bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Stress of the Oxide Scales on the Superheater Tubes under Uneven Circumferential Loading
Authors: Li Qing Wei
Published: December 2013

Oxide scales have negative effects on the security and economy of supercritical and ultra-supercritical units.The finite volume method was exploited to simulate oxide scales growth temperature on the inside of superheater tube,then the appropriate time and spatial intervals were selected to calculate oxide scales thickness along the circumferential direction with the correspond growth temperature.At last,the stress response of the oxides was simulated with finite element method.The simulated temperature is closed to the analytical temperature, confirming that the simulation results are credible.The results show that the growth temperature rises fast at the beginning and drops in the circumferential direction,which changes rapidly at the 90°. Oxide scales thickness is thinner and thinner in the circumferential direction and changes fast at approximately 90°.Though the magnitude of circumferential stress and axial stress is different, but the trend same.The simulation results can provides a theoretical basis for the failure research of the oxide scales.
Heat Exchange Calculation of a Regenerative Air Heater with Numerical Simulation Method
Authors: Wei Ri Guang , Qu Zhen Xiao , Gao Jian Qiang
Published: December 2013

According to the structure and working principle of rotary air preheater,the heat transfer calculation model is set up with reasonable simplification. Combining with the design parameters of the rotary air preheater of a 400 t/h pulverized coal boiler unit ,the results of practical calculation show that the said thermodynamic calculation method not only has higher precision of calculation,but also can get the temperature distributions of the gas, air and heat surface in each cross-section of the rotary air preheater. The result of numerical simulation calculation tallies well with the original designed data. It can be used for the heat calculation both two-sectorial and three-sectorial air heater; it can be used for performance analysis of the regenerative air heater.
The Study of Medium/Low-Temperature Stirling Engine Power Output Characteristics
Authors: Sun Wei Dong , Li Qi Fen , Zhao Lin Hui , Song Li Fei , Zhao Xin
Published: December 2013

Stirling engine has the characteristics of diversification of heat source and high thermal power conversion efficiency. It has broad application prospects in using low-grade energy, such as solar energy, biomass emergy and industrial waste heat. In this paper, Schmidt Method used in the Stirling engine working cycle is analyzed theoretically, and the Stirling engine power output is calculated. The effects of temperature and the average cycle pressure on the output characteristics of the system are analyzed. Theoretical calculations show that the output characteristics can be improved significantly by adjusting the heating temperature and the average cycle pressure. An experiment station is then designed and constructed for the research on Stirling engine power output characteristics. Experimental results show that by improving pre-charge pressure in the working chamber with low temperature conditions, the system can achieve higher power output and thermal efficiency. Pre-charge pressure in the working chamber is adjusted to 2MPa, when the heater tube wall temperature reaches 650 °C, the output power exceeds 1750W, and the effective efficiency will be 23.3%.
Safety System Analysis on Gas-Steam Combined Cycle Power Plant
Authors: Zhang Jin Feng , Li Zai Xing , Liu Xin , Sun Zhong Qiang
Published: December 2013

Risk factor in gas-steam combined cycle power plant (CCPP) was identified by application of safety system engineering principles and techniques. The CCPP system was divided into gas transmission subsystem, gas turbine subsystem, waste heat boiler subsystem, steam turbine subsystem and generation & transformation subsystem. The accident-proneness areas in each subsystem were studied, and various accident-causation modes were clarified. The bursting leakage accident caused by failure of steam-water pipelines was analyzed, and evaluated with Fault Tree method. The targeted countermeasures of safe operation and management were proposed.
Performance Testing of Pico Hydro Generator for Electricity Generating
Authors: Keawsuntia Yuttachai
Published: December 2013

This research paper presents the testing results of the electricity generating from the pico hydro generator, for save in a battery 12 V. A testing of pico crossflow turbine with 0.6 m diameter of wheel and a 20 blades water turbine which has a semi-circle shape at 0.1 m diameter of blade, connected with the generator at gear up ratio of 1:3 and 1:5 respectively, was undertaken. The results from the test run of pico hydro generator by varying flow rate from 60 to 120 L/min at 0.0127, 0.0190 and 0.0254 m diameter of nozzle respectively, showed that the gear ratio between the water wheel and the generator, the diameter of nozzle and the volume flow rate are important variables that affect the electric production. A combination of water flow rate at 120 L/min, 0.0127 m diameter of nozzle and gear ratio of 1:3 gives the maximum electric power of 121.68 watts.
Numerical Simulation of Fluid-Structure Interaction with Water Hammer in a Vertical Penstock Subjected to High Water Head
Authors: Zhang Hong Ming , Zhang Li Xiang
Published: December 2013

