bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Information Architecture Model in Building of Online Community
Authors: Zhou Shan Shan , Bi Qiang
Published: June 2013

With the development of modern information technology and the popularity of the Internet, people's lives, learning, work and exchanges have been profound changes, more and more people use QQ, MSN, E-mail Blog, BBS tool cyber space exchanges and communication, and gradually formed one by one based on individual interests and the common information needs of different network aggregates, that is the online community. The network thus also entered the era of community, online communities are popular, is becoming popular in the online world users to access, an important platform for exchange and dissemination of information. From the micro-, macro-different aspects of a comprehensive analysis of online communities, information on the organization mode, and focus on the individual needs of community members as the starting point, put forward the online community in the personality of the information the organization mode of the build program, improvements to the online community information organization mode and optimization of important reference value.
Modeling Wireless Network Topology Based on the Theory of Complex Network
Authors: Jiang Zhi Yong
Published: June 2013

Much of the work on routing algorithms, particularly for multicast, which has been done in the past has used fairly simple models to generate the topological graph which represents the hosts in the network. Good models of the topological structure of a network are essential for developing and analyzing wireless network technology. This paper proposes a more realistic model based on the theory of complex network, incorporating hierarchy and redundancy, and is developed into a network generation algorithm.
Adapting eXtreme Programming Approach in Developing Electronic Document Online System (eDoc)
Authors: Bahrudin Ida Aryanie , Mohd Hanifa Rafizah , Abdullah Mohd Ezree , Kamarudin Muhammad Firdaus
Published: June 2013

eXtreme Programming (XP) is one of new discipline of software development methodology on values of simplicity, communication, feedback and also courage. XP is an explorative and agile development method that seeks to satisfy the customer through early and continuous delivery of valuable software. XP software development process starts with planning, and all iterations consist of four basic phases in its life cycle: designing, coding, testing, and listening. This paper tends to report the experience in adapting XP in developing electronic document online system for the use of Centre for Diploma Studies, Universiti Tun Hussein Onn Malaysia (eDoc). The project under study is a system that is use to store office documents such as letter in an online database. The objective of this paper is to discuss the XP practices that had been choosed and also the lesson learnt by practising XP in developing eDoc.
Design and Implementation of Network Forum Based on SSH2
Authors: Han Gui Ying
Published: June 2013

The framework of Struts2, Spring2.5 and Hibernate3(SSH2) was discussed and used to design and implement a network forum system. The system used the MySQL as the back-end database and adopted the reflection mechanism provided by the Spring framework to load the data access layer and introduced the AOP thinking to manage users rights. It also used the AJAX and the JQuery technology to provide users with a more accessible experience. The forum according to different rights of the users provides the functions of user management, resource management, post management, information search, forum management, message management, etc. It achieves a practical network platform for the university students to learn and communication.
Effective Generation of Test Case Based on Genetic Algorithm
Authors: Shi Zhi Guo , Zou Li Ren , Tong Da Peng , Wang Ming Qian
Published: June 2013

With people pay more and more attention to component software testing, the generation of test case is as one of the important works of software testing, it becomes a hotspot inevitably. For component software testing, making combination of the testing method based on model and testing method based on Genetic Algorithm, this paper proposes a generating method of test case which based on UML (Unified Modeling Language) activity diagram and Genetic Algorithm, and gives the overall design and implementation steps of the method. Then this paper applies the proposed method to model the adding table business in catering management system, and design test case. The example verifies the feasibility and validity of the method.
A Multibank E-Cash System Based on Group Signature Scheme
Authors: Duo Chun Hong
Published: June 2013

Group signatures allow members of a group to sign messages anonymously on behalf of the group. Only a designated group manager is able to identify the group member who issued a given signature. In this paper we propose a new group signature scheme based on RSA, which is a blind signature algorithm. A multibank E-cash system has been presented based on the proposed scheme. A general design scheme including withdrawal, payment and deposit process is discussed particularly.
A Quantitative Indicator Evaluation on the Applicability of China’s E-Government Micro-Blog Based on AHP Perspective
Authors: Liu Ze Zhao , Li Wen Jun
Published: June 2013

With the development of China’s e-government, online digital government micro-blog (GMB) have become one of the emerging areas of the service-oriented administrative build-up. In this paper, we conducted a quantitative and qualitative probe on effect issue and are devoted into the applicability analyses. Based on Nielsen’s usability principle, a theoretical model of applicability is initially constructed. From the perspective of citizen’s needs, the paper evaluates the weight of indicators that represent applicability by the approach of Analytic Hierarchy Process(AHP) . Findings from the study suggested that China’s GMB practice is still at its early developmental stage under standard of quantitative scope and needs upheaval in system construction.
The Weibull Distribution of Microhardness in Plasma Sprayed NiCrAl/AT13 Nanostructured Ceramic Coating
Authors: Tan Gao Xu , Wang Tong , Bi En Bing
Published: June 2013

