bluuebunny/crossref_metadata_2025 huggingface dataset:
Impact on Structure and Composition of Carbon Supported PtCuLaOx Membrane Electrode by Acid Treatment
Authors: Yang Bin , Shen Ming Zhe
Published: January 2012

For the use of Fuel Cells in transportation, one of the key points is to reduce Pt loading in Pt/C catalytic electrode. In the study, PtCuLaOx heterogeneous membrane manufactured on the surface of carbonaceous substrates by Ion Beam Sputtering technology, and also was treated by different concentration H2SO4 solution. Moreover, phase composition, Valence state and Pt loading of these electrodes was analyzed, respectively. It was found that content of doping La in catalytic membrane could increase rich-oxygen ability, and PtCuLaOx with Pt loading less than 0.041mg/cm2 (the electrode area), in which its having complicated valence state, indicated that Pt had mutual effect with Cu, La and O, respectively. In addition, through H2SO4 solution treatment and along with increased H2SO4 concentration, the orientation growing of Pt(111) would be promoted, and Pt-Pt interval on surface of PtCuLaOx would reduce owing to Cu was dissolved from (Pt), and average grain size of PtCuLaOx decreased and crystal face spacing steady. Our study indicated that membrane electrodes through Acid treatment could be used in Fuel Cells and made Fuel Cells have low Pt loading and high catalytic activities, simultaneously.
Calculation and Study of the Integrated Emissivity of Cylindrical Cavity
Authors: Wang Jian Hua , Chen Jin Tao , Wang Jing Hui , Yang Wen Tong
Published: January 2012

In this paper, the integrated emissivity of isothermal cylindrical cavity is calculated based on ANSYS finite element method at different wall material emissivity and Cavity length, and are compared with the calculation results of the Monte Carlo method, the average absolute deviation is 0.00045. Meanwhile, this paper presents meshing rules of the cavity bottom surface and the cavity mouth surface, it proposes that the cavity mouth surface is regarded as the equivalent radiant surface, and calculates the integrated emissivity of different positions on the equivalent radiant surface, analyzes the influence of the wall material emissivity, cavity length, the position of radius direction.
The Definition of 3D Full-Information Model of Aircraft Machining Parts
Authors: Qu Li Gang , Zheng Shuang , Han Xiao Guang
Published: January 2012

In order to construct the frame-work of digital product definition for airplane lifecycle, the basic theory and technical hierarchy of the definition of 3D full-information model have been introduced, and the corresponding full-information model is established in the tree method. The result of this work will be the transforming power from traditional manufacturing to digital manufacturing pat-tern.
Optimal Heat Exchanger Network Synthesis via Particle Swarm Optimization
Authors: Wang Ping , Xu Jun Liang , Lu Tao
Published: January 2012

On the basis of superstructure of heat exchanger network (HEN), we established a particle swarm optimization (PSO) model of HEN with no splits, with the target of minimizing investment and operation cost. A typical HEN was solved via a modified particle swarm optimization (PSO). Through comparative of the optimization result, we could know that this method could reach better solution accuracy.
The Schur Complement on Weak Block Diagonally Dominant Matrices and Weak Block H-Matrices
Authors: Liu Shi Hong , Su Hong , Huang Zhuo Hong
Published: January 2012

In this paper, we prove that the Schur complement of Weak block diagonally dominant matrices and weak block H-matrices are Weak block diagonally dominant matrices and weak block H-matrices, respectively.
Design of the CNC Milling Tool Selection System
Authors: Sui Xiu Lin , Hu Na , Zhang Chun Hong
Published: January 2012

Knowledge base of milling feature machining based on relational database is proposed, using knowledge representation of production rules, according to the characteristics of feature machining knowledge. Tool selected reasoning mechanism and reasoning processes is presented basing the installed CNC milling tool database , and further reasoning is based on knowledge, milling tool selection method is implemented based on feature machining knowledge using the forward direction inference strategy .In the paper, a complete system of the selecting milling cutter is established. The system connects not only the theoretical knowledge but the expert’s experiences with the computer applications in order to provide a base of realizing the automatic mechanical processing. By the example of machining tool selection for complex surface, the selection process is described, and the system can select the tools to meet the processing requirements within a shot time, and has good versatility.
Structural Analysis and Weight-Losing Optimization for the Five-Axis Grinding Machine Tool Bed
Authors: Zhang Xiang Lei , Li Fei , Zhang Zhe Shan , Yao Bo Shi , Tan Xiao Qing , He Wen Hui , Yao Bin
Published: January 2012

With the five-axis grinding machine tool bed as the research object, the maximum deformation region can be found after analyzing the static characteristics in the use of the grinder limit positions. Through free modal analysis and constraint modal analysis, the vibration characteristics of each order of the bed can be seen and a point in the maximum deformation region is selected to carry out the harmonic response analysis to predict the sustainable dynamic characteristic. According to the results of analysis, find out the weak areas in the bed and conduct the weight-lowing optimization on the condition of no reduction of static and dynamic characteristic of the bed. This paper draws the conclusion of reduction of weight of 143.42kg and materials of 7.73%.
Analysis of Instant Contact Nonlinear on Round Link Chain Based on Symmetric Penalty Function Method
Authors: Li Wei Kang , Mao Jun , Yang Xin Le
Published: January 2012

