bluuebunny/crossref_metadata_2025 huggingface dataset:
Configurable Node of Sensor Network for Smart Grid
Authors: Hu Zheng Wei , Xie Rong Yuan , Xie Zhi Yuan
Published: March 2015

In order to support characters of data acquisition system of smart grid, such as scalable and plug and play, one configurable node of sensor network was proposed. The number of protocol standard, the number of interface of each protocol standard, the number of senor of each interface and the number of byte of each sensor can be configured in this node. All these parameters can be configured according to the specific application of smart grid and then achieve the best balance between cost and performance. One real model was implemented by VHDL and the number of protocol standard, the number of interface of each protocol standard, the number of sensor of each interface, the number of byte of each sensor can be configured in the range from 1 to 8. The correctness and validity of this real model were confirmed by simulation results of configurable level and one application instance.
Practical Method for ECG Classification Using Weighted ELM
Authors: Liu Hui , Jin Xin Yu , Li Lan Juan
Published: March 2015

Automatic detection of electrocardiogram (ECG) plays an important role in reducing pressure of nursing patients with heart disease. There have been many studies about ECG classification,which mostly based on machine learning, such as neural networks, extreme learning machine (ELM), and have reached a high accuracy. But it remains to be improved when applied in practice. In this paper, we propose a more practical method, namely the weighted ELM algorithm,which has better time performance and better generalization capability than traditional machine learning method. In particular,classification models trained by this method have better decision-boundary when faced with the imbalance ECG samples.
Ultrasonic Detection Apparatus for Scanning 3D Objects
Authors: Rybakov Evgeny A. , Starikov Dmitry P. , Berchuk Denis Y.
Published: March 2015

This article contains information about creating special unit for scanning 3D objects. The main part of the unit is ultrasonic transducer, which is sends the sound wave to the object and receive back wave for calculating distance. After that, microcontroller send to PC data, and computer program create model for printing from the plastic etc.
Research on Energy Consumption Test and Data Process Method of Gravure Printing Machine
Authors: Bai Jian Jun , Wang Yi Ming , Yuan Ying Cai
Published: March 2015

In order to achieve high-speed gravure printing machine energy consumption tested and analyzed process efficiently, put forward a kind of electric energy balance test and analysis method, using power analyzer acquire and record the electric energy balance parameters of motors input ports of the three-phase power supply, and processing the data with the method of successive difference. By means of experiment, tested and analyzed the main motor energy consumption of gravure printing machine, the results verify the feasibility of electric energy balance test method and the method of successive difference.
Fault Diagnosis of AUV’s Thrusters Based on SVM
Authors: Wan Lei , Zhang Ying Hao , Sun Yu Shan , Li Yue Ming
Published: March 2015

An autonomous underwater vehicle (AUV) should have the ability of adapting the complexity and unpredictability of the marine environment, which means that the technology of AUV’s fault diagnosis is very significant, especially the part of thrusters. In order to make it possible, one fault diagnosis strategy of AUV’s thrusters is proposed, which is based on the support vector machine (SVM). SVM has many unique advantages in solving small-sample, nonlinear and high dimensional problems. In this paper, different character signal is inputted SVM to train and test it. The simulation results show that the fault diagnosis of AUV’s thrusters based on offline SVM can classify the fault styles successfully, which proves its feasibility and effectiveness. This method offers a new way to solve the fault diagnosis of AUVs.
Research on the Collision Detection Technology of Coal-Cutting Machinery in Remote Virtual Control
Authors: Qi Ai Ling , Wang Huan , Wu Hai Yan , Ma Hong Wei
Published: March 2015

On account of the dangerousness of coal mining, the remote virtual control of coal-cutting machinery is the development direction of coal mine automation, and collision detection is a crucial technology of virtual reality system. In order to solve the problems about through the wall during virtual scene walkthrough in virtual control of coal-cutting machinery, this paper has researched collision detection algorithm, according to the characteristics of coalface and virtual reality system scene, taking advantage of hierarchical bounding volumes algorithm to solve the collision detection problems of coalface in virtual reality system. And it has compiled the algorithm by applying SDK of Quest3D software. Research results show that, realization of the collision detection algorithm has solved scene roaming simulation degree and the speed of the system in coalface virtual scene walkthrough.
Full-Field Displacement and Strain Measurement: Application of Digital Image Correlation to Reinforcement Corrosion Induced Concrete Fracture and Cover Cracking
Authors: Li Qiang , Yu Hong Fa , Tong Jing
Published: March 2015

Cracking of the cover concrete due to steel corrosion is considered as one of the major issues of durability of reinforced concrete (RC) structures. This paper tentatively studies the feasibility of DIC to reinforcement corrosion induced concrete fracture and cover cracking measurement. Advantages and limitations of DIC-based non-contact full-field measurement for corrosion induced concrete fracture and cover cracking are discussed. Drawbacks in this test need improvement are pointed out and test method for further study of whole process of simulating the real reinforced concrete cracking is put forward.
Measurement of Helmholtz Coil
Authors: Zhu Jun Feng , Yan Xin , Zhou Ling Ling , Zhao Xiao Xin
Published: March 2015

