bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Time Series Analysis in the Analysis and Forecasting of Track Geometry Status
Authors: Jia Chao Long , Xu Wei Xiang , Wang Han Ning
Published: December 2010

Track geometry deformation lead to dangerous of train driving, endangering railway transport. It is the prerequisite of developing a reasonable plan of track maintenance and repair that find out the occurrence of track geometry deformation and the law of development. It is also one of the core works of railway's maintenance and repair. In this paper, we analyze detect data of railway track use time series analysis, discovery the track deformation production, make a thorough inquiry to find out the trend of deformation occurrence and forecast the status of the track geometry. The results show that there is higher accuracy of the forecasting, and it can be used to guide the conservation of railway track.
LabVIEW over BACnet, a New Approach for Electromechanical Equipment Remote Monitoring System
Authors: Ren Ping
Published: December 2010

BACnet is a standard data communication protocol designed specifically for building automation and control systems. In BACnet network, each device is modeled as a collection of network-accessible, data structure called “objects”. LabVIEW is a graphical development environment for creating flexible data acquisition, device control and industrial automation applications at minimal cost. In this study, a remote monitoring system based on LabVIEW and BACnet was proposed, in which electromechanical equipment is described by a series of BACnet objects and LabVIEW provides a friendly unified human-computer interface for users. In order to evaluate the feasibility of this system, an experimental model was developed. Due to the characteristic of device-independent, not only can extend the scope of BACnet application, but also make different equipments monitored under the same platform becomes possible.
Optimal Parameters and Characteristics of Shunted Piezoelectric System with Negative Capacitance in Series
Authors: Zhang Wen Qun , Wu Xin Yue , Cao Wen
Published: December 2010

Piezoelectric system shunted with proper negative capacitance in series has low dynamic stiffness. According to frequency characteristic equations of the piezoelectric system, optimal parameters and characteristics of both shunted series structures were deduced and compared theoretically. One is negative-capacitance and resistance in series, and the other is negative-capacitance, resistance and inductance in seires. It presented that high damping characteristic can be obtained at low frequencies when shunted with series negative-capacitance. If proper inductance is included in shunt circuit, effective bandwidth could be extended and the peak of amplitude of response is decreased, what’ more, the stability of this structure is enhanced. This technology can be used in vibration isolators or sensors and the shunt structure including inductance is recommended.
Research on Contact Deformation Experiments in Stiffness Measurement of Spring Tubes
Authors: Li Yun Feng , Ma Zheng Hua , Wang Guang Lin
Published: December 2010

Contact deformation experiments in stiffness measurement of spring tubes are studied in this paper. Firstly, Herzian catact theory, Person method and one numerical method are proposed to solve the contact problem based on the character of the contact in spring tube stiffness measurement. Secondly, the normalized pressure profiles and the relationship between non-dimensionalized contact pressure and contact angle are taken to study three contact theories. Lastly, it’s proved by some error compensation experiments that Persson method and the Numerical method are more conformable to solve closely conformal problem.
Research of Nonlinear PID Control Method for Time Delay Systems
Authors: Liu Wen Bo , Wang Meng Xiao
Published: December 2010

A nonlinear PID control method based on Smith predictor is presented in this paper to control the time delay systems. This method combines the Smith predictor with nonlinear controller. And the simulation study had been done for a first-order time-delay system. The results show that this method offer good static and dynamic characteristics, at the same time its disturbance-rejection and robustness are better.
Image Segmentation Method for Wheel Set Online Measurement
Authors: Wu Kai Hua , Ban Tao
Published: December 2010

Wheel set is the major running components of a train. Online measurement of wheel set wear parameters is important for the safety of train. The acquisition and processing of wheel set profile image is the key problem in an online measuring method based on machine vision. Factors influencing the effect of image acquisition were analyzed. The main factors included environmental illumination, light reflection, CCD exposure time and light source change. An optimal threshold method based on entropy criterion and genetic algorithm for image threshold segmentation was proposed. The optimal threshold was found by iterative analysis. The image segmentation algorithm eliminated effectively the interferences in the image acquisition and extracted wheel set profile curve from varying background. Better segmentation effect ensured the measurement accuracy of wheel set wear parameters.
Rotor Speed Identification of PMSM on DTC System Based on PSO and CMAC Neural Network Algorithms
Authors: Li Li , Cao Shao Zhong
Published: December 2010

Both the PSO (particle swarm optimization) for global search algorithm and the CMAC (cerebella model articulation controller) algorithm are used in the speed loop of direct torque control system in the permanent magnet synchronous motor. Firstly, the PSO algorithm is applied to search the optimal PID parameters in the domain space, and then the CMAC neural network is adopted to learn and train of the results which derive from the output of the PSO algorithm to furthermore optimize the PID parameters which can improve stability of the system. The DTC control system based on PSO with CMAC algorithmic and the traditional DTC (direct torque control) control system are established and simulated in the MATLAB circumstance whose results were all compared. It revels that the DTC control system based on PSO with CMAC algorithmic is fast response, ideal flux, and good anti-jamming.
Research on Services Oriented Group Decision Support System Integrated Platform-Multiple Attribute Group Services Based System
Authors: Yu Xin Qiao , Zhang Wei
Published: December 2010