In order to analyze deformation and stress state of round link chain which is generated by driving sprocket for sudden loading or starting moment between the chains during the working conditions, the symmetric penalty function method was utilized in contact-impact interface of LS-DYNA program and the finite element software ANSYS/LS-DYNA was used to carry on 3D nonlinear contact analysis of three round link chains, the curves of stress and deformation with varying time were gained by simulating the process of the instant contact-impact of chains. The results show that the largest stress value is appeared on the contacting curved arm of driven round link chain, the second stress value is connecting round link chain, the least stress value is driving round link chain; it is circular shape of the contact area of round link chains and it is the main reasons of damage that the largest stress and deformation values of impact is caused by instant changing loading when time lasts 0.05s, and the series gradually fluctuation of strength is led to fatigue through finite element analysis software. The symmetric penalty function method of finite elements can provide a theoretical basis and simulation methods for analyzing the round link chain driving in a variety of different working conditions under the conditions of contact-impact.
Analysis of C80B Wagon’s Load-Stress Transfer Relation
Authors: Yuan Yu Qing , Li Qiang , Ran Kun
Published: January 2012

In this paper, C80B car body is the research object to study the load-stress transfer relationship that has great influence on the car body structure. First of all, through the test data of line DaTong to Qin Huangdao, the load-time history of C80B car body’s load on center plate, load on draw gear, roll load and torsional load have been obtained, as well as the stress-time history of the body fatigue key parts have been obtained. And the load spectrum and stress spectrum have been made up. Then the finite element analysis of the car body is made. The load-stress transfer coefficient of fatigue key parts on car body could be obtained. Last the load and stress transfer relationship in detail considering the measured data has been analyzed.
Study on Growth of Oxide Scale on High Carbon Steel at High Temperature
Authors: Qiu Hua Xing , Hu Xian Jun , Chen Shao Hui , Fang Feng
Published: January 2012

Abstract：To control the oxide scale on high carbon steel during the manufacture of high carbon steel wire, the structure and the growth process of oxide scale were investigated by using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) , Laser Raman Spectroscopy (LRS) and TGA system. Experimental results show that oxide scale on high carbon steel has a three-layer structure. The oxide scale growth on high-carbon steel can divide into three stages. 1) The growth rate is slow below 780°C. 2) The growth rate increases obviously between 780°C and 950°C and 3) sharp increase beyond 1000°C. The oxidation of high carbon steel obeys a linear law at first and a parabolic law is followed with the increase of oxidation time. The oxide temperature has great effected on the thickness of oxide scale. The proportion of wustite in oxide scale increases with both the oxidation temperature and oxidation time.
Corrosion Properties of Cold Spray Zn-25Al Coating in Marine Environment
Authors: Zhu Qing Jun , Wang Kai
Published: January 2012

Zn-25Al coatings were prepared by cold spray on mild carbon steel Q235. The coatings were studied by potentiodynamic polarization test, corrosion potentials and electrochemical impedance spectrum in natural seawater. The results show that the Ecorr of Zn-25Al coating is -1.01V (SCE) and the Ecorr of Q235 is -0.65V (SCE) at the beginning of the immersion. Self-corrosion potential of Zn-25Al coating is lower than that of Q235. The coatings turn to activity anodic dissolution zone when the potential reaches -1.05V. The coatings changes to passivation zone after the potential reaches -1.01V and the current intensities increase slightly with the potential increasing quickly. Zn-25Al coatings can provide lower protection potential and promising current to protect Q235 from corrosion.
Research on Fluorescence Imaging Detecting System of Intracellular Calcium
Authors: Liu Bao , Zhang Si Xiang , Zhou Wei
Published: January 2012

A new effective imaging detecting system has been used to determinate of intracellular calcium. The fluorescence Image acquisition and analysis was realized with fluorescence imaging detecting system. A designed microfluidic chip has been built. Cell fostering, staining and other operations can be implemented on it. Based on it, a new detecting means was developed for fluorometric measurement. The concentration of intracellular calcium ion can been calculated by using the fluorescence ratio method. A series of experiments were performed by using the detecting system. The experimental results show the ratio of fluorescence intensity was positively correlated to the raising temperature and enhancing shear stress.
Research on Numerical Simulation of Mining Subsidence
Authors: Ji Hong , Yu Xue Yi
Published: January 2012

The strip mining method is proposed to prohibit overlying strata and surface moving. The law of displacement and deformation damage of overlying strata and surface which is a sophisticated process of physical and mechanical dynamics is analyzed in theory. Based on the actual project data, the law is obtained by the numerical simulation with FLAC3D. Moreover, the strip reasonable mining method and interrelated parameters is presented according to the specific geology and mining conditions of coal. It is proved that the strip mining method can avoid geological damage effectively for overlying strata and surface movement in practice.
Design on Falling Weight Impact Test Rig
Authors: Du Jie , Ma Chun Ting
Published: January 2012

