bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of RFID Based Robot System for Automatic Search of Books in Libraries
Authors: Li Gang Sheng , Pang Yue Xin , Luo Wei , Zhang Ling
Published: January 2012

In this paper, a novel mobile robot system for searching books automatically in libraries is designed based on the radio frequency identification (RFID) and singlechip programming techniques. Recently, the barcode identification is frequently used in libraries. However, because of its unique advantages of RFID technology and its application in the intelligent robots will be able to achieve high-efficient automatic search of books. RFID has the advantages of large information storage and long identification distance etc., thus application in library management information system has great development potential. By using RFID long-distance identification ability combined with the close accurate positioning technologies, a mobile robot for automatic search of books in libraries is designed, which can effectively improve the book search efficiency, saves the massive cost and improve the library informatization level.
Analysis of Pivotal Technical Standards of Multi-Format Full-HD Camcorder
Authors: Han Zhen Lei , Chang Zheng , Yao Fang Fang
Published: January 2012

Firstly, this paper presents several important technical standards and concepts of multi-format full-HD camcorder. Then it focuses on the application of pulldown theory in HD camcorders, and the meaning of such technical standards as "pA", "pN", "PsF". Finally, it introduces different system mode and recording format. It might be significant in reference and guidance.
Research on the Imaging Technology of 3DTV
Authors: Han Zhen Lei , Li Yan Qun , Yuan Jing
Published: January 2012

From image shooting and recording system, nonlinear editing, parallax adjusting, color grading, live transmitting and broadcasting, Blu–ray ROM discs authorizing to screen display system, 3DTV solution does it all. This paper describes the imaging principles and off-the-screen theory concerning 3DTV, and then analyzes the working principle, advantages and disadvantages of frame sequential display technology based on time-division multiplexing.
The Current Transformer Accuracy On-Line Evaluation System
Authors: Yan Dong , Xie Kai , Wang Yong , Yang Xiao Hui , Ma Fei , Qiao Li Hong
Published: January 2012

The accuracy of current transformer (CT) is important guarantee of power system protection, monitoring and measurement. A new method based on live working technique for CT accuracy evaluation is proposed in this paper. Through constructing standard part, which is on-line insert into power lines, and comparing the data of standard part with the data of the measured part, the system can calculate the ratio error and phase displacement of the measured CT. The results of on-line test have shown that the proposed method is feasible and effective, and the accuracy of proposed system achieves 0.1 grades.
Discuss the Ingenious Application of Mathematics in the Major Essentials Courses “Circuit Analysis”
Authors: Liu Ming Dan , Shen Luo Cheng
Published: January 2012

The course of has a broad engineering background, with rigorous theory and strong logic. This paper discusses the applications and features in the dynamic circuit for the zero-input response, impulse response and step response. Using superposition theory gets the expression result for the impulse response and step response on the basis of zero-input response. And have a detail solution for the typical examples using the knowledge of higher mathematics, focusing on the introduction of the phasor method, Laplace transform to deal with circuit analysis problems. This method has some guiding significance for solving the different circuit.
Summarization of Airship’s Attitude Control and Station-Keeping Control Methods
Authors: Hu Guo Chang , Wu Mei Ping , Zhang Yan
Published: January 2012

As important parts of airship’s control systems, the attitude control and station-keeping control have important effects on the vehicle’s performance. This article discusses the control methods in present usage, which include PID control, robust control, optimization control, sliding mode variable structure control, auto-disturbance rejection control and other control methods. The application areas of the methods are discussed, and the developing direction is pointed at last. Introduction
Fire Alarm Processing Control Systems Based-On Holographic Crystal Topology Structure
Authors: Li Quan Min , Xu Chang Ying , Lv Hong Li , He Jun
Published: January 2012

According the radial flutter extension structure problems in commonly used fire alarm system, a novel topology structure of fire alarm systems based-on holographic crystal forms was proposed. It was composed of multiple devices, including intelligent fire detectors, which can communicate with each other, record fire information and judge, alarms, security, evacuation lights etc. Each device can record all of the information so as to form the hologram. These devices on each floor level in buildings and decorated with vertical layout in the staircase, so that fire alarm system topology based-on holographic crystal forms was set up. The systems can ensure the normal operation of other devices in case that central control equipment failed in extreme cases. And then the automatic fire safety equipment continued to automatically control fire rescue and guide the staff in the correct escape route. Moreover, when a device or a line goes wrong, only failure equipment or system was cut off line, and others were still able to keep communications. Compared with other methods, this new system does not affect the normal equipment of the work.
Application of Passive Seeker/Altimeter in Air Guided Munition’s End-Guidance Phase
Authors: Chu Cun Shan , Shan Jia Yua
Published: January 2012