The theoretical model of weakly compressible coupling water hammer was established and a FSI program code was developed for coupled weakly compressible water with penstock movement. It combines the weakly compressible water source CFD code and FEM shell element code. The shell element based on orthogonal curvilinear coordinates was completed in FEAP. Meanwhile, the turbulence model in OpenFoam class library was called by using object-oriented technology. This code takes into account both the weak compressibility of water and fluid turbulence characteristics. Using this code, a fluid structure interaction analysis with water hammer was completed. The numerical results agree well with the field test results.
The Fault Diagnose of Advanced Amphibious Assault Vehicle Fan Pump Based on Principal Component Regression
Authors: Zhan Huan , Dong Yu Cai , Yi Liang Hai , Cao Su Na , Jin Qi , Liu Yan Xia
Published: December 2013

The fan pump hydraulic system of amphibious assault vehicle is prone to fault , an pump leakage model is established by principal component regression. This new modeling strategy can effectively extract on the components which have a strong explanatory role of the dependent variable, it achieves regression modeling in multiple arguments correlation conditions, and allows the inclusion of all the original variables. This model get rid of drawback that the least squares regression can not effectively identify and eliminate the influence of the multiple relativity among factors.
Finite Element Analysis on Green Grinding Ti6Al4V Alloy with Inner-Lubricating Wheel
Authors: Huo Wen Guo , Cai Lan Rong , Juan Shao , Yang Feng
Published: December 2013

The objective of this work is to model the cutting properties generated during grinding with internal lubricating wheel. Grinding FEM was carried out with this internal lubricating wheel. The machining properties were assessed in terms of grinding temperature. The results showed that an obvious effect in decreasing the cutting temperature can be obtained by reducing the friction coefficient between the self-lubricating wheel and the TC4 alloy through delivering the solid lubricant directly to the surface of the wheel without the use of inner coolant conditions.
A TRNSYS Component Modeling Method for a New Kind of Solution Dehumidifier
Authors: Ruan Ying Jun , Yang Jie Dong
Published: December 2013

This paper introduces a way to build a model for a new kind of solution dehumidifier, and discusses the way to construct TRNSYS components for different kinds of solution dehumidifiers, and the factors that have the most important influence on the precision of the component have been presented. This paper contribute to the component library of TRNSYS, which will make TRNSYS capable to simulate THIC system.
Indoor Thermal Environment Research of Air Conditioning Office with Air from Window Gap
Authors: Liu Ze Hua , Liao Yan , Yu Hao Ping
Published: December 2013

The paper presents a numerical simulation study of indoor thermal environment of an air conditioning office in winter in Hengyang. Considering the effect of air infiltration from window gap, the distribution of indoor temperature field, velocity field and humidity field can be obtained when air supply angle is 45° down to the horizontal direction. Compared with simulation which air infiltration is ignored, the results show that average temperature of air conditioning area reduces 0.6 °C in Y = 1.1 m section. Air velocity is larger in Y = 1.1 m air conditioning zone. The air speed is greater than 0.2 m/s in local area, a sense blowing. Average relative humidity is larger in Y = 1.1 m air conditioning area. The research indicates that air infiltration can not be allowed to be neglected in numerical simulation.
Design of Multi-Function Refrigerator with Refrigeration and Constant Temperature and Hot Water
Authors: Zhou Dong Yi , Shi Chu Ping
Published: December 2013

A new model of the refrigerator with refrigeration and constant temperature and hot water has been trial-produced. The new refrigerator can not only keep refrigerated food quality, but also be used for heating or keeping food temperature constant, and supply hot water for us. The subsystems of condenser have been analyzed and designed including air-cooled method and water-cooled method. According to the theoretical calculation, the temperature in constant temperature box can keep about 50°C and 18.46 Kg hot water can be provided per hour.
The Performance of a Common Rail Diesel Engine Fueled with Different Blending Ratio of Biodiesels at Different Altitudes
Authors: Tan Ze Fei , Shen Li Zhong , Jin De Cai , Ou Yang Wen Bin
Published: December 2013

To study the effect of the biodiesel on the performance of the high pressure common rail diesel engine performance, a experiment is conducted about the high pressure common rail diesel engine uses diesel fuel and different blending ratio of biodiesels. The results show that with the rising of the altitude, the engine power and the brake specific fuel consumption reduce, exhaust gas temperature increases; At the same altitude, the engine fueled with different blending ratio of bio-diesel has higher brake specific fuel consumption in comparison with fueled engine, but it has lower power, with the increase in bio-diesel blending ratio, engine power, fuel consumption increase.
Design of Bilateral Switched Reluctance Linear Generator to Convert Wave Energy: Case Study in Sicily
Authors: Di Dio Vincenzo , Franzitta Vincenzo , Milone Daniele , Pitruzzella Salvatore , Trapanese Marco , Viola Alessia
Published: December 2013

The aim of this work is a case study of the adaptation bilateral switched reluctance linear generator to the exploitation of energy of the sea. This type of generator can be used to convert wave energy in electrical energy.
In this paper we present an analytical sizing and FEM simulation. As for the results, analysis of the data extracted through the simulations it was possible to calculate the emf. The emf was calculated in two cases of motion of the slider: first hypothesis has set the constant speed while the second is a variable speed according to the law of an oscillatory motion of the sea.
Dynamic Crankshaft Strength Calculation of Diesel Engine Using Simulation Techniques
Authors: Ding Yu , Sui Cong Biao , Yao Yuan
Published: December 2013

