bluuebunny/crossref_metadata_2025 huggingface dataset:
Structural Phase Transition and Electronic Properties of MgCe under High Pressure from First-Principles Calculations
Authors: Liu Qiu Xiang , Lu De Ping , Zhang Rui Jun , Lu Lei , Xie Shi Fang
Published: July 2014

The structural stability of MgCe under high pressures has been investigated by using the first-principles plane-wave pseudopotential density functional theory within the local density approximation (LDA). The obtained results predict that MgCe in the Ba structure is predicted to be the most stable structure corresponding to the ground state, because of lowest total energy. MgCe undergoes a pressure-induced phase transition from the Ba structure to B32 structure at 36 GPa. And no further transition is found up to 120 GPa. In addition, the electronic structures of four structures of MgCe are also calculated and discussed.
A Metadata Management Mechanism Based on HDFS
Authors: Chen Xiao Feng , Lou Yuan Sheng , Hu Dong Mei
Published: July 2014

A metadata management mechanism on the basis of HDFS was proposed in this paper, which is applied for cloud storage. The basic unit of consistent hashing is DHU in the scheme. Metadata is distributed in multiple servers in this solution, and the position of metadata is recorded in a mapping table. In addition, prefetching strategy and local cache technology are used to improve the performance of the system. Operation logs and Multi-Paxos algorithm are being used to ensure system’s reliability and consistency. Improved system with a lower latency in reading and writing than the original system was seen in the experiments. Good performance for cloud storage system can be shown by this system.
Analysis and Evaluation of HEVC
Authors: Wang Jian Jun , Zhou Li , Sun Tao
Published: July 2014

HEVC video coding standard is the next generation of H.264 coding standard, which is able to achieve twice coding efficiency compared with H.264/AVC High Profile. This paper analyzes the key features of HEVC standard based on HEVC reference software HM12.0. Experiments cover different resolutions ranging from 240p to 1600p. The most complex parts of HEVC decoder are intra prediction, loop filter and inverse transform when video sequences are coded with all-intra configuration. When video sequences are coded in random-access configuration, HEVC decoding process is occupied by motion compensation, which takes nearly half of the decoding time. Experiment results indicate that HEVC standard can achieve 50% average bit-rate saving compared with H.264.
Automotive ECU Software Design Based on AUTOSAR
Authors: Wang Chun Jie , Ge Le , Lee Tian Yong
Published: July 2014

Aimed at the defects and deficiencies of traditional automotive ECU (Electronic Control Unit) development methods, AUTOSAR as a new standard for automotive software development makes the software development process simplified greatly. The existing AUTOSAR development tools are studied and compared in this article to analyze of their respective characteristics, and an ECU software design scheme of the system is summarized according to the methodology. The research results prove that AUTOSAR can raise the development efficiency and software portability.
Implementation of Shading Techniques Based on OpenGL
Authors: Wang Zheng Ju , Chen Ming Rui
Published: July 2014

Shading can smooth the appearance of polygons by reducing the effects of sharp edges, which makes drawn graphics more realistic. Consider factors related to the object surface brightness, analyze and compare several shading algorithms, focus on presenting spherical linear interpolation of the Phong shading, and use OpenGL to realize the procedures and effect diagrams of Flat shading and Gouraud shading in VC + + environment.
Path Optimization Based on City Intersection Turning Analysis from Floating Car Data
Authors: Wang Zhi Qiang , Kan Zi Han , Hong Jun , Huang Fang Zhen , Tang Lu Liang
Published: July 2014

Intersection is the bottleneck of city traffic and the major contributing factor to traffic delay, which has a great impact on path selection. This paper first analyzes and models the turning characteristic at typical intersections, then discusses the analysis result of typical intersections in Wuhan city based on floating car data, and finally verifies the influence of intersection turning characteristic on path selection and optimization.
The Application of RFID and Video Fusion Recognition Technology in Road Congestion Charging System
Authors: Zhang Zi , Hu Yu Cong , Zhang Chuan Chun , Chen Yun
Published: July 2014

Vehicle automatic identification is a key technology in the road toll system, which mainly uses vehicle radio frequency identification technology or license plate recognition technology based on video at presently. While Independent RFID technology and video recognition technology all have their advantages and disadvantages, this paper presents that fusion recognition technology of RFID and video can be used in road toll system, and D-S evidence theory was selected as the basis for the fusion of RFID and video, the model of RFID and video integration based on D-S was introduced. The fusion recognition technology will help improve the accuracy of vehicle identification.
3D Visualization of Coal Seam Gas Distribution State
Authors: Cheng Gen Yin , Feng Shan , Cheng You
Published: July 2014

The monitoring of gas distribution state of coal seam could efficiently prevent gas accidents in coal mine, but the currently researches are mostly focus on qualitative assessments. Through the three-dimension character analysis of gas distribution state of coal seam, we could build a three-dimension model of gas distribution state of coal seam, and then make its visualization through the simulation of computer. It makes the gas distribution state of coal seam more intuitive. This study could make the analysis of gas distribution state more scientific and provides a three-dimensional visualization platform for the prevention and control of gas, reducing gas accidents.
Preparation and Effect of Heat Treatment Temperature on the Crystal Phase of Anodic Aluminum Oxide Films
Authors: Liu Xiao Zhen , Yan Xiao Hui , Wang Gang , Liu Xiao Zhou , Chen Jie , Zhu Yi Chen
Published: July 2014