Inertial navigation system’s position error and velocity error are accumulated over time, it certainly affect the end guidance accuracy of the air munitions. To solve this problem, the information which includes altitude angle, azimuth angle, their angle velocity and altitude provided by passive seeker and altimeter is used for amending INS error with UKF algorithm in end-guidance phase. Through computer simulation the feedback filter with altimeter is better than that without altimeter.
Missile-Borne Radar Data Filtering Algorithm Based on the “Current” Statistical Model
Authors: Li Hui Feng , Li Chao
Published: January 2012

An Extended Kalman Filter (EKF) based on the “current” statistical model is developed for detection of highly maneuvering target using missile-borne Pulse Doppler radar. The online recursive filtering algorithm was also developed to estimate the four dimensional variable: relative distance, velocity, azimuth and elevation angles. Identifying the mean acceleration of maneuvering targets real-timely while estimating the state could improve the tracking performance. Simulation results show that the “current” statistical model based on EKF filtering algorithm is adaptive to high target maneuvering.
A Constant Power Control System for Oilfield Electric Workover Rigs Based on Serial Communication between a PLC and a Converter
Authors: Zhang Bing Yi , Shen Jia Yu
Published: January 2012

A constant power control system based on Serial communication between a programmable logical controller (PLC) and a converter is put forward for high efficiency of oilfield workover rigs and for simple operation and reliability. In the condition of different transformers’ capacity, this system makes the motor always be in constant power state automatically by selecting power limit values. Operators with different practices can make use of this system because of its manual function which meets the demand of humanized design. This system can be used in other lifting equipment whose operation mode is similar to workover rigs.
Research on Cooperative Maintenance Decision System for Power Plant
Authors: Guo Jiang , Wu Mei , Gu Kai Kai , Wang Yi Xin , Zhao Xiang Ping
Published: January 2012

The cooperative maintenance is carried out of China's electric power system, an important research topic, how to achieve wide-area collaboration maintenance decision is one of the forefront research tasks in the maintenance field. In order to solve the knowledge resource sharing and utilization in the plants maintenance field, on the basis of analyzing the current status and needs of the maintenance network, to achieve the object of swarm cooperative maintenance decision-making, we have established the collaborative maintenance decision system, is supported by multi-knowledge, multi-method, multi-resource, multi-information based on knowledge grid, and also have investigated the knowledge modeling approach. Resource nodes open mutually, share resource information and by the unified management and scheduling of the knowledge grid platform, coordination between each other, provide the necessary services for different power plants, manufacturers and research institutes. That is beneficial to enhancing the diagnosis standards and treatment ability of the maintenance decision system, reducing the diagnosis and maintenance costs, and improving the diagnosis efficiency.
LQR Control of Single Inverted Pendulum Based on Square Root Filter
Authors: Wang Hong Mei , Jiang Shi Jin
Published: January 2012

Inverted pendulum system is a nonlinear, coupling, multi-variable and unstable system. In this paper, Linear Quadratic Regulator (LQR) is used to achieve optimal control of single inverted pendulum. First, the state-space model of the system is created. Then state feedback gain is calculated by selecting suitable weight coefficient matrix. Because the inverted pendulum system exists all kinds of disturbs inevitably, the states have errors and the accuracy of control drops. So square root filter is used to estimate states on line before LQR. The simulation results show control effect has obvious improvement because of adopting square root filter.
The Dempster-Shafer Theory Is Uesd in the System of SINS
Authors: Zhang Heng Hao , Meng Xiu Yun , Liu Zao Zhen
Published: January 2012

when the system of SINS is working, the calculational process can cause the accumulated error. So we use the Dempster-Shafer Theory to establish one belief space which can choose the better data to use in the next step. So we can minish the accumulated error and improve the system’s precision. After we use the Dempster-Shafer Theory in the algorithm which is used in the system of SINS, we can find the improved algorithm can minishi the calculational error which is caused by the compute of system. At last we can improve the precision of system.
Remote Wireless Network Monitoring Application System
Authors: Fu Hui , Jin Bin , Han Lin , Tao Zuo Tang
Published: January 2012

With computer technology, communication technology and the rapid development of electronic technology, remote monitoring technology will be more widely used for data transmission requirements and more stringent. GPRS-based remote monitoring system, which is based in communications equipment, through the server to PC, as the remote control platform, embedded applications, network programming and other technology, the remote information display and control. Throughout the system, users can allow each terminal in the case of permission to accept the data on the changes and settings. Wireless network communication is important that the network transmission of data security and consistency, to solve this problem this thesis, performance of network communications software technology to achieve self-monitoring and self-recovery, while use of end to end encryption to encrypt data on the transmission , which can guarantee data reliability, completeness, real time and security.
The Study of the Trust-Role Based Access Control
Authors: Gao Zhong Wen , Zhang Ming Sheng
Published: January 2012

In light of the problem of the security of Peer-to-Peer networks, an access control method is proposed which is based on the trust relationship between the peers in this paper. Thus the peers of different trust values can get different access authorities.
Study on Wind Resistance of Suspension Bridge with Composite Beam
Authors: Ning Xiao Jun , Zhao Qiang
Published: January 2012

