bluuebunny/crossref_metadata_2025 huggingface dataset:
Une progressive rationalisationde l'encadrement des chômeurs
Authors: Divay Sophie
Published: September 2011

À partir de la fin des années 1970, des dispositifs d’aide à la recherche d’emploi se sont progressivement développés pa-rallèlement à la croissance du chômage. Une recherche me-née au milieu des années 1990, portant sur les productions écrites et les discours de spécialistes de la recherche d’emploi a permis de mettre au jour des univers notionnels centrés d’une part sur une dimension technique qui normalise les démarches des chômeurs et d’autre part sur une dimension comportementale recouvrant un modèle du « bon chercheur d’emploi ». La rationalisation du « métier de chercheur d’emploi » a été suivie, au début des années 2000, d’une seconde vague de rationalisation touchant cette fois davantage les conseillers eux-mêmes tant l’« activation » des chômeurs – c’est-à-dire l’injonction au « retour rapide en emploi durable » – est devenue prégnante dans les politiques de lutte contre le chômage. L’analyse du « jargon professionnel » des conseillers d’une agence privée de placement révèle à quel point la logique gestionnaire pèse désormais sur ces professionnels dont les résultats (taux de placement) représentent des données politiquement sensibles.
Public transport infrastructure, urban sprawl, and post-carbon cities
Authors: Bureau Dominique
Published: September 2011

Résumé La réduction des émissions de CO 2 liées aux transports dans les villes constitue un enjeu majeur pour la maîtrise du risque climatique. À cet égard les travaux pionniers de Newman et Kenworthy ont suggéré que certaines de ces émissions étaient évitables, celles-ci dépendant de la forme des villes, et de la place des transports individuels routiers dans leur fonctionnement. Mais les orientations à mettre en œuvre dans cette perspective, et leurs complémentarités éventuelles, entre politique des transports, politiques urbaines, et politiques climatiques, sont l’objet d’intenses débats entre les tenants de la priorité à l’amélioration de l’efficacité des véhicules, ceux des ruptures avec l’étalement urbain ou des comportements de mobilité, et les hérauts des transports alternatifs à l’automobile. En Europe, la ville durable est généralement conçue comme l’inversion du processus d’étalement urbain, associée à la constitution de premières couronnes denses, desservies par des réseaux lourds de transport en commun type Tramway. L’analyse menée ici apporte un élément en faveur de ce scénario, en signalant que ces infrastructures doivent être évaluées en prenant pleinement en compte le trafic induit dont elles bénéficieront, grâce à la densification générée à leur voisinage. Pour autant, ceci ne suffit pas à assurer que ce scénario constitue la structure optimale d’une ville durable, qui dépend de nombreux paramètres, et dont l’émergence réclame d’abord un cadre approprié de politiques publiques avec, au premier rang, l’instauration d’un prix unique carbone. Classification JEL : R48, R52.
Geographical Economics: A Historical Perspective
Authors: Thisse Jacques-François
Published: September 2011

Résumé Cet article présente un survol de l’histoire de la théorie économique spatiale. Il est organisé autour de trois thèmes et de trois auteurs : (1) l’utilisation du sol et l’économie urbaine (Thünen), (2) la nature de la concurrence dans une économie spatialisée (Hotelling) et (3) la nouvelle économie géographique et l’émergence des agglomérations économiques (Krugman). Classification JEL : B10, B20, B40, F20, L13, R12, R30.
The Application of Multi-Wedge Cross Wedge Rolling Forming Long Shaft Technology
Authors: Zhao Jing , Lu Li Qun
Published: September 2011

The process of multi-wedge cross wedge rolling is an advanced precision technology for forming long shaft parts such as automobile semi-axes. Three-dimensional solid model and the finite element model of semi-axes on automobile and dies of its cross wedge rolling were established. The process of cross wedge rolling was simulated according to the actual dimension of semi-axes on automobile utilizing the finite element method (FEM)software ANSYS/LS-DYNA. The required force parameters for designing semi-axes mill are determined. The appropriate roller width was determined according to the length and diameter of semi-axes on automobile. The results have provided the basis for the design of specific structure of automobile semi-axes cross wedge rolling mill.
Effect of Shape and Size of Polishing Pad on Material Removal Characteristic
Authors: Zheng Di , Yu Yong Jiang , Zhang Xian Hua , Zhao Xiao Jun , Wang Yuan , Shi Yong Jie , Lu Feng
Published: September 2011

The objective of this paper is to investigate the effect of shape and size of polishing pad on the material removal characteristics in the NC polishing. The material removal model was established based on Preston equation. The law of the effect of shape and size of polishing pad on the model was simulated. Experiments were carried out. Results showed that both of the shape and size of polishing pads influence the shape of material removal curves, polishing efficiency, and surface roughness. The amount of removed material increases with the increasing of size of polishing pad.
Wear Simulation for Edge Preparation Cutting Tools
Authors: Wang Hao , Yu Ai Bing , Dong Liang , Wu Lei
Published: September 2011