Based on the basic principles of electromagnetism, the application of Shanghai Fudan-day Welcomes UNESCO Instruments Ltd. THQHC-1 type Helmholtz coil magnetic field measuring instrument for measuring coil uniform magnetic field generates a magnetic field on the carrier to get round the coil axis, online circle center at (coordinate origin) at the maximum magnetic field strength. Starting from the coordinate origin, to the sides, the magnetic field lines accelerate the decline, when the distance exceeds the coil radius, the decelerating decline. Conclusions for the understanding of a uniform magnetic field reference.
Reactor Thermal Neutron Spectrum Measurement with Time of Flight Method
Authors: Liu Shu Huan , Jiang Xin Biao , Zhang Wen Shou , Yu Qing Yu , Zhong Yun Hong , Yang Jun , Zhu Guang Ning , Wang Kai , Chen Da
Published: March 2015

The basic principle of neutron spectrum measured with time of flight method was simply introduced. The design of the experimental system for the time of flight spectrum detected in the thermal column of the reactor was offered. The most probable neutron energy of the measured thermal neutron was about 0.0248±0.0007eV, and the spectrum average energy was 0.042±0.001eV. The results showed that the measured spectrum was softer than thermal Maxwellian theory spectrum.
The Study of Harmonic Energy Measurement Based on Atomic Decomposition Algorithm
Authors: Qu Zheng Wei , Li Yan , Hao Wan Ru
Published: March 2015

This paper proposes a new method of harmonic energy measurement based on atomic decomposition algorithm. Firstly, the matching pursuits (MP) algorithm is introduced and harmonic atom dictionary is designed according to the characteristics of signals to be analyzed to improve the effect of signal decomposition. Then, the MP algorithm is optimized by particle swarm optimization (PSO) to reduce the calculation amount. The simulation results of active harmonic energy in steady and unsteady state demonstrate feasibility and accuracy of the presented method.
The Research of Ship Profiles CNC Cold Bending Forming Curve Arc Angle Measurement Control Method Based on Cubic Parameter Spline
Authors: Li Xiang Wei , Wu Bai Hai , Ling Ling
Published: March 2015

This paper presents the curve arc angle measurement control method of ship profiles CNC cold bending forming based on cubic parameter spline. The profile forming method, the approximate arc cubic parameter spline based on accumulative chord length and the principle of arc angle measurement control method are also given clearly. Experiments have been carried out to verify this method.
The Algorithms of AE Processing for Automated Systems to Measure Rheological
Authors: Qin Hong Wu , Cao Fu Cheng , Ovcharuk V.N. , Aishan Maimai Jiang
Published: March 2015

There are the results of the acoustic emission (AE) signals spectrum modification during steel 30XGSA heating near the austenite transformation intervals. It is established in the AE signals spectrum during heating depend on steel phase structure. It makes possible the application of AE method for determination the austenite transformation borders. The critical points of austenite formations and austenite decay are based on heat treatment technologies. It is known, that there are phenomenon of steels properties modification without structure modification not for from phase transformation borders. This was very convenient for detecting the particles with foregone energy characteristics. The automated complex allows one to carry out measurements for a long time using two measuring setups in parallel, which is to study the dynamics of theological and acoustic features of the composition being studied.
Design and Implementation of Security Dynamic Monitoring and Management System for School Children
Authors: Liu Yang , Cai Guo Yin , Zhang Chong , Du Ming Yi
Published: March 2015

Considering the condition that many security accidents of school children have been occurred in campus which were mainly caused by the current lower effective management, this paper proposed a method of positioning the real-time locations of the school children by introducing the RFID technology. In this method, RFID readers were set up covering the campus (such as school gates, classrooms, corridors, playground) and it’s surrounding areas, and each school child was equipped with an ID card (It's actually a RFID tag). A system for dynamic monitoring and management of the school children was developed, which can detect the student cards in real-time and so as to monitor the locations of the school children, recognize dangerous areas and alert as well as automatic statistic of the school children’ attendance. So, it realized the automation and intelligence of the school children security management.
Development of a New Signal Processing System for Pin-Cushion Position Sensitive Detector
Authors: Chen Wei , Chen Si Hai , Luo Dong
Published: March 2015

Due to its high position resolution and fast speed, the position sensitive detector (PSD) is widely applied in micro displacement measurement. However, almost all PSDs suffer from high nonlinearity. In this paper, three kinds of PSDs and their advantages and disadvantages are introduced. Then principle of pin-cushion PSD is studied, based on which a new signal processing system is designed. The signal processing system consists of a high-precision sensor circuit and a software system integrated with a correction algorithm. The test result shows the linearity of the PSD is greatly improved.
Force Analyzing and Parameter Optimization of the Telescopic In-Pipe Robot
Authors: Qu Di , Song Hua , Sun Jing
Published: March 2015