It is very important that how to improve wind resistance of bridge when design suspension bridge. In this thesis, main wind disaster of suspension bridges is recommended, and summarizes the historical lessons. For the particularity of suspension bridge with composite beam, some suggestions on how to heighten flutter wind speed are suggested.
Application of Substructure Discovery Based PSO Algorithm in Distribution Network Economic Evaluation
Authors: Zhang Xiao Hui , Lu Zhi Gang
Published: January 2012

In this paper, a hierarchical economic evaluation index system for distribution network is established. The various indicators of the distribution network and the correlation between the distribution network in order to form is proposed. Substructure discovery algorithm is used to data mining. To avoid falling into local optimum, efficient global search capability of particle swarm is applied to substructure algorithm optimization. Finally, an example demonstrates the reasonablity and effectivity of the substructure found algorithm applied into distribution network economic evaluation. Optimization speed with particle swarm algorithm is fast. This study have practical significance to network planning.
Stabilization of Networked Control Systems with Uncertain Parameters
Authors: Jin Fang
Published: January 2012

This paper addresses the problem of stabilizing linear continuous-time systems with uncertain parameters, where sensors, controllers and plants are connected by a digital communication channel. A necessary and sufficient condition for stabilization of linear uncertain systems is derived. The method to be proposed here relies on linear matrix inequalities. Simulation results show the validity of the proposed scheme.
Dynamic Output Feedback Control with a Preview of Disturbance
Authors: Liu Qing Quan
Published: January 2012

This paper addresses the dynamic output feedback stabilization problem for linear time-invariant systems where the process disturbance preview is available to the controller via communication networks. A lower bound of data rates of communication channels, above which there exists a feedback control policy to stabilize the unstable plant with unbounded disturbance, is presented. Furthermore, the problem of bandwidth allocation in the communication channel is analyzed based on the system dynamics. Simulation results show the validity of the proposed scheme.
Discussion on Operation Mode of Long Distances Gravity-Fed Pressure Diversion Project
Authors: Zhu Man Lin , Zhang Yan He , Wang Tao
Published: January 2012

The characteristics of long distance gravity-fed pressure water-conveying projects are long pipe length, huge changes in rise and down of pipeline arrangement, and complex hydraulic conditions. It is the water hammer that mainly influences the safe operation of such projects. Based on a real long distance gravity-fed pressure water conveying pipeline system, fluid transients processes under different operation modes were analyzed by using the method of characteristics. The pipeline longitudinal arrangement is high in two ends and low in the middle part. The research puts forward that for such pipeline arrangement using valve set in the midway of the pipeline to control the system is evidently better than that of valve at the downstream end of pipeline. In this way, pipeline working pressure can be effectively reduced, in turn, the pipe pressure grade can be decreased and the investment of the project can be reduced.
Synchronized Control of Dual Linear Motors Position Servo System Based on Multi-Axes Motion Control Card
Authors: Ying Cheng , Qin Hai Chen , Quan Jian Zhou
Published: January 2012

This paper introduces a position synchronized control strategy to deal with the synchronous error caused by the external disturbance in dual linear motors servo system. In order to achieve satisfactory results, a new control scheme combing feedforward control, feedback control and cross-coupled control is proposed and makes progress in decreasing the synchronous error which was shown by the experiment.
Thermal Deformation Finite Element Analysis for the Ram of Heavy-Duty CNC Machine Tools
Authors: Lu Yong , Cui Gang Wei , Gao Dong , Xiang Heng Chao
Published: January 2012

The thermal deformation of ram system in a heavy-duty CNC milling-boring machine tool has a serious effect on its accurateness. This paper analyses quantificationally the temperature field and deformation field of the ram system, and gives the ram’s heat sources, calculating quantity of heat and transferring type of heat. And then a finite element analysis is performed, the analyzing results provide basic theoretical data for thermal error compensation in machine tools.
A New Method for Online Assessment of Voltage Stability
Authors: Innah Herbert , Hiyama Takashi
Published: January 2012

In this paper we proposed a new technique for identifying system stress due to the loading in wide area of power system based on the phasor angle difference behavior. The difference of voltage phasor angle between busses can be transferred in to a simple conversion and trigonometric wave signal during load increasing. Using Discrete Fourier Transform (DFT), the signal will be transformed into the spectral frequency. The proposed technique will analyzed current condition by visualized the level of stress and proximity to voltage stability limit in the system based on the change of spectral frequency . This method also can be used to monitor such loss of generators or transmission line outages. The result shown that the proposed technique is simple, fast and reliable, requiring minimum data measurement and be suitable for Wide Area Monitoring System.
Voltage Coordination via Communication in Large-Scale Multi-Area Power Systems. Part II: Simulation Results
Authors: Moradzadeh Mohammad , Boel René
Published: January 2012