Crankshaft is one of the most important parts in diesel engine. The fatigue failure and fracture of crankshaft may lead to damage to the other parts, even some accidents. Recently with the increasing requirement of engine power and engine reliability, the investigation of the crankshaft strength becomes more important. Since during the engine work process, the extremely complicated force are loaded on the crankshaft and different vibration caused by torque, bending, etc., the crankshaft may create the resonance and appended dynamic stress in the working frequency range, which will be easy to bring about the bending and torsion damage after short work period. In this paper, the traditional algorithm on the basis of MATLAB/SIMULINK software is used to carry out the dynamic calculation and analysis for a certain type of diesel engine crankshaft. The crankshaft stress state and its variation are analyzed, and the results of the bending moment, torsion versus crank angle are obtained. Finally, the fatigue strength of crankshaft is checked and the safety factor is calculated to verify the crankshaft reliability.
EGR System Performance Optimization of Diesel Engine Based on GT-Power and Fluent Co-Simulation
Authors: Hou Xian Jun , Chen Shu , Liu Zhi'en
Published: December 2013

A calculation model of turbocharged diesel engine was developed based on one-dimension simulation software GT-power,which can provide a steady boundary condition for the flow field analysis of EGR system.The three-dimension simulation software Fluent was applied in establishing the flow field model of the air-intake system under different air inlet position to analize the distribution of the exhaust gas,and then obtained the impact of the EGRs air-inlet position to uniformity of EGR system, thereby we could acquire the parameters which achieves the best maching between the EGR system and the diesel engine, it also provided a reference for engine performance optimization.
Simulation Analysis and Evaluation of Inner Airflow Characteristics on the 2.0L Di Engine
Authors: Li De Gang , Han Xiao Mei , Lin Xue Dong , Luan Xiao Fang , Zhang Le
Published: December 2013

In order to assess the rationality of the combustion chamber structure of 2.0L diesel engine equipped with high pressure common rail system, evaluation methods of the interior flow dynamic characteristics was put forward .And numerical simulation was carried out on the effect of different combustion chamber structure matching different fuel injection system parameters on the transient distribution of velocity field, concentration field, temperature field. The results show that: the suggested evaluation method in the combustion chamber structure design is reasonable; and for certain injection system, reasonable design and optimized combustion chamber structure parameters are used to organize air flow characteristic effectively. These are important measures to realize energy conservation and emission reduction on diesel engines.
Research on Feed-Forward Controller for Electronic Throttle Control of GDI Engine Based on Nonlinear Model
Authors: Li De Gang , Li Chuang , Shi Wen Ku , Jiang Tao , Wang Xiao Yan
Published: December 2013

The nonlinear Hammerstein model was designed. The model was used to compensate the dynamic behavior of an electronic throttle body at different operating conditions. It consisted of a static nonlinear function and a dynamic linear function. The static nonlinear function was used to representing the coulomb friction and limp-home return springs and the dynamic linear function was used to representing dynamic piecewise-linear characteristic. An observer model, known as kalman was used for the on-line throttle position and angular velocity estimation. The control strategy was designed which combined the feed-forward control based on Hammerstein model and feedback control based on proportional-integral-derivative (PID) controller. The control structure has the quick response characteristic of the feed-forward control and disturb compensation characteristic of the feedback control. The experimental results revealed that the dynamic position control delay less than 100ms, the static position error less than 0.5o and the controller satisfied requirement of GDI for precise in-charge control.
Full Power Back-to-Back Test Platform for Large Scale Electrical-Excited Direct Driven Wind Turbine
Authors: Yan Shuai , Wang Hong , Chen Yang , Liu An Ye
Published: December 2013

To solve the problem about prototype development of electrical-excited power conversion system of large-scale direct-driven wind turbine and the test challenges during mass-production, advance technology solutions by full power back-to-back testing, focusing on the electrical topology including the key technologies and the working modes. Finally, introduce the relevant standards and the test methods in pilot project, listing part of test results and their analysis.
Effects of Ethanol-n butanol-diesel Oxygenated Fuel on Performance of Diesel Engine
Authors: Xiao Ming Wei , He Jin'ge
Published: December 2013

The experiments of the economy performance and emissions of diesel engine fueled with ethanol-n butanol-diesel were performed on a dual-cylinder direct injection diesel engine. The results show that without modification on the engine, while the mixed proportion of ethanol getting larger, the equivalent brake specific fuel consumption decreases and effective thermal efficiency increases when the diesel engine work on medium and high loads condition, NOX emissions and smoke decreased obviously. But the smoke increased when the proportion of ethanol is 20%. And the results also indicate that it is beneficial for decreasing the smoke and NOX emissions to reduce suitably fuel supply advance angle when the diesel engine fueled with blend fuel mixed high proportion of ethanol.
Security Pricing Model Based on Dynamical Security Region under Power Market Environments
Authors: Liu Huai Dong , Wang Hai Bo , Chang An , Yuan Bao Qing , Han Nai Qiang
Published: December 2013