Based on Interaction energy of solid ball, the new particle damper is designed which can be used in a high temperature and high shock energy. To verify the design of the damper, a falling weight Impact test rig is designed, a sensor, data acquisition card and computer hardware constitutes a signal test system. Experimental results show that the particle diameter is the biggest impact for the role of the particle damper , the characteristics of the displacement curves are increased at first and then decreased, the opposite effect of the time. At the same time filled with particles and the degree of damping rod embedment also have an impact on energy consumption.
Research on Stem Characteristics of Litchi and End-Effector of Litchi Picking Robot
Authors: Xiang He Ping , Chen Yan , Cai Wei Liang , Zou Xiang Jun
Published: January 2012

In order to design a robot end-effector for picking the litchi, at first, the clamping and cutting characteristics of the litchi stem were measured. Based on the biological characteristics and cultivation growth pattern of litchi, the characteristic of litchi picking mechanism was analyzed, and the relationship between the moving mechanism and cutting mechanism was established. At last, a new type of end-effector for picking the litchi, which consisted of clamping mechanism, moving mechanism and cutting mechanism, was developed. The experimental results showed that the end-effector can satisfy the clamping, moving and cutting requirements when picking the litchi.
Extend the Utilization of Joystick for Visualization, Telemetry and Control on Unmanned Vehicle Development
Authors: Bin Khalid Hasnan , Luhur Budi Saesar , Prima Adhi Yudhistira
Published: January 2012

In this paper, we suggest a different way to improve the utilization of joystick in our daily life, especially for those who commonly use joystick in matlab simulink environment as a controller. By modifying potentiometer that acts as a variable resistor we can process signal from joystick with interfacing it on block in simulink to change to another function (ex. Low-cost sensor) or extend the limitation joystick itself when acts as a controller. With some applied mathematical calibration regarding the functionality for certain condition then the low-cost development approach for unmanned vehicle could be achieved.
A Lagrange Type Polymer Drawing Model of the Melt Blowing Nonwoven Process
Authors: Chen Hua Jun , Chen Ting , Wu Li Li
Published: January 2012

Melt blowing process can produce superfine fibers. In this processs, the polymer is drawn by high velocity hot air. Lagrange method is empolyed to establish and solve the polymer drawing model. The fiber diameter and vibration are predicted with the model. The predicted fiber diameter concides with the experimental data. The fiber vibration becomes larger and larger with the increase of the die-to-collector distance. Computer simulations show that higher initial air velocity and higher initial polymer temperature can producefiner fibers while initial airtemperature contribute little to the polymer drawing.
Ultimate Strength Research of Plates Based on Combined Theory of Strength and Stability Method
Authors: Feng Liang , Tong Fu Shan
Published: January 2012

this paper calculates ultimate strength about simply supported plates based on Combine Theory of Strength and Stability(CTSS for short). Comparing the results of experimental result, the Finite Element Method and empirical Formula, the method is simple and validity to guide the Engineering design. On this base, it is derived that method of buckling analysis by CTSS is the consistent with CCS
Analysis of Mixed-Mode Fatigue Crack Growth under Stress Redistribution at Crack Tips
Authors: Tu Wen Feng , Gao Zeng Liang , Hu Zhao Ji
Published: January 2012

The experiments of mixed-mode I-II fatigue crack growth under stress redistribution at crack tips were conducted with compact specimens made of 16MnR steel. This test consisted of the 1st, the 2nd and 3rd step. When the crack reached a certain length in 1st step, the loading direction was switched to a certain angle. Finally, the loading direction was returned to the original orientation. The stress redistribution of mixed-mode fatigue was formed by altering the loading direction at propagating crack tips. A finite element analysis was also conducted to obtain the and values, and then mixed-mode crack growth parameters were adopted to evaluate the crack growth rate and crack paths. The crack growth paths had a tendency perpendicular and across to the loading axis. Right after the loading direction was changed, the crack growth rate was decreased rapidly, and crack growth paths under the stress redistribution zone (SRZ) were affected.
Numerical Research of Deposits Formation and Influence on the Heat Transfer Process
Authors: Mu Lin , Yin Hong Chao
Published: January 2012

Ash deposition on the heat transfer tubes in the heat recovery steam generator (HRSG) can pose a significant influence on the operating efficiency and operational safety. In this paper a numerical deposition model was developed to predict particle deposition/rebounding in the thermal boundary layer as well as the influence of physical properties of deposits on the heat transfer process. In addition, deposition rate, deposits distribution and variations of deposits with the running time were also predicted by numerical simulation method. Compared with the other 4 sub areas, a strong deposition tendency along the running time occurred in the HR3. The predictive results from the ash deposition model showed that the HRSG had a significant increase in average furnace temperature and outlet temperature, and a decline in overall heat transfer efficiency as the deposits initiated, grew and maturated. In general, the predicted results is in good agreement with the field measurements.
Preparation and Antioxidant Capacities of Oligochitosan-Collagen Peptide Complexe
Authors: Wang Bin , Wang Yan , Li Zhong Rui , Huang Lin Wei , Qu You Le
Published: January 2012