Typical wheeled or tracked robot could hardly apply to middle or small diameter underground pipelines laid by trenchless technology. Aiming at this kind of pipeline’s characteristics, this paper puts forward a basic structure of telescopic in-pipe robot. To provide necessary theoretical basis for the device selection, the mechanical model and force analyzing are given in detail. The speed of robot, as well as the motor torque of locking mechanism, could be expressed as the function of the robot’s structural parameters. As a result, the robot’s structural parameters take influence on its performance. In order to achieve the best performance, it is necessary to use the multi-objective optimization method to select these parameters. Using the genetic algorithm toolbox, the optimal solution of these parameters was obtained. Based on this, the motor torque of locking mechanism is minimum while the speed of the robot is maximum.
Coke Oven Temperature Implicit Generalized Predictive Control
Authors: Zhang Li , Zhang Cheng Jin , Xu Qing Yang , Bao Zeng Jun
Published: March 2015

According to the characteristic of the coke oven process, the IGPC is applied on it. And an improvement is made on the implicit GPC. Introducing the soft coefficient matrix and making up the control increment decrease the calculation. And also, it can restrain overshoot of the output. Finally, the simulation results confirm that the implicit GPC is better than PID control algorithm.
Finite Element Analysis on Multi Parameter Characteristics of Inductive Lubricating Oil Wear Debris Sensor
Authors: He Yong Bo , Feng Wen Wen , Jiang Kun
Published: March 2015

Large wear debris is an important indication of abnormal wear of aviation engines. Analysis of the relationship between particle parameters and the output signal plays an important role to improve the sensor sensitivity. A three-coil simulating sensor model is constructed using APDL finite element program. After analyzing the influence factors to the induced output voltage of the sensor, such as debris material, location, size, exciting current etc, the fitting characteristic curves are obtained, realizing the quantitative analysis. Simulation results show that the sensor model can effectively distinguish between conductive and non conductive, ferromagnetic and non ferromagnetic debris. The induced voltage can reach 10-4 V for the 500 microns ferromagnetic abrasive particles. The characteristic curves provide important basis for further research on sensor structure optimization.
Dynamic Performance Evaluation of Excitation Control System Based on Intuitionistic Fuzzy Sets Strategy
Authors: Zhang Wen Chao , Gu Xue Ping , Liang Hai Ping , Lu Yong , Han Yu
Published: March 2015

To indicate excitation control system dynamic performances comprehensively and objectively, an excitation control system comprehensive evaluation method based on intuitionistic fuzzy sets and TOPSIS is presented. Evaluation indexes such as the conventional unit excitation output response lag time, excitation voltage rise speed, multiple field strong excitation, excitation control system transient gain, dynamic gain and static gain are mainly used. In the evaluation method, the intuitionistic fuzzy sets strategy is used to determine the index weight of excitation control system and the improved TOPSIS is used to calculate the comprehensive dynamic performance of excitation control system. The presented comprehensive evaluation method is verified by actual operation data of excitation control system of multiple generation sets, and the results show that the proposed evaluation method on the performances of excitation control systems of generating sets is effective and feasible.
Dynamic Simulation of an Organic Rankine Cycle (ORC) System Driven by Exhaust
Authors: Wang Zhi Gang , Cheng Jia Guang , Wang Yan , Shen Qiang
Published: March 2015

Organic Rankine Cycle (ORC) is one of the most promising technologies for low-temperature energy conversion. In recent years, it has gotten more attention due to the energy crisis and environmental problems caused by the combustion of fossil fuels. In this paper, a moving boundary model is introduced to describe the transient phenomena of evaporator and condenser, which are the important components of ORC. The simulation results are given to illustrate the efficiency and feasibility of the proposed control strategy.
Force Control Based on Model Predictive for Lower Limb Rehabilitation Training
Authors: Cao Fu Cheng , Qin Hong Wu
Published: March 2015

Human as a varying dynamic system, the control strategies of human-robot interacts differ significantly from that of conventional industrial robot. Considered the patient-centered exercise regimens, a force control method based predict is presented to control a lower limb rehabilitation robot. The control law is introduced that optimises the the maintained force level and limits excessive forceto injury the subject's lower extremity joints. Simulation results show that the robot could guide thelower limb of subjects to move under predefined model of the external force.
Integrated Water Resources Management (IWRM) in the Yellow River Basin
Authors: Wang Xue Chao , Zhou Ke , Zhou Zhen Min
Published: March 2015

The Yellow River is suffered from water shortage. Rapid population increase, unplanned urbanization, intensive industrial. Integrated Water Resources Management (IWRM) is a promising approach in ensuring sustainable management. It entails management of water for various purposes and not for a single purpose which therefore involves different regions aiming at achieving sustainable water resources management. This paper seeks to evaluate recent efforts to implement in IWRM in the Yellow River basin. The paper concludes that reforms such as public participation at local levels, recognition of water as both an economic and a social good, putting IWRM within the larger context of Integrated Natural Resource Management would improve IWRM in the basin.
Modal Analysis of Axial Vibration of Long Pipeline Delivering Coal Slime in Power Plant
Authors: Shi Qing Wei , Liu Ya Yun , Liu Xing Lu , Hao Xue Di
Published: March 2015