This two-part paper deals with the coordination of the control actions in a network of many interacting components, where each component is controlled by independent control agents. As a case study we consider voltage control in large electric power systems where ever-increasing pressures from the liberalization and globalization of the electricity market has led to partitioning the power system into multiple areas each operated by an independent Transmission System Operator (TSO). Coordination of local control actions taken by those TSOs is a very challenging problem as poorly coordinated operation of TSOs may endanger the power system security by increasing the risk of blackouts. This second part of the paper presents simulation results on a 12-bus 3-area test system, using the distributed model predictive control paradigm in order to design a coordinating model-based feedback controller. Coordination requires that each agent has some information on what the future evolution of its power flows to and from its neighbors will be. It will be shown that how the communication between agents can avoid voltage collapse in circumstances where classical uncoordinated controllers fail.
High Performance Arbitrary Amplitude and Phase of Voltage Sags and Swells Generator with Series Injected Inverter by d-, q-Axis Controlled
Authors: Tawanwongsri Phongphat , Neammanee Bunlung
Published: January 2012

Voltage sags and swells are the most common types of power quality disturbances. Often, voltage sags and swells caused by electrical fault in the power system. This allows devices that are installed in the power system damage. Therefore, we have generated voltage sags and swells to simulate events that occur in power systems for virtual reality. In this paper, voltage sags and swells generator (SSG) using the principles by d-, q-axis can be arbitrary control of the magnitude and phase of the injection voltage. The simulation results can confirm, the SSG can generate the arbitrary voltage sags/swells with in phase, phase lead or phase lag.
A 5kW Zero Voltage Switch Space Vector Modulation (ZVS-SVM) Controlled Three-Phase Boost Converter
Authors: Panprasert Decha , Sadara Wara , Neammanee Bunlung
Published: January 2012

This paper proposes a 5kW zero voltage switch space vector modulation (ZVS-SVM) controlled three-phase boost converter. A power circuit of this converter is modified from the conventional three phase boost rectify by combine the active clamp branch. A branch composed of an active switch, a resonant inductor and a clamping capacitor. By used the control techniques to active clamp, the ZVS are occurring at the power switching components. The simulation results can confirm the superiority of this topology to increase the system efficiency up 98 percent. The system has fast response, low total harmonic distortion and steady state error with unity power factor. Moreover, both the main and the auxiliary switches have the same and fixed switching frequency.
Low Power Design of near Shannon Limit Coding: Turbo Codes
Authors: Maity Niladri Pratap , Maity Reshmi
Published: January 2012

In this paper secure channel coding schemes based on Turbo Codes are suggested and implemented. The design of encoder using Recursive Systematic Code (RSC) with puncturing techniques is presented. Component decoders are implemented by Log-Maximum-a-Posteriori (Log-MAP) algorithm and thereafter implementation of overall turbo decoder is illustrated in detail. Finally we have investigated low power design technique of the turbo decoder design with variable iteration techniques.
A Method for Distinguishing the Effective Fractures in Fractured-Vuggy Reservoirs
Authors: Li Hong Kai , Kang Zhi Hong
Published: January 2012

In this paper, a combination of static and dynamic methods was used to identify effective fracture in Fractured-vuggy reservoir. An initial fracture model was established through the fuzzy neural network (FNN) and ant-tracking algorithm based on the static data (log and seismic data). We analysis the intel-well connectity and identify effective fracture based on dynamic data by pseudo-interfered well test， and then modify the fracture model. The application of this method solved the effective fracture identification problem of S48 unit .The fracture model got good result in numerical simulation.
Technical and Economical Evaluation of Media and Fog Systems in Fars, Qom, Yazd, Shahid Rajaee Power Plants
Authors: Mehraban Karim Maghsoudi , Jezeh Seyyed Vahid Mahmoodi , Kazemi Seyyed Hossein Musa
Published: January 2012

In the hot days of summer, the efficiency of gas turbine is extremely reduced because the input air to compressors becomes hot. For solving this problem, one can increase the efficiency of the power house by charging to decrease the input air temperature to the compressor of gas turbine. In this paper, all kinds of cooling the inlet air to the gas turbine are introduced and then the technical and economical evaluation of these installed cooling system in Shahid Rajaee, Qom, Fars and Yazd power plants are expressed and the results show that the fog system cannot prove its effectiveness in Shahid Rajaee and Qom power plants. Whereas the installation of media systems in Fars combined cycle power plant produces more megawatt than its guarantee conditions and no particular problem has been observed.
Diagnosis for Engine Misfire Fault Based on Torsional Vibration and Neural-Network Analysis
Authors: Du Can Yi , Ding Kang , Yang Zhi Jian , Yang Cui Li
Published: January 2012

Misfire is a common fault which affects the engine performances. Because the signal-to-noise ratio of torsional vibration signal is high, torsional vibration test and analysis for the engine were performed in a variety of operating conditions, including healthy condition and single-cylinder misfire condition. In order to improve the accuracy of analysis, energy centrobaric correction method was used to correct the amplitude. Taking the corrected amplitude of main order as the fault feature, and then a BP neural-network diagnostic model can be established for misfire diagnosis. The result shows that the method of combining torsional vibration signal analysis and neural-network can diagnose engine misfire fault correctly.
Vector Control Study for Cascade Brushless Doubly-Fed Machine
Authors: Wang Zheng , Yang Mo Yong
Published: January 2012