Edge preparation is a process to modify edge geometry and surface integrity of cutting tools. Edge preparation experiments of tungsten carbide cutting tools were carried out through an abrasive nylon brushing method. Tools wear and cutting temperatures with different edge radius were simulated with FEM software. The experimental results show that cutting edge defects were eliminated through brushing edge preparation. The edge radius has influences on cutting tool performance. When the edge radius is 20μm, the least wear can be obtained. Then tool wear value increases with the edge radius. A suitable edge radius will have a reasonable cutting temperature distribution. The tool temperature distribution shows the same results as tool wear. A suitable edge radius range is needed for edge preparation and a reasonable edge radius is needed to improve tool life.
Influence Analysis of Block Wedge on Rolled-Piece End Quality in Cross Wedge Rolling
Authors: Shu Xue Dao , Wei Xin Hong , Chen Le Ping
Published: September 2011

Rolled-piece end quality is one of key factors to decide material utilization ratio in cross wedge rolling (CWR). Good workpiece end quality can improve material utilization ratio effectively. In the paper, by adding the block wedge near the end of mould, it can block surface metal which flows faster in the axial direction and avoid the end concavity of rolled piece. The material loss will not be present and good end quality rolled piece will be produced. The results are significant for improving material utilization ratio and promoting applications of CWR.
Evaluation of Dynamic Property of Radiogram under Repetitive Drop Shock
Authors: Guo Yan Feng , Mao Yan Hong , Fu Yun Gang , Xu Wen Cai
Published: September 2011

Repetitive impact during highway and railway transportation has potential and severe harm for the product with fragile or damageable component. The radiogram belongs to a typical electronic product with panel and box structure, and occurs with the falling down of loudspeaker contacted on the top box, the failure of electronic components, and the fracture of outside box during transportation and storage. So the main feature of this article is the analysis on the natural vibration property, and the evaluation on the drop shock property including amplification factor and relevant curves under nine kinds of repetitive impact with different impact duration and drop height. The results show that the amplification factor markedly rise while the impact duration 2.02ms (nearly causing the resonance of radiogram), the repetitive drop shock may bring more serious damage than single impact load, so the case should be paid attention for the design of package cushioning.
Research on Mechanical Properties and Simulation of Straw-Biodegradable Tableware
Authors: Jing Quan Rong , Xu Feng , Gao De
Published: September 2011

Through the test of mechanical properties of the straw-biodegradable tableware, the relationship between performance and processing technology was analyzed and the optimal solution was obtained. And using finite element analysis software, the internal stress distribution under the specific load was obtained based on mechanical properties, more valuable reference method about tableware design was provided through studying the changing intensity.
Bus Swing Door Parameter Design Based on KBE
Authors: Zhou Ren He , Zuo Xiao Ming
Published: September 2011

The paper presents definition and the features of typical Knowledge Based Engineering (KBE) system. Based KBE system, a bus swing door parameter rapid design system’s theory and structure are discussed. Based on above analysis, a parameter rapid design system is constructed with its UI (User Interface). With this system, the efficiency that a designer designs a swing door can be improved fifty times.
The Meshless Method for Numerical Solution of Modified Equal Width Wave (MEW) Equation
Authors: Cheng Rong Jun , Ge Hong Xia
Published: September 2011

The reproducing kernel particle method (RKPM) is used in this paper to find the numerical solution of modified equal width wave (MEW) equation. A variational method is used to obtain the discrete equations, and the essential boundary conditions are enforced by the penalty method. The effectiveness of the RKPM for the modified equal width equation is investigated by two numerical examples in this paper.
Study on Box Girder Damage Identification of Cable-Stayed Bridges
Authors: Zhu Hua Wei , Wang Hong Mou , Peng Wei
Published: September 2011

A comparative study of the girder damage identification of Jintang Cable-stayed Bridge in Zhoushan Island-Land Project using the deflection index, the cable tension index, the beam bottom bending stress index, the modal curvature index and the modal flexibility matrix is introduced. By means of finite element method, a series of damage cases associated with the box girder are analyzed. The result shows that, for different damage types, the best effect of the girder damage identification is the modal curvature index, followed by the cable tension index, the beam bottom bending stress index is nearly of the same effect as the modal flexibility matrix index, and the worst is the deflection index.
Design of Embedded Control System on Greenhouse Environment Based on GSM and GPS
Authors: Wu Fei Qing , Yu En Jun , Liu Cai Xiang
Published: September 2011

At present, the environment control system is mainly used in large and modern greenhouses in China. It is hard to popularize among ordinary farmers because of some reasons such as inconvenient acquiring information, etc. In order to improve the existing problem, a wireless remote greenhouse environment monitor system was developed based on GSM and GPS. Thus the user can obtain real-time temperature and humidity of different greenhouses at any time by sending short messages to the control system so as to know the crop growth. The system, easier to move and operate, can be expanded according to practical need and is reliable and effective through field test.
Study on Commercial Application of Sustainable Design for Youth Product
Authors: Zhao Ying
Published: September 2011