Al2O3-13% TiO2 based nanostructured ceramic coatings were prepared on the surface of NiCrAl alloy by Plasma Spraying technology. Compared to the micron ceramic coating (MCC), the average value of hardness of nanostructured ceramic coating (NCC) was much higher than that of MCC, and the NCC presents typical bi-modal distribution. The Weibull distribution of both coatings exhibited apparently dispersible, but NCCs was quite well-distributed. The relationship between microhardness and microstructure were analyzed through SEM, XRD and TEM. The results indicate that the microcracks of NCC are fine and the size of particles is small. The structure of NCC coatings contained more α-Al2O3 and TiO2 and less γ-Al2O3 than that of MCC coatings. According to TEM analysis, it can be considered that the grain refinement, toughening of microcracks, and the dispersive refinement of Al2O3 nanoparticles on Al2O3-TiO2 matrix are main mechanisms to improve the mechanical properties of NCC.
The Design of Wideband DC Amplifier Based on FPGA
Authors: Yang Shou Liang , Zhang Dong
Published: June 2013

Wideband DC Amplifier plays an important role in scientific research and measuring instruments. This paper presents a wideband amplifier with controllable DC voltage gain with a programmable gain amplifier AD600, 12-Bit Serial D / A chip DAC7611 and FPGA-based IP MCS-51 MC as its core. Test results show that the pass band of the whole system is 0Hz ~ 10MHz, the voltage gain ranges from 0dB to 60dB, the gain step is 1dB, the maximum output voltage sine wave RMS Vo ≥ 10V, and there is no significant distortion in the output signal waveform. The system is not only characterized by its high speed, high efficiency, small size and in-built orientation of peripheral circuits, which are the features of MC constructed with a MC with FPGA, but also has advantages of flexible designing, scalability, extensibility and upgradability. Therefore it has good application prospects and research values.
Modelling and Analysis of a Novel Mechanism for EMT Actuator
Authors: Liu Hao , Chen Xin Bo , Cao Peng Biao , Zhang Qing Yu
Published: June 2013

The gearshift actuator system is of significant importance to the performance of shiftability. In this paper, we aim at a novel electric gearshift actuator which is used in a hybrid transmission. The basic topology, working principle and characteristics are discussed. A model established to analyze shift application, durability and reliability of key components is developed. Existing problems and critical issues for further research are discussed as well.
Fabrication and Characterization of p-CuSCN/n-Si Heterojunction Diode
Authors: Xiong Chao , Yuan Hong Chun , Chen Lei , Xiao Jin , Ding Li Hua , Zhu Xi Fang , Zhou Xiang Cai
Published: June 2013

The p-CuSCN /n-Si heterojunction diode have been prepared at a low cost by chemical method. The prepared hexagonal β-CuSCN films are polycrystalline nature. The heterojunction shows a good rectifying behavior and photovoltaic effects. The current and 1/C2 versus voltage curve of the p-CuSCN/ n-Si heterojunction diode was shown. The linear relationships of 1/C2 versus voltage curve imply that the built-in potential Vbi and the conduction band offset of the heterojunction ware found to be 2.1 eV and 1.5 eV, respectively. The current transport mechanism is dominated by the space-charge limited current (SCLC) conduction at forward bias voltages. The electronic potential barrier in p-CuSCN/n-Si heterojunction interface higher than hole at forward bias voltages. In this voltages area, a single carrier injuction was induced and the main current of p-CuSCN/n-Si heterojunction is hole current.This heterojunction diode can be good used for light emission devices and photovoltaic devices.
670nm Single Wavelength Nd:YAG Ceramic Laser
Authors: Wu Zhi Chao , Zhang Xiu Li
Published: June 2013

The Nd:YAG ceramic laser at 670 nm was studied by means of dispersion prism and KTP intracavity-frequency-doubling. We designed and optimized the cavity parameters by MatrixLaser software based on the standard ABCD ray propagation matrix. By using the laser diode arrays side-pumped Nd:YAG ceramic crystal with Nd doping concentration of 1.1at% and dimension of Φ3×50 mm, the Nd:YAG ceramic laser at 670 nm was realized. Under repetition rate of 1 000Hz and single pulse pumped energy of 144 mJ, the output energy of 5.1mJ at 670 nm is obtained. The optic-optic efficiency is 3.54%. The results not only formed the basis for the further development of the high power and high efficiency ceramic red laser, but also provided a great prospect for the high power ceramic red laser in the field of medical treatment, color display and other areas of application.
Optical Properties of the LaNi4.5M0.5 (M=Al, Mn) Intermetallic Alloys
Authors: Chen Dong , Xu Chao
Published: June 2013

The aim of this study is to determine the optical parameters of the ternary alloys LaNi4.5M0.5(M=Al, Mn) by using first-principles calculations. Through the computer simulation, we have successfully obtained the absorption coefficient, optical conductivity and dielectric function of these alloys. These alloys are transparent for the electromagnetic waves with frequencies of 12eV~15eV. The calculated dielectric constants are 188.3 and 257.6 for LaNi4.5Al0.5and LaNi4.5Mn0.5, respectively. Our result is compared with the previous study and a good agreement is found.
The Application of Fiber Bragg Grating Sensors in High Voltage Switchgear Contact Temperature Measurement Monitoring System
Authors: Yuan Xiao Hua
Published: June 2013