The anodic aluminum oxide (AAO) films were prepared by anodization method from the 15 vol. % sulphuric acid solution, and prepared AAO films were heat-treated in the ranges of 25~1000°C. AAO films were characterized by EDAX, SEM and XRD techniques, respectively. The crystal phases of prepared AAO film is amorphous. The apertures of AAO film are in 25~30 nm. AAO films are amorphous when heat treatment temperatures of AAO films are below 800 °C. After the AAO film being heat-treated in the ranges of 850°C~900 °C, the heat-treated AAO film are γ-Al2O3film. When the AAO film is heat-treated at 950 °C, the part of γ-Al2O3change into α-Al2O3, and the heat-treated AAO film are mixed film of γ-Al2O3and α-Al2O3. After the AAO film being heat-treated at 1000 °C, the heat-treated AAO film is α-Al2O3film.
Research on the Deformation of Tunnel with the Influence of Seepage Water after Excavation
Authors: Li Jian Jun , Tang Fu Jiao
Published: July 2014

This paper discusses a tunnel whose entrance region is the main engineering background. Based on tunnel geological exploration report, we make the model. By establishing model and using numerical simulation software SIGMA/W and COMSOL to simulate the distortion in seepage condition, we find as tunnel excavation goes on, the pore water pressure of tunnel changes and it leads to infiltration of water in the tunnel, and the deformation of soil increases. The ground surface may sink if the evacuation goes on without taking actions, which is not safe for the buildings around. In case of this situation, the pore pressure of the tunnel around should be controlled from decreasing too fast. The result from our model is just like the result by monitoring measurement. The result shows the feasibility of software modeling in the prediction of tunnel seepage situation.
Study on Safety Monitoring and Forecasting of Qingping Tunnel Exit Based on Image Processing Technology
Authors: Nie Zhong Quan , Liu Yu Jie , Yao Hai Bo
Published: July 2014

In order to ensure the construction safety and schedule of Qingping tunnel exit, the paper forecast the geological conditions and abnormal prediction of the two holes in front of Qingping tunnel exit by using TSP, then according to the geological detection image data, combined with geological data and working face surrounding rock geological reveal theinte-rpretation. The results show that, the rocks of the Qingping tunnel exit is crushed, more karst structure is development and part of the underground water is rich, where potential safety hazard as gushing and collapse exists in the construction, should take corresponding measures as soon as possible.
A Study on Underground Engineering Monitoring Information System
Authors: Liu Yan , Liu Tao
Published: July 2014

In recent years, more and more attentions are paid to risk monitor and safety management technique due to the increasing underground engineering accidents. Compared to the rapid progress of underground engineering, the development of engineering risk management is backward. Engineering risk management has become a problem that must be solved in the first place to ensure construction safety. To solve this problem, a study was conducted on the safety issues encountered in Jinan underground engineering. In this paper, for the purpose of ensuring safety, reducing risk and controlling engineering quality, construction risk distribution disciplines were summed up while concept of safety and risk management was put forward.
A Method for Double Random Vibration Analysis
Authors: Liao Jun , Xu Da Fu , Jiang Bing Yan
Published: July 2014

A numerical procedure to compute the mean and covariance matrix of the random response of stochastic structures modeled by FE models is presented. With the help of Gegenbauer polynomial approximation, the calculation of dynamic response of random parameter system is transformed into an equivalent certainty expansion order system's response calculation. Non-stationary, non-white, non-zero means, Gaussian distributed excitation is represented by the well-known Karhunen-Loeve (K-L) expansion. The Precise Integration Method is employed to obtain the K-L decomposition of the non-stationary filtered white noise random excitation. A very accurate result is obtained by a small amount of K-L vectors with the vector characteristic of energy concentration, especially for the small band-width excitation. Correctness of the method is verified by the simulations.
Discussion on Sunflower Leaf Disease Diagnosis Based on Imaging Identification
Authors: Xu Hui , Lv Fang , Yue Xian Mei
Published: July 2014

This paper focused on three common diseases, respectively, bacterial leaf spot, black spot and downy mildew as research targets, developed and designed a system to diagnose leaf diseases of sunflowers based on image identification. The system used MATLAB as platform and developed the system by utilizing GUI tool kit. Passing several tests, the system was believed to be able to identify three types of sunflower diseases effectively, respectively, bacterial leaf spot, black spot and downy mildew. The results basically met the requirements set before the design of this system.
Equipment Design of Pollution Control
Authors: Wang Xiao Yan , Wang Jian Guo , Wang Chen Xi , Zhang Chang Jun , Deng Kai
Published: July 2014