With the enhancement of environmental protection consciousness, people pay increasingly attention to sustainable design all over the world recent years. Sustainable design is still in the early stage in China. Applying it in commercial operation is more helpful to promote sustainability in society. According to the survey, young people have strong environmental awareness relatively. There’re already many corporations have used sustainable idea in design for youth products successfully. This paper presents that sustainable design need to consider fully about the relationship among people, environment and economic. In accordance with the demands of youth to take different methods of sustainable design flexibly will benefit both to environment and human being.
A Novel MRF-Based Torque Servo Device
Authors: Zheng Di , Lu Feng , Hu Li Yong , Shi Yong Jie
Published: September 2011

In mechanical equipments or manufacturing processes, force control is definitely required to achieve desired performance or to ensure product quality. Aiming at this issue, this paper introduced an author-invented torque servo device that utilizes magnetorheological fluids (MRF) to provide a controllable torque. In the paper, the structure and working principle of the MRF-based torque servo device (MRT) were introduced, the constitutive model and the characteristics of the MRF were established and discussed. On the basis, the static and dynamic models of the MRT were both analytically and experimentally studied, and the control of the output torque of the MRT was demonstrated. As an example, the application of the MRT to the polishing of aspheric surfaces was presented in the end.
The Position Analysis of Spherical Seven-Bar Mechanism
Authors: Zhang Zhao Feng , Zhang Zhi Huan
Published: September 2011

In this paper, we turn plane seven-bar mechanism into spherical seven-bar mechanism, using quaternion to construct mathematical model for spherical seven-bar mechanism. Three constraint equations are obtained according to the angles constraint. Using Sylvester resultant elimination by two steps, a 32 degree univariate polynomial equation can be obtained. A numerical example confirms that analytical solutions of spherical seven-bar mechanism are 32 and with the help of Mathematic software to solve the location parameters.
A Simplified Interpolating Moving Least-Squares Method and its Error Estimates
Authors: Wang Ju Feng
Published: September 2011

A disadvantage of the MLS approximation is that the shape function of this method does not satisfy the property of Kronecker Delta function. Thus developing an interpolating MLS approximation is very important. In this paper, the interpolating moving least-squares (IMLS) method presented by Lancaster and Salkauskas is discussed in detail and a simplified expression of the approximation function of the IMLS method is given. The simpler expression makes it more convenient to use this method. The error estimate of the approximation function also is discussed. And a numerical example is given to confirm the results.
Kinematics Simulation of Vertical Flange Lathe with Double Machining Tools Based on Virtual Prototype Technology
Authors: Xu Hong Ping , Wu Ling Dong , Wang Yi , Li Liang Yi
Published: September 2011

To study the kinematic characteristics of a new designed flange vertical lathe with double machining tools, a virtual prototype model was developed in ADAMS with the help of PRO/E and MechPro, a seamless interface program between both mentioned software. And kinematic and dynamic simulations were carried out. The results of the simulations are consistent with the reality which states that the model was created correctly and the simulations were reliable.
Special Honing Machine for Cylinder Internal Hole
Authors: Cheng Guang Zhen , Chen Xu Qin
Published: September 2011

The special honing machine is used in the precision machine of the monomer hydraulic prop cylinder internal hole surface. The main revolving movement is driven by motor, the reciprocating linear motion is actuated by hydraulic ram. Honing machine consists of three parts, mechanism, the hydraulic system and the electric control system. The work principle and the processing process, the interlock relation between movements and the straight line feed motion velocity modulation method of this machine were discussed in this study. The special honing machine designed for the monomer hydraulic prop cylinder is convenient and easy for person to operate, and has high efficiency. The reciprocating linear motion driven by hydraulic ram is steady when direction is changed. It is convenient to change speed, and has advantageous of enhancement processing surface quality.
A New Method on the Position Analysis of 3-Dof 3-PC(RR)N Spherical Parallel Mechanism
Authors: Xu Dong Lai , Zhang Shuai , Si Jun Tao , Yu Wei
Published: September 2011

By applying quaternion and Sylvester resultant elimination method, and with the help of Mathematica 8.0 software, the 3-Dof 3-PC(RR)N spherical parallel mechanism location is analyzed. In solving inverse solution, there are 512-group input angle solutions, and 64-group real solutions. In the example of this paper, there are a total of 8-group real solutions by removing the extraneous roots.
Research of the Parametric Re-Development System Based on Pro/E
Authors: Wang Hai Qiao , Sun Bei Bei , Ge Xiao Lan , Qin Hong Yan , Han Xun Mei , Yu Cai Min
Published: September 2011

The Pro/Toolkit secondary development tools and Visual C++ programming language are used in the second development of the Pro/E, which can realize the parametric design of machine tool’s parts. Input the parameters, the system will automatically generate 3D models. This system can reduce the time of machine tool design and development, and improve the design efficiency. The information management module system can realize the management of machine tool important design parameters, which greatly lightened designers’ workload. This paper develops the parameterization design of supporting stand for the example, and introduces this development mentality and its key technologies in detail.
Routing Optimization of High-Level Order Picking Truck Based on Swarm Intelligent Algorithm
Authors: Wang Yi Qiang , Fu Chao , Ma Ming Yang , Wang Lin Bin
Published: September 2011