In this paper, the structure and principle of the cascade brushless doubly-fed machine are introduced and the mathematical model under rotor reference frame(d-q axis) is derived.The validity of the model has been verified by numerical simulation ,which provides the theoretical foundation for the study of control strategy and its implementation of this kind of machine in future.
Single Phase Detection of Voltage Sag Based on Instantaneous Reactive Power Theory
Authors: Zhang Hui Zhi , Li Yong Li , Li Bo Tong , Zhang Shuo , Tan Zhen
Published: January 2012

Voltage sag is one of the most frequent and serious dynamic problems that impact the power quality. To solve this problem, fast and precise detection of the voltage sag is needed. A detection method is presented in this paper, using single phase voltage information, to be applied in the typical condition of unsymmetrical three-phase voltage sag. This method adopts fast recognition of voltage disturbance and SPLL. Finally, MATLAB simulation has been used to verify the effectiveness of the method.
Discrimination of Three-Phase Three-Limb Transformer Inrush Current Based on Characteristics of Instantaneous Excitation Inductances
Authors: Jiale Suo Nan , Xu Li Qiang , Jiao Zai Bin , Du Bin
Published: January 2012

Existing methods utilizing excitation inductances to discriminate inrush current and internal fault of transformer are all derived from the singe-phase transformer circuit model, yet there are no discussions considering the widely used three-phase three-limb transformers. In view of this question, the mathematical model of three-phase three-limb transformer based on the characteristics of its magnetic equivalent circuit is established, through which the excitation inductances of the three-phase three-limb transformer can be calculated. The calculated excitation inductances have definite physical meanings and can reflect the saturation state of the transformer core under inrush condition. Analysis of the circuit model demonstrates that the delta circulating current is not the excitation current of three-phase three-limb transformer, so the proposed method can be used to the transformers with delta connection directly. The proposed method has been verified by electromagnetic transients program including direct current (EMTDC) simulations, simulation results show that the calculated excitation inductances have different characteristics under inrush and internal fault conditions, and can be applied to identify the inrush current of three-phase three-limb transformer.
Improvement in Dynamic Performance of Indirect Current Control Strategy on Three Phase PWM Rectifier
Authors: Wang Xiao Chen , Yang Jiang Ming , Li Hong Mei , Sun Feng Xiang
Published: January 2012

Three phase voltage source PWM rectifier (VSR)’s indirect current control (ICC) strategy has good static performance, simple control steps and low cost. But bad dynamic performance is its inherent drawback. If this weakness is overcome, it is still valued. In this article normal ICC is deeply studied beginning with its mathematical model under synchronous rotating coordinate. It is indicated that its bad dynamic performance originates from bad current response. So an improving scheme adding compensation in series is brought out. Additionally a differential negative feedback loop of DC output voltage is added to limit the voltage overshoot. Lastly the control system’s computer simulation model is established by MATLAB and the simulating results prove that improved ICC makes great process in dynamic performance and has advantages of both indirect and direct current control (DCC).
Research on Very Fast Transient over-Voltages Distribution in Large Power Transformer Windings
Authors: Gao You Hua , Lai Zeng Feng , Liu Xiao Ming , Liu Guo Wei , Wang Ye
Published: January 2012

To analyze the transient response of transformer windings under very fast transient over-voltage (VFTO), multi-conductor transmission line (MTL) model based on the representation of transformer windings by its individual turns are established. Space discretization is needed for solving the time-domain telegraph equations of MTL. To calculate the voltage distributions along transformer windings, through combining the compact finite difference (CFD) theory and the backward differentiation formulas (BDF). Simulation software ATP is introduced, and the simulation results demonstrate that the proposed approach is feasible.
Influence on the Excited Converter Capacity of Variable Speed Dual Stator-Winding Induction Generator System by Excited Capacitor
Authors: Shi Xian Jun , Liu Ling Shun , Wang Zhen
Published: January 2012

Excited capacitor of power winding has much influence on the capacity of excited converter of dual-winding induction generator. The capacity of excited converter can be optimized by changing the excited capacitor. The influence law of the capacity of excited converter by variable excited capacitor are compared under variable speed and variable load recured to simulation methods.
Research on Modify Proportion-Integration Control Strategy of Three-Phase Four-Leg Inverter
Authors: Min Jing Yan , Chen Hong Bing
Published: January 2012