Under power market environments, generator companies and power users are economic decision-makers and the ISO is the security decision-maker. The non-unique solution of security decisions may result in unfairness. At the same time, more and more power systems are operating near their security limits, thus the influence of uncertainty factors to security can not be ignored. To solve the above problems, the presented security pricing model in this paper suggests that security prices are calculated and released, which inducts and excites the market-participants separate decision-making, thus system security is maintained. Influences of the uncertainties of power loads and fault parameters to system security are taken into account. Furthermore, the system security and economy are unified in the model.
Demand Response Based Household Electricity Intelligent Interactive Terminal Design
Authors: Li Dong Dong , Ren Jing Wei , Xu Yi Xun , Zheng Xiao Xia , Lin Shun Fu
Published: December 2013

Against the background of the development of the smart grid, in order to promote the development of intelligent electricity in the residents side, developed a demand response based household electricity intelligent interactive terminal. The interactive terminal use configuration software as platform, combined with the existing peak-valley price and ladder price in Shanghai, consider of the real-time price mechanism and interruptible load mechanism of the demand response, cooperate with the intelligent socket which independently researched and developed, the intelligent interactive terminal is family oriented with information visualization, with a variety of control methods and easy to use. Through simulation and experiment, the terminal can achieve user-friendly, save energy, convenient supply company and user control, and improve the effect of users life habit.
Research on TCSC and Active Power Filter Apply to Improve Power Grid Based on Matlab Analysis
Authors: Pan Quan , Song Hong , Zhao Wen Liang
Published: December 2013

Industrial and agricultural production as well as the general public because the demand for is much larger, the electricity grids integrated-transportation network multiple transformer output to the end-use equipment bring great difficulties and many other different failures, resulting in a lot of energy wasted . This article is mainly to use the thyristor controllable series compensated (short for TCSC) for power during transmission of some compensation to make the system voltage stabilized and improved, combining with active power filter (short for APF) will suppress and filter out a series of primary and secondary synchronization harmonic interference etc. not only improve the effectiveness and utilization of electrical energy, but also purify the electricity grid environment. By the simulation results show that the power to improve the stability and quality are very good results.
Experimental Investigation and the Development of Phase Change Heat Storage Device Adapted to the Solar Energy Heat Pump
Authors: Zhang Hong Chen , Wang Hong Tao , Li Feng Li , Zhang Li Qing
Published: December 2013

on the basis of the working principle of solar heat pump system is introduced in this paper, Focuses on the structure of the heat storage device and the selection of phase change materials, structure, The influence of phase change materials the size of the diameter to heat-exchange, The influence of phase change materials piled up form to heat-exchange, The influence of thermal fluid flow velocity to heat exchange , In-depth analysis of phase change materials and thermal fluid accumulation of heat and heat release process , Solve the problem of supercooling and dialysis of phase change heat storage materials, The use of phase change materials have a positive reference value.
The Trans-Provincial Peak Regulation Market Design
Authors: Mei Jian , Zou B.
Published: December 2013

The participants utility of the peak regulation market is analyzed in this paper. And then a trading model of the market is proposed which employed the marginal generating cost as decision variables. Using the proposed trading model, the market characteristics are revealed that the total generating costs are reduced after peaking transaction. The bidding, market clearing and settlement rules are given based on the trading model. A case study illuminates the theory results.
Branch-Current Algorithm Based Three-Phase State Estimation in Distribution System
Authors: Liang Hai Feng , Yu Xiao Lei , Shen Ding Hui , Zhang Jing , Wang Cheng Shan
Published: December 2013

This paper presents a branch-current distribution system state estimation algorithm considering zero-injection constraints. The algorithm takes the branch-current amplitude and phase angle as state variables, considering current-amplitude measurement easily without measurements conversion and makes full use of voltage amplitude measurements, power measurements and current measurements. In order to improve the robust performance of algorithm, exponential function is adopted as the objective function in this paper. The paper takes simulation test to verify the algorithm correctly and effectively on improved IEEE 34 nodes system.
Shunt Petersen-Coil with Resistor for Single Phase Fault Detection in Resonant Grounded Power Distribution Systems
Authors: Meng Xiao , Tai Neng Ling , Hu Yan , Yang Xia
Published: December 2013

The failure current in resonant grounder power distribution system is small, so it is difficult to detect the fault feeder. This passage presents the equivalent circuit of resonant grounded system, and discusses the difference of electrical characteristics between faulty feeder and sound feeders by using shunt resistors. To reduce the influence of shunt resistors on the system and improve the detection sensitivity, it presents the method of shunting multi-level resistors, and it proves the sensitivity and reliability of this method by EMTP simulation.
Study on Detection Method of Electrical Shock Current Based on Sliding Window and Wavelet Transform
Authors: Li Chun Lan , Du Song Huai , Shi Zhai , Su Juan
Published: December 2013