In order to improve the operation efficiency of order picking trucks in the warehouse, the mathematical model of the routing optimization problem is established. Then PSO (Particle Swarm Optimization) and ACO (Ant Colony Optimization) are used to solve the model. Experimental results show that both of them have good overall search ability and astringency. The operation efficiency is improved to a great extent by using swarm intelligent algorithms.
A Variable Speed Control Hydraulic System Based on BP Neural Network PID Controller
Authors: Huang Fang Ping , Peng Tian Hao
Published: September 2011

The variable speed hydraulic systems have many advantages, and research about this field in recent years has developed rapidly. In this paper, a variable speed hydraulic system is studied using BP Neural Network PID controller. The research results show that using BP Neural Network PID controller can achieve good control effect.
Semi-Online Machine Covering under a Grade of Service Provision
Authors: Wu Yong , Ji Min , Yang Qi Fan
Published: September 2011

Two semi-online scheduling problems on two parallel identical machines under a grade of service (GoS) provision were studied. The goal is to maximize the minimum machine load. For the semi-online version where the largest processing time of all jobs is known in advance, we show that no competitive algorithm exists. For the semi-online version where the optimal offline value is known in advance, we propose an optimal algorithm with competitive ratio 2.
Numerical Study of Low Gravity Effect on the Pressure-Sinkage Characteristics of Soft Soil
Authors: Zhou Gui Fen , Chen Guang Ming , Zhang Rui , Xu Shu Cai , Li Jian Qiao
Published: September 2011

The adhesion and the compressibility of the soft soil will vary as the earth gravity changes. In this study, the pressure-sinkage characteristics in low gravity conditions were investigated by three-dimensional Discrete Element Method (DEM). The data of the DEM parameters were obtained by analyzing the pressure-sinkage relationship embedded in laboratory testing data. The pressure-sinkage experiments of the sample soil in different gravities were simulated by using the software PFC3D. Using the Bekker formula, the values of pressure-sinkage parameters were obtained. The results show that, when the earth gravity changes from one sixth of the standard earth gravity to the standard earth gravity, the sinkage exponent increases lineally. The cohesive module of deformation increases along the conic trend. The low gravities have a sensitive affect on the data of the frictional module of deformation, and the data distribute beside a line. The change laws of the pressure-sinkage parameters provide instructions for the optimization design of vehicles working in low gravity field planet.
Elastic-Plastic Finite Element Analysis on Steel Pipe Rotary-Draw Bending Process
Authors: Huang Hua Gui , Liu Xiao Kai , Zhang Zhan Zhe
Published: September 2011

With non-linear elastic-plastic finite element method, the numerical simulation of the steel pipe rotary-drawing bending process is carried out, and the forming mechanism and spring-back phenomenon of rotary-draw bending is analyzed. Aiming at the phenomenon of pipe collapse deformation, a mandrel is used and it makes the bending process. The simulation results show that using mandrel could avoid collapse appearing in deformation area, reducing contact friction coefficient will help to improve wall thickness uniformity, and increasing the angle of rotary-draw bending will aggravate the amount of spring-back.
Study on Structure Simulation Analysis of Concrete Single Curvature Arch Dam
Authors: Xie Wei
Published: September 2011

Arch dam is a water retaining structure which has beautiful bodily form and reasonable structure form. In recent years, arch dam has been widely used. This paper adopts finite element method to carry out three-dimensional finite element simulation analysis for Xiuwen hydropower station, research variation law of the dam’s stress and displace in operational process. Research results show that, single curvature arch dam of Xiuwen hydropower station have reasonable structure, good mechanical properties, every index meets the requirements for design.
A Method of Image Texture Feature Analysis Based on Wavelet Decomposition
Authors: Zhong Li Jun , Li Wen Wen , Zhang Li Yun , Yu Ai Bing
Published: September 2011

A novel algorithm of analyzing the textural features of image is put forward for color difference classify of ceramic tiles. First the image of tile is pretreated. Then two level wavelet decompositions are used on the image, and the energy feature of each sub-graph is extracted. The energy contains color and textural features of image, which be used to classify tiles into different color. Tile under test is classified according to the similarity measurement, which is the similar distance between feature value of tiles under test and the one of standard tiles. Euclid distance is used as similarity algorithm. Experimental results show that this method can reflect spatial relationship of color more effectively, and improves the accuracy of the classification in the production line.
Research on Web-Based Reverse Engineering Service Center
Authors: Wang Chun Yu , Zhang Guang Wen
Published: September 2011

There are two necessary qualifications applying the skills of reverse engineering to develop a new product, including detecting device, and information processing and modeling technology. However, it is difficult for small and medium-size enterprises to have both. Therefore, in this research paper a web-based reverse engineering service center is proposed, which effectively connects the businesses using the reverse engineering services and the businesses offering these equipments and technologies to develop products. The services that the reverse engineering service center can apply as well as the relevant key technologies are introduced and illustrated. The approach has been proven as feasible.
Calculation of Dimension Chain through AUTOCAD Secondary Development Technique Based on Dimension Tracking Method
Authors: Ji Li , Liu Li Qun , Mei Xue Feng
Published: September 2011