Aiming at the problem of intense vibration of the long pipeline delivering coal slime in the power plant, the finite element model of pipeline is established and modal analysis is carried out by ANSYS. The natural frequency and vibration characteristics of axial vibration are obtained. The vibration characteristics are studied and different pipe segments that produce bigger vibration very easily in operation are determined. Theoretical guidance about pipeline vibration under the external load for further analysis is provided.
Structure and Fluid Dynamic Characteristics Analysis of Enclosed Nuclear Electric Valve
Authors: Zhang Chao , Zhang Jin Sheng , Wang Zhi
Published: March 2015

The electric valve, cutting off or connecting pipeline of nuclear equipment, is an essential component of nuclear facilities for safe operation. The structure of self-developed enclosed nuclear electric valve is introduced in the paper firstly, and dynamics analysis of steam fluid in valve is carried out to tackle typical problems including leakage in the rapid open-close process of valve for high-temperature and high-pressure steam fluid. It can be determined that dynamic characteristic of steam fluid will directly affect force suffered by valve in the rapid open-close process, greatly influencing movement and ultimate position accuracy of valve gate.
The Finite Element Analysis of the Floor Damper of High Speed Train
Authors: Wang Dong Zhe , Ge Jian Min , Zeng Xian Kui , Zhang Zong Ting , Lv Chong
Published: March 2015

In this paper, based on the honeycomb floor damper of high-speed train, the finite element analysis was carried out on the floor damper, and we compared the experimental results with the physical model experiments. The results show that: when correction factor γ = 0.5, there is the minimum incremental error of vertical deformation, and the value of the damper parameters is the best at this time.
Study on Properties of EPS Insulation Mortar
Authors: Zhou Wei , Tao Wen Hong , Fu Xing Hua , Liu Chuang
Published: March 2015

This paper deals with the aggregate-cement ratio and the influence of flue gas desulphurization(FGD) gypsum, fly ash and ground slag on the properties of EPS thermal insulation mortar. Results show that with the increase of aggregate-cement ratio, dry density and compressive strength of EPS thermal insulation mortar decreases, water absorption increases, softening coefficient decreases, meanwhile the performance of mortar becomes worse. When aggregate-cement ratio is 6% , the mortar shows the best performance. When aggregate-cement ratio reaches 7%, the mixture is loose in structure and difficult to shape. Fly ash and slag powder improves the performance of EPS thermal insulation mortar significantly, reduces the dry density, increases the comprehensive strength, water absorption and softening coefficient is improved. FGD gypsum makes insulation mortar strengthful, it plays excitation role for the activity in composite cementitious material admixture.
Thinking about the Calculating Formula of Degree of Freedom of Plane Mechanism
Authors: Yue Cai Qing
Published: March 2015

Organization is an organization with a parameter independent degrees of freedom movement, mechanical design and analysis of important concepts, the degree of freedom for the agency when analyzing problems illustrate the organization's scope of application and freedom of formula should pay attention to the issue, and based on this proposed the Reflections, in order to better use and master.
Fast Communication and Efficient Architecture of Intelligent Vehicle
Authors: Zhao Hui , Sun Qi Jin , Zhao Fang
Published: March 2015

Intelligent Ground Vehicle needs real-time communication system and a better architecture to handle a variety of sensors. This paper presents a fast communication and efficient architecture for intelligent vehicle (FCEA-IV). The vehicle contains three control centers, communicating with each other based on real-time control system. And also it has a hybrid mode. In auto driving mode, it will go under the better path, calculated by considering comprehensive environmental factors. While in active control mode, the vehicle will be controlled by remote commands. First of all, we will discuss RCS (real-time control system) and why we choose it. Then the overview of system, including architecture and control structure will be discussed. Further some communication message and work flow will be studied in detail. At last we share some experiments to test the efficiency of the communication system.
The Structure Design of Gait Pole Climbing Robot
Authors: Fu Xiao Jin , Sun Zhao Yang , Zhao Ran , Yin Jian Cheng
Published: March 2015

The theory of gait is one of walking ways which is efficient, fast and stable in a variety of industrial robots, offering a structure of climbing robots in a way of gait and climbing with the gait motion in paper. Through the results of analysis by various industrial software, the presented structure of climbing robots which is composed of two terminal parts and two robot arms that is the part of pedestal and climbing mechanism. In the process of climbing, realizing gripping, Swing work, turning work, an orderly motion and get to the aimed place finally through alternate between the upper and lower part of the body by the control of SCM. The presented method has not only improved many problems like complicated climbing structure, controlling rough, slow-motion and unable thronging obstacles, but also accomplished the subsequent operations like tools delivering, pole testing, clearing, maintenance work, furthermore, there has more comprehensive benefits.
Stability Control of 4WD Electric Vehicle with In-Wheel Motors Based on Integrated Control of Electro-Mechanical Braking System
Authors: Song Chuan Xue , Xiao Feng , Song Shi Xin , Peng Si Lun , Fan Shi Qi
Published: March 2015