Group decision making process(GDM) has the characteristic of drawing on the wisdom of the mass, but in current social activities especially the e-business, the corresponding group decision support system(GDSS) are not widely and availably used currently. In this paper, we propose a new GDSS integrating platform with common interfaces to all kinds of GDSS. In this architecture, group decision making processes using multi-attribute decision making(MADM) techniques are regarded as services for new demands, which make decision making processes performed fast but without the loss of wisdom of the mass.
Crack Pattern and Ductility of Connections Composed of CSSEUHSC Columns and RC Beams Subjected to Reversal Cycle Loads
Authors: Zhang Ju , Yan Chang Wang , Jia Jin Qing
Published: December 2010

In order to investigate the crack pattern and ductility of connection composed of cross shaped steel encased ultra high strength concrete (CSSEUHSC) columns and reinforced concrete (RC) beams subjected to reversal cycle load, six interior connection specimens were tested with various axial load ratio and volumetric stirrup ratio. A discussion on the ductility and crack pattern was presented. It was found that cracks appeared in the connection core regions and at the beam end for all specimens, and that axial load ratio had more influence on the crack resistance capacity. The experimental results indicated that test parameters of connection composed of CSSEUHSC columns and RC Beams with good crack resistance performance may be referred for engineering application.
Some Similarity Measures of Interval-Valued Intuitionistic Fuzzy Sets and Application to Pattern Recognition
Authors: Zhang Qian Sheng , Yao Hai Xiang , Zhang Zhen Hua
Published: December 2010

In this paper, we present an effective method for evaluating some similarity measures of interval-valued intuitionistic fuzzy sets(IvIFSs) on the basis of Hausdorff metric. Some properties of the proposed similarity measures are discussed and the related similarity measures are also compared. Finally, one numerical example is given to demonstrate the application of the presented similarity measures of IvIFSs to pattern recognition problem.
Active Subdivision Snake Scheme
Authors: Shi Zhuo , Li Fang
Published: December 2010

Active contours or Snakes are extensively used in computer vision and image processing applications, to locate the object boundaries. Low convergence speed and high complexity in computing have significantly limited their utilities. By taking these problems into consideration, the present research focuses on a novel way in rapid image segmentation methodology. This method utilizes subdivision curves in combination with the Gradient Vector Flow (GVF) snakes to overcome these problems. GVF snakes use region energy minimization which is superior to the mass-spring model of the Tamed snake in whole contour. Furthermore, subdivision curves provide a hierarchical and smooth representation of a shape which is significantly in fine scales. After every step of subdivision, reversely compute the region energy of the subdivision polygon and the local adaptive compensation is carried out. A discrete curvature estimator is used to avoid additional computing in the flat regions of a curve. Therefore, only the segments with high curvature or with fine details require more reverse subdivision computing. Reverse subdivision scheme gives the required flexibility while dealing with a local adaptive compensation. The above-mentioned scheme is similar to dynamic programming. This leads the convergence computing to the appropriate subdivision direction. Rapid reverse computing and absolute reversible and lossless are significant advantages of this scheme. It determines the speed and briefness of the Subdivision Snakes Model. Active Subdivision Snake Model (ASSM) will be very efficient in to detect objects when they are at motion and image registration.
Temperature Variation History Prediction of Fully-Closed Adhesive Joint in Curing Process
Authors: Chen Chu , Lu Zhi Guo , Lin Jian Ping
Published: December 2010

To describe the heat transfer of fully-closed adhesive joint in curing process, adhesive joint, enclosure for closing joints and its inner air are simplified as a multi-lumped-heat-capacity system neglecting the heat from adhesive chemical reaction. Based on heat transfer theory, a temperature prediction model of fully-closed joint was proposed. Combining experimental temperature history of the joint with finite difference method, the combined heat transfer coefficients of adhesive under different curing temperatures were obtained according to Newton's heat transfer formula. And the model was validated by the experiments. The results revealed that the model can be used to predict the temperature of fully-closed adhesive joint in curing process.
The Research of PWM Controlling Capacitance SVC Based on RB-IGBT
Authors: Wang Ke , Chen Bin , Chen Wen Han , Xu Hua , Yuan Jia Xin
Published: December 2010

At first, this paper compared the present some advantages and disadvantages of reactive power compensation devices, and analysis the disadvantages of these devices in practical application deficiencies, then put forward a new kind of reactive power compensation principle. With the development of power electronic devices, this paper put forward a new type of reactive power compensation which based on RB-IGBT of SVC mode, synthesize the advantages of domestic reactive power compensation devices at present, and the prospect of application is very good.
A Novel Public Encryption and Key Agreement Based on Permutation Rational Function
Authors: Wei Peng Cheng , Wu Hai Xia , Yang Hua Qian , Shi Xi
Published: December 2010