Based on the principle of the dimension chain, this paper studies the dimension chain mathematical model and chooses a reasonable method for calculation of the dimension chain, establishing a model of the calculation of dimension chain margin of computer aided analysis and calculation. On AutoCAD platform, we developed the dimension chain calculation analysis software through secondary development by VBA, and applied the technology to dimension chain margin check. This significant saves the time spent in the process of manually calculating the dimension chain.
Output Feedback Control for Nonlinear 2-D Discrete Systems with Time-Varying State Delays
Authors: Bi Xiao Hua , Peng Dan
Published: September 2011

In this paper, we study stability analysis and stabilization problems for a class of nonlinear two-dimensional (2-D) discrete systems with time-varying state delays, described by local state-space (LSS) Fornasini-Marchesini (FM) second model. The upper and lower bounds of time-varying state delays are positive integers and the nonlinearity satisfies Lipschitz condition. First, a stability criteria is proposed through introducing a new Lyapunov function. Then a dynamic output feedback controller is designed to assure the stability of nonlinear 2-D time-varying systems. Moreover, the output feedback system matrices can be obtained by solving linear matrix inequalities (LMIs). Finally, a numerical example is given to demonstrate the effectiveness of our results.
Research on LED Based on the Adjusting and Combining of Modularization
Authors: Chen Li Na
Published: September 2011

Based on existing study on LED modularization, how to make flexible and convenient modular adjustments and combination on LEDs is studied in order to serve as requirements of LED’s functions and modeling. This research laid emphasis on the recombination of LEDs inside the module and the adjustments of modules. Combining with the theories of man-machine engineering, product system design, innovative design thinking and techniques in the product development, a set of systematic design procedures and methods on LED modular adjustments and combination were set up. With the application of research results, the author constructed a flexible and convenient LED lawn lamp which can make modular adjustments and combination.
Analysis of Transmission Ratio Problem for Planetary Gear Reducer with Two Internal Gear Pairs
Authors: Feng Xiao Ning
Published: September 2011

Planetary gear reducer with two internal gear pairs is known as NN type reducer. It has the advantage of large transmission ratio. Through the deep comprehensive studies on transmission ratio from four NN type reducers with different structure, the author proposes a new method to analyze transmission ratio from the tooth number difference for both internal gear pairs and external gear pairs, reveals rule, feature and range of transmission ratio of NN type reducer, and provides a clear train of thought for the selection of transmission ratio.
Application of Genetic BP Algorithm in Low Strain Test of Pile Integrity
Authors: Xiao Jing , Yu Ying , Hu Li Yong , Liu Shu Bo , Xu Meng Hua
Published: September 2011

This paper puts forward a neural network algorithm in pile integrity test on the basis of field data and the strengths of genetic algorithm and neural network algorithm. The result proves that it has faster convergence speed than simple BP algorithm, which can avert the artificial intervention during the data handling procedure and improve the reliability of the test result.
Research and Practice of a Talent Cultivation Scheme for Industrial Design
Authors: Lv Ci Xian , Ye Fei Fan
Published: September 2011

Currently both Science & Engineering students and Art students are recruited by the major of Industrial Design at colleges and universities. This paper attempts to analyze their differences and similarities in terms of the student sources, theory and practice teaching system and employment status by a three-phase research, including pre-training, in-training and post-training. Based on the research results, a talent cultivation scheme is proposed for training of creative, contemporary and practical industrial designers, whereby the major has to combine the technique education with the aesthetic education, so as to establish a scientific and complete system of both theory and practice training.
A Heuristics Based on RA for Two-Stage Flexible Flow Shop Scheduling with Head Group Constraint
Authors: Li Zhan Tao , Chen Qing Xin , Mao Ning
Published: September 2011

Rapid access (RA) is an effective heuristic method for solving the permutation flow shop problem with the objective of makespan. This paper proposes a heuristic IRA (i.e., improved RA) for the two-stage flexible flow shop scheduling problem with head group constraint. In the heuristic IRA, two dispatch rules, i.e., earliest completion time first (ECT)) and earliest start time first (EST), are proposed for allocating devices for tasks. Benchmark testing results show that using ECT dispatch rule can significantly improve the performance of heuristic IRA. As comparison, the heuristic CDS and heuristic Palmer have also simulated under the same conditions, and the results show that the IRA is able to provide much better performance.
Partner Selection in ASP-Based Automobile Panel Die Dynamic Alliance
Authors: Zong Xian Liang , Zheng Hui , Sun Yu
Published: September 2011

Application service provider (ASP) based dynamic alliance has great advantages in die industry. This paper presents a complete scheme for establishing an ASP-based dynamic alliance for automobile panel die industry. The proposed scheme divides the job of partner selection into three phases, i.e., discovery of potential partners, junior evaluation and selection of potential partners and combination optimization of dynamic alliance. Methods for the three phases of partner selection are proposed and discussed. A prototype system has been developed to confirm the proposed scheme’s feasibility and efficiency.
Optical Measurement with Synchronous Calibration Standard in Air-Pipe Height Control System and its Optimization
Authors: Cui Zhi , Ge You Hua , Lu Qian
Published: September 2011