Hubei Shiyan is the largest city in the source of South to North Water Diversion Project in China. The City District has 100 km of river, along cross-strait with high-rise buildings, dense population, and coverged sewage straight flow to the river. In our paper, the design of "Ming change dark" river closure project can fundamental solve the city environmental pollution problems, improve the source water quality without any menace from the "rear", and make Shiyan's green economy grow rapidly. On the other hand, this "city agriculture" new thinking will completely change the serious situation of arable land area which is decreasing year by year in the world.
A Study on Molecular Mechanics Analysis Flotation Collector in the Process Management Fluorite Tailing Mining
Authors: Song Ying , Wang Jin Hua , Jin Huo Rong , Hu Xiang Ming , Qi Min You
Published: July 2014

Recently, the natural mineral resources became short. In the process of fluorite floatation and tailing recycling, the key point is to find out collectors which have good selectivity to fluorite and effective inhibitor of gangue. Most reagents primarily come from agricultural byproduct and some chemical byproduct. However, the tailing mineral is complex and difficult to collect, which brought out accumulation of tailing mineral and water polluted. We try to modify the fluorite collector by use of computer-aided design drawing software and molecular mechanics curve between reagents and useful components in mineral and screen the best reagent. Interaction energy between drugs and fluorite surface is simulated and calculated by molecular mechanics at the atomic level. To determine that the interaction energy between collector and mineral simulated and calculated by molecular mechanics is helpful for demonstrating interaction mechanism. Finally, the better use of tailing mineral is good for environment pollution.
Research on Identifying Experts in Biomaterials Field Based on CiteSpaceII
Authors: Lou Yan , Zhang Shang , Huang Lu Cheng
Published: July 2014

Based on the original literature on biomaterials included in Web of Science between the year 1985 and 2012, this paper conducts the author co-occurrence and co-citation analysis, makes the high-frequency co-authors map and co-citation map, and shows the researchers distribution, with the information visualization software CiteSpaceII. By detecting the leading researchers in the biomaterials field, it helps the researchers to comprehend the research fronts and hot research topics quickly, identify classic literature efficiently, and write the literature review in their research activities easily. It provides the experts research direction to view related documents in the vast amounts of data. Moreover, the research result of this paper can provide a basis for relevant government departments to establish the expert database in the biomaterials field.
An Imbalance SVM for MicroRNA Target Genes Prediction
Authors: Chen Zhi Ru , Hong Wen Xue , Zhao Pei Pei
Published: July 2014

Imbalance miRNA target sample data bring about the lower prediction accuracy of SVM(Support Vector Machine). This paper proposes an SVM algorithm to predict the target genes based on biased discriminant idea. This paper selects an optimal feature sets as input data, and constructs a kernel optimization objective function based on the biased discriminant analysis criteria in the empirical feature space. The conformal transformation of a kernel is utilized to gradually optimize the kernel matrix. Through the comparative analysis of the experimental results of human, mouse and rat, the imbalance SVM with biased discriminant has higher specificity, sensitivity and prediction accuracy, which proves that it has stronger generalization ability and better robustness.
MicroRNA Prediction Based on Sample Classification Imbalance
Authors: Yang Ji Ping
Published: July 2014

MicroRNAs (miRNAs) play important regulatory roles in animals and plants by targeting mRNA for cleavage or translational repression. The main methods of predicting miRNA are biological experimental approaches and computational approaches. MiRNAs that have very low expression levels or that are expressed at specific stage are difficult to find by biological experiments. Computational approaches, especially machine learning approaches, can effectively overcome these difficulties. SVM (Support vector machine), which is one of the effective machine learning approaches, has a good performance on miRNA prediction. At present, the number of miRNA precursors that are experimentally validated is limited; however, the number of the sequence segment, which is similar to real miRNA precursors, is up to millions and millions. This caused classification imbalance when the samples are learned in the SVM. In this paper, the authors applied ensemble learning to solve this problem and achieve satisfactory performance.
Miniature Telemetry System for Recording Neural Action Potential in Freely Behaving Rats
Authors: Li Xiao Yan , Chen Xiao Bao
Published: July 2014

A miniature telemetry system for recording neural action potential in freely behaving rats is described. Together with the using of surface-mounted devices (SMDs) and radio telemetric technology, the telemetric device is suitable for recording neural potential in freely behaving rats. The device includes a headstage (including a microelectrode and a high impedance preamplifier), a backstage (including a main amplifier, RC-filters, a FM telemeter), a FM receiver, an oscillograph which can store the wave of the signals and a computer which is used to analyse the wave of the signals. A detailed printed-circuit layout will allow the system to be easily duplicated. So it can be easily generalized in other neuroscientists who are not familiar with wireless-transmission technologies.
A Method to Evaluate Low Voltage Supply System’s Reliability
Authors: Tian Shao Yu , Dai Gao Jie , Wang Peng Song , Li Hai Qin
Published: July 2014

The low voltage supply system’s reliability play an important role on improving equipment’s operation level and standards of management, this paper proposed a method to evaluate the reliability of low voltage supply system .The method was composed of four parts: statistical index system, definition of every index’s meaning and statistical formulas, confirming the statistical boundary conditions. In order to test the effective and practicability of the method, this paper evaluated the low voltage power supply’s reliability of BinZhou and the results are satisfactory.
The JIT Management Mode for Personalized Products
Authors: Wu Jian Hua , Wang Yue Han , Sun Ye You
Published: July 2014