The important properties of permutation ration function are surveyed. Subsequently investigate a new permutation rational functions including the aspect of important algebraic, arithmetic and properties. Finally, application of permutation rational function to public-key cryptosystem and key exchange scheme will also be considered.
Research and Improvement of DV-Hop Localization Algorithm for Wireless Sensor Network
Authors: Wang Xue Guang , Lin Jie Ke
Published: December 2010

Rang-free distributed localization algorithm has advantages of low power consumption, low cost etc, but it is weak in the localization accuracy, energy consumption of localization and the algorithm extend ability.That can not meet to the needs of practical application. To overcome the disadvantage of DV-Hop algorithm, in this paper, Two aspects improved algorithm are proposed based on the characteristics research of the original DV-Hop localization algorithm, which are the coverage area of beacon nodes and average size for one hop received by unknown nodes. Simulation results prove their validity and show the performance of the improvement algorithms is superior to the original DV-Hop algorithm.
Optimization of Highway Construction Based on Prim Algorithm
Authors: Zhao Hong , Qin Shao Chong , Zhu Song
Published: December 2010

In this paper, Prim algorithm is used to solve the problem of optimizing inter-city highway paving in highway construction project. In the paper circles are used to indicate the cities, the inter-city highway with the line between circles, and the line weights on the behalf of the relative costs of highway construction. Prim minimum spanning tree algorithm is constructed on the inter-city highway, and finally make the project cost cut down from 53 to 20 in highway construction project and obtain a better eco-efficiency and social benefits under cutting down of the project cost.
Automatic Keyword Extraction Algorithm and Implementation
Authors: Zhao Hong , Bai Chen Sheng , Zhu Song
Published: December 2010

Search engines can bring a lot of benefit to the website. For a site, each page’s search engine ranking is very important. To make web page ranking in search engine ahead, Search engine optimization (SEO) make effect on the ranking. Web page needs to set the keywords as “keywords" to use SEO. The paper focuses on the content of a given word, and extracts the keywords of each page by calculating the word frequency. The algorithm is implemented by C # language. Keywords setting of webpage are of great importance on the information and products
Improving Production Line Performance: A Case Study
Authors: Wan Mahmood Wan Hasrulnizzam , Rahman Mohd Nizam A. , Baba Md Deros , Ghani Jaharah Abd.
Published: December 2010

A case-based research method was chosen with the aim to provide an exemplar of practice and test the proposition that the use of simulation can improve productivity. Three alternatives were performed by considering the aspects of operator, machine, and workstation to define productivity improvement alternatives for operation optimisation. The research determines the optimum result to improve the current operation system. The experiments on simulated and real data clearly indicate that the productivity improvement in the current performance can be achieved by re-allocating the number of operators and machines effectively instead of a combination. The paper presents a novel example of the use of simulation to estimate the production line performance. The paper highlights this method by addressing this operational issue and the likelihood of the success of the strategic decision to improve productivity.
Fuzzy Neural Network Blind Equalization Algorithm Based on Signal Transformation
Authors: Guo Ye Cai , Liu Zheng Xin
Published: December 2010

To recover QAM signals at the receiver of blind equalizer, a Fuzzy C-means clustering Neural Network Blind Equalization Algorithm based on Signal Transformation (ST-FNN-BEA) is proposed. The proposed algorithm uses signal transformation method to debase the computational complexity of equalizer input signals and speed up the convergence rate, and makes use of fuzzy c-means clustering algorithm dividing the equalizer input signals into each cluster center with different membership values to improve the equalization performance. The proposed ST-FNN-BEA outperforms Neural Network Blind Equalization Algorithm (NN-BEA) and Neural Network Blind Equalization Algorithm based on Signal Transformation (ST-NN-BEA) in improving convergence rates and reducing mean square error. The performance of ST-FNN-BEA is proved by the computer simulation with underwater acoustic channels.
Multi-Objective Optimization of Fine-Pitch Gear Based on Variable-Grain Strategy
Authors: Zhao Fu Qiang , Wang Tie
Published: December 2010

A variable-grain strategy is proposed to tackle the complex problem of optimization design of fine-pitch gear with multiple objectives and restrictions involved. Multi-objective optimization mathematical models of various grains are established, in order to ensure the tooth profile optimal and reduce the noise generated by the slide of tooth flank meshing and the mutation of friction torque as criteria to evaluate different schemes. The coarse-grained model is utilized in the early design to efficiently determine the direction to the globally optimal solution. Then more accurate model can be utilized and finally the optimal scheme can be acquired on the basis of the fine-grained model. Based on the theory of meshing noise and the superiority criteria, the algorithm is put forward for the fine-pitch gear design problem, and the Pareto optimal sets are obtained.
Design Method of Strip Would Die for Metal Extrusion Process Based on Fatigue Theory
Authors: Chen Xiu Sheng , Wang Qiang , Cai Dong Mei , Zhang Xian Ke
Published: December 2010