Photogrammetric was widely used in engineering applications. But in a moving scene the standards’ position kept changed and accuracy of measurement would wave synchronously. To get a stable and precise optical measure system, a method using synchronously moving light standard with the camera was presented in this paper. The paper described the principle of measurement, the recognition algorithm and the height calculation. To meet the Real-time requirement a pre-computer method was used to optimize the calculation and to shorten the consume time. Experiments results show that the method has high accuracy and rapid detection speed to guarantee a constant clearance between the air pipe and uneven ground around railway.
Research on the Movement of the Guiding Roll in the Ring Rolling Process
Authors: Shu Xue Dao , Xiao Min
Published: September 2011

The guiding roll is an important part of the ring rolling equipment which plays an important part in stabilizing the rolling and ensuring the quality of product. This paper obtained the formula for instant diameter of ring during the rolling process and established the motion equation of guiding roll. The angular velocity, instant displacements in X and Y direction of guiding roll center were calculated by MATLAB software. The numerical simulation of ring rolling of ring with rectangular cross sections was completed under the ABAQUS/Explicit environment after importing the instant displacement of guiding roll center. The simulation results indicate that the guiding roll could be controlled accurately by the proper method. These research conclusions can provide scientific basis for ensuring the quality of product and accurately controlling the movement of guiding roll during the ring rolling.
Laser Local Stripe Bionic Strengthening of Mould Surface
Authors: Liu Li Jun , Chen Li Qiong , Jia Zhi Xin , Li Ji Qiang , Li Xian Yi , Zhou Hong
Published: September 2011

In order to solve the problems of the waste of resources, and reduce the cost directly caused by the short life of the hot die in enterprises, this paper analyzes the wear of hot die which is one of the main factors affecting service life, and a thought that enhanced mold through laser surface local stripe grid bionic process is pointed out. Different from traditional laser hardening technology, the service life of mold processed by bionic laser melting enhancement simulating butterfly wings is nearly doubled. Experimental results provide a new way to improve die life, and the application of laser local stripe grid bionic process will bring enterprises significant economic benefits for its extension in mould industry.
Detection of Laser Melting Bionic Stripe Quality on Mould Surface Based on Acoustic Signal
Authors: Liu Li Jun , Di Tie Nan , Jia Zhi Xin , Li Ji Qiang , Wang Yi Qiang , Zhou Hong , Li Xian Yi , Chen Li Qiong
Published: September 2011

In order to rescue the problems of controlling laser bionic strengthening local stripe of mould surface quality, it is put forward thoughts about the laser bionic local melting stripe of mould surface quality detection based on acoustic signal. Analyzed with the relationship between defocusing distance and acoustic signal characteristic, laser bionic strengthening local stripe quality, the results show that acoustic signal is weakened with the increased absolute value of defocusing distance. As the defocusing distance is 0mm, the role of the laser is primarily ablation and the stripe quality is the worst; the function of laser on the surface materials is too weak to strengthen when the defocusing distance is -4mm; laser on target surface plays its role of strengthening, mainly owing to melting, with defocusing distance of +4mm. Overall tests show that, based on the quantitative detection of acoustic signal characteristic, it could inspect and control the quality of strengthening stripe, and it will realize the overall control of laser bionic strengthening mould surface quality with guiding significance.
Measurement on Temperature Distribution of Metal Powder Stream in Laser Fabricating
Authors: Lei Jian Bo , Wang Zhen , Wang Yun Shan
Published: September 2011

In order to study temperature distribution of metal powder stream in laser fabricating, its thermal radiation in visible region was detected by CCD. Based on Planck’s radiation law, the relation between molten powder temperature and its visible thermal radiation could be set up. The thermal radiation image signal of powder stream was transformed to digital signal which was used to analyzing its temperature distribution. It was shown that crosswise dimension of molten powder was about 2.5mm in diameter at the distance of 5mm from power nozzle. The powder out from powder nozzle was heated rapidly by laser. Temperature of powder in central axis regions was the highest which was nearly 2000K at the power of 1100w. The temperature gradient of powder at the edge of laser stream was greatly. The measurement results could be used to optimize the design of powder nozzle and processing parameters of laser fabricating.
Auto-Multi-View Stereoscopic Technology
Authors: Liang Fa Yun , Niu Jin Xia , Wang Jing , Cheng Jie , Tie Zhi Cheng , Liang Fa Zhou , Zhang Hua , Liu Xiao Ping , Chen Hai Chu
Published: September 2011

The auto-multi-view technology enables us to perceive multi-angle stereo vision. The image resolution reduced lowly because of multi-partition. A two-partition method is promoted in this paper, detecting the eyes’ position by CCD sensor and comparing with individual view-area boundary , then adjusting the stereo image on the sub-screen. So, the method can improve the resolution of stereo image greatly by dividing the screen into two sub-screens no matter how many viewpoints.
Functional Watermarking Algorithm Based on Contourlet Transform and ECC
Authors: Peng Yu Lou , He Yi Gang , Lin Bin
Published: September 2011