A general PI control algorithm is not a perfect solution to control ac signal. Because it is not able to eliminated steady-state error. The radical reason of the problem is investigated in few literatures. So the reason is explored, and an important conclusion is reached. The conclusion is that zero steady-state error control is obtained when the control algorithm has infinite gain at the excited frequency. Based on this conclusion, a modified PI algorithm is proposed for a four-leg inverter. The method that parameters of the modified PI algorithm are defined is given. To control the component in the 0 axis, the virtual component leading the component in the 0 axis by 90 degree is constructed. So the unified control algorithm is implemented in reference frame. The effectiveness of the proposed algorithm has been investigated and verified through simulation.
Analysis to Coupled Electromagnetic-Thermal Field of Brushless Doubly Fed Machine
Authors: Xia Sheng Zhu , Deng Xian Ming , Wang Zhi Ye , Liu Meng
Published: January 2012

this paper build up the brushless doubly fed machine (BDFM) finite element model of the coupled electromagnetic-thermal field, the electromagnetic joule heat calculated in electromagnetic environment will be loaded as the heat source to calculate in thermal field, the calculated results in thermal field will be the initial conditions to calculate the electromagnetic field, get the thermal field distribution when the motor is stable through cycle calculation at last. Calculation results show the effectiveness of this method.
Development Review of Drive Motor Applied in Electric Vehicle
Authors: Zhang Xue Yi , Zhang Qing Xiang , Shi Li Wei
Published: January 2012

Motor is one of the cores of electric vehicle, the performances of motor directly impact the performances of electric vehicle. The development of drive motor applied in electric vehicle is reviewed, the advantages and defects of several kinds of the motor developed in recent years are summarized, and the applications of control strategy too. The development of permanent magne brushless motors is prospected.
Chaos Anticontrol Problems for a Nonlinear Circuit System
Authors: Su Cheng , Huang Zhi Dan , Lei Kai Ming
Published: January 2012

A third-order circuit system with nonlinear negative capacitance is studied. The dynamical equation and state equation of the system are established. By the phase portraits, the motions of the system are studied under the definite parameters. And by bifurcation diagram, the route from periodic motion to chaos is studied under the presented system parameters. Two anticontrol methods is used to control the periodic motion of the system to chaos. The phase plane portraits and bifurcation diagram of the anticontrolled system are obtained. The threshold values of the anticontrol values of the two control method are obtained. The advantages of the two anticontrolled methods are that the collect of the control signals are simple and can put on any time and the periodic system can be asymptotically chaotic with small control. The orbits of the system can be anticontrolled by these two methods according to our target
Chaos and its Controlling Problems for a Nonlinear Circuit System
Authors: Zhu Ling Yun , Gou Xiang Feng , Chen Quan Lei
Published: January 2012

The complex dynamics characters of a third-order circuit system with nonlinear negative capacitance are studied. The dynamical equation and the state equation of the system are established. By the phase portraits, the motions of the system are studied under the definite parameters. And by bifurcation diagram, the route from periodic motion to chaos is studied under the presented system parameters. Two feedback methods are used to control the chaos of the circuit system. One is an adaptive method and the other is the feedback of states and parameter adjustment method. The phase plane portraits and bifurcation diagram of the controlled system are obtained. The advantages of the two controlled methods are that the collect of the control signals are simple and can put on any time and the chaotic system can be asymptotically stabilized to equilibriums with small control. The orbits of the system can be controlled by these two methods according to our target.
Application of Java Serialization into JADE Agent Communication
Authors: Yu Wei Hong
Published: January 2012

Open systems consist of autonomous and heterogeneous agents who interact in order to exchange or negotiate information, knowledge, and services. The principal challenge in agent communication research is to enable flexible and efficient communication among agents. Jade follows FIPA standards so that ideally Jade agents could interact with agents written in other languages and running on other platforms. From the view of message content, there are three ways to implement communication between agents. This paper mainly did some research on how to implement communication between Jade agents using serialized Java objects. Serialization is Java's built-in mechanism for transforming an object graph into a series of bytes, which can then be sent over the network or stored in a file. The research relies on the Project Supported by Innovative Research Team in University of LiaoNing Province: Maritime search and rescue decision support system based on multi-agent. The results show that in a distributed network programming, particularly for transmitting complex objects in multi-agent systems, the use of object serialization is very flexible. But it is also very limited. It must store and retrieve the entire object graph at once, making it unsuitable for dealing with large amounts of data.
Amplifier Bias Stability Design on Output Range Temp. Coefficient
Authors: Yuan Zeng Min , Yuan Xu Jin
Published: January 2012

The limitations of empiric design methods for amplifier biasing stability were pointed out. Critical bias and output range of voltage divider biasing amplifier were discussed. The relationship between bias temperature coefficient and β temperature coefficient was discussed as well. The ratio of bias temperature coefficient to β temperature coefficient is defined as effecting factor. Amplifier bias stability is designed based on output range temperature coefficient. The methods for designing base biasing resistance of voltage divider biasing amplifier on the basis of output range temperature coefficient and for analyzing biasing stability of this amplifier are introduced.
Investigation of Switching Transients between Operation Modes for Inverter-Based Microgrid
Authors: Wang Yan Ting , Zheng Jing Hong , Wang Xiao Yu , Zhu Shou Zhen , Zhu Hong Bo
Published: January 2012