With the popularization of the rural electricity utilization, the rural electric safety was still an immediate problem to be solved. It was difficult to exactly detect and judge electric shock signals in the summation leakage current on the low-voltage electric power grid. A detection method of electrical contact signals based on sliding window and wavelet multi-resolution method was proposed. Under the different signal-to-noise ratio level, the summation leakage current was reconstructed by wavelet decomposition reconstruction algorithm. According to the characteristic of the slow change of the normal leakage current and the rapid change of the electric shock current within a short time, the electric shock current were extracted from the restructured summation leakage current signal by sliding window method. The mean square error and correlation analysis between the extracted signal and the actual testing results were studied. The analysis results show that the proposed method could identify electric shock current in the summation leakage current among noise, and its detection precision was superior to single sliding window method.
Research on Monitoring System of Hydropower Substation Based on RFID Technology
Authors: Wang Wen Xing
Published: December 2013

After analyzing briefly the structure of hydropower substation monitoring system, positioning system roadway based on RFID was put forward connected with communication and monitoring networks existed already. the separate monitoring systems of environment is integrated with the former comprehensive automation system into a unique system. It's a new step of substation automation. The system architecture, software, hardware and the necessary factions of this system are introduced in detail for reference of practical design. In Hydropower substation tunnel, monitoring identity code terminal station are set along the power line information, collect personnel information data by receiving wireless signals.
Reliability Evaluation & Analysis of UHVDC Transmission System
Authors: Zhao Cong , Zeng Yuan , Lei Guang Yu
Published: December 2013

The reliability of UHVDC (ultra-high voltage direct current) transmission system is significant to the development of power grid. The paper selects dual 12-pulse converters on each pole to model and analyze the UHVDC transmission system. Firstly, the system is divided into six subsystems to evaluate the reliability by the fault tree analysis method. Then based on the fault frequency and the repair time of each subsystems bottom components, the paper calculates the fault frequency and the repair time of each subsystem. Using the frequency and duration method, the paper calculates the fault probability, fault frequency and repair time of the whole system. Finally, it is validated by the actual data of typical lines.
Quantitative Analysis of Rogowski CT Frequency Characteristics
Authors: Liu Zong Jie , Chen Xiao Xin , Jin Fang Yuan , Kong Ling Ming , Tian Chong Feng , Liu Chang Zheng
Published: December 2013

Partial discharges in power cables will generate small currents with low frequencies in the ground cords. In cable PD online monitoring systems, CTs are usually used to obtain such PD signals. In this paper, by derivations based on theories of wave propagation, the frequency characteristics of Rogowski CTs (RCTs) and the effects of transformer parameters (size, core material, etc.) on its pass band B, sensitivity H(jω0), the lower cutoff frequency fL is acquired. The feasibility of such derivations is verified by experiments. By conducting comparative experiments, the effect of the use of screening box and the way of coil winding on the performance of a current transformer is acquired. A feasible plan to improve the frequency characteristics of CTs is presented, in order to acquire more stable gain and better anti-interference ability within their pass band.
Performance Study of a Solar Adsorption Refrigeration System
Authors: Liu Yan Ling , Shi Xue Zeng
Published: December 2013

This paper presents the simulation of a solar-powered continuous adsorption air-conditioning system with the working pair of silica gel and water. In order to make the adsorption system more suitable to use solar energy to supply cooling continuously during daytime, a new adsorption system without refrigerant valves is being developed in SJTU recently. By using this system, the problem such as pressure drop along refrigerant circuit can be resolved. The frequent switches of refrigerant valves can also be omitted. The daytime long simulation results (ranging from 6:00 to 18:00) demonstrate that the solar-powered adsorption system can supply a fairly steady cooling output all the time. Based on the results, parametric study is also undertaken to optimize the design.
Researched on the Characteristics of Self-Excited Induction Generator
Authors: Chen Wei Min , Qi De Zhi , Xie Nan , Cai Hui
Published: December 2013

Micro-hydro as a new energy technology, has good prospects for development.On some occasions which dont control, the generator usually choose self-excited induction generator.The paper presents a method which the asynchronous motor can instead of the induction generator, and calculate compensation capacitance of the self-excited induction generator. Finally,this paper verified by experiments, which the changes of the output voltage and frequency and the changes of harmonic by changing the resistive load, when the asynchronous generator open-loop runs. The results show that,this method has feasibility and validity.
Improving the Transfer Efficiency of a Wireless Energy Transfer System Using Multiple Coils
Authors: Hui Hon Tat , Pu Shi , Loong Marcus Choo Ann
Published: December 2013