In this paper, failure of die for metal extrusion process is discussed and failure types of the dies are presented firstly. A novel pre-stressed structure named after strip would die is brought forward, which is pre-pressed by thin high-strength steel strips and can provide a radial pre-stress on the external surface of die. The detailed structure of the strip would die is presented. The strip would die is designed according to the iso-strength theory, which means that the steel strip and the die body have the same fatigue lives. Based on the fatigue theory, Analytical model of the die body and the strip is established. Using numerical method and the analytical model, number of the strip layers, pre-stress and the winding tension are determined. Therefore, the design method of strip would die for metal extrusion process based on fatigue theory can be established.
Effect of Laser Shock Processing on Sulfide Stress Corrosion Cracking of X70 Pipeline Steel Welded Joint
Authors: Pei Jun Feng , Liu Jun Ning , He Wei Ying
Published: December 2010

Laser shock processing (LSP) is a new technique for metal surface strengthening by which residual compressive stress in the superficial layer can be induced to greatly improve the stress corrosion resistance property. The effect of LSP on sulfide stress corrosion cracking (SSCC) of X70 pipeline steel welded joint has been studied in this paper. A convergent lens is used to deliver 20 J, 20 ns laser pulses by a Q switch Nd:YAG laser, operating at 10 Hz. The pulses are focused to a diameter of 3 mm onto samples. The power density of laser at the surface of the sample was about 5 GW/cm2. The surface residual stress level after LSP is much higher than before. SSCC behavior of X70 pipeline steel welded joint was investigated using slow strain rate testing (SSRT) in H2S solution. Morphology of X70 pipeline steel fracture surface was observed by scanning electron microscope (SEM). It has been demonstrated that LSP is an effective surface treatment technique to improve the stress corrosion cracking (SCC) resistance properties of X70 pipeline steel welded joints.
Research and Application of Intelligent Humanoid Robot
Authors: Li Tong , Hu Bin
Published: December 2010

With the high-speed development of science and technology, the research and application of the humanoid robot receive more and more attention in the field of intelligent robot.Firstly, the important characters of the humanoid robot are introduced in this paper.Then the architecture of the human robot is analyzed and the research works around the world are overviewed.At last, the prospects for the future research and development are described.
Looper Lifter Movement Simulation for Continuous Hot Rolling
Authors: Zheng Shen Bai , Long Yue , Gao Li Rong , Duan Li Wei , Zhang Li Sheng
Published: December 2010

In the hot strip rolling simulation system, the movement of looper lifter is divided into two stages. First the lifter rises freely, then it is collided with strip bar. For the dynamic simulating, the transfer models and parameters for two serial moment motors or hydraulic looper lifters are built. On the base of a new tension formula, the tension with looper lifter is got by folding.
A Study of Selective Assembly for Product with Multi Mating Features
Authors: Tang Shui Long , Yu Jian Feng , Li Yuan , Yang Hai Cheng
Published: December 2010

In order to firstly assure the mating features of high importance during the selective assembly process, a selective assembly method considering the feature weightings is proposed. All of the features are evaluated by fuzzy entropy weight method. Their weight coefficients which present the importance are defined. Based on the dissymmetrical quality loss function and the weight coefficients, the multi-objective model for selective assembly is established. A specific generic algorithm considering target weightings is used to solve the optimization model. It can search the preference region using the Pareto dominant order to derive satisfactory solutions with high quality. Finally, the method is used for the selective assembly of a certain aero engine’s subassembly to invalidate the feasibility.
Wireless Control Model Based on Rapid Prototyping Equipments
Authors: Guo Yi Na , Li Yong Tang
Published: December 2010

Traditional network control systems require designers to use the serial interface or the bus as tools to control equipments. These ways lead to complicated circuit connection and unreliability of hardware. It is therefore imperative to have good methods to explore a more suitable design choice, which can avoid the problems mentioned above as more as possible. This paper presents a TD-SCDMA network control system based on rapid prototyping equipment in VC++ 2008. It also provides high-level modelling, programming methods and running results for this system in terms of software and hardware. More specifically, this system takes advantage of network control technology, TD-SCDMA network technology and advanced manufacturing technology. Wireless communication and control are accomplished timely and accurately between the network control centre and a number of controlled equipments by use of Winsock control in TD-SCDMA network. This system also can manage the historical data by using database. Furthermore, it has such advantages as low cost and easy to maintain and promote.
Green Manufacturing: A Lever-Wedge Self-Locking Force Amplifying Clamping Device Driven by Linear Motor
Authors: Song Qiang , Si Guang Ju , Su Dong Ning , Zhong Kang Min
Published: December 2010

Here introduces a kind of clamping device which is driven by linear motor and makes use of lever-wedge serial mechanism to amplify input force and to realize self-locking. We analyze its working principle and structure feature, give the calculation formulas of force amplification coefficient and output force. Compared with hydraulic clamping device or pneumatic clamping device, this kind of clamping device has the advantages: few conversion segments, no energy consumed during machining and no environment pollution.
Human Factors Assessment Based on the Technology of Human Motion Capturing
Authors: Zhou Dong , Guo Zhi Qi , Wang Mei Hui , Lv Chuan
Published: December 2010