The power system is the system by a large number of generation, transmission, distribution and utilization electrical equipment connected. The reliability of these devices directly determines the stability and security of the entire system. High Voltage Switchgear contacts run in high voltage and high current state, is closely related to its operational reliability and contact temperature rising. During the grid operation, the mechanical vibration, the contact ablation and other reasons could deteriorate the exposure conditions; increase in contact resistance, causing the temperature rise of the contact, exacerbate the contact surface oxidation. Resulting arcing at partial of welded or contact loose. Eventually cause damage to the electrical equipment and even power outages and other major incidents. Therefore, the contact temperature of the high-voltage cabinet line monitoring is of great significance.
Node Positioning Algorithm in a Wireless Sensor Network
Authors: Liu Wei , Du Qin Sheng , Wang Le Le
Published: June 2013

Node positioning technology in the Wireless sensor network is a very important issue. This article introduces the ant colony algorithm and its characteristics. It is a good solution to the static and dynamic portfolio optimization problem. The node positioning method in the wireless sensor network can be divided into two categories based ranging and no ranging. In order to get a higher positioning accuracy, and a further improvement the positioning accuracy, this paper introduces the ant colony optimization algorithm based on the first positioning method of the feasibility. The experimental results demonstrate the decrease of the number of transmitting beacon and the optimal mobile path after being optimized.
Rapid High-Precision Non-Linear Calibration for Temperature Sensors in Transient Aerodynamic Heating Simulation Systems
Authors: Wu Da Fang , Wu Shuang , Wang Yue Wu , Gao Zhen Tong , Yang Jia Ling
Published: June 2013

In order to accurately simulate the transient aerodynamic heating conditions experienced by aircraft when flying at high speeds, rapid and highly precise non-linear dynamic control of the heating process in aerodynamic simulation experiments must be conducted using a transient heat flux control system. This process involves carrying out ‘thermoelectric potential - temperature (E-T)’ conversion of sensors. Here a fast and high-precision ‘E-T’ sensor conversion method for the transient aerodynamic heating control systems of high-speed aircraft is proposed. The developed method has the advantages of easy calculation, rapid conversion speed and high calibration precision, and can thus be employed for fast non-linear dynamic control of rapidly-changing temperature fields in the aerodynamic heating process of high-speed aircraft.
Design of Follow-Up Control in Auto-Tracking Smart Car System
Authors: Ji Yi Bo , Zhang Yang , Liu Zhi Long
Published: June 2013

Aiming the problems caused by the narrow path recognition range of auto-tracking smart cars, this paper proposes a follow-up control based on the Freescale K10 microcontroller. A laser detection sensor was used to percept the path information. And a follow-up steering servo was used to drive the laser detection sensor to track the road path and controlled by the PID algorithm. Moreover, the system combined Ziegler-Nichols method and trial-and-error method to tune the PID parameters. Experiments show that, the smart car with the follow-up control has a wider path recognition range, an improved driving path and a higher speed.
Design of Remote Temperature Detection System on the Base of GSM SMS Module
Authors: Zeng Peng , Ling Ze Ming , Liao Lin Zhi
Published: June 2013

The article comes up with a design method of remote temperature detection system which uses GSM SMS module and C8051F020 MCU as core components. Temperature acquisition chip adopts single intelligent temperature sensor DS18B20. Through GSM network, it transfers the temperature value to the main controlling center or operator’s mobile phone. It can realize loop detection of temperature data at multiple points. This system has the many features, such as high integration level, strong controlling function, wide application range, etc. It has certain practical application value.
On the Future Trend of CAT Technology
Authors: Tian Xu Jun , Tian Ya Zhou
Published: June 2013

The author discusses the importance of Computer-aided translation (CAT hereinafter) translation technology as a result of the booming international communication and then probes into the research and development of CAT technology and its theoretical approaches, and finally looks into its future trend.
A Model-Based Fault Detection Methodology for Vacuum Circuit Breaker
Authors: Zheng Yu Huang
Published: June 2013

Vacuum circuit breaker becomes more and more complicated, integrated, high-speed and intellectualized. To insure vacuum circuit breaker in its good conditions, the function of fault diagnosis gets more important than before in the process of repairing. This paper is addressed a model-based fault detection methodology for vacuum circuit breaker. At first, the dynamic model of vacuum circuit breaker is built. Secondly, DTW algorithm is introduced to compute the similarity value between the test data and the theoretical data. At last, the value comparison between the similarity and the threshold concludes whether a fault has occurred or the vacuum circuit breaker has potential hazardous effects. The experimental results show that this method is effective.
Real-Time Prediction Method for Performance Degradation Trend Based on Reliability Experimental Data
Authors: Song Chen Liang , Liu Zhen , Long Bin , Yang Cheng Lin
Published: June 2013