For processing the personalized products’ parts under the JIT management mode, it introduces the JIT management mode, and elaborates the application of using the Heuristic Algorithm based on Non-delay Schedule to draw up a processing schedule of personalized products in the case of Job-shop. Combining with the manufacturing Rock-drill Machine’s sliding table, applying the Heuristic Algorithm to schedule the parts processing and optimizing it, making the Gantt chart. It can finally get the schedule to guide the manufacture.
Finite Element Analysis of Gear’s Stress Analysis Based on Accurate Model
Authors: Wang Lei , Tang Hou Xiang , Zhu Hua , Zhang Shao Jing
Published: July 2014

The paper established the accurately 3D-modeling of the gear by I-DEAS, and had correlative theoretic analysis and finite element computing technology study on its dynamics meshing structure strength with the contact finite element method. Then, accomplish model studied gear-stress in the process of Gear Drive. The conclusion is used to design an upgrade similar straight gear.
Negative Ten Decibels Method for Damping Identification of Light Damping Structure
Authors: Guo Zhi Wei , Sheng Mei Ping , Ma Jian Gang
Published: July 2014

Half power method is commonly used in structural damping identification because of its simplicity in algorithm. But when the damping is very small, half power method will lead a big error. In order to get more accurate result of small damping structure, this paper suggests using negative ten decibels method (N-10dB) instead of half power method. N-10dB method takes 10-dB bandwidth into consideration, differs from 3-dB of half-power method. The theory of this method is given firstly and proves that it is very simple in algorithm. Subsequent simulation and experiment show that, compared with half power method, N-10dB method have stronger noise resistance, higer precision and is more stable in repeated measurements. Except that, the N-10dB method is also practical in engineering test.
Study on Adhesion Property in the Process of Vibrating Compaction
Authors: Li Jia Qing , Xie Dong
Published: July 2014

In order to be convenient for engineering calculations, the relative experiment was designed after analyzing the reasons why the adhesion force on the front wheel of the single vibratory road roller changes in the process of vibratory compaction. According to the result of the experiment, a concept of effective adhesion coefficient is put forward and a calculation method of it is provided. Draw a conclusion that the utilization rate of adhesion coefficient is highest in two gear and hope that it has a positive effect on the parameter design of vibratory roller and engineering applications.
Study on the Thermal Characteristics Simulation and Error Compensation of Long Rail of Heavy Numerically-Controlled Machine Tool
Authors: Xiao Ming Yue , Hua Zhong Ping , Cheng Shui Sheng
Published: July 2014

In the working process of numerically-controlled machine tool, the generation of heat by friction between the guide rail and the workbench will cause the thermal deformation under the high temperature, which impacts on the machining accuracy of machine tool. Through the finite element modeling for the guide rail of machine tool by the ANSYS software, the thermal characteristics is simulated in the process of guide rail, then the main factors of thermal deformation is analyzed, finally the corresponding measures focusing on the error compensation is proposed.
The Analysis of the Effect of Structure to the Fouling Characteristic of Spiral-Grooved Tube
Authors: Yu Dan , Li Ran
Published: July 2014

In this paper, we carried out some experiments of different structures of spiral grooved tubes on fouling characters, experimental results show the varying curve of the fouling resistance of the spiral grooved tube with time. We also imitate and analyze the variation of the resistance of the spiral grooved tube with the geometric parameters. The conclusion shows that the geometric parameters of spirally grooved tube have great effect on fouling, with increase the groove depth and decrease the screw pitch, the fouling resistance of the spirally grooved tube decrease accordingly. Large groove depth and small groove pitch is the best designed structure of spirally grooved tube.
The Design and Analysis of Saw-Milling Working Head for Special Shaped Stone
Authors: Sun Jing , Zhang Ke , Zhao De Hong , Wu Yu Hou , Lu Feng
Published: July 2014

For a new type of saw-milling composite work-head, using the finite element method and modal analysis tests to get the dynamic characteristics analysis of the system. We have made dynamic parameters analyses which are mode shape, natural frequency and damping ratio of the whole machine and the piece structure of work-head, and identified the weak links of the machine. The research shows that: the composite work-head’ weaknesses are in the sliding saddle joint, and the vibration instability trend would drive the whole machine; the dynamic stiffness of spindle is lower in the low frequency band, and it causes a certain influence on the machining accuracy.
Virtual Prototype Modeling and Simulation of 8m Hydraulic Support
Authors: Wang Hong Wei , Dong Zhi Feng
Published: July 2014

The mechanism of four-bar linkage for the 8m hydraulic support is designed and optimized with the help of graphing method. The 3D model of the 8m hydraulic support is created using the software Solidedge. The virtual prototype is built in the circumstance of multi-body dynamics analysis software Adams. The dynamic simulation is made for the hydraulic support from the maximum working height 8 meters to the minimum working height 5 meters. The movement trail of the front point of the hydraulic support is obtained which can explain and demonstrate the performance of the four-bar linkage. Meanwhile, the displacement, velocity and acceleration curves of the gravity center for the major components including the top beam, shield beam, front link and rear link are discussed.
Construction of Contact Model of Wheelset Assembly Surface Based on ABAQUS
Authors: Xiao Jun , Zhou Kai Qiang , Zhou Ren , Lu Zhen Dong , Yang Meng Meng , Zhou Mo
Published: July 2014