To meet the demand of food, pharmaceutical and cosmetics industry, study on the oligosaccharide- collagen peptide complexes has both scientific significance and application values. In the text, the preparation process and antioxidant capacity of oligochitosan-collagen peptides complexes were reported. The resultes indicated that the maximum DPPH radical-scavenging activity of oligochitosan-collagen peptide complexe was reached to 19.26 % when the ratio of oligochitosan to collagen peptide was 80:20, and the activity was stronger than the oligochitosan and collagen peptide at the same concentration in the detection range. In combination with the results of ion-exchange chromatography, we could concluded that the intermolecular chain associations were formed between oligochitosan chains and collagen peptide molecules driven by the electrostatic, intermolecular hydrogen bond and hydrophobic interactions. The results opened a new perspective on the utilization of oligochitosan-collagen peptide complexes as drug, food or cosmetic additives.
Numerical Simulation Research on the Crowned Design by Multiple-Variable-Curvature Arcs for Cylindrical Roller Bearing
Authors: Zhang Hong Wei , Chen Jia Qing
Published: January 2012

Based on finite element software MSC.Marc, the specific simulation model of cylindrical roller bearing was established, the axial equivalent stress distribution corresponding to Lundberg theoretical logarithmic crowned type was analyzed. Through the results of contact-mechanics properties and by means of design innovation, it is put forward that the Lundberg theoretical logarithmic crowned type can be replaced approximately by the multiple-variable-curvature arcs to avoid the stress concentration on the ends of roller. The influence of arc number on the axial equivalent and contact stress distribution was analyzed using finite element simulation. According to the numerical research, the appropriate number of curvature-changing arc segments was proposed. This method can be applicable to other types of line contact and the crown design of the roller
A De-Noising Method for Medical Ultrasonic Image Based on ROF Decomposition and Adaptive Wavelet Threshold
Authors: Zhou Xiong , Xia Yun Feng , Li Xiao
Published: January 2012

There are always lots of speckle noises in medical ultrasonic images because of the imaging mechanism of it. These speckle noises significantly reduce the clarity of the image and as a result, cause great difficulties in ultrasound diagnosis. To solve this problem, this paper presents a new de-noising method for medical ultrasonic image based on ROF model and adaptive wavelet threshold de-noising method. In addition to inhibiting the speckle noises in the medical ultrasonic image, this method can retain and even enhance the image detail information as much as possible.
Economic and Environmental Assessment of Straw Direct-Fired Power Generation
Authors: Hong Jing Min , Zhou Jing
Published: January 2012

A cost combined life cycle assessment was carried out to estimate the economic and environmental impact of corn straw direct-fired power generation. Results showed that the road transport, diesel, and infrastructure stages represented the dominant contribution to environmental impact in most midpoint categories, whereas the tax, depreciation, raw materials, and infrastructure price played an important role to economic impact. Improving raw material consumption efficiency and decreasing the direct emissions (i.e., nitrogen oxides and sulfur dioxide) generated from electricity production stage are the efficient way to minimize overall environmental or economic impacts.
Effects of Cooling Air Temperature and Cutting Velocity on Cryogenic Machining of 1Cr18Ni9Ti Alloy
Authors: Yuan Song Mei , Liu S. , Liu Wei Dong
Published: January 2012

This paper presents experimental investigations on influences of cooling air temperature, as well as cutting velocity, on performance in milling of the 1Cr18Ni9Ti alloy with coated cemented carbide inserts. Cutting force, tool wear and surface roughness are experimentally studied to compare the effects of different cooling air temperatures. The results showed that minimum quantity lubrication (MQL) with cooling air significantly reduces cutting force, tool wear. Three different cooling air temperatures are used to investigate the effects of cooling air temperature on the machinability characteristics of 1Cr18Ni9Ti alloy. Based on the experimental results, MQL with cooling air of −50°C provides more favorable effects compared to the other two cooling air temperatures (−10°C, −30°C). However, different cooling air temperatures have a slight effect on cutting force under the same MQL condition.
Research on Influence of Contact Stress on the Hinge Moment Balance Measures
Authors: Xu Yue , Qiu Jun Wen
Published: January 2012

This paper using the method of combining balance static calibration with finite element analysis research the change and distribution law, and analyze the influence of the law on primary coefficient of hinge moment balance measurement, in conditions of different fixed-end geometry size and different preloaded force of fastening bolt.
Research on Finite Element Simulation Processing Method for Flatness Prediction
Authors: Sui Xiu Lin , Zhang Chun Hong , Zhao Ping , Hu Na , Zhang Ping
Published: January 2012

The prediction of flatness is researched based on the simulation of virtual NC manufacture process. In this paper, a new interpolation-regression model is proposed, which is based on the simulation method of the finite element analysis and depends on MATLAB to realize the calculated algorithm of flatness error. In the model, on the premise of that the workpiece is completed the simulation, the information of numerous discrete points is acquired from the virtual workpiece. A new surface which is much closer to the workpiece morphology is generated by interpolation theory with statistics toolbox of MATLAB. The assessed datum of flatness is concluded by the theory of the multivariate linear regression. Synthesizing the original points and the created datum, the work calculates the flatness error and develops the flatness predicted system of virtual workpiece. The system can realize the vivid man-computer interaction in MATLAB.
Synthesis and Characterization of ZnS: Fe/ZnS Core-Shell Nanocrystals
Authors: Li Li Hua , Gu Yong Jun , Xie Rui Shi , Zhu Jian Guo
Published: January 2012