This paper investigates the characteristics of the switching transients between the grid-connected and the autonomous modes for an inverter-based microgrid. The impact of the microgrid components including system line, load and inverter controller on the switching transients is analyzed through electromagnetic transient simulations. A soft switching scheme is also proposed in this paper to improve the microgrid switching performance.
Adaptive Fuzzy Sliding-Mode Control Based on Generalized T-S Fuzzy Model
Authors: Zhong Bin , Zhao Xiao Qing
Published: January 2012

In order to obtain the controlled object’s better tracking performance within the reference signals’ boundary region, an adaptive fuzzy sliding-mode controller is designed aiming at the uncertain second-order nonlinear system. After taking account of the control sensitivity’s requirement for the membership function, the controller capitalizes on the generalized membership function’s adaptability of the generalized T-S fuzzy model without the supervisory control and boundary control that may compensate the system’s modeling error. So, the generalized T-S fuzzy logic system can better approximate to the controlled object and effectively decrease the tracking error within the reference signals’ boundary region. Using Lyapunove’s stability theory, it is proved that the control system is stable. Simulation results show that the design of the controller is reasonable and available.
Study on Sliding Mode Control with RBF Network for DSTATCOM
Authors: Liu Jian Hua , Li Gang , Ma Cao Yuan , Chen Cheng , Zhao Chen
Published: January 2012

For the problems of parameters disturbance, nonlinear and uncertainty of distribution static compensator (DSTATCOM), this paper studies on sliding mode control based on radial basis function (RBF) network. The fast tracking of DSTATCOM reactive current is achieved by using of RBF neural networks and equivalent sliding mode control. The method has a strong adaptability and robustness for load disturbances and system parameters change, and integrates the advantages of neural network and sliding mode control, so it is an ideal intelligent control strategy .The MATLAB simulation results show that the controller has good dynamic and static quality, and provides an effective way for improving the performance of DSTATCOM.
Sliding Mode Variable Structural Control of Nonlinear Inverted Pendulum
Authors: Sun Jian Zhong , Lu Jian Kang , Yang Bin , Li Jun Li
Published: January 2012

In this paper, the multi-input linear and nonlinear mathematical differential equations of inverted pendulum system were established based on the traditional single-input linear inverted pendulum. Aiming at multi-input nonlinear model, nonlinear state transformation are carried through on the basis of the test of distribution involution and the calculation of integral manifold, then, the multi-input nonlinear inverted pendulum system was transformed into two single-input nonlinear inverted pendulum system to study. In the end, make use of related nonlinear system control theory of the sliding mode variable structure, designed the controller structure.
Controlling of Traffic Lights Using RFID Technology and Neural Network
Authors: Mohammadi Sasan , Rajabi Abolfazl , Tavassoli Mostafa
Published: January 2012

In this paper, the new technology of RDIF (Radio Frequency Identification) has been used in order to identify vehicles and also 3 significant parameters including the average speed of vehicles at any side of access point, the average time for waiting and the queue length. They have been used based on the data from neural network for making the best decision throughout the process of finding out duration of the cycle and percentage of green time for each of the access point. Implementation of this system is possible in the shortest time and it has a better function in any kind of weather condition, time or place compared to similar systems.
Gantry Mobile Machining Center Magnetic Suspension System Fuzzy Synchronization Control Based on Disturbance Observer
Authors: Liu Chun Fang , Xing Yin Long , Wang Tong
Published: January 2012

For gantry CNC Machining Center Gantry suspension system, adopting a method of fuzzy synchronization controller and disturbance observer combined control strategy. The disturbance observer Robust feedback controller design compensate the disturbance caused by cutting the time, un-modeled dynamics, system parameter changes, ensure the robustness of a single suspension system. In order to further suppress the gantry beams carrying knife leaning, on the double suspension synchronization system uses fuzzy synchronization control strategy, the two systems through the design of the regulating role of fuzzy controller, and further to overcome suspension height deviation of the double suspension systems, to achieve synchronized suspension purposes. Simulation results show that the proposed control scheme in ensuring the system to achieve stability synchronization suspension, but also has strong robustness, dynamic process synchronization error is small, allowing to meet high accuracy requirements of the controlled objects.
Thermal-Structure Coupled Field Analysis of a Certain HPD Diesel Engine Cylinder Liner
Authors: Lv Jian Ming , Ouyang Guang Yao , Zhang Ping
Published: January 2012

Based on heat transfer theory and thermal-structure coupled in sequence method of finite element, the stress and displacement distribution of a certain high power density diesel engine cylinder liner under the action of thermal-structure coupled loads was calculated. The results showed that the highest temperature field of cylinder liner appeared on the upper part of the cylinder liner inner surface. Furthermore, the maximum stress value and displacement value of cylinder liner were obtained, which will give a gist for designing and calibrating cylinder liner in practical.
High Accuracy Multi-Channel SPWM Generator Based on Digital Natural Sampling
Authors: Wang Xiang Zhong , Zhu Jun Jie , Feng Xu , Chen Cheng
Published: January 2012