This study is to suggest using multiple transmission coils to improve the energy transfer efficiency of a wireless energy transfer (WET) system which aims to power electronic appliances such mobile phones, labtops, iPads, etc, without using cables. The original WET system consists of a large room-size transmission coil transferring energy wirelessly to a small receiver coil built insider an electronic appliance. The newly proposed system is to replace the single transmission coil with 3 orthogonally aligned transmission coils. The aim is to create a multi-oriented magnetic field so that energy transfer efficiency will be relatively more stable when the receiver coil changes in orientation. Our simulation results show that at some worse-situation orientations of the receiver coil, the increase in transfer efficiency is many folds, from 0.4% in the worse situation to a 2.75% after using the multiple-transmission-coil method. This, to some extent, safeguards the wireless charging process from a large power drop to a much smaller power drop during possible random motions of the receiver. But, on the other hand, the improvements obtained from the proposed system in the normal high-efficiency situations are not very significant.
Characteristic Analysis of the Magnetic Field Induced by Ocean Waves and the Filtering Method in Marine Magnetic Survey
Authors: Zhu Xing Le , Xiao Chang Han
Published: December 2013

The filtering method is proposed to diminish magnetic interference caused by ocean waves in marine magnetic survey. Variation characteristic of waves magnetic field about height and wind speed is analysed. Because waves magnetic field has similar frequency band with ships magnetizing field, wavelet packet transform is used to diminish the disturbing effect of wave. Simulation result indicates that the magnetic interference is removed effectively and ship magnetizing filed can be got in high precision, thus the method has great guiding meaning for practical marine magnetic survey.
Feedback Linearization Controller for MMC-HVDC System Connecting to Passive Networks
Authors: Xu Wei , Zhang Xue Long , Li Wei Guo
Published: December 2013

Compared with traditional voltage-source converter (VSC) in low level topology, modular multilevel converter (MMC) is suitable for supplying passive networks. A stable and well controller is important to ensure the high quality power supply to passive network connecting to MMC. In this paper, a double closed-loop controller containing an inner current loop and an outer voltage loop is designed for the rectifier station. The feedback linearization controller is adopted in the inner current loop, which is much simpler and better than the traditional PI controller. And a constant AC voltage controller is designed for the inverter station. The performance of the proposed controllers under different operation conditions are simulated in PSCAD/EMTDC. The simulation results show that the proposed controllers can ensure MMC-HVDC system provide highquality power supply to passive networks.
Control of Grid-Side MMC for Wave Power Generation
Authors: Fang Hong Wei , Chu Hui Min
Published: December 2013

The mathematical model of grid-connected wave power generation system based on modular multilevel converter (MMC) is deduced with topology structure and the operation principle of the MMC analyzed in this paper. Then the corresponding current decoupling control strategy is obtained in dq coordinates. Simultaneously, averaging voltage control and voltage balancing control are used to control the MMC to solve the imbalance and the ripple of the capacitor voltage of sub-modules. Moreover, the double closed-loop control strategy is used to control the grid-side MMC. Finally, the simulation model of grid-connected wave power generation system based on MMC is built in Matlab/Simulink. The simulation is carried out to verify the effectiveness and feasibility of the proposed control strategy.
Design of Intelligent Greenhouse Control System Based on PSoC Platform
Authors: Cui Rui Xue , Shuo Li , Zhang Xiao Rui , Li Tong Fei
Published: December 2013

This paper mainly introduces a new design about intelligent greenhouse control system based on system on a programmable chip, which is PSoC. This paper first introduces the current advanced characteristics of this system on a programmable chip PSoC with digital and analog mixed processing ability, and then focuses on the system structure, working principle, the realization of hardware module and software design method of the intelligent greenhouse control system based on PsoC platform.
The Study of Knowledge-Based Active Learning Grid Operation Experience
Authors: Zhou Qiang Qing , Liu Jing , Zou Qing Nian , Huang Guo Lin , Han Ping , Xu Yan
Published: December 2013

By using of the object-oriented technology and the knowledge representation of the production rule, this paper classifies the operation experience of grid according to the nature and builds a power grid operation experience knowledge base with active learning capability. Through application of Bayesian classifier model based on weight, it classifies the statistical data and identifies the semantic, to realize the exchange between the knowledge base and the users feedback. Using the powerful learning ability of knowledge base, it can make the operation experience knowledge base optimize its knowledge system structure while exchanging with users feedback, so that it can go on refining the operation experience base of the grid. This method can provide technical support and improve the quality of the stuff, as well as strengthen the security and stability of the grid.
A Simulation Framework for Grid-Consumer Interoperability
Authors: Tian Jian Wei , Chen Hai Hong , Li Zhi Zhong , Duan Wei
Published: December 2013

As distributed energy increasing, grid-consumer interoperability (GCI) is becoming a core characteristic of smart grid. Basically consumers behavior is fuzzy and adaptive, which causes difficulty to simulating interoperability. To deal with the difficulty, a GCI simulation framework and corresponding response algorithm are proposed, and thus consumers adaptive behavior could be simulated by fuzzy inference. Simulation on IEEE-14 bus test system demonstrates the validity of the simulation framework and the response algorithm proposed.
The Research of Optimization Method of Distribution Maintenance
Authors: Shen Xue , Li Ran
Published: December 2013