In order to improve quality of wheelset assembly, a method for calculating interference between two sliding asperities that corresponding to the wheelset assembly interference is presented. A finite element model of sliding spherical asperity has been built with the finite element software ABAQUS to analyze the interaction among mating surface roughness, stress-strain state and press-fit curve. This study shows that final fitting force greatly increases with roughness when roughness is lower then 1.8μm and it is unpredicted when roughness is higher. Contact stress and friction coefficient between mating surfaces increase with roughness.
The Basic Research of Internal Combustion Engine Performance in Different Swirl Ratio
Authors: Jia Xiao She , Liu Yong Feng , Yi Li , Shi Yan
Published: July 2014

In order to investigate the effect of swirl intensity on the performance of the diesel engine, the 4JB1 diesel engine was taken as the research subject and KIVA-3V program was used to calculate the temperature, pressure, NOx and SOOT in cylinder and the performance of dynamic and economy of the diesel engine by changing the value of swirl ratio. The results show that increasing the swirl ratio in the cylinder can make the hybrid combustion of fuel and air sufficiently, improving the combustion temperature and pressure in the cylinder, enhanced the power of the diesel engine and reduced fuel consumption. The generation of NOx increased with the increases of swirl ratio and the production of SOOT decreased with the increases of swirl ratio.
Study on Parameters Matching of Air Suspension with Adjustable Auxiliary Chamber and Full Vehicle
Authors: Jiang Hong , Qian Kuan , Lai Ze Hao , Ju Long Yu
Published: July 2014

This paper presents a parameter matching method for the vehicle equipped with air suspension with adjustable auxiliary chamber, which is intended to improve riding comfort of vehicles. A bus model with eight degrees of freedom was established, which also includes air suspension with adjustable auxiliary chamber models and four road input models. The matching values of auxiliary chamber volume under different loads are obtained by analyzing the relationship with natural frequency of air suspension. The damping coefficients of front and rear shock absorbers are optimized by genetic algorithm under various driving conditions. The integrated performance of vehicle is improved to a certain extent after suspension parameters matching.
The Inversion Approach of Power Flow in Load Identification
Authors: Ma Jian Gang , Sheng Mei Ping , Guo Zhi Wei
Published: July 2014

A study about the structure load identification was made in this paper, based on the SEA power flow method. An inversion formula was firstly developed for the case that the load position is known. Using the formula, an algorithm was proposed to locate the source when the load position is unknown. A reference source must be chosen to utilize the algorithm. To make full use of the surplus data and to further improve the identification accuracy, the least square method was applied. Experiments about both cases were taken to validate the approach obtained above and it was shown that the approach is correct and effective. It is proved that the power flow inversion approach has some practical value in engineering.
Modeling and Analysis the Effect of Helical Carbon Nanotube Morphology on the Mechanical Properties of Nanocomposites Using Hexagonal Representative Volume Element
Authors: Le Minh Tai , Huang Shyh Chour
Published: July 2014

Carbon nanotubes (CNTs) are the ultimate reinforcing materials for the development of an entirely new class of composites. However, they have the complicated shapes and do not usually appear as straight reinforcements when introduced in polymer matrices. This decreases nanotube’s effectiveness in enhancing the matrix mechanical properties. In this paper, nanostructure having hexagonal representative volume element (RVE), theory of elasticity of anisotropic materials and finite element method (FEM) are used to investigate the effect of helical CNT morphology on effective mechanical properties of nanocomposites. CNT with different helical angles are modeled to estimate the nanocomposite mechanical properties. The results of helical nanotube models are compared with the effective mechanical properties of nanocomposites reinforced with straight nanotubes.
An Immune Fuzzy PI Controller for PWM Rectifiers
Authors: Shao Ze Long , Shi Ming Quan , Han Zhen Feng , Wang Xiao Dong , Li Qi Min
Published: July 2014

This paper presents a new control method for three-phase voltage source rectifier to achieve a good system output response. The design process of fuzzy immune PI controller was described in detail. Moreover, a simulation model was built by the matlab toolbox to prove that rectifiers based on immune fuzzy PI controller have better performance in respond speed, stability and robustness ability, compared with rectifiers based on conventional PI controller.
Based on Multi-Estimator Technology to Control Speed of Induction Motor
Authors: Feng Su Mei , Yan Zhi Ping , Wu Xue Mei
Published: July 2014

In order to improve the reliability of the control system, and to reduce the uncertainty of control process, this paper presents an excellent algorithm to control the induction motor speed using series estimator technology. The physical speed sensor is not used to detect speed of the motor, while applying the vector analysis method, through the stator current and the rotor flux are calculated to estimate motor speed. Corresponding to sensorless control drawbacks, the self-tuning control scheme is proposed through control scheme reformed. The double estimator technology is applied to reform scheme, the first order estimator is used to identify the system parameters, the second order estimator is used to calculate the parameters of the controller on-line, and control function is given real-time to control the speed of the motor, the simulation results show that the given control technology is advanced.
Control Algorithm Research Based on Heating System of Generalized Predictive PID
Authors: Li Bing Hao , Zhang Su Ying , Shen Yan Kai , Cui Wen Shuai
Published: July 2014