According to the real-time prediction for performance degradation trend, the commonly used method is just based on field data. But this methods prediction result will not be so much ideal when the fitting of degradation trend of field data is not good. To solve the problem, the paper introduces a new method which is not only based on field method but also based on reliability experimental data coming from the history experiment. We use the relationship between the field data and reliability experimental data to get the result of the two kinds of data respectively and then get the weights according to the two prediction results. Finally, the final real-time prediction result for performance degradation tendency can obtain by allocating the weights to the two prediction results.
Research on Mine Monitoring Technology Based on Internet of Things
Authors: Qi Yan Jun
Published: June 2013

In order to find out the status of unmanned area and staff position in mine, the important content for intelligent mine is the detection and location of personnel underground. Analyze the architecture of location system and location principle based on Internet of Things (IoTs) along with ZigBee wireless networks and pyroelectric sensor technology. In the meantime, Install test wireless network nodes and achieve measurement data. The results show that this technique is suitable for the worse physical conditions in mine, lower in cost, higher accuracy in location and detection. The scheme can greatly improve the level of coal mine safety production and reduce the occurrence of catastrophes and casualties.
Feature Extraction Based on Color Difference Algorithm for Moving Target Detection System
Authors: Hu Xu , Mao Xiao Bo
Published: June 2013

To improve the accuracy and robustness of the moving object detection in the image sequence, the author improves the traditional algorithm which is based on the gray-value difference. The author makes good use of the color information of images and applies the pixels in red, green, blue the three component value as its identifying information. According to the background image color composition, it adapts and adjusts the proportion of the three groups. Dynamic threshold is used to do the binarization separation of the background difference image. The simulation experiment shows, this algorithm makes full use of the color features of image and achieve the expected goal of high recognizability and good robustness.
The Status and Requirements of Remote Sensing Application in Immigration of Water Resources and Hydropower Project
Authors: Chen Hao , Liang Tian , Ma Li
Published: June 2013

The immigration is important in water resources and hydropower project. Using remote sensing and information technology is a significant means of improve performance. This paper sums up the status and demand of remote sensing application in immigration of water resources and hydropower project.
Dynamic Modeling for a Miniature Six-Rotor Unmanned Aerial Vehicle
Authors: Ma Qi Dong , Sun Zhen Guo , Wu Jing Ran , Zhang Wen Zeng
Published: June 2013

A nonlinear dynamic model of a miniature Six-Rotor is presented. A 4 channels PID controller is designed to operate the under actuated and dynamically unstable system with 6 inputs. Driving forces of 6 rotors are divided into four components such as throttle, roll, pitch and yaw. The control algorithm is simulated with Design Optimization Toolbox in Matlab. After observing the corresponding responses of Euler angles, the altitude and the driving force for each motor, the simulation results show good performance.
Adaptive Outlier-Tolerant Predictors of Controlled Autoregressive Process
Authors: Hu Shao Lin , Yang Yue , Li Meng
Published: June 2013

The controlled autoregressive model is widely used to describe a dynamic process. In this paper, a series of new algorithms are proposed to estimate the models coefficients and to predict future change of the process. On the one hand, it is can be proved that these new algorithms are outlier-tolerant in the case that there are outliers in sampling series. On the one hand, these new algorithms are near to the optimal estimators and predictors separately in normal case.
Driver Modeling and Simulation Based on Improved Preview Follower Algorithm
Authors: Huang Xi Chang
Published: June 2013

Described a driver modelbased on the improved preview follower algorithms.Proposed a new preview-point search algorithm to ensure that the preview point fall on theexpected track and avail on the large curvature road. Considered theimpact of the steady state response to improve the dynamics performance ofdriver model. Modeled and stimulated the driver-vehicle-road closed-loop modelby Dymola. The results indicate thatthe improved driver model perform a high level ofaccuracy on the target track following.
Experimental Image of Pinhole Using CdZnTe Detector
Authors: Shen Min
Published: June 2013

The imaging detector of the nuclear radiation is applied widely in radiation detection, the safety monitor and nuclear medical imaging. We aimed to make scientific researches on nuclear radiant source through the pinhole imaging system .The imaging system was designed that base on the Imarad 16×16 pixel-array CdZnTe semiconductor detector. The detector has high sensitivity to low energy under 200kev at room temperature. We applied the detector and pinhole system to obtain the image of the radiant source that the energy was up 200kev.The detection efficiencies of 38.92 mm×38.92 mm by 5 mm thick CdZnTe pixel-array detector were measured. The capability of the whole system was test and evaluated. The rough image of the radiant source was achieved through the test. When the location of the source and pinhole parameter were changed, the image would vary correspondingly. The accurate image could acquired by means of image reconstruction .So it is feasible that the research about the localization and qualification of the nuclear radiation is making use of the pinhole system.
Research on Driver Design for CMOS Image Sensor Based on DM642
Authors: Yang Ping Xian , Liu Zhen Bao , Jin Tao
Published: June 2013