A scientific, rational, and practical maintenance plan helps to improve the reliability of power system. To avoid duplication of power outages and reduce unnecessary power outages, a suitable model of the network maintenance was established , considering the importance of facilities. Then, because of the defect that the pso is easy to fall into local minimum at the late iterations, an improved algorithm agpso was proposed. Finally, by means of analyzing an example, the feasibility of the model and the correctness of the algorithm were both proved.
Ergonomics in Universal Design
Authors: Yan Shi
Published: December 2013

Based on the characteristics of Universal design as the starting point, introducing the theory of Ergonomics, the universal design is divided into three types: special design, stable design and adjustable design. And through the concrete product design case to explain the design process, make the public more humanized design.
Multi-Objective Optimization of Manufacturing Workshop Layout Based on Improved Genetic Algorithm
Authors: Tang Bi Hong , Zhang Zhi Xia
Published: December 2013

A good manufacturing workshop layout can influence the profit of the manufacturing enterprises after the product coming on stream. Facility layout of workshop is a combinational optimization problem. The multi-objective optimization model which integrates the available problem of facility layout of workshop is established. Adaptive Genetic Algorithm is presented because of the disadvantage of simple Genetic Algorithm in solving this model. This algorithm use the adaptive crossover and mutation strategy which is used to nonlinear processing for crossover rate and mutation rate, then crossover rate and mutation rate are changed with the colony adaptation degree of each generation. It has some advantage, such as higher search speed, higher convergence precision, and so on. Finally an example is used to show the effectiveness of the method.
Variable Speed Control and Programming of Stepper Motor in Numerical Control System
Authors: Xi Wang , Sun Yang
Published: December 2013

When Stepper motor was running at high speed, it often appears out of step phenomenon. For numerical control system can control feed pulse frequency by best way, two variable speed control method and programming are analyzed in this paper. There are uniform accelerated (decelerate) and variable accelerated (decelerate), and they can done change speed process automatically by software.
Dynamic Process of Quality Abnormal Pattern Recognition Based on PCA-SVM
Authors: Liu Yu Min , Zhang Shuai
Published: December 2013

Quality abnormal pattern recognition for dynamic process is the key problem to achieve the online quality control and diagnose of automatic production. In the practical applications, there are some existing problems such as computational complexity and low recognition accuracy. A recognition method for quality abnormal pattern of dynamic process with PCA-SVM was proposed. This paper proposes a feature selection technique that employs a principal component analysis, to avoid this information loss. Then, the extracted features were treated as input vector for SVM classifier, following a particle swarm optimization algorithm is proposed to improve the generalization performance of the recognizer. Simulation results show that the proposed algorithm has very high recognition accuracy and high generalization ability. It is significant for quality monitoring and diagnosis in manufacture dynamic process.
A Model of Adhesive Contact between a Spherical Tip and a Flat Surface
Authors: Fan Kang Qi , Xu Chun Hui , Chao Feng Bo
Published: December 2013

There have been increasing research interests in the measurement of the mechanical properties of nanoscale materials by pressing a spherical tip into surfaces of the tested materials. To acquire a better understanding of this process, a model of adhesive contact between a spherical tip and a flat surface is developed by employing the Hamaker hypotheses and molecular dynamics (MD) method. With this model, the deformation characteristics of the tested surface are illustrated by the key snapshots of the deformed surface and the corresponding curves of pressure distribution. The results indicate that the contact can be formed before the tip impresses into the surface. Moreover, the variation of the adhesive force with the distance is recorded during the approach and separation processes, and the adhesion hysteresis is demonstrated by the force-distance curve. Additionally, the stepwise increase of the contact radius with a decrease in the distance is revealed and investigated.
The SIP Security Communication Base on Improved Key Agreement Algorithm
Authors: Fan Ya Qin , Zheng Kai Yuan , Pu Zhi Bo , Zhang Xin
Published: December 2013

This paper proposed a SIP security communication mechanism base on SAKA algorithm, combined with the identity authentication and key negotiation. This paper illustrated the communication process design steps and the SIP mechanism, and theoretical analysis of the safety performance of the mechanism. Through the network simulation platform to simulate the efficiency of the proposed scheme and compare with other authentication mechanism.
Design of Multiple Hetegenous Protocols Conversion of Home Gateway Based on Task Description
Authors: Wu Chuan , Zhou Zhi Ping
Published: December 2013

The disunion of communication protocol standards at present creates a huge barrier against the interconnection and interoperability of heterogeneous devices in home. To solve this problem, a method of multiple protocols conversion of home gateway was proposed to integrate a variety of heterogeneous protocol networks. Firstly, a new task description language based on ClassAD was designed to describe different heterogeneous devices for communicating each other in home networks. And a plug-in expansion mechanism was introduced to improve the scalability of heterogeneous protocols and the throughput of home networks system. As a result, the ability of semantic interoperability of heterogeneous devices is achieved to integrate new applications and drivers into the deployed intelligent home system during runtime based on the proposed home gateway.
Research on Edge Detection Technology
Authors: Dong Yu Bing , Li Ming Jing , Wang Hai Yan
Published: December 2013