ZnS:Fe and ZnS:Fe/ZnS core-shell nanocrystals were synthesized by chemical precipitation method. It was found that the ZnS: Fe based nanocrystals possess zinc blende structure. Compared to ZnS: Fe nanocrystals, the intensity of the X-ray diffraction peaks of ZnS: Fe/ZnS nanocrystals reduced and these peaks moved to lower angles. TEM images show that ZnS: Fe based nanocrystals are spheroidal and the average particles size is about 3~4 nm. PL spectra of ZnS: Fe nanocrystals revealed several mission bands, ~406nm, ~444nm, ~416nm, However, PL spectra of ZnS: Fe/ZnS nanocrystals showed several mission bands, ~420nm, ~432nm, ~449nm.
Displacement Control of Hydraulic Pump with Servo System for Energy Saving
Authors: Song Jin Сhun , Ren Guan Gan , Ren Yu Jie , Zhang Bai Sen
Published: January 2012

The worst problem we are facing in the hydraulic system is the serious loss of energy, due to bad matching between the power components and the actuators and the large pressure loss when oil flowing though the various hydraulic elements, especially in speed governing system. However, Servo pump which is introduced in this paper can cover the problems mentioned above finely. The most difficult thing is its mathematical modeling, in the paper, it is established according to the actual situation. Here, the modeling between servo valve and cylinder, between cylinder and pump are established respectively, then these are connected by geometry relationship, finally ,the whole modeling is completed.
Analysis of a Comprehensive Example of Numerical Control Machining
Authors: Wan Jin Gui , Wang Xi Ping , Gao Qi , Zhang Fei
Published: January 2012

This paper attempts to analyze a comprehensive example of innovative design and NC machining. In this example, the designed works consists of three mechanical parts, which are designed in UG system. By the advanced CAM technology of UG, automatic programming is completed. But some NC programs are from manual programming. NC machining technology is used to process the works. The example involves integrated application of 3D modeling, NC processes and programming, and machining technology. The paper focuses on the processing method of the parts, in which the technical difficulties are analyzed and summarized. It can provide valuable reference for the research of NC machining technology.
Small-Sized Wind-Light Complementary Power Generation System with Permanent Magnetic Levitation Technique
Authors: Zhang Gang , Jiang De De , Zhang Jian , Zhang Xue , Li Ming Yan
Published: January 2012

In this paper, permanent magnetic levitation technique is studied in the research of small-sized wind-light complementary power generation system. Radial and axial permanent magnetic levitation technology has been studied, and the over design is done based on these two kinds of technologies, which make the wind power generation get breeze starting. It lays a solid foundation to achieve the breeze power generation. The overall design of the important parts of the power generation system has also been put forward in this paper.
Study on Support Properties of Axial Maglev Blood Pump
Authors: Wu Hua Chun , Wang Zi Yan , Hu Ye Fa
Published: January 2012

Artificial heart pump requires small structure, low energy consumption and certain stiffness and damping for transplanting and long time using. This paper thus designed a hybrid-type axial maglev blood pump, which not only has small size, almost no energy, and poor dynamic characteristics of permanent magnet bearing but also has low power consumption, long life and good dynamic characteristics of magnetic bearing. Based on finite element method, magnetic flux of axial magnetic bearing, radial magnetic bearing and test rig are analyzed; at the same time, the structure parameters and mechanical properties and the coupling of radial MB and axial MB are studied. The results show that: rotor displacement of axial bearing and radial bearing will affect load capacity and stiffness. The conclusions provide a scientific basis for design and optimization of blood pump
Kinematics Simulation on the Centre of Sliding Universal Joints
Authors: Chang De Gong , Wang C.C. , Zuo B.
Published: January 2012

This paper based on the improved twin tripod sliding universal joint and let it has the determined movement output. And create the three-dimensional model of twin tripod sliding universal joint before and after improved in software pro/e, and then put it into the simulation module, carry out the kinematic simulation of the tripod center on coupling. Obtained the curves of displacement, velocity and acceleration for two kinds of tripod centers.
Study of the LQR Controller for Magnetic Flywheel Rotor System
Authors: Wen Xiang Long , Song Chun Sheng , Cao Cao , Ding Guo Ping
Published: January 2012

Gyroscopic effects in the flywheel rotor greatly influence rotor stability especially at high speed. When the pole-zero position moves to right of s-plane, the damping of the pole is getting smaller, and the stability of system is getting worse with the increasing of rotor speed when the decentralized PD control law is used only. The LQR (linear quadratic regulator) control method is used to reduce gyroscopic effect and forced vibration. The simulation results show that LQR controller have a good performance on the reduction of gyroscopic effect and vibration of magnetic flywheel rotor system.
Study on Evaluation Index System of Product Quality Competence Based on Manufacturing Industry
Authors: Li Wei Hong
Published: January 2012