We aim to combine the technology of capturing human motion and the technology of virtual reality to carry on assessment of human factors. The unique point in this method is that not only the reliable data of the maintenance worker can be gained, but also the quantitative analytic result based on the virtual environment can be obtained. In the paper, human motion capture technology, ergonomics evaluation and the interface technology have been considered comprehensively. overall technical program of human factors evaluation, which is based on human motion capturing technology, have been carried on; the technology, which include the captured data of human motion translating into the virtual environment, building the virtual human model and virtual human simulation, both based on captured data in the working site, are taken as innovations; replicable technology of the captured data in the virtual environment have been broken through. Carrying on the quantitative analysis of worker working postures, fatigue and human force and torque in the maintenance process, which is based on the technology of human factors evaluation by using the captured data in the working site, is researched. We have verified the feasibility of this technology through an example. The method provides a new way and operational technology for human factors assessment in maintenance process of aviation equipment.
Design of a New Non-Contact Torque Sensor for Rotating Stepped Shaft by Monitoring Magnetic Field
Authors: Shi Gang , Wang Na , Cho Chong Du
Published: December 2010

In this paper, a new non-contact sensor is presented for detecting torque of a rotating stepped shaft which is frequently employed in power transmission system. This sensor doesn’t require cutting or lengthening the rotating shaft. Torque value is obtained by using two magnetic sensors to sense magnetic field intensity of two permanent rubber magnets fixed at the outer surface of the shaft. The phase difference between these two induction signals is used to determine torque of the stepped shaft. A real-time algorithm based on LabVIEW is employed to obtain the measured torque value. The present work has demonstrated that non-contact torque measurement for rotating stepped shaft by monitoring magnetic field is feasible. It seems like that further development will result in low-cost torque sensor. It is hoped that this kind of sensor can lead to a new development direction of torque sensor for rotating shaft.
Production Planning Considering Transfer Lot Size
Authors: Zhang Zhi Cong , Hu Kai Shun , Huang Hui Yu , Li Shuai
Published: December 2010

Traditional methods conduct production planning and scheduling separately and solve transfer lot sizing problem between these two steps. Unfortunately, this may result in infeasibility in planning and scheduling. We take into account transfer lot size in production planning to obtain the consistency and to eliminate the gap between planning and real production. We present the detailed Transfer Lot-Based Model with mixed integer programming. Experiments show that performance measures of a production plan change remarkably with increasing of transfer lot size.
Dynamic Method for Portfolio Choice of Manufacturing Processes Based on Copulas
Authors: Wang Zhi Guo
Published: December 2010

Multivariate volatility modeling is always a hot topic in academic research. It is difficult to consider how to construct multivariate joint distribution. Copulas, a statistic method, can be used to decompose multivariate joint distribution into marginal distribution and correlation structure. This advantage is applied into calculating the dynamic VAR of a portfolio in the paper. Furthermore, a new model for dynamic portfolio choice based on copulas is proposed, and empirical analysis is operated for the several typical discrete manufacturing processes in the end.
Lock-in Infrared Thermography for the Non-Destructive Testing of Fatigue Specimen with Defects
Authors: Zhao Yan Guang , Guo Xing Lin , Ren Ming Fa
Published: December 2010

Lock-in infrared thermography method was gradually being used in fatigue studies because of its advantages such as real-time, quick-reaction, non-contact, non-destructive and so on. In this paper, non-destructive testing was applied to fatigue specimen with defects, based on lock-in infrared thermography. In parallel, the result was analyzed by using lock-in infrared thermography system developed by Cedip in French. The results show that more information of internal detects can be found from phase image than that from amplitude image. The experiment procedure indicated that a proper testing frequency was the key to the non-destructive testing. The data revealed that deeper depth and larger area of defect led to a precise testing result.
Analysis of Cause for China's Food Safety Problem Based on Profit Distribution Structure in Supply Chain
Authors: Tong Guang Ji , Qin Li
Published: December 2010

On the discussion of food safety, the majority of China's scholars believe that the food manufacturer should responsible for its inferior products. The food manufacturer should be punished by government more than that of wholesaler and retailer. But the punishment produces less effect on the food manufacturer’s adverse selection. This paper establishes a three-sector model, and analyzes empirically the distribution of benefits among food manufacturer, wholesaler and retailer. The research result shows that the unreasonable distribution of benefits resulting in manufacturer’s adverse selection on food safety in supply chain. Therefore, in order to improve the governance of food quality and safety, government should concern about the distribution of benefits among food manufacturer, wholesaler and retailer in supply chain. Based on the above analysis, this paper puts forward some corresponding recommendations.
Assessment of Damage from Organic Protective Coating Treatments to Historic Stone Buildings and Sculptures
Authors: Liu Qiang , Zhang Bing Jian
Published: December 2010