This paper mainly researches on the TI company fixed-point digital signal processor TMS320DM642 video capture technology for CMOS image sensors, sensor interface and video mini-driver carried out a detailed analysis, established different levels of peripheral structures under different CMOS Sensor, the research in this field has flexible characteristics and high practical value.
The Accurate Calculation Model of Vector Azimuth Based on DTG
Authors: Wang Zhen Ye , Guo Xiao Song , Zhou Zhao Fa , Xue Hai Jian , Qiao Jing
Published: June 2013

The difference between the attitude angle and the rotation angle will cause the modeling error of DTG. The accurate calculation model of azimuth is established according to the relationship between the attitude angle and rotation angle. The error between the accurate calculation model and the traditional model is analyzed by simulating. The simulation show that the modeling error is proportional to the tilt angle and the pitch angle, when the change of the tilt angle and the pitch angle is 1°, the max change of the modeling error will be 3.6701.
A Topology Structure Control Algorithm of Wireless Sensor Network by Using Small World Model
Authors: Song Pan
Published: June 2013

The small world network has higher convergence coefficient and shorter average path length. This paper introduce small world theory to the wireless sensor network, and propose a topology control algorithm of wireless sensor network based on NW small world network model. The design of algorithm is hierarchical, which include formation of super node ring, common node join clusters, maintenance the load balance of common node in cluster, and maintenance the super node ring when super node is failure. The experiment shows that the topology control algorithm has the characteristics of small world network, the network connectivity is good, and the lifetime of wireless sensor network is prolonged.
Multipath Routing Algorithm of Wireless Sensor Networks by Using Trust Model
Authors: Chen Li Quan
Published: June 2013

Multi-path routing is an important routing method for wireless sensor networks, which can ensure the reliability of data transmission, balance the consumption of nodes energy, meet the network service quality, etc. But it cant effectively resist the attacks from malicious node.This paper proposes a secure multipath routing algorithm based on trust model, which can effectively achieve the secure routing of wireless sensor network. The algorithm make trust evaluation for cluster head nodes, and use nodes trust value to measure the reliability of next hop node, then calculate the number of multipath that meet the expected secure requirement, so as to build the trust multipath routing. The simulation results show that the algorithm can effectively reduce the consumption of energy, prolong the lifetime of network, and ensure the routing security of wireless sensor network.
The Energy Consumption Analysis of Optimal Coverage for Freeway Information Monitoring in Wireless Sensor Networks
Authors: Yu Hua Ping , Guo Mei
Published: June 2013

Applications of wireless sensor networks (WSN) in freeway information monitoring are rapidly expanded. The freeway optimal sensing coverage and efficient energy consumption problems are the fundamental requirement for the freeway information monitoring systems based on WSN. This paper firstly surveys the coverage model which is considering the sensing range of sensors and the width of the freeway. And then analyzes the system energy consumption performance based on this coverage model. The result shows that the network lifespan is very bad because the imbalance energy consumption. Therefore, several improved strategies are discussed in detail, which are to balance the energy consumption and prolong the network life span through increasing appropriate sensor nodes on the both sides of freeway and scheduling these redundant nodes to sleep mode.
The Effect of the Toe on the Biped Robot
Authors: Torklarki Seyed Mehdi , Danesh Mohammad
Published: June 2013

Evaluation of 9-DOF biped robots based on designated smooth and stable trajectories with two added toes is a challenging problem that is the focus of this paper. Simultaneously rotation of feet and toes is considered, which allows the robot to walk more efficiently and like a human being. A desired trajectory for the lower body is designed to increase the stability margin. This obtained by fitting proper polynomials at appropriate break points. Then, the upper body motion is planned based on the Zero Moment Point (ZMP) criterion to provide a stable motion for the biped robot. Next, dynamics equations are obtained for both single support phase (SSP) and double support phase (DSP). On the other hand, two biped robots, which one accompanied by toes, are also compared. Simulation results reveal that the biped robots with toes have better stability margin, less power consumption and more vertical reaction force.
The Research of the Affection of Wiring on the Induction Motor Direct Torque Control
Authors: Liu Yan Li , Jia Tao , Cheng Ze
Published: June 2013

The logical choice of stator voltage vector is the key for induction motor direct torque control. This paper proposes a stator voltage vector selection rule based on wiring, according to analyzing the affection caused by the electrical wiring on motor stator voltage amplitude and phase. The rules are tested in direct torque control system. Experimental results show the correctness of the theoretical analysis.
Study of Two Synchronization Mechanisms for Power Electronic Building Blocks Distributed Digital Control Network
Authors: Xie Zhen , Xiao Fei , Bi Chao
Published: June 2013

An important development trend toward power electronic technology was the integration and modularization. A key concept was Power Electronic Building Blocks (PEBB). Converters which were PEBB-based had lots of advantages, such as cost reduced, easy to reconfigure, reliability enhanced and so on. PEBB-based converters wound operation with distributed digital control, and a cascaded ring topology was the dominant solution for communication network. The characteristics of the ring topology determined the synchronization mechanism was a key technology. This paper addressed two synchronization mechanisms for ring topology network, and analyzed the factors which impact the synchronization precision. At last, aimed at the practice application, this paper compared their strongpoint with each other.
Fault-Tolerant Control of High-Speed Trains with Parameter Uncertainty
Authors: Tao Tao , Xu Hong Ze
Published: June 2013