From a new perspective, this paper explores the possibilities of constructing an index system of evaluating product quality competence for the manufacturing industry based on the analysis of the formation of the product quality in the manufacturing industry. Through utilizing the analytical instrument of linear matrix composite, the paper has conducted an empirical study based on a machinery manufacturing enterprise located in Changzhou City.
Decoupling Control for Bearingless Synchronous Reluctance Motor Based on Neural Networks Inverse
Authors: Yang Ze Bin , Zhu Huang Qiu , Sun Xiao Dong , Zhang Tao
Published: January 2012

A novel decoupling control method based on neural networks inverse system is presented in this paper for a bearingless synchronous reluctance motor (BSRM) possessing the characteristics of multi-input-multi-output, nonlinearity, and strong coupling. The dynamic mathematical models are built, which are verified to be invertible. A controller based on neural network inverse is designed, which decouples the original nonlinear system to two linear position subsystems and an angular velocity subsystem. Furthermore, the linear control theory is applied to closed-loop synthesis to meet the desired performance. Simulation and experiment results show that the presented neural networks inverse control strategy can realize the dynamic decoupling of BSRM, and that the control system has fine dynamic and static performance.
Influence of Magnetic Bearing Stiffness on Rotor in Wind Turbine Generator
Authors: Wang Nian Xian , Zhang Jin Guang , Ding Guo Ping
Published: January 2012

Magnetic suspended wind turbine generator is widely studied due to its low loss, low maintenance cost and high reliability. However, affected by the small stiffness of magnetic bearing, the generator shaft supported by magnetic bearing will be eccentric. Therefore, the performance of generator will be affected. A horizontal axial magnetic suspended wind turbine generator is designed in this paper. The variations of shaft eccentricity and Maxwell force of rotor supported by different bearing stiffness are studied. The results show that the shaft eccentricity affects the performance of generator; and the bearing stiffness is the key to reduce those effects. The magnetic bearing designed in this paper can meet the requirements of generator.
Strain Gradient Plasticity Applied to Material Cutting
Authors: Royer Raphaël , Cahuc Olivier , Gerard Alain
Published: January 2012

To better understand the complex phenomena involved in the cutting process is to better qualify the behaviour law used in the simulatiotrn of machining processes (analytical and finite element modeling). The aim of this paper is to present the choices made regarding the behaviour law in this context, indeed, commonly used behaviour laws such as Jonhson-Cook can bring unsatisfactory results especially for high strain and large deformation processes. This study develops a large deformation strain-gradient theoretical framework with hypothesis linked with to metal cutting processes. The emphasis of the theory is placed on the existence of high shear phenomena creating a texture in the primary shear band. To account for the texture, the plastic spin is supposed to be relevant in this theory. It is shown that the theory as the capability of interpreting the complex phenomena found in machining and more particularly in high speed machining.
Mode I Interlaminar Fracture Toughness of Through-Thickness Reinforced Laminated Structures
Authors: Tarfaoui M. , Hamitouche L.
Published: January 2012

The main objective of the study is to understand the mechanisms of the preform reinforcement (2D, stitched and 2.5D) in laminated composite materials. The study is focusing on the mode I interlaminar fracture toughness for glass/vinylester based composites. Starting from DCB tests we quantify the critical energy release rate for the various cases of reinforcement, conclusive that 2.5D reinforcement can increase resistance x7 in comparison with the standard composite. Moreover, the existence of z-fibres made the fracture more complex and caused several characteristic phenomena, so that the required fracture energy for crack propagation was strongly increased. It is shown that a finite element model is successful in reproducing qualitatively the cracking initiation and propagation through the un-reinforced and 3D reinforced sample provided that the action of the through-thickness reinforcement is modelled by discrete nodal forces so as to replicate the physical phenomena.
Orthotropic Model Plate under Shear-Bending
Authors: Karama Moussa
Published: January 2012

The aim of this paper is to analyse the behaviour of various shear deformation laminated plate theories previously proposed by Reissner [1] , Reddy [2] and Touratier [3]. The accuracy of those theories is compared on two problems laminates for which an analytical solution has been given by Timoshenko for isotropic and Lekhniski for anisotropic plate. Retaining the best model among those compared, interlaminar continuity conditions have been taken into account in this best response for laminates and show how important these interlaminar conditions are to improve accuracy by comparison with the finite element solution. Models which have been introduced are two-dimensional ones and imply the three standard generalized displacements associated with shear-bending. Studies limited to symmetric and orthotropic plates. Finally, an analysis of edge effects has been conducted for a circular symmetric orthotropic clamped plate. Edge effects have been observed with refined shear deformation theories but not with the first-order shear deformation theory due to Reissner.
Numerical Model to Simulate the Drop Test of Printed Circuit Board (PCB)
Authors: Assif S. , Agouzoul M. , El Hami A. , Bendaou O. , Gbati Y.
Published: January 2012