In the complex heating systems, higher order, large inertia, large delay and uncertainty typically exist. This work introduces generalized predictive PID control algorithm to adjust the system. The purpose of the control algorithm is to achieve a steady state in a shorter time. On the basis of analyzing PID control algorithm and Generalized Predictive Control (GPC), configuring a given performance function index control-weighted sequences to GPC control. Derived form of generalized predictive control algorithm with PID. The Matlab simulation shows that using generalized predictive PID control algorithm can produce better results in shorter time than simple using PID or GPC in the heating system.
Development of a Marine Self-Balancing Table with Two-Axis Motion Control System
Authors: Huynh Minh Phu , Huang Shyh Chour
Published: July 2014

The purpose of this research is to design and construct a marine self-balancing table with two-axis motion control system. This table has two degrees of freedom, is fixed in an ocean-going ship and can be self-balanced when the ship is moving in the sea. Control of the table is based on fuzzy logic control. A prototype of the marine self-balancing table is also manufactured in this research. Experimental results show that this table can be self-balanced with a tolerance of 10.
Experimental Study on Frictional Resistance Characteristics of CO2-Emulsified Viscoelastic Surfactant Fracturing Fluid
Authors: Jing Ze Feng , Wang Shu Zhong , Luo Xiang Rong , Wang Zhi Guo
Published: July 2014

Rheological properties and friction resistance properties of CO2-emulsified viscoelastic surfactant fracturing fluid were investigated on the large-scale test loop of foam fracturing fluid. When the velocity is below 2.8 m·s-1, the friction pressure drop gradient gradually decreases with the increase of foam quality, however, when the velocity is above 2.8 m·s-1, the friction pressure drop gradient of VES-CO2with higher foam quality is higher than lower foam quality. In addition, frictional pressure drop gradient of the pure CO2is higher than the VES-CO2fracturing fluid system when the velocity is more than 1.6 m·s-1. And frictional resistance coefficient decreases with the increase of foam quality and increases slightly with the increase of temperature. Experimental correlation between frictional resistance coefficient and Reynolds number is obtained and has high precision.
Research on Electronic Pneumatic Steering and Braking Control Technology for Autonomous Tracked Vehicles
Authors: Li Guo Qiang , Wang Xing Ye
Published: July 2014

To realize the autonomous driving of a certain tracked vehicle, the paper has a research on its steering and braking control technology. According to the steering and braking device’s structure and work principle on the original vehicle, the paper design an electronic pneumatic steering and braking control system before analyzing the design request of the system and introduce the system’s work principle. Applying this system to the original vehicle’s autonomous transformation, a test was conducted on the vehicle, the test prove that the electronic pneumatic steering and braking control system can well satisfied the tracked vehicles’ request of steering and braking.
The Information Fusion Technology of the Attitude Angle Based on the BP Neural Network
Authors: Lin Feng , Fan Sha Sha , Qu Xiao Guang
Published: July 2014

This article presents use the BP neural network to do the attitude angle Information fusion for the Attitude and Heading Reference System (AHRS). In addition, use the more mature BP neural network in a different Area. The algorithm has been applied to the attitude control of a small UAV.
Design and Analysis of Power Assist Elbow for EVA Spacesuit
Authors: Zhou Ming Lian , Hou Wen Guo , Xu Shu Hui
Published: July 2014

Based on pneumatic artificial muscle actuator (PMA) technology, a power assist device for the elbow joint actuated by a pair of antagonist muscles was designed. Dynamic models of the power assist device were established, driving characteristics of the device were simulated. The results show that the PMA complies with the requirements of the device, and the device can compensate the resistance caused by the spacesuit and the inertia forces by motion. Hence the device will be a great help for astronauts EVA operation. The research is used as a foundation for future development of power assist spacesuit.
Research on the 840D NC Machine Tool Production Process Monitoring and Management
Authors: Chu Le Ping , Xiao De Ming , Chen Zai Yu , Pian Cheng Rong , Wu Nan , Zhang Qing
Published: July 2014

According to the communication principle of 840D numerical control (NC) system and internal data structure, the PLC program is developed to make 840D system state data transmit to the PC with the MPI channels; production status data real-time monitoring system based on 840D NC machine tools is developed, meanwhile, the monitoring and data management for NC machine tool production process status is realized.
Calibration and Evaluation of Steering Wheel Torque Signal for EPS System
Authors: Sun Yu Kuan , Hao Wang , Duan Xiao Jie , Yuan Chen Hu , Wang Jian Ming
Published: July 2014

Electric power steering (EPS) uses an electric motor to assist the driver when he or she is driving, and the amount of assistance to be applied depends on steering wheel torque and driving conditions. So steering wheel torque is one of the most important signals which keep the EPS system working properly, and a steering wheel torque fault could be a disaster for whole vehicle security. The aim of this paper is to design a calibration and evaluation system of torque signal, which is utilized for function detection of steering wheel torque module in EPS systems. Firstly, the detection procedure is proposed according to detection requirement; Then hardware structure and software design of the detection system are introduced. Finally, an EMC (Electromagnetic Compatibility) problem is analyzed and a solution for the EMC problem is proposed to make the detection system working properly.
How to Get the Solar Direction from Skylight Polarization for Satellite Autonomous Navigation
Authors: Huang He , Zhou Jun , Liu Ying Ying
Published: July 2014