Each wheel torque can be controlled independently, so four-wheel-drive electric vehicle can not only control the vehicle stability through hydraulic braking pressure regulation, but also through controlling the motor driving and braking force to generate yaw moment, which are different with the conventional vehicles. 4WD Evs have potential applications in control engineering. Both in-wheel motors and the EHB are actuators for vehicle stability control. In this paper, a vehicle co-simulation platform is constructed through the application of AMEsim and Simulink, additionally, a fuzzy controller is designed to generate yaw moment so as to compensate for deviations between CG slip angles and yaw rate. The simulation results show that the stability control system with motors and a mechanical load brake system can effectively improve the handling stability of the vehicle.
PID Temperature Control Systems of Greenhouse Based on FSM Methodology
Authors: Liu Yang , Qian Ji , Zhou Juan
Published: March 2015

PID Temperature Control Systems of Greenhouse Based on FSM (finite state machines) Methodology is used in variable-temperature-controlled greenhouse. This system cored with an advanced 16 bit RISC (Reduced Instruction Set Computer) MPU MSP430F149 with low power. The sensors employ a higher accuracy Pt1000 Resistance Temperature sensor and Silicon Photoelectric Generator. In software design, it used the thinking of FSM programming increment style PID Control algorithm. The Flexible Application of FSM can make the program clear and more effectively to management. The increment style PID Control algorithm avoids paranormal value when setting temperature is changed and temperature control more accurately. The cite operation shows that this controller has the advantages such as high reliability and good control effect.
Delay-Dependent Criteria for Absolute Stability of Time-Varying Delay Lurie Control Systems
Authors: Xin Wen Fang , Guo Shu Li , Han Li Na
Published: March 2015

A new method for constructing a Lyapunov-Razumikhn function to deal with the stability problem of time-varying delay nonlinear uncertain system is presented in this paper. A quadratic trinomial with two variables（ξ,Τ）is obtained, and then the upper bound of the allowable delay Τ can be obtained by solving the optimization problem with varying positive matrix Q. That is to say, we can obtain the optimal combination of Τ and Q matrix.
A Novel Electromagnetic Navigation Control Approach of Intelligent Car
Authors: Yue Yao Bin , Han Ji Zhi , Wu Bing , Wei Shao , Zhu Gui Xin
Published: March 2015

Considering the limitations of traditional control methods on the steering control of intelligent car, such as insensitiveness in steering, a big large overshoot and oscillation, a new control approach is proposed in this work by utilizing the I/O data to detect the position deviation of the lane with the least square algorithm. In the sequel, an improved PID controller for the steering control is introduced to enhance the stability and response speed of the steering control system. As shown by the test results, the proposed approach is efficient to improve the adaptability and stability of the intelligent car, as well as the dynamic performance of the steering control system.
An Improved Multi-Level Adaptive Control Algorithm Based on Parameters Self-Tuning for a Class of SISO Nonlinear Systems
Authors: Qiao Feng , Liu Zhi Zhen
Published: March 2015

In this paper, a multi-level adaptive control algorithm using parameters self-tuning is proposed for improving the tracking performance of a class of SISO nonlinear systems. This scheme is comprised of the pseudo partial derivative estimation law and the adaptive control law. The adaptive control law is derived from a novel higher order weighted one-step-ahead criterion function which exploits more previous control information. In order to identify the laws’ penalty factors which partly imply the dynamics of the system, an approach of parameters self-tuning is proposed with on-line recursive gradient algorithm. This design is model free and depends directly on the pseudo partial derivative updating on-line with the input and output data Simulation examples are provided to illustrate the effectiveness of the proposed method.
Research on Automatic Control Technology of Tobacco Manufacturing Process Based on IDEF Method
Authors: Gao Yang Hua , Lu Hai Liang
Published: March 2015

In this paper, the author does a study on the China tobacco Zhejiang Industrial co., LTD(ZJ) through building the IDEF0 & IDEF3 models, which can well present ZJ’s logistics process and function. By analyzing the model, the author find the bottleneck link and problems which will affects the efficiency of tobacco manufacturing process, and put forward the author's suggestions according to the actual situation.
Sliding Mode Control for Discrete Uncertain System with Time Delay
Authors: Bu Ni , Chen Wei , Bu Chao
Published: March 2015

This paper considers the sliding mode control for discrete uncertain system with time delay. First, the discrete uncertain system is transformed into a simplified form; then some sufficient conditions of guaranteeing the asymptotic stability of the uncertain system are given; finally the effectiveness of the proposed method is confirmed by the simulations.
The Design of the Loss-in-Weight Weighing Controller
Authors: Rong Li
Published: March 2015

In order to achieve higher precision, reliability and stability, lower cost and power consumption, friendly user interface and network functions, loss-in-weight weighing Controller based on ARM9 and Windows CE is designed for controlling dynamic real time batching equipment. This paper first introduces the working principle and architecture of the embedded Controller, then explains hardware system component and design of software system of the Controller, developed on Platform Builder 5.0. The paper pays more attention on the application layer development. Subfuctions of application software are introduced and working flow chart of main modules is given. Double incremental PID algorithm used by the system is presented to achieve the highest accuracy in the shortest possible time. The high precision 0.1% can be achieved, and Controller products are widely used in the metallurgy, chemical industry.
6-DOF Virtual Flight Control Simulation of Wire-Driven Parallel Manipulator
Authors: Wang Yi Long , Wang Xiao Guang , Lin Qi
Published: March 2015