The conservation of historic stone buildings and sculptures is receiving growing attention because of weathering. Now, the techniques for stone conservation are primarily achieved through the use of organic coating treatments. Although some defects of organic protective materials have been recognized, the further shortcoming is still short of awareness. Here we show our investigations of the side effect of organic coating treatments. Some kinds of common stones, including sandstone, tuff, granite, dolomite and marble, were selected as protected objects. Organic silicon compounds were used as protective coatings. The artificial weathering, including salting, freezing and heating, was designed. The treated stones’ decaying was investigated. The results reveal that the treated stone decaying is aggravated. Moreover, the destruction mechanism has been discussed.
State Feedback Control to Track a Moving Object for a Non-Holonomic Mobile Robot
Authors: Hui Yan Cui , Peng Yi Qiang , Ye Xian
Published: December 2010

In this paper, a state feedback control algorithm for non-holonomic robot to track a moving object is described. In order to generate continuous velocity profile, some independent time varying functions are introduced for calculation the state feedback variables. The simulation of the control algorithm is implemented with MATLAB. The results shows that, with the designed state feedback control algorithm, the wheeled mobile robot can track a moving object and the trajectory is also reasonable.
Buffet Effect Simulation Model on Demand Chain Management
Authors: Wang Xiao Yan , Sun Jian
Published: December 2010

Bullwhip effect means the magnification of demand fluctuations, which is evident in a supply chain when demand increases and decreases, while the concept of Demand Chain Management means to make the planning on the basis of the demand side information so as to solve the problem of inconsistent upstream and downstream information by means of partner collaboration in the supply chain. Demand chain emphasizes the customer demand as its core value so as to achieve the best balance between the supply chain efficiency and customer satisfaction. Compared with the supply chain, the demand chain advises the enterprise to strengthen the information transmission ability to promote the performance. Under the demand chain management, the extent of bullwhip effect are weakened, and the fluctuation range against demand chain management is lower than against traditional supply chain.
Hardware-in-Loop Simulation on Hydrostatic Journal Support Pose
Authors: Han Gui Hua , Wang Ya Ping , Zhong Yan Chun , Shao Jun Peng , Yu Xiao Dong , Zhang Yan Qin
Published: December 2010

A scheme of improving performance of hydrostatic journal support was presented, that is, control journal support pose by controlling flow of four controllable chambers and Coupling various oil film thickness, to assure journal support expected pose; Chamber flow can be regulated by electro hydraulic servo valve-control variable pump according to the surface roughness, load, cutting force, and thermal results of journal support. The mathematical model of the controllable chambers flow, servo variable mechanism and controller were built; the pose control model was established, which contain the kinematics positive and negative solution and control strategy of hydraulic cylinder position feedback; Hardware-in-loop simulation experiment was carried on the electro hydraulic servo test bench by mean of the non-linear relation of film thickness and the hydraulic cylinder displacement. Simulation and Hardware-in-loop simulation experiment results show that the controllable journal support exhibit high oil film rigidity can stably and quickly track the expected goal and can be broadly applied in high precision heavy horizontal machine tool.
Identification of the Dynamic Properties of Linear Joints Using Substructure Synthesis Method
Authors: Li Ling , Cai Li Gang , Guo Tie Neng , Liu Zhi Feng
Published: December 2010

In this thesis, a new identification method for joint stiffness and damping has been developed by using the substructure synthesis method and finite element modeling. The substructure synthesis method is stated firstly, according to the substructures are connected by joints and the equilibrium and compatibility conditions at the joints have to be fulfilled, establishing identification equation through completely frequency response function. Then, finite element model is established, and update this model, make use of the update model to replace the experimental model, using an accurate finite element model to obtain the required data. In order to ensure the stability of the numerical calculation, translate inconsistent equation into the general solution through the principle of least squares, besides the introduction of the concept of weighted, makes the measured data can be fully utilized. Finally, the method is applied to a simulated example and good agreement is found between identified and true parameters.
EMR System for Orthodontics Based on Flex and SSH
Authors: Zhang Wen Jun , Liu Yi , Yang Ai Min , Jiang Yan
Published: December 2010

Because no commercial EMR system in the field of orthodontics is suitable for orthodontist’s purposes now, we study orthodontist’s daily workflow, analyze the requirements, and finally develop the EMR system, Decision-Support and Orthodontist Management for Peking University School of Stomatology. We adopt advanced Rich Internet Application (RIA), such as Flex, to implement business process, human-computer interaction and data visualization on the client-side according to orthodontist’s workflow; SSH (Struts, Spring, Hibernate), three popular Web design frameworks based on Java EE, to implement orthodontist’s business logic and data persistence on the server-side so as to develop low-coupling codes. And the EMR system is integrated with existing Resister, Ward and Drugstore information systems. The practice shows that the EMR system can fit seamlessly into orthodontist’s daily workflow and effectively replace current paper medical records.
Design of Milling Cutter for Machining Helical Curved Surfaces
Authors: Yang Jian Jun , Wu Qin , Gong Jun , Rui Zhi Yuan
Published: December 2010