The solar direction is an important clue for satellite autonomous navigation. A new method for obtaining the solar direction from skylight polarization for satellite navigation is discussed. The new method is using two E-vector polarization sensors to get solar direction, and the view field of the polarization sensor is discussed.
Numerical Simulation of Borehole Heat Transfer with Phase Change Material as Grout
Authors: Wang Jin Long , Zhao Jing De , Liu Ni
Published: July 2014

Ground source heat pumps (GSHP) have been widely used in recent years. The heat transfer between borehole heat exchanger (BHE) and earth is the key factor impacting on the performance of GSHP. However, in order to setup BHE, a large amount of area of land is necessary, since the heat capacity of earth is limited. In this paper, phase change materials (PCMs) are used as grout instead of common materials. Thus, the heat capacity of soil has been improved, but the heat transfer characteristic of BHE has also changed. To prove its feasibility, the 3-dimensional numerical heat transfer simulation has been carried for three models which grout are respectively soil, PCMs, and PCMs with heat transfer enhancement measures. The characteristics of heat transfer and the land areas used of the three models are compared. The results show that the land area can be reduced effectively with PCMs as backfilling, while heat transfer enhancements must be adopted because the conductivity of PCM is small.
Microgravity Simulator Based on Air Levitation for Astronauts EVA Operation Training
Authors: Zhou Ming Lian , Hu Hao Chen , Xu Shu Hui
Published: July 2014

Because of the microgravity environment of the space and mobility restriction by pressurized spacesuit, astronaut extravehicular operation is quite different from that in the ground. For ensuring high reliability of extravehicular operations, the astronauts need to do a great deal of training in simulated environments. A 3-dof of micro-gravity operation training system is designed in the paper, and the kinematics and dynamics of the interaction between the space station system and spacesuit system were simulated. Pressure and flow velocity distributions in the air orifice and air cavity were calculated by FLUENT. Experiments on the bearing capacity characteristic were carried out. The carrying capacities of the air bearing in different air pressures were achieved. Experiments validated the simulation analysis. The research provides the basis for the development of multi-degree of freedom space microgravity ground simulation technology, provides a basis for further development and application of flotation technology as well.
Research on the Visual Self-Stabilization System of the Automated Guided Vehicle (AGV)
Authors: Wang Jing , Xi Zhong Yu
Published: July 2014

In view of the unstable phenomenon of the visual system of the AGV in the automatic system, the paper adopts the MEMS gyroscope MPU6050 to collect the status of the visual holder. We can guarantee the stability of the holder, obtain clear pictures and improve the operating validity of the vision-based guided AGV by controlling the brushless motor through the Arduino single chip microcomputer program.
Development of Retrieve/Storage Cabinets for Chemical Reagents
Authors: Zhang Hang Wei , Huang Jian Feng
Published: July 2014

To integrate chemical reagent retrieve/storage (R/S) device with management information system, an intelligent mechatronic system is developed. Three kinds of unit cabinets for reagent bottles are constructed. A Single-chip Microcomputer and a Personal Computer are served as a slave and host control system respectively. A set of special application software is programmed by VC++ and Access to accomplish reagent retrieve/storage, usage reports and surplus warning by short massage based on the Internet of Things. The integration of chemical reagent R/S device with MIS is realized which could make the storage device automation, data visualization and measurement precision.
Characteristics Analysis and Simulation of Self-Excited Single-Phase Induction Generator
Authors: Chang Wen Yeau
Published: July 2014

This paper presents steady-state characteristics analysis of a self-excited single-phase induction generator (SPIG) which supplies an isolated load. The self-regulated characteristics of a SPIG by connecting external capacitors are examined. The system consisting of both shunt and series capacitors in short shunt and long shunt connections to improve voltage regulation of SPIG has been analyzed. Based on two-phase symmetrical components equivalent circuit model, a fast iterative approach to simulate the operated state of a SPIG is developed. To demonstrate the effectiveness of the proposed approach, the approach has been tested on a practical motor-driven SPIG. Very close agreement between experimental and simulated results has been obtained.
Current Mode Maximum and Minimum Circuit
Authors: Wang Han , Zeng Yi Cheng , Li Zhi Jun
Published: July 2014

A new current mode circuit which can maintain the maximum output and minimum output at the same time is presented in this paper. The design technique is achieved by the combination of trans linear loop, winner take all (WTA) circuit and loser take all (LTA) circuit. Therefore, the proposed circuit can be more practical than conventional circuits and can be easily designed in 0.5 μm CMOS technology for CSMC. Analysis and simulations of WTA and LTA circuit have been shown to display the usability of the proposed circuit, where the input frequency range is around 10 MHz. The proposed circuit can also play a neuron role in artificial neural network (ANN) implemented in the form of an integrated circuit.
Characteristic of Porous Carbon Fiber and its Microwave Absorption as Filler for Composite
Authors: Li Yi Wei , Song Jian , Wei Jia Liang , Zhou Yang Bin , Li Guang
Published: July 2014