This paper studies the robust fault-tolerant control problem against actuator faults and parameter uncertainty for High-Speed Trains. First, models of actuator faults and parameter uncertainty are presented. Then a robust fault-tolerant tracking controller design method is developed. This method is based on the mixed Linear Matrix Inequalities (LMI)/Lyapunov stability theory. Tracking control examples and simulations are given, and the response curves of the fault system and the system with the fault-tolerant tracking controller are presented.
PC Controlled Turning Tool
Authors: Mikolajczyk Tadeusz , Kamieniecki Lukasz
Published: June 2013

Design of controlled PC turning tool was presented in paper. Tool placed in the guides was driving using the stepper motor and a screw cooperating with the nut joined with tool. To control of the tool was used PC with the motor control interface connected to the LPT port. Mounted in holder tool allows machining shape surface using the universal lathe
On the Controlling of Spherical Ultrasonic Motor
Authors: Ciupitu Liviu , Olaru Adrian , Toyama Shigeki
Published: June 2013

Research team of Prof. Shigeki TOYAMA has developed at Tokyo University of A&T a new type of ultrasonic motor. Its spherical shape confer 2 or 3 degree of freedom in a single joint which makes it suitable for mechatronics field. In order to control the Spherical Ultrasonic Motor a new method by using Hall sensors and a residual magnetic field induced in rotor was implemented. Present paper is dealing with the command and the control of a SUM by using Hall elements and a residual magnetic field induced in rotor. In this way the approach of controlling problem is by using the inverse kinematics and neuronal networks.
Design of PLC Sequential Function Chart Based on IEC61131-3 Standard
Authors: Huang Feng Yun , Hao Pan , Gao Rui Feng
Published: June 2013

According to the requirements of IEC61131-3 standard, the system of Programmable Logic Controller (PLC) using Sequential Function Chart (SFC) as the main programming language is build. Aiming at the requirements of the SFC programming system, the framework of SFC is established, on this basis, a suit of data structure based on Object-Oriented thinking is designed. It describes the data structure of SFC mainly, and in this way, the functions of SFC, including edit, modify and compile, etc, are realized.The syntax check and logic check of SFC are achieved by traveling recursively and iterating the layers of the nested data structure of SFC. After making SFC into intermediate code, eventually the intermediate code is translated into the corresponding object code.
Design of Robust Adaptive Inverse Controller for a Hypersonic Aircraft Based on CMAC Neural Network
Authors: Yao Cong Chao , Wang Xin Min , Zhang Xiao Chen
Published: June 2013

A new control structure based on dynamic inversion (DI) and neural network technology for a class of nonlinear uncertain system is proposed. DI is an effective nonlinear tracking and decoupling control method. However, the performance of the current DI may significantly degrade when internal unmodeled dynamics and external disturbances exist. In this paper, a Cerebellar Model Articulation Controller (CMAC) neural network is used to improve overall system performance of robust tracking control. The algorithm convergence condition is shown. Based on Lyapunov stability theory, all signals are proved to be uniform convergence. Finally, the flight control system of the hypersonic vehicle is designed based on the proposed method and the simulation results demonstrate the excellent performance and robustness of the controllers.
Numerical Simulation of High Frequency Vibration Recovery Enhancement Technology in Low-Permeability Reservoirs
Authors: Xiao Lei , Xiao Guo
Published: June 2013

The purpose of this article is to make a quantitative research on high frequency vibration recoverys advantages over traditional production methods. In this paper, acoustic pressure relation equation was established and a quantitative description about the porous media reservoir and fluid parameters alteration after high frequency vibration effect were attained. Furthermore, a preliminary mathematical model and computer modeling under high frequency vibration effect in low permeability reservoir were developed. This study was successfully applied to simulation of high frequency vibration recovery in a low permeability reservoir in Western China. The result showed that high frequency vibration recovery could stimulate single well production. By comparing with the well actual production history, it shows that this study can accurately simulate production performance of high frequency vibration recovery enhancement technology in low-permeability reservoirs.
Load Frequency Control of Hybrid Power Systems via Active Disturbance Rejection Control (ADRC)
Authors: Guo Qiao Li , Tan Wen
Published: June 2013

This paper studies the load frequency control (LFC) problem for hybrid power system (HPS) with renewable energy technology. The goal is to attenuate the frequency deviation due to changing load demand, fluctuating wind and varying solar radiation. Two typical HPSs are considered in the paper: one with abundant wind energy and the other with solar energy. Active disturbance rejection control (ADRC) method is used to design the load frequency controller. Simulation results show that ADRC provides higher reliability and stability for the studied HPSs than conventional PI control.
Continuous Feedback Control Design for a Class of Singular High-Order Nonlinear Systems
Authors: Sun Cheng , Sun He Xu , Diao Xin Wei
Published: June 2013

nherently nonlinear systems may not be stabilized, even locally by any smooth feedback but continuously stabilizable. This paper studies the design of continuous state feedback controllers for a class of singular high order non-linear systems. A systematic design method which combines backstepping theory with the idea of adding a power integrator is presented for globally stabilizing controllers of this class of systems.
Study of Multiple Quantum Beats in Atomic Wavepackets
Authors: Zhu Chang Jun , Xue Bing , Zhai Xue Jun , He Jun Fang
Published: June 2013