The article focused on the design of milling cutter for machining helical curved surfaces. First, the characteristics of 3th generation profile in screw compressor were presented; then the equation of touch line between milling cutter and workpiece was constituted based on the envelop principle from milling cutter rolling surface and spiral curved surface; and elementary theories and methods were put forward for designing contour of milling cutter in machining spiral curved surfaces, finally the calculate equation was validated through the machining example by Matlab.
The Modeling and Simulation of Sheet Metal Flexible Manufacturing System Based on eM-Plant
Authors: Chen Zai Liang , Wang Sheng Tao , Wu Dong Min , Wang Ji Ne
Published: December 2010

The components of sheet metal FMS are abstracted corresponding eM-Plant object, the sheet metal FMS’s automatic guided vehicle system and parts management system are built in eM-Plant. Adjusting the system parameters in the model, several simulations obtained an ideal simulation result. These research show that, using eM-Plant software to build model and simulate for sheet metal FMS can save time, improve simulation result of sheet metal FMS.
Analysis on Meaning and Current Research of Holonic Manufacturing Execution Systems
Authors: Tang Hong Tao , Wu Ying Jing
Published: December 2010

Systematic analysis is made on meaning and current research of Holonic Manufacturing Execution Systems (HMES). Characteristics of HMES are pointed out. It lies in the distributed structure and distributed decision-making mechanism come from holon, as well as the essence of being a shopfloor management information system. Papers on HMES are analyzed from three aspects: control framework construction, development framework and implementation. Control framework construction is the main research direction. Most of the frameworks are built on PROSA, and concentrated with emphasis on real-time scheduling on the manufacturing execution process to gain an optimized solution when faced random disturbance. As opposed to traditional legacy Manufacturing Execution Systems (MES) and framework MES, HMES has certain superiority, implementation and application of HMES also have good prospect. But because of the limitation of distributed decision-making mechanism, practical application has certain difficulty, which leads to the research work relatively slow.
Advanced Low-Carbon Technologies for Steel Manufacturing Process
Authors: Sun Wen Qiang , Cai Jiu Ju , Zhang Da Wei , Guan Duo Jiao
Published: December 2010

A general review was made on research of advanced reducing carbon dioxide (CO2) emissions’ technologies for steel manufacturing process in this paper. Various technologies – ultra low CO2 steelmaking (ULCOS), CO2 ultimate reduction in steelmaking process by innovative technology for cool earth 50 (COURSE50), solar iron-making, CO2 mineral sequestration by slag and active carbon recycling energy system (ACRES), etc. – have been represented respectively. Finally the establishing of an energy flow network from the systematic point of view was recommended.
WSN Networking Protocol Based on Dynamic Changing Channel
Authors: Jiang Yu , Liang Yan Chun , He Li Li , Cao Ying Hui , Hu Cheng Quan
Published: December 2010

Based on the analysis of the wireless sensor networks in the application of the public utilities, a new approach which can change channel dynamically in buildings using wireless sensor networks was designed and implemented. In this paper, the WSN platform supported for AES encryption. And on the basis of the TDMA protocol, using linear regression and BBS generator, a new WSN protocol which has the ability to change communication channel dynamically was designed. Compared with traditional network protocols, the proposed method can decrease the degree of network congestion, energy consumption, program complexity and easy to achieve.
Supply Chain Coordination under Asymmetric Disruptive Demand
Authors: Zhu Chuan Bo
Published: December 2010

Under the circumstance of disruptive demand, the decision-making and coordination of enterprise’s capacity is directly related to the efficiency of supply chain operation. On the basis of the baseline case, capacity reservation contract sees that the performance of decentralized supply chain is equal to the centralized supply chain, and better than the level of the optimal supply chain capacity under the wholesale price contract. For disruptive demand, this paper discusses the conditions of capacity expansion and supply chain coordination through the capacity reservation contract in two cases, i.e., symmetric disruptive information, asymmetric disruptive information, and compares the optimal capacity and the corresponding profit.
Finite Element Analysis and Structure Optimum of Rectangular Cylinder
Authors: Pang Gui Bing , Teng Fei , Yuan Chang Feng , Li Dian Min , Wang Feng Yin
Published: December 2010

In the press forming of some rectangular workpieces such as floor tiles and automobile panel, in order to make the hydraulic pressure distribute on the workpiece evenly and reduce the dimension of the cylinder, the rectangular cross-section piston has comparative advantages to the ordinary rounded cylinder. Finite Element Analysis (FEA) method is used to simulate the stress and deformation distribution of the rectangular cylinder. It is found that the largest deformation region is on the central of cylinder, the corner of the cylinder has the maximum stress. To decrease the deformation and stress, the convex cross-section shape and rounding corner is used, which effectively reduces the deformation and stress. By analyzing the influence of stress and strain under the conditions of different radius of the corner and different convexity of the cylinder wall, structure of the cylinder is optimized.
Theoretical and Numerical Modal Analysis for Nuclear Coolant Pump and its Scaled Rotor System
Authors: Gong Chun Ming , Shen Hong , Yao Zheng Qiang
Published: December 2010