As a specific morphology, the porous carbon fiber was prepared through carbonization of polyacrylonitrile/polymethyl methacrylate (PAN/PMMA) blend fiber with the PAN weight of 70%. The morphology and crystalline structure of the obtained porous carbon fibers were investigated by SEM, XRD, and Raman. The obtained porous carbon fiber produced at carbonization temperature of 1000-1400°C as well as the solid carbon fiber were cut into millimeter size and used as fillers to add to epoxy in order to make composite with the weight of 6%. The complex permittivity of these composites was measured using a network analyzer. The results reveal that the cross section of obtained carbon fiber from PAN/PMMA (70/30) is full of pores with size of 0.1-1um. The graphite crystalline degree becomes high with increasing the carbonization temperature. The composite filled by the porous carbon fiber shows better microwave absorption than that filled by the solid carbon fiber, the lowest reflection loss is-24.5dB and the band width with reflection loss below-10dB is 1.9GHz as the porous carbon fiber is the filler. Among three carbonization temperature: 1000°C, 1200°C, 1400°C, the porous carbon fiber prepared at 1200°C gives the best microwave absorbing performance.
Design and Implementation of Digital Charger Based on Buck Converter and MPPT Technology
Authors: Fan Sheng Wen , Xue Hao , Wang Peng
Published: July 2014

Due to global environmental deterioration, photovoltaic (PV) system (i.e., solar panels) is becoming more common as a renewable energy source. So the rational use of renewable energy put forward higher requirements. This article will explain how to combine Buck converter and MPPT technology to optimize the process of solar panels while charging the battery. The article will analyze the working states of Buck converter. The combination of the application of MPPT technology and Buck converter will be clarified.
Research and Application of Energy Saving Technology of Inverter in Light Load
Authors: Zhou Jiu Yan
Published: July 2014

In order to analysis the variable-voltage energy saving theory and its implementation for induction motor with light-load in detail, This paper gives out a variable-voltage energy saving method, and discusses the design of variable frequency adjusting speed control and the points of attention. It is useful for the application of energy saving technology for induction motors.
Research on Mitigation of Low Order Harmonics in the Grid-Connected Single-Phase PV Inverter
Authors: Yang Li Yong , Liu Wei Peng , Wang Yong Tao , Wu Xiao Peng , Yang Yang
Published: July 2014

In this paper, a single-phase grid-connected photovoltaic (PV) inverter topology consisting of an H-bridge circuit, an inductive filter and a transformer interfacing the grid is considered. To improve the quality of the grid current and eliminate low order harmonics caused by the inverter’s dead time, a strategy of adaptive harmonic compensation method is proposed, and the parameters related are designed. The experiment results show that the proposed method has a good effect to mitigate low order harmonics and can improve the quality of current injected to the grid.
Study on Electrical Parameter Frequency of the Out-of-Step Oscillation Center
Authors: Yang Jian , Tang Fei , Liao Qing Fen , Wang Yi Fei
Published: July 2014

Out-of-step splitting is an emergency strategy to trigger splitting devices to separate power systems into several sub-regions through capturing oscillation center before the collapse of the system. How to position the oscillation center rapidly and accurately is a key procedure in out-of-step splitting field. This paper proposes a new method to position the oscillation center based on electrical parameter frequency. Firstly the current and voltage frequency variation characteristic of out-of-step tie line is analyzed. Secondly, the electrical parameter frequency variation rules are summarizes, i.e. curves of buses voltage frequency of the oscillation center line change continuously without intersection and they have the opposite variation trend. At last, the oscillation center can be positioned accurately within half out-of-step cycle by constantly monitoring electrical parameter frequency of the transmission tie lines. The accuracy and rapidity of the method are certified by the simulation results of four machine two regional power system.
The Vibration Characteristics of the Hydropower Plant with a Certain Cross Flow Hydro-Turbine Generating Units and its Earthquake Response Analysis
Authors: Ouyang Zhen Yu
Published: July 2014

To consider the safety of a certain cross flow hydro-turbine generating units and the hydropower plant, the finite element model of the plant and units are established by ANSYS, with which the resonance check is carried out. Meantime, the spectrum analysis method is used to present an earthquake response analysis according to the relative specifications, and the earthquake reaction condition in different directions of the characteristic monitoring points in main height is obtained, then the vibration characteristics of the hydropower plant and the effect of the earthquake load are analyzed. The research gives evidence and reference to make sure of the plant structure safety and the healthy operation for hydro-turbine.
Application of Lithium Iron Phosphate Battery on Electric Power Engineering
Authors: Chen Ping , Hu Xin , Shun Guang Qiang
Published: July 2014

This paper explores the application of. ithium iron phosphate battery in substation DC system. This paper analyzes the system configuration and the advantages and disadvantages of lithium iron phosphate battery, explores the feasibility and economy of the application of lithium iron phosphate battery in power grid, also summarizes the technical route of lithium iron phosphate battery and provides reference for design of new type of batteries adopted in substation DC system in future.