Principle of triangle carrier amplitude modulation is equivalent with sinusoidal modulator amplitude modulation, and principle of sinusoidal modulator phase-shifting is equivalent with the triangle carrier phase-shifting are proposed. A digital natural sampling based on multi-channel SPWM generator is developed using time-division multiplexed access (TDMA). Flip time computation by CPU is no needed in the generator which has an accuracy flip time. Design principle and implementation based on FPGA are introduced, and testing results are presented.
Research on Oil well Remote Monitor System Based on Beidou Satellite Technology and LabVIEW
Authors: Fang Qi Zhi , Zhao Jian Min , Sun Yan Peng
Published: January 2012

The distribution of oil Wells is mainly in the field or by sea, most of the oil Wells are using human inspectors for condition monitoring, the problems of this are low efficiency and lack of real-time monitoring. Nevertheless, the problems can be solved by introducing Beidou satellite data reporting system, with the installation of RTU on each oil Well, the pressure, temperature, beam-pumping unit load and displacement data will be sent to the data monitoring center in the oil field. The monitoring software makes a full use of the LabVIEW’s data flow driven language features and operation control technology, along with the use of serial communication technology to achieve the long-distance data acquisition of the beam-pumping, therefore, not only that operation data of oil wells are gained promptly and having safety under control, but also greatly improve efficiency and reliability of oil wells’ condition monitoring.
Design of the Wireless Power Acquisition Node Based on the LONWORKS and ZIGBEE Technology
Authors: Chen Xu Peng , Jiang Xiu
Published: January 2012

ZIGBEE and LONWORKS related technologies are the current research focus in the area of the communication, and it plays a great part in the development of the intelligent building. At the same time, how to collect the power parameter accurately is in urgent need in the intelligent building. We take the CC2430 of the TI Corporation as the host processor, the Neuron 3150 of the Echelon Corporation as the coprocessor to build the communication system, and use the ATT7022 chip to collect power parameters, so we can control and monitor the power through this communication system.
Introduction of a Novel and Powerful Optimization Method Using Genetic Algorithm and Finite Element Method
Authors: Karimi Payam , Shadlou Shahin , Nazari Bahare
Published: January 2012

Optimizing the complicated engineering structures has always been a huge issue. A technique for the design optimization of different components is presented using genetic algorithm and finite element method. To reduce the runtime and increase the efficiently of proposed model a new method of coupling is presented. In addition, two different problems were solved using the presented model and the results showed a great and fast convergence.
Fuzzy Asymmetric Support Vector Machines
Authors: Kong Rui , Wang Qiong , Hu Gu Yu , Pan Zhi Song
Published: January 2012

Support Vector Machines (SVM) has been extensively studied and has shown remarkable success in many applications. However the success of SVM is very limited when it is applied to the problem of learning from imbalanced datasets in which negative instances heavily outnumber the positive instances (e.g. in medical diagnosis and detecting credit card fraud). In this paper, we propose the fuzzy asymmetric algorithm to augment SVMs to deal with imbalanced training-data problems, called FASVM, which is based on fuzzy memberships, combined with different error costs (DEC) algorithm. We compare the performance of our algorithm against these two algorithms, along with different error costs and regular SVM and show that our algorithm outperforms all of them.
Unfragile Control of Uncertain State-Delay Sampled-Data System
Authors: Wang Xue Liang
Published: January 2012

The unfragile control problem of a class of uncertain state-delay sampled system is discussed. Applying Lyapunov method, and combining the properties of matrix inequality, the sufficient condition of robust stability is given, and the unfragile controller is designed. Finally a numerical example illustrates the effectiveness and the availability for the design.
Influence of Main Insulation Thermal Aging on Stator Temperature Field in Large Turbo-Generator
Authors: Li Wei Li , Wu Zhen Xing , Huo Fei Yang
Published: January 2012

The eddy current loss of stator strands in the in-phase slot and out-phase slot was calculated by the finite element method (FEM). 3D static heat transfer equations and equivalent variation equations of large turbo-generator under the Cartesian coordinates system were given. The stator temperature field of large turbo-generator was calculated by using 3D FEM, and the influence of thermal conductivity reduced due to main insulation aging both in in-phase slot and out-phase slot on the stator was analyzed. The obtained conclusions will provide theoretical basis for fault prediction and fault diagnosis.
Rapid Extraction and Compression of DICOM Data for Medical Image Geometric Modeling
Authors: Huang Xue Mei , Wang Jin Chuan
Published: January 2012

This paper presents a method of extracting and compressing required data from the DCM file for medical image geometric modeling. According to the characteristics of DICOM data, combining the idea of run-length coding with block coding, the rapid data compression and storage in RAM was realized finally. Compared with other coding methods, the encoding approach for DICOM data in this paper, not only saves the memory space and improves transmission efficiency, but also can read the required a single pixel, or part of pixel data from the compressed data conveniently.