A theoretical model consisting of 5 energy levels in coupled four-wave mixing processes was proposed to analyze the coherent characteristics of atomic wavepackets using perturbative theory. The equations of motions of the density matrix were derived and the third-order density matrix elements were presented. Under the condition that the duration of laser pulses is sufficiently short, the system response was treated as impulse response. Moreover, in the lowest order perturbation theory, the third-order nonlinear polarization was obtained using rotating-wave approximation. The results show that multiple quantum beats are embedded in the coupled four-wave mixing signals, and coherent dynamics of wavepackets can be retrieved from the quantum beat dynamics.
The Design and Simulation of Control System for Electrical Heating
Authors: Xu Guo Sheng
Published: June 2013

In view of the fact that the performance of any conventional PID control can t meet the requirement an electric boiler temperature control system, this paper puts forward a kind of improved algorithm for tuning the PID parameters. an adaptive fuzzy controller with adjusting factor is proposed in this paper. Experimental results illustrate that the adaptive fuzzy PID controller achieved the system performance index. The method of adaptive fuzzy PID control is a ideal method.
Sliding Variable Structure Control for Attitude of Moving-Mass Hypersonic Vehicles
Authors: Wang Yu Kun , Zhang Zhen , Mao Jian Qin
Published: June 2013

The moving-mass hypersonic attitude dynamic model is a strong nonlinear, multivariable, and strong coupling system. Based on the reasonable assumption, a simplified dynamic model is given. According to the time-scale separation theory, a sliding variable structure controller is designed and implemented for the tracking control of angular velocity and angle at the same time. Simulation results demonstrate the effectiveness of controller.
Active Disturbance Rejection Control for Trajectory Tracking of Manipulator Joint with Flexibility and Friction
Authors: Chu Ming , Chen Gang , Huang Fei Jie , Jia Qing Xuan
Published: June 2013

For high-accuracy trajectory tracking of manipulator joint, the more realistic dynamic equations, considering reducer flexibility, nonlinear friction and external disturbance, are established and then decomposed into two subsystems in series. A double closed-loop controller, which is mainly used to compensate the flexibility, is designed by using active disturbance rejection control (ADRC) technology. The extended state observers are applied for real-time observation and compensation of the nonlinear terms. Simulation results indicate that the flexibility and friction are simultaneously overcomed, and the proposed controller can greatly improve the tracking accuracy.
A Damage Model for Prediction of the Open-Hole Strength of Glare Laminates
Authors: Cao Zi Zhen , Zhang Ji Feng , Wan Yun , Xie Yong Gang
Published: June 2013

A three-dimensional progressive damage model is proposed to predict the open-hole tensile strength of Glare laminates. For the glass fiber reinforced epoxy the user subroutine UMAT is employed for description of the failure modes, such as matrix cracking and fiber failure. Behavior of the delamination between plies of the laminate is described using cohesive elements. Laminates with a rhombic hole, a square hole and a circular hole are taken into consideration separately. The results obtained by the present solution approach are validated with those available in the literatures.
Parameter Identification for Nonlinear Electro-Hydraulic Servo System Based on Multi-Particle Swarm Optimization
Authors: Ming Hong Quan , Luo Lei , Wang Zheng Ming , Jiang Ying
Published: June 2013

In the electro-hydraulic servo system for steam turbine, there are many components with nonlinear behaviors. It is difficult to identify these nonlinear parameters with regular identification methods. Particle swarm optimization (PSO) is a relatively new optimization algorithm which has been applied to a variety of problems. However, it may easily get trapped in local optima when solving complex problems. In this study, a nonlinear model including dead zone is established first and a multi-particle swarm optimization (MPSO) method based on double-layer evolution is studied in detail. Then the parameter identification with this optimization method for the electro-hydraulic servo system of steam turbine are discussed in the paper. Moreover, numerical simulation demonstrates that the accuracy of the proposed parameter identification algorithm can be guaranteed.
A New MTSA and its Application for Model Optimization
Authors: Chen Jie , Zhou Ling
Published: June 2013

In this paper, a modified two-step algorithm (MTSA) is applied to an optimization problem in which the objective function is a multi-input single-output nonlinear steady-state model. An on-line searching method for gain-keeping in MTSA is proposed. The simulation results show that the method is effective.
Automated Visual Inspection for Medicines in Aluminum-Plastic Blister Packaging
Authors: Shu Yi Gui , Tang Li Xin
Published: June 2013