As to a 6-DOF wire-driven parallel manipulator in the application of virtual flight experiment of wind tunnel, the high precision motion control of supported aircraft model has been researched. First, the integrated dynamic model of the system has been established, and a proportional and differential controller has been designed on the base of position feedback. Finally, the numerical simulation of motion control system has been done in the example of 6-DOF motion. The analysis result shows that the high precision motion control can be achieved by PD control law for aircraft model, and the system stability could be improved by selecting wire tension coefficient properly, which can provide theoretical reference and support for virtual flight experiment of complex model and has great practical application value.
A New Sliding-Mode Observer for Sensorless Control of Permanent Magnet Synchronous Motor
Authors: Han Tong Yi , Wang Zhong Hua , Han Fei Fei
Published: March 2015

In this paper, a new sliding-mode observer (SMO) for sensorless control of permanent magnet synchronous motor (PMSM) is proposed. The observer is built based on the study of the back electromotive force (EMF) equivalent control. The new SMO, which substitues a hyperbolic tangent function for the signum function with a variable boundary layer, can reduce the chattering phenomenon. In order to overcome the time delay, we cancelled the low-pass filter and phase compensation module. In this way, not only the structure of the observer is simplified, but also the estimation precision is improved. The simulation results prove that the new SMO has a good dynamic performance and static quality.
Effect of Grain Size on Erosion Wear of B4C/TiC/Al2O3 Ceramic Nozzles
Authors: Sun Jun Long , Liu Chang Xia , Liu Jian Xia
Published: March 2015

The effect of grain size on erosion wear of B4C/TiC/Al2O3 (BT) ceramic nozzles was studied. XRD analysis showed that B4C/TiC/Al2O3 ceramic nozzle was composed of B4C, TiB2, Al2O3 and C. The erosion experimental results showed that grain size affected the erosion behaviours of BT nozzles significantly. The volume erosion rate of BT2 nozzle was enlarged by 0.88 times than that of BT1 nozzle. Analysis of experimental data and observations on the worn surface revealed that the enhancement in the erosion resistance for BT1 nozzle was mainly owing to the finer grains in nozzle, which resulted in improved fracture toughness.
Modified Power Compensation Control Strategy of Three-Phase Grid-Connected Inverter under Unbalanced Grid Voltage Conditions
Authors: Sun Shao Hua , Ben Hong Qi
Published: March 2015

Control strategy under unbalanced grid voltage conditions is one of the most important issues for grid-connected inverter. Under unbalanced grid voltage conditions, the 2nd active and reactive power ripples generate, they pollute the grid. To meet the demands of IEEE Std.929-2000, this paper proposed a modified power compensation control strategy; the proposed solution is based on direct power control. To provide accurate compensating power, the power model of three-phase inverter under unbalanced grid voltage conditions is given, using the positive sequence current component and the negative sequence voltage component, the compensating powers are calculated in details. Theoretical analysis and comparative simulation verification are presented to demonstrate the effectiveness of the proposed control strategy.
Research on the Large Disturbance Characteristics of the Pumped Storage Motor with the Time-Stepping FEM Consequently
Authors: Huang Sheng , Kang Jin Ping
Published: March 2015

In recent years, the proportion of pumped storage power station in the power grid is increasing, which has many special advantages. The pumped storage motor has two kinds of working condition of generator and motor, not only can the system regulate the reactive power, but also can modify the power factor of the grid resulting in the reduction of the investment on the reactive-power-compensation equipment. On the other hand, the above system is able to enhance both the stability and the overall efficiency. Pumped storage motor start-stop and working condition switch frequently. The test will be analysis and researched with the Time-stepping FEM Consequently, this paper analyses the large disturbance characteristics of the pumped storage motor.
Space Vector Control of Permanent Magnet Synchronous Motor Based on 60o Coordinate System
Authors: Li Jia Xian
Published: March 2015

Permanent magnet synchronous motor mathematical models of synchronous rotating coordinate system are decoupled by rotor field orientation. Then, the speed regulator, current regulator and space vector control system are designed. The current inner ring and speed outer ring ensure the accurate tracking of current and the accurate control of speed. To reduce the control algorithm computation, SVPWM control strategy based on the 60o coordinate system is used on the permanent magnet synchronous motor control system. Simulation results show that the space vector control system has good dynamic characteristics and the control scheme is feasible.
Research and Development of FPGA Solar MPPT Algorithm
Authors: Qin Qing Liang
Published: March 2015