User-defined functional watermarking algorithm was presented based on contourlet transform field and Ellipse Curve Cryptography（ECC） spatial field. First the edge and direction information of image was obtained by contourlet transform, the discrete functional watermarking was embedded into high frequency parts, and the embedding data was avoided to the image edge. ECC encrypts embedding coordinate’s series. Watermarking changes little original image because of less function data, and attends to zero watermarking algorithms. The results show that the algorithm is invisible to watermarking and also has enough robustness to noise and cropping attack.
Investigation on the Transmission Efficiency of the Planetary Gear Train
Authors: Chen Li Feng , Wu Xiao Ling , Qin Da Tong , Wen Ze Jun
Published: September 2011

A model for the transmission efficiency of the planetary gear train has been proposed based on the principle of energy. The network topology for the planetary gear train is established with the graph theory by substitution the net nodes for the parts. According to the principle of conservation of energy, the interaction model of the energy transfer of the gear train is built by the way of integration the energy transfer equations between the nodes. With the investigation on the power losses, the transmission efficiency of planetary gear train can be calculated.
Study on a Moisture Measurement Method Based on Microwave Attenuation
Authors: Li Ze Lun , Huang Zhi Cheng , Huang You Jun
Published: September 2011

A moisture measurement method based on microwave attenuation has been proposed. The principles of the method were analyzed theoretically and the structure of the moisture measurement instrument was designed. The microwave source, the isolator, the adjustable attenuator, the receiving antenna, the temperature sensor and the single chip microcomputer (SCM) system are all selected and designed. It can be concluded that the moisture measurement instrument with microwave attenuation method can be used in the online measurement system with high speed.
A Multi-Scale Self-Correction Method for Leaking Current of Insulator in Electric Transmission Line
Authors: Hong Xiao Bin , Liu Gui Xiong , Xu Jian Long , Wu Si Dong
Published: September 2011

The insulators leakage current in transmission line can be used to characterize the filth degree of insulator surface and its accurate measurement is very important. An on-line monitor platform for insulators leakage current is introduced. Then a new multiscale self-correcting method for insulators leakage current is put forward. In this method, the leakage current information is decomposed based on multilayer and multiscale theory to gain each scale detailed signal and smooth the information in the coarsest scale at first. Furthermore, each scale detailed signal is decomposed once again and processed at different thresholds. Afterwards, the signal is reconstructed. The reconstructed detailed signal and the coarsest scale smoothed information are filtered using Kalman filter. In the end, the optimal detailed signal and the smoothed detailed signal are reconstructed and the signal is optimally estimated in the finest scale. Finally, the method was been applied to safety monitoring for a real transmission line. The results show that, compared with traditional Kalman filter method, the precision of new method raises 27%. This method has the characteristics of strong denoising ability and good robustness. It can be applied to the similar complex situation.
Ontology Construction of Size Limitation in New Generation of GPS
Authors: Ji Liu Jing , Zhong Yan Ru , Meng Hao , Xia Xue
Published: September 2011

In order to facilitate the information passing during the entire life cycle of products, ontology technology is introduced into the new generation of GPS. Ontology of size limits of the new generation of GPS is constructed by Protégé in this paper. This paper extracts main concepts of tolerance, fundamental and limit deviations and defines the correlations between the concepts. Protégé is used to establish treelike hierarchical structure and correlation of the concepts which are handled as classes in ontology. Some individuals are added to facilitate the reasoning and using of the ontology. SWRL rules are defined to reason and query relevant tolerance and deviation values. A query case of size φ25H7 which gives nominal size, fundamental deviation symbol and tolerance grade shows that the size limits ontology achieves the query of size limits values with given conditions.
Permanent Magnet Linear Synchronous Motor Servo System Based on DSP
Authors: Hao Dong Qing , Zhu Lian Qing , Pan Zhi Kang , Guo Yang Kuan , Chen Qing Shan
Published: September 2011

Linear motor has a lot of merits, such as simple structure, fast dynamic response, high localization accuracy and great speed capability. It improves the dynamic sensitivity, accuracy and reliability of modern machining. On the basis of analyzing structure trait and operational principle of linear motor, a position servo control system of linear motor based on DSP is designed. This system is constructed according to vector control model. It consists of a control module, a detection module, a power driver module and a communication module. Closed-loop control strategies based on position feedback, speed feedback and current feedback are adopted. The Space Vector Pulse Width Modulation (SVPWM) integrates an inverter and a motor into a whole, which can make the full digital real-time controlling of PMLSM. TMS320LF2812 is selected as the controller in this control system, which can process the feedback signal of the detection module and output motor-droved current signals. The position and speed detection of linear motor is realized by a QEP circuit with a grating bar. Application of intelligent power module (IPM) simplifies the rectifier circuit and protects the circuit. The communication module is used to make connection between the servo system and a PC. The experimental results show that the servo control system proposed in this paper has reliable structure, good control performance, and simplicity in operation.
Control and Optimization of Negative Pressure in Scrap Copper Smelting
Authors: Li Ying Dao , Zhong Wei Hong , Guan Hong Wei , Ma Xiu Shui
Published: September 2011