This paper presents an automated visual inspection system, which detects defects of medicines including tablets and capsules in Aluminum-plastic blister packaging. The system operates either in training or inspection mode. In training mode, the images of each type defect-free blister pack are used to extract the model. In inspection mode, the type of an inspected blister pack is determined and the defects of the medicines in the blister pack are detected in real-time. In this system, an improved definition of color histogram is adopted to determine the blister pack type correctly, by calculating the distance of the defined color histograms between the inspected image and each model. The eigenvector is designed, which distance could be used to judge the defects of tablet, while the color feature is utilized to detect the defects of capsule. In addition, an effective image skew correction method based on least squares technique is developed. Experiment results show that the system could effectively inspect typical defects of different tablet and capsule.
Comparative Safety Analysis of Different Bollard Supporting Structures
Authors: Zhang Long , Yu Jian Xing , Ma Wei Lin , Wang Bao Jian
Published: June 2013

Detailed finite element analysis has been carried out for different bollard supporting structures by ANSYS software. From the analysis results, it can be seen that the bollard supporting structures are of adequate strength to take the design load transferred from the mooring rope during operation considering the requirement on strength criteria from IACS, and strength check is performed in accordance with the updated relevant ABS standard. Finally, a comparison of these different bollard supporting structures is made to find out their own advantages from safety and other aspects.
Study on Stress and Strain of Anchorage Using Finite Element Method
Authors: Chen Cong Sheng , He Ping , Wang Cheng Yong , Chen Xue Hui , Huang Lei , Lei Jing Fa
Published: June 2013

Three-dimensional integrated modeling method and the numerical simulation of elastoplastic finite element are adopted in the paper. The mechanical response of the five holes anchorage is analyzed in certain prestressed state. The stress and strain distribution information of the anchor ring, clip and steel strand is obtained respectively, and the structure safety is discussed by investigating on the maximum stress and strain.
Free Vibration Analysis of Cracked Composite Beams Subjected to Coupled Bending-Torsion Loads Based on a First Order Beam Theory
Authors: Daneshmehr A.R. , Inman D.J. , Nateghi A.R.
Published: June 2013

In this paper free vibration analysis of cracked composite beams subjected to coupled bending-torsion loads are presented. The composite beam is assumed to have an open edge crack. A first order theory is applied to count for the effect of the shear deformations on natural frequencies as well as the effect of coupling in torsion and bending modes of vibration. Local flexibility matrix is used to obtain the additional boundary conditions of the beam in the crack area. After obtaining the governing equations and boundary conditions, GDQ method is applied to solve the obtained eigenvalue problem. Finally, some numerical results are given to show the efficacy of the method. In addition, to count for the effect of coupling on natural frequencies of the cracked beams, different fiber orientations are assumed and studied.
Analysis on the Application of the VRF Air-Conditioning Compressor in the Field of Freezing and Cold Storage
Authors: Yang Yon Gan , Yang Zhao , Xu Qiu Bo
Published: June 2013

This paper introduces the program that the compound compression is achieved through adopting the grouping ways of the VRF air-conditioning compressor, and draws the conclusion that when using the refrigerant R410a, the compound compression is feasible for the evaporating temperature higher than-36°C. The application of the variable-frequency compressor of the air-conditioner and the method of thermodynamic calculation of the single-stage throttle and incomplete inter-cooling are discussed. For guaranteeing the optimal intermediate pressure and adjusting the volume ratio, to utilize the VRF air-conditioning compressor has strong advantages and good market prospects.
Assessing the Potential Hazardous Incidents in a Steel Refining Plant in the Caribbean
Authors: Reid S. , Ramoutar A. , Riverol C.
Published: June 2013

In all processing plants there is a great influence to improve the performance of its overall operation, safety, efficiency and production by the need to reduce the failure of its equipment. Equipment failure; even on very rare occasions, can result in great economic and financial losses. As a result of many uncertainties originating from the design and operation of the equipment at a plant there are some failure risks that cannot be avoided. In this article, the reliability of a steel refining process was predicted. Two failure modes were investigated for each type of equipment from which the reliabilities were used to determine the overall plant reliability. The maximum plant reliability was found to be 98.0%. It was noted that even though a high reliability prediction was found, it is important to employ preventative maintenance on the plant to ensure the consistent operation of the equipment and maintain the reliability.
Development of Online Monitoring System to Vacuum Pressure of Vacuum Arc Extinguish Chamber
Authors: Hou Chun Guang , Zhang Shi Yu , Cao Yun Dong , Liu Shu Xin
Published: June 2013

The vacuum pressure of vacuum circuit breakers (VCBs) is an important condition to ensure its operational performance, online monitoring of the vacuum pressure of VCBs is an important issue for reducing the accident rate of VCBs and the losses of personnel and property, achieving the intelligence of VCBs. In this paper, 10kV ring network switch cabinet (RNSC) is regarded as the object of study, to achieve its online monitoring. Through analyzing the magnetic field outside the vacuum arc extinguish chambers when the vacuum pressure of VCBs increases, a new method which is based on the comparison of the interphase magnetic field between the corresponding vacuum arc extinguish chambers in RNSCs then monitor the vacuum pressure of VCBs is proposed and demonstrated, and the result established a theoretical basis on the research of the online monitoring system of the vacuum pressure for the vacuum arc extinguish chambers.