In order to improve the development using FPGA solar panels generating speed, through the study on the solar panel maximum power output perturbation method (MPPT) how to develop and how to improve the development efficiency were studied. This algorithm through MATLAB Simulink simulation is confirmed, then use generator to simulate the algorithm, and the algorithm is downloaded into the FPGA, the hardware co_simulation, design of MPPT circuit will be in accordance with the circuit parameters of the modified. Through the hardware circuit operating results, it is proved that the algorithm design of circuit is correct and meet the design requirements, also demonstrate the utility of using generator hardware co_simulation method for the development of FPGA. The development method can improve the design speed, shorten the reliability of control, the development cycle and reduce development costs, achieve a fully compatible and replace physical circuit.
The Research of Multi-Wave Impedance Model Based on Different Tower Structures
Authors: Lou Jie , Zhao Jun Long , Zou Zhen Yu
Published: March 2015

This paper mainly discusses the tower models in lightning overvoltage calculation, especially analysis the lossless and lossy models. Build the muti-wave impedance model of the most commonly used towers, which are portal tower, glass tower, cat head tower and strain tower in accordance with the reality. The simulation shows that muti-wave impedance model has a higher lightning overvoltage than simple model under the same condition. This is because the simple model ignores the influence of resistance and inductance, so the more accurate the model is, the more effective the protection will be.
An Improved L Index for the Static Voltage Stability Assessment of Power System with ZIP Loads
Authors: Liu Rui Huang , Xue An Cheng , Li Ming Kai , Li Cheng Rong
Published: March 2015

This paper proposes an improved L index which is adapted to analyze the voltage stability of power system with the ZIP loads. First it introduces derivation of the traditional L index. Then, it analyzes the differences between ZIP loads and PQ loads and then proposes an improved version of L index based on the derivation. Furthermore, the proposed improved index is used to analyze the voltage stability under different operation conditions of the power system with ZIP loads. The simulations show the effectiveness of the proposed improved L index.
A Novel Reactive Power Compensation Approach Based on Particle Swarm Optimization
Authors: Li Yun Zhi , Yuan Quan , Zhao Yang , Gang Qian Hui
Published: March 2015

The particle swarm optimization (PSO) algorithm as a stochastic search algorithm for solving reactive power optimization problem. The PSO algorithm converges too fast, easy access to local convergence, leading to convergence accuracy is not high, to study the particle swarm algorithm improvements. The establishment of a comprehensive consideration of the practical constraints and reactive power regulation means no power optimization mathematical model, a method using improved particle swarm algorithm for reactive power optimization problem, the algorithm weighting coefficients and inactive particles are two aspects to improve. Meanwhile segmented approach to particle swarm algorithm improved effectively address the shortcomings evolution into local optimum and search accuracy is poor, in order to determine the optimal reactive power optimization program.
Matpower CPF Program Improvement and Steady-State Voltage Stability Analysis
Authors: Zhang Qian , Tang Fei , Xu Junru , Zhao Ting , Yang Jian
Published: March 2015

In steady-state voltage stability analysis, Continuation power flow (CPF) method is widely used for it can track power flow solution at the critical voltage point. The existing matpower CPF program can only simulate PV curve of a single bus when load increases at one certain bus. In this paper, original CPF program will be modified to be more flexible and in line with the actual situation. Several indices will be proposed to discuss how to determine the first crash bus (namely the system vulnerabilities) when load increases at multiple buses. Simulation results of a regional power grid in northern China verify the validity and practicability of the proposed method.
Probabilistic Interval Prediction of Wind Power
Authors: Yang Mao , Du Gang , Sun Li
Published: March 2015

As wind power generation rapid development in china, wind power prediction is the key to the system operate safely. Given significant uncertainties involved in wind generation, probabilistic interval forecasting provides a unique solution to estimate and quantify the potential impacts and risks facing system operation with wind penetration beforehand. this paper based on the point forecast, calculate wind power prediction error, formulate the distribution of prediction error, you can get the historical probabilistic distribution of prediction error, use the distribution of error to build the risk assessment of wind power after prediction, give the fluctuate range of predicted values. Probabilistic interval forecasting can obtain the probably of power system operation safely and reliability assessment criterion.
Research on Switching Technology of Aviation 270V DC System
Authors: Zou Peng , Wu Jian Wen , Zhang Bin , Zhou Jun Liang
Published: March 2015

In this article, large capacitor charging and discharging experimental system is utilized to generate 270V DC-current by pre-charging to the large capacitor and discharging. Interrupter switching experiments of 540A, 1800A are done in aviation environment, and results of arcing breakdown manner are analyzed and explained. The experiment results indicate that 270V DC-current and arc in aviation environment can be broken by the way of using IGBT in appropriate time; In aviation environment, the breaking capability can be improved, and arcing breaking manner can be used to estimate the arc time constant by several experiments.
Study on Improving Consumption Capability of Wind Power by Installing Thermal Storage in Ningxia Province
Authors: Wang Xiao , Chen Lei , Zhang Le Ping , Ma Tian Dong , Tian Zhi Hao , An Jun
Published: March 2015