Negative pressure is the main control variable in scrap copper smelting process, the control of negative pressure is not only closely related with producing safely, but also produces a direct impact on the quality of the anode plate, it is also a key breakthrough in energy saving. This paper first analyses the characteristics of negative pressure control in scrap copper smelting process, aims to larger overshoot and longer regulation under conventional PID control method, and then utilizes fuzzy control to correct the PID parameters online, to achieve the optimization control of negative pressure. Simulation result shows that the adjustment process of optimized control of negative pressure is steady and rapid, usually no or slightly overshoot, and the settling time is also reduced significantly.
Acoustic Emission Monitoring Technology Used in the Ceramics Grinding Cut Depth Control
Authors: Wang Min , Zan Tao , Hu Lei , Hu Jian Zhong , Zhang Xin Yun
Published: September 2011

Precision grinding on brittle materials accomplished without generating subsurface fracture damage is called ductile-regime grinding. The most important key point for maintaining a ductile material removal regime is to ensure that the cut depth made by grinding process does not exceed the critical cut depth. Through collecting and processing the acoustic emission(AE) signals generated by zirconia (PSZ) ceramic grinding tests, and analyzed the characteristics of AE signals under different grinding parameters. As a result of the experiments described in this paper, it can be concluded that AE signals measured during micro-grinding are sensitive to the changes of cut d- epths. The relationship between AE signals and material removal regime could lead to an in-process sensing strategy of the cut depths for ensuring grinding processes under ductile regime.
Research and Development of Electric Control System of Friction Coefficient Test Vehicle for Airport Runway
Authors: Zhou Chang Hong , Zhang Wei Yu , Wei Yong
Published: September 2011

This paper introduces a friction coefficient test vehicle for airport runway, which consists of the hydraulic system, mechanical system and electric control system. The electric control system uses the host computer - the slave computer joint control way and is the main control unit of the test system. It can implement data acquisition and transmission and control the action of mechanical and hydraulic systems so as to complete the friction coefficient measurements. The host computer is an industrial personal computer and the slave computer is a PLC. The hardware system has the strong control and anti-interference ability. In addition, the software filter is used so as to improve the accuracy of the data. The experimental results show that the friction coefficient test vehicle has reliable performance, high precision and good reproducibility, so it can complete automatically the continuous measurement of airport runway friction coefficient.
Theoretical Analysis of Magnetic-Electric Prospecting Method for Piping and Seepage Detection of Dyke
Authors: Fu Guo Hong , Yang Tian Chun
Published: September 2011

On the basis of presenting the piping and seepage detection by magnetic-electric prospecting method, the authors analyzed and testified validity of the method. According to calculated results, the magnitude of magnetic field of artificial current was smaller on section if electrodes and cables were set rationally. Usually, the magnetic field magnitude of piping had several times to more than decuple comparing with magnetic field of artificial current. So, the magnetic abnormity could be detected easily by high-precision magnetometers. At the same time, their curves’ characteristics were different evidently. The analysis result shows that the piping and seepage of dyke can be detected by combining method of direct current supplying and high-precision magnetic survey.
A Method for 3D Sphere Detection Using one-Dimensional Histogram and Polytope Method
Authors: Nakashima Shota , Nakamoto Hiroyuki , Kitazono Yuhki , Zhang Li Feng , Seiichi Serikawa
Published: September 2011

We propose a new method for a detection of a 3D sphere. This method uses polytope method, a kind of minimization algorithm. One-dimensional histogram is used to detect a 3D sphere. The histogram has two characteristics. (1) The distribution of the histogram changes if the parameters of representing the 3D sphere changes. (2) The value of highest frequency of histogram becomes maximum if the best parameters are obtained. Therefore, the maximum value of highest frequency of histogram is searched to obtain the best parameters of a 3D sphere by using polytope method. By using polytope method, proposed method can detect a 3D sphere from 3D vertex data including other shapes without a large memory space and a lot of processing time.
Novel Method for Extracting Body Boundary from Measured Point Cloud of Helical Surface
Authors: Guo Yang Kuan , Pan Zhi Kang , Meng Hao , Zhu Lian Qing , Wang Pan Yi
Published: September 2011

A fast efficient method for extracting body boundary from helical surface is proposed in this paper in order to build the model of the measured surface. Firstly, according to the density of the point cloud, a divisional cylinder is built from an established model of the helical surface. Secondly, a center of the circle is get from the XY projection of the point cloud by the least-square method, and the points are sorted to make the point cloud in sequence. Then a vector method is used to test the remaining point cloud, which is separated by the divisional cylinder to obtain the rough body boundary points. The rough boundary is modified by the angles between the points to obtain the accurate body boundary points. Finally, a smooth boundary is formed through the B-spline method. The expereimental results show that the proposed method does not need grid partition and boundary grid detection and the efficiency is very high.