Edge detection is an important field in image processing. Edge detection is in the forefront of image processing for object detection, it is crucial to have a good understanding of edge detection techniques. Various image edge detection techniques are introduced. These techniques are compared by using MATLAB7.0. The qualities of these techniques are elaborated. The results show that Canny edge detection techniques is better than others.
Study on Pulse-Signal Detection Methods Using Wavelet Transform and Hilbert Huang Transform
Authors: Wang Yan Fang , Guo Guang Ling , Li Zhi Qiang
Published: December 2013

The practical wrist pulse of the healthy person and the coronary heart disease patient were analyzed by wavelet transform (WT) and hilbert huang transform ( HHT), and the characteristic information (percentage of energy density) of the pulse signal was discussed. The simulation results show that both WT and HHT are efficient ways in analyzing and processing pulse signal, and can draw main characteristic information from pulse signal. However the basis function is preselected in WT, it doesnt need to be preselected in HHT. In HHT the intrinsic mode function (IMF) is obtained by empirical mode decomposition (EMD), it can reflect the instantaneous frequency of pulse signal, and has the actual physical meaning. The resolving power of time and frequency in WT is restricted by Heisenberg uncertainty principle, and is restricted by each other. While the resolving power of time and frequency in HHT is adaptively changed according to signal intrinsic characteristics. The HHT is more adaptive than WT in analyzing pulse signal. The HHT can offer a new idea to diagnose cardiovascular disease by wrist pulse signal.
Triple Wronskian Representation of the Multi-Soliton Solutions for a Coupled GMNLS Equations
Authors: Wang Lei
Published: December 2013

In this paper, we mainly extend the notion of the Wronskian to a coupled GMNLS equations. Based on the N-fold Darboux transformation (DT), we present the triple Wronskian representation of the multi-soliton solutions for the coupled GMNLS equations. Di erent fromthe previous method, the triple Wronskian solutions can be obtained from the N -fold DT without substituting it into the bilinear equation. A signi cant advantage of such method is that it avoids guessing the Wroskian representation and Wronskian condition. Our approach could be applied other soliton equations with 3×3 spectral problems.
Research on Intelligent Regulation of Ship-to-Ship Crude Oil Transfer at Sea Based on Internet of Things
Authors: Bao Xiong Guan , Wang Fang , Zheng Peng Jun
Published: December 2013

Ship-To-Ship (STS) crude oil transfer at sea is an operation where crude oil is transferred between seagoing ships moored alongside each other. Due to the complex sea conditions and the poorer lightering facilities compared with the port operations, the risk of oil spill is higher. This paper analyzes the existing regulatory systems for STS crude oil transfer in China and identified areas for improvements. An intelligent regulatory system for STS crude oil transfer at sea is proposed based on the cutting-edge technologies of the Internet of Things, which aims to improve the management quality of STS crude oil transfer at sea and effectively reduce possible losses caused by accidents.
Post Bifurcations of the Concept of the Sustainable Development in Construction Business and Education
Authors: Borkovskaya Victoria G.
Published: December 2013

Development of construction sciences and construction education in Russia passed a bifurcation point in communication to what there is a high-quality reorganization of all system. What potentials are expedient for integrating into the forthcoming period of development of science and education in construction What partners are necessary to construction science and education in the forthcoming period And, at last, what innovations will be demanded in the forthcoming period The author offers the vision of answers to the put questions.
Research on Innovative Performance Model of the Productive Service Industry Cluster Based on the Process of Network Innovation
Authors: Xu Liang Hu , Gao Yanan , Cao Ming
Published: December 2013

In this paper, from the perspective of network innovative process, we come up with the index system about the innovative performance evaluation of the productive service industry cluster and the basic assumption of this article based on the literature review. On this basis, we build a model to evaluate the innovative performance of the productive service industry cluster, thoroughly elaborate the process of network innovation Within the cluster and the mediating effect of absorptive capacity between process of network innovation and the innovative performance of the productive service industry cluster, therefore, through the normative research about the relationship between the process of network innovation and innovative performance of the enterprises within the cluster, we can effectively evaluate the innovative performance of the productive service industry cluster of China, and also promote the sustainable development of the cluster.
Research on the Influence Factor of the Value Chain Analysis by ICA
Authors: Zhang Zhong Ming , Guo Ning Juan
Published: December 2013

This paper introduced the ICA theory in the process of analyzing the entrepreneur mental factors which affect the value chain, and analyses the feasibility of applying ICA theory in the extraction of the entrepreneur mental factors. In the empirical study, we separated the main factors influencing value chain by the FastICA algorithm based on ICA theory, and the experimental results are in conformity with theory.It is feasible to sift Entrepreneur mental factors,the research results of this paper also provides a theoretical reference for the application of the ICA theory in value chain management and optimization.