Increasing demand for smaller consumer electronic devices with multi-function capabilities has driven the packaging architectures trends for the finer-pitch interconnects, thus increasing chances of their failures. A simulation of the Board Level Drop-Test according to JEDEC (Joint Electron Device Council) is performed to evaluate the solder joint reliability under drop impact test. After good insights to the physics of the problem, the results of the numerical analysis on a simple Euler-Bernoulli beam were validated against analytical analysis. Since the simulation has to be performed on ANSYS Mechanical which is an implicit software, two methods were proposed, the acceleration-input and the displacement-input. The results are the same for both methods. Therefore, the simulation is carried on the real standard model construction of the board package level2. Then a new improved model is proposed to satisfy shape regular element and accuracy. All the models are validated to show excellent first level correlation on the dynamic responses of Printed Circuit Board, and second level correlation on solder joint stress. Then a static model useful for quick design analysis and optimization’s works is proposed and validated. Finally, plasticity behavior is introduced on the solder ball and a non-linear analysis is performed.
Reliability Based Design Optimisation of Hydroformed Welded Tubes
Authors: Mahfoudh Ayadi , Cherouat Abel , El Hami A. , Radi Bouchaib
Published: January 2012

This paper presents an experimental/numerical methodology which aims to improve 3D welded tube considering their anisotropic effect, geometrical singularities found in the welded joint, and heat affected zone behaviour by hydroforming process. This process contributes to reduce the number of welding and assembly operations needed to generate complex structures, while improving the weight saving and quality of finished parts. In spite of the advances in the performance of this manufacturing technology, some problems are linked to particularities of certain raw materials and additional studies must be developed, like in the case of welded tubes. The experimental study is dedicated to the identification of stress-strain flow of the base metal and the heat-affected zone from the global measure of tube displacement, thickness evolution and internal pressure expansion. Nanoindentation test is adapted to investigate the heat affected zone mechanical behaviour. Workpiece behaviour's models used to simulate the expansion tests, made it possible to highlight the combined effects of the inhomogeneous behaviour of basic material and heat affected zone, as well as the geometrical singularities found in the welded tubes. From the simulations carried out, it is clear the influence of the plastic flow behaviour of the welded tube in the final results (thickness distribution, stress instability, tube circularity, critical thinning and rupture).
Summary of Carbon Sequestration Methods
Authors: Zhang Qi , Huang Ying Li
Published: January 2012

With the signing of the ‘Kyoto Protocol’, more attention has been paid to the greenhouse effect because of the emission of CO2 of human activities. Therefore carbon sequestration accounting becomes more and more significant as the world starts to realize the significance of launching forestation activities for carbon sequestration. This research reviewed the two categories of methods in accounting forest carbon sequestration: Biomass Investigation methods and Microclimatology methods. Principles of the two methods will be introduced in the essay, followed by detailed analysis on both the advantages and disadvantages. Furthermore, the individual applicability will be discussed at the end of each method. Lastly, according to the characteristics of the Greater Khingan Mountains in Heilongjiang Province, the research selected the Stem Volume method as the method to account carbon sequestration of the Greater Khingan Mountains.
Research on Nonlinear Modeling and Simulation for Flexible Drive Train of Wind Turbine
Authors: Zhao Wen Hui , Duan Zhen Yun , Liu She
Published: January 2012

Wind energy has preferable economic and social benefits because of its cleanliness and free pollution, short construction period, and so on. The wind turbine is a complicated nonlinear uncertain system. So the modeling and analysis of system is crucial to the system design of wind turbines. Drive train performance of wind turbine was analyzed, and modeling methods were presented according to rigid drive train and flexible drive train. Based on those models, software has been designed to show the performance of the wind turbine, and then contrast with the result that simulated by GH Bladed software, to verify the accuracy of the models. The results show that the models can be used in optimum design and control strategy.
Photoelectrocatalytic Oxidation of Methyl Orange in KNO3 Solution
Authors: Song Ying Tao , Zhang Wen Jie
Published: January 2012

Photoelectrocatalytic oxidation of methyl orange on TiO2 films were investigated in KNO3 solution. In the potential range up to 1.2 V, electro-degradation rates were fairly low that was less than 1%. Degradation rates on the two films were larger at higher potentials. The film prepared without PEG showed better activities than the film prepared with PEG during the whole range of potential. Methyl orange degradation rate increased with increasing KNO3 concentration from 0 to 0.010 mol/l. After 120 min of irradiation, methyl orange degradation rate on the film with PEG was 89.5%, while degradation rate on the film without PEG was 92.0% after the same period.
Concrete Superplasticizer Prepared from Catalytic Oxidation of Lignosulfonate
Authors: Wang Zhe , Xue Jing Wen , Zhang Ji Shi , Liu Wen Xia
Published: January 2012

Bamboo lignosulfonate was modified under the role of H2O2 and catalyst in order to improve the dispersing property of lignosulfonate. Results show that the amount of H2O2 and pH value have strong influences on characteristics of lignosulfonate. Cement paste fluidity of lignosulfonate modified at pH5 and 11% H2O2 is 178mm, which is 68% higher than that of unmodified lignosulfonate. Both of oxidative degradation and condensation occur during catalytic oxidation reaction, but oxidation is the main reaction when high amount of H2O2 is applied. The structure of lignosulfonate has some relationship to water reducing property. High molecular weight, high carboxylic content and proper sulfonic group content are the main reasons that enhance water reducing property of lignosulfonate.
Description of Process Automation System for the Plate Mill Shearing Line
Authors: Cui Dong Yan , Xie Zai Xing
Published: January 2012