This paper presents a theoretical transfer matrix method for the modal analysis of nuclear coolant pump, and base on certain similarity law, a scaled rotor system is designed so as to simulate the characteristics of the real nuclear coolant pump, especially the vibration characteristics. Following that, the finite element method is used to verify the accuracy of the above theoretical method since there are a few simplifications in theoretical method compared with the finite element method. Finally the natural vibration frequencies and vibration modes of both nuclear coolant pump and the designed scaled rotor system are attained, which have high similarity with each other, and which confirm the accuracy of the two methods that are used in this article.
Semantic Enabled 3D Object Retrieval
Authors: Zhou Jiang , Ma Xin Yu
Published: December 2010

In the case of traditional 3D shape retrieval systems, the objects retrieved are based mainly on the computation of low-level features that are used to detect so-called regions-of-interest. This paper focuses on obtaining the retrieved objects in a machine understandable and intelligent manner. We explore the different kinds of semantic descriptions for retrieval of 3D shapes. Based on ontology technology, we decompose a 3D objects into meaningful parts semi-automatically. Each part can be regarded as a 3D object, and further be semantically annotated according to ontology vocabulary from the Chinese cultural relics. Three kinds of semantic models such as description semantics of domain knowledge, spatial semantics and scenario semantics, are presented for describing semantic annotations from different viewpoints. These annotated semantics can accurately grasp complete semantic descriptions of 3D shapes.
Fuzzy Knowledge Representation for Fuzzy Systems Based on Fuzzy Ontology on the Semantic Web
Authors: Zhai Jun , Qu Li Li , Chen Yan , Li Jian Feng
Published: December 2010

Ontology is adopted as a standard for knowledge representation on the Semantic Web, and Resource Description Framework (RDF) is used to add structure and meaning to Web applications. In order to incorporate fuzzy systems into the Semantic Web, this paper utilizes fuzzy ontology to represent formally the fuzzy linguistic variables, considering the semantic relationships between fuzzy concepts. Then fuzzy rule is described as a RDF resource with properties: “IF” and “THEN”, and rule's antecedent and consequent is represented in RDF statement. Taking the fuzzy control system of industrial washing machine for example, the fuzzy system with ontology and RDF is built, which shows that this research enables distributed fuzzy applications on the Semantic Web.
Prediction of Chaotic Time Series of Bridge Monitoring System Based on Multi-Step Recursive BP Neural Network
Authors: Yang Jian Xi , Zhou Jian Ting
Published: December 2010

BHM is an important means to assess and predict the safety operation of large bridge in service around the world. Given the missing of real-time monitoring information for some time and the lack of effective theory and technique to capture the missing information and even to predict the evolution of structure, this paper made an attempt to predict the evolution of monitoring information using time series and chaotic theory. Firstly, maximum Lyapunov exponent of available monitoring information is calculated to assess the chaos of the bridge structure. The parameters of reconstructed phase space, correlation dimension and time delay, are calculated by C-C algorithm and G-P algorithm respectively. According to empirical formula, one 3-layer BP neural network is established Ten recursions are carried out. The results show that multi-layer recursive BP neural network is able to predict BHM information. Using chaotic time series to reconstruct phase space and applying multi-layer recursive BP neural network to predict BHM information facilitates further estimation and prediction of bridge safety condition by means of chaotic nonlinear characteristics.
Research Progress on the Bamboo Timber Preservation
Authors: Liu Ya Di , Liu Wen Jin
Published: December 2010

With the extensive utilization of the bamboo industrialization, especially in developmental fields of bamboo-based panel, bamboo composite board, bamboo decoration, furniture manufacturing, which makes the application of bamboo have a broader prospect. However, the bamboo and its products in process of processing, transport and implementation often appear mildew, decay, moth-eaten, especially the mildew, it not only affects the appearance of bamboo and its products, but also creates damage conditions for other bacteria and insects. Therefore, bamboo timber preservation processing is the essential link for using bamboo industrialization. From the kinds of bamboo mould and its physiological characteristics, anti-mould technology and the types of mould inhibitor, this paper introduces the general situation at home and abroad and the existing problems and development trends of bamboo timber preservation, aiming to have a more comprehensive and systematic understanding of people for the bamboo mould and timber preservation, and to provide references for further study on the comprehensive anti-mould technology and preparation.
Research and Utilization Status of Natural Bamboo Fiber
Authors: Li He , Zhou Guo Ying , Zhang Huai Yun
Published: December 2010

The natural bamboo fiber is a green environmental protection type fiber material extracted from bamboo. Compared with other fibers, it has better permeability, unique resilience, transient water absorption, antibacterial activity, deodorant activity, and a strong lateral and longitudinal strength. This paper reviews the structure of natural bamboo fiber and its characteristics, physical morphology, chemical composition, hygroscopicity and moisture liberation, antibacterial activity, anti-ultraviolet function, spinning performance of the development and utilization status of bamboo fiber, which provides reference for the research and utilization of natural bamboo fiber.