With the rapid development of wind power industry, the wind power absorption problem has become an increasingly severe challenge which China's power industry is faced with. In fact, through the configuration of large capacity thermal storage devices in the existing power system, an electrothermal association system is formed by combining electric power system with thermal system, which can not only increase the peak load regulation capacity of the system, but also increase local load, thus greatly improving the wind power absorptive capacity of electric power system. This paper will make an systematic analysis of the mechanism of promoting the wind power absorptive capacity of electric power system by utilizing thermal storage devices, and the feasibility and prospect of the proposed plan by combining with the actual situation of Ningxia, and lays the foundation for the further study of thermal storage devices in electrical power system.
Study on the Line Overload Harmonization and Optimization Control
Authors: Wang Yang Guang , Guan Xiao Fang , Chen Lei , Wang Jing Zhong , Hu Wei Min , Yang Shi Yong
Published: March 2015

The line overload is discussed and the coordination and optimization model of preventive and emergency control is proposed in this paper. It combines with the sensitivity’s concept and reverse phase equivalent matching adjustment principle, takes into account the severity of the accident probability and consequences, and introduces the important factor of the corresponding accident; adjust automatically according to the influence degree of the accident to the power grid. Getting reasonable coordination optimization strategies to ensure the safety and economy of the system is effective and verified by this paper.
PEMFC Parameter Simulation Based on MATLAB/SIMULINK
Authors: Chen Shi Zhong , Bao Zhi Gang , Wang Yi Cheng
Published: March 2015

Proton Exchange Membrane Fuel Cell (PEMFC) is established for the numerical simulation computation by using the MATLAB/SIMULINK, By changing the different working conditions, The proton exchange membrane fuel cell output performance is analyzed .Data show that the hydrogen pressure, oxygen pressure, current density, temperature, has certain influence on voltage and power distribution of PEMFC, For PEMFC to normal and stable work, according to the above conditions should be obtained the optimal value, thus ensuring optimal output performance of PEMFC.
Hysteretic Control Technology in New Flexible HVDC
Authors: Qin Qing Liang , Yao Xiao Hui , Zhang Dian
Published: March 2015

The nearest level modulation (NLM) is commonly used in the multi-level multi-module converter (MMC), which need to convert the fractional part of the input sine wave to the digital signal (DPWM). However, the narrow pulse width of digital signal , the frequent change of the digital signal and the frequent instability of output are caused by the sensitive fractional portion of the input, which push Multilevel converter into the position where it has to operate in high frequency and be unstable. In order to solve the problem mentioned above, this paper provides a way called hysteresis comparison to meet the control requirements of precision, adopting the comparison between the fractional part and triangular carrier wave. The approach this study provides is called hysteresis comparison which not only can ensure the stability of the output of the digital signal but also can be able to obtain better digital pulse width by adjusting hysteresis threshold trigger. At the same time, it could ensure the stability and pulse width of the output by means of reducing the frequency of the digital output. The feasibility of this approach has been certified by the simulation of field-programmable gate array (FPGA). Apparently, the actual results show that this method can optimize the control of HVDC Flexible.
Design of Frequency Selection Circuit of Advanced Detector Receiving Device in Coal Mine Roadway
Authors: Liu Xi Gao , Liu Zhi Min , Zhang Jin Tao , Lv Yi Ming , Zhou You , Wu Liang , Wu Miao
Published: March 2015

Coal mine roadway advanced detector, including the transmitting and receiving devices, is a kind of geophysical instrument used in coal mine roadway advanced detection based on the dynamic and directional electric field excitation method. The transmitting device emits dual frequency modulated square wave current into the excavation face and the receiving device receives potential difference of coal and rock medium generated by induced polarization, of which the frequency selection circuit is to filter the interference of the harmonics of the signal and other frequency components. The paper derived expressions of emission current. Considering the actual working conditions, the paper proposed the design requirements of the frequency selection circuit and the scheme of a controller to control multiple frequency selection filter circuits. The paper completed the design of the control circuit consisting of a microcontroller and analog switch MAX313 and the band-pass filter circuit consisting of universal active filter UAF42. According to the circuit simulation and the analysis of the data with software of multisim, it proves the design of circuit meets the requirements.
Review of Vision Inspection Technology for Surface Defect of Steel Bar
Authors: Li Wu Bin , Zhang Quan Zhong , Sun Jun Long , Liu Lu , He Shi Long
Published: March 2015

With the increase of requirement for the quality of raw materials in industry, surface defect inspection of steel bar has been an essential part of industrial production. The characteristics of vision-based detection technology for steel bar surface defect and the newest research development were introduced. The working principle of vision inspection technology and key issues were analyzed. Finally, the current domestic research emphases and development trends were proposed.
Binarization Segmentation Based on Fuzzy Clustering Theory
Authors: Wang Hong Jun , Song Hao , Zhao Hui , Yue You Jun
Published: March 2015

Aiming at the problem of color image two value segmentation, present an improved two value plant image segmentation method based on fuzzy clustering theory. In the light of the problem that fuzzy clustering algorithm is difficult to segment the low SNR image, improve Membership function; Aiming at the problem that image pixel information is too large, mapping image information to the gray feature space, treat the same gray pixel as a whole, improve operation efficiency. The experimental results show that, the improved algorithm has stronger anti noise ability, higher segmentation accuracy, shorter operation time, has good prospects for engineering applications.