The Process Automation System for the plate mill shearing line was introduced in this paper. We mainly designed the hardware and software of the process automation system and described the detailed functions of this system. The advanced features of this system are producing superior results in mill world wide.
Research of a ZVZCS Full-Bridge PWM DC/DC Converter Based on Parallel Current-Mode Control
Authors: Liu Xing Qiao , Zhang Ying
Published: January 2012

The integration of digitization and soft-switch technology can improve the power control accuracy and reduce the volume of power, etc. The response of traditional DC/DC converter's control method was slow and the implementation of digitization was more complex. Therefore, this paper presents a zero-voltage zero-current (ZVZCS) full-bridge DC / DC converter digital control system which adopt parallel current-mode control method and advanced circuit topology combining with ARM processor. Finally, the results of simulation and experimental verify Simulation and the zero-voltage zero-current converter topology is reasonable, parameter design is correct, consistent with the expected theoretical analysis, digital control strategy is feasible.
Research on Reconstruction Algorithm of Temperature Field by Acoustic Measurement in Boiler
Authors: Lu Hong Bo , Sun Wei Hua , Li Zhi He
Published: January 2012

Based on the theory of acoustic measurement of gas temperature and the ideal temperature field distribution in boiler, a new algorithm for reconstructing temperature field taking into account the compensation of sound wave refraction is proposed. According to engineering software MATLAB, computer simulation of the reconstruction algorithm can be done, and the three dimensional display and the isothermal contour can be produced. Finally, the simulated temperature field is compared with the ideal one, and the error is analyzed. It is proved that the reconstruction algorithm is accurate and feasible.
A Review of Wind Energy Activities in China
Authors: Guo Zhi Ping , Li Qing An , Liu Qing Long , Wang Yan Fei
Published: January 2012

China is the largest developing country with the annual growth rate of 9.8% and the second largest energy consumption, greenhouse gas emissions and CO2 emissions in the world. Wind energy helps decreasing import dependency, diversifying sources of production, and contributes to a sustainable development in many countries. This article explores the importance of global wind turbine development in 2010. And then introduced the use of wind power annual development condition and the distribution characteristics of wind resources in China. Finally the existing problems were pointed out in the wind power industry of China, and have a guiding significance for the development of the future of China's wind power career.
Fluorescent Properties of Mg (II) Complex with 1-Acetyl-2-Naphthol-4, 4’-Diaminodiphenylmethane
Authors: Wang Li Hua
Published: January 2012

A mono-ligand neutral Mg (II) complex of a Schiff base ligand derived from 1-acetyl-2-naphthol and 4, 4’-diaminodiphenylmethane was prepared and characterized. The Schiff base acts as a double, negatively charged quadridentate ligand forming stable neutral Mg (II) complex. The luminescent characterizations of the Mg (II) complex material in solid and in organic solvents show that the Mg (II) complex has strong luminescent emission at ca. 452 nm when excited at 323 nm. The Mg (II) complex synthesized may be an excellent luminescent material.
Video Image Segmentation and Understanding
Authors: Zhang Shi Lin , Li He Ping , Zhang Shu Wu
Published: January 2012

Video object extraction is a critical task in multimedia analysis and editing. Normally, the user provides some hints of foreground and background, and then the target object is extracted from the video sequence. In this paper, we propose a object segmentation system that integrates a clustering model with Markov random field-based contour tracking and graph-cut image segmentation. The contour tracking propagates the shape of the target object, whereas the graph-cut refines the shape and improves the accuracy of video segmentation. Experimental results show that our segmentation system is efficient
Application Research of Information Technology in Vehicle
Authors: Fu Yu , Li Feng , Zeng Rui Li , Xiao Yun Kui , Zhang Ling Ling
Published: January 2012

With the increasing application of information technology in the manufacture and design , vehicle performance has been improved constantly. The basic concept of vehicle information technology is first put forward, the significance of this research is analyzed, and a brief description of present domestic and international study condition is given. On the base of studies level at home , research contents of vehicle information technology is discussed and the application development tendency of vehicle information technology in vehicle is pointed out
Feature Extraction of Acoustic Emission Signals for Rotor Fault Based on Daubechies Wavelet Analysis
Authors: Yu Yang , Yang Ping , Yang Li Jian
Published: January 2012

The failure of rotating machine is often occurred by the rotor rubbing and the acoustic emission will be created by the rotor rubbing. The acoustic emission (AE) signal is the transient and non-stationary signal. Wavelet Transform has outstanding advantage revealing the character of this signal in time-frequency. With the increasing of the rotor speed, the noise increases a lot and the wavelet coefficients of AE signal change to high-scale. The db10 was applied in AE signal processing, and the modulus maxima method was applied to reconstruct of the signal. The result shows that the AE signal of rotor rubbing could be separated from noise by Daubechies Wavelet