawn *** theoretical calculations are compared with the experimental data, the results show：both the frequencies and the response time of theoretical calculation and its variational law with the parameters of the damping layer are identical with experimental ***, the response time of steel cantilever plate, unconstrained damping cantilever plate and constrained damping cantilever plate are brought into comparison, which shows that the constrained damping structure can effectively suppress the vibration.

关键词： constrained damping cantilever plate damping laminated plate transient response beam mode function combination

INFLUENCE OF SURFACE HARDENING ON CONTACT FATIGUE LIFE OF NODULAR CAST IRON

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Acta Metallurgica Sinica(English Letters) 1990年第3期3卷 188-193页

作者： TAO Zengyi LUO Jiaming Huazhong university of Science and technology,wuhan,{3. TAO Zengyi,Faculty of Metallic Materials,Dept.of mechanical engineering No.2,Huazhong university of Science and technology,wuhan 43.074,{3.

The influence of laser surface melting and induction hardening on the surface structure,con- tact fatigue life and failure behaviour of the nodular cast iron has been *** con- tact fatigue life can be improved by both laser treatment and induction hardening,but the fail- ure process and type are different from each *** former is due to lumpy and deep spal- ling caused by crack propagation between the quenching zone and the substrate,and the latter is due to nubby and surface flaking caused by the oil wedged action into surface cracks.

关键词： surface hardening contact fatigue life laser melting induction hardening