bluuebunny/crossref_metadata_2025 huggingface dataset:
Advances in Research on Left-Handed Met Materials
Authors: Ding Yu Bin , Zhang Guo Ping
Published: October 2011

Left-handed metamaterials, of which the dielectric constant and the magnetic permeability are sim-ultaneously negative , are a kind of electromagnetism materials. This paper gives a introduction to the basic principles of left-handed materials , and expatiates on the preparation ways of this materials in microwave region ,infrared region and visible light region.
Additives Applied for Preparation of Superfine Mg(OH)2 Particles by Light-Burned MgO at Low Temperature
Authors: Kong Qing Gang , Qian Hai Yan , Xiao Hui Ning , Liu Kai , Wang Jian Ke , Zhu Jing , Li Jun
Published: October 2011

Due to its buffer property, activity, absorbability and safety, magnesium hydroxide is widely used in environmental protection, pharmaceutics, pulp and paper industry, and as flame-retardant filling in composite materials. The hydrothermal synthesis of magnesium hydroxide at low temperature (< 100°C) needs only simple equipment and is environmentally friendly and energy-saving, so the process is promising and easy for industrialization. In this study, we have investigated the effects of hexamethylenetetramine and ammonia additives on the hydrating synthesis of superfine Mg (OH)2 particles at 70°C. Mg (OH)2 particles formed were of platelet shape and the mean diameter was approximately 200nm. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were applied to characterize the crystal phase, size distribution and morphology of the crystal particles. Different morphologies of Mg (OH)2 particles were formed in hexamethylenetetramine and ammonia solutions. The generation velocity of hydroxyl (OH-) was found to play an important role in the distribution and morphology of Mg (OH)2 particles.
Wrinkle Formation and Imprinting of Gold Film Deposited on Polydimethylsiloxane
Authors: Chang Zue Chin , Lin C.B , Ho Jin Shin , Yang Wen Hua
Published: October 2011

Bi-axial tensile stress was applied on a polydimethylsiloxane film and mounted on a PMMA plate surface. Then, the film’s tensile strain was fixed and the gold film was sputtered onto the surface. A wrinkle pattern was found during the release of tensile strain because of the friction effect between the PMMA plate and a polydimethylsiloxane film. A nickel stamp with a wrinkle structure fabricated using electroforming process and the polymeric wrinkle structure can be replicated successfully by electroforming and by imprinting process.
The Application of I2C Bus Digital Sensor in Airflow Measurements
Authors: Guo Yu Guang , Ren De Zhi , Xu Li Ping
Published: October 2011

The application of a new microbridge mass airflow sensor is presented. Based on the introduction of the sensor’s I2C interface principle, TI’s ultralow power consumption MSP430F5438 micro controller is used as core processor to design a measurement system which has a good low power consumption character. The performances of the system are examined by the experiments. The result of the experiments can indicate that the relative error of the system is less than3.5%, and the sensor has the characteristics of high accuracy, low power consumption, fast response, strong anti-interference ability, etc.
Dynamic Elasto-Plastic Analysis on the Steel Spatial Arch Truss with 30m Span and 0.2 Rise-Span Ratio
Authors: Li Hai Wang , Shi Yi , Liu Jing
Published: October 2011

In this paper, the elasto-plastic dynamic analysis on the steel spatial arch truss with 30m span and 0.2 rise-span ratio is carried out under earthquake action with SAP2000. In the analyses, the geometric and material nonlinear effects are considered at the same time based on the plastic-hinge theory. Under the action of EL wave with the peak increasing gradually, its elasto-plastic dynamic responses have been obtained. The results show that its failure mode under the earthquake action is elasto-plastic dynamic buckling; that its critical peak acceleration of EL earthquake wave when applied in X direction is 654gal, and is 1108gal when applied in Z direction; The ratio of its maximal node horizontal displacement and its structural height is 1/102, and its displacement ductility coefficient is 4.215 and the ratio of its bars with plastic hinge appearing when buckling is 15.54% when EL-Centro waves applied on structure in X direction; The ratio of its maximal node vertical displacement and its structural span is 1/994, and its displacement ductility coefficient is 1.338 and the ratio of its bars with plastic hinge appearing when buckling is 11.66% when EL-Centro waves applied in Z direction.
3D Rebuilding for Impeller of Centrifugal Pump Based on ICT
Authors: Jiang Xiao Ping , Shi Wei Dong , Li Wei , Liu Hou Lin , Tan Ming Gao
Published: October 2011

In order to rebuild 3D models for pump impeller, the total inner complex construction data must be obtained at first. With the help of ICT, 367 ICT images with high quality of two typical impellers of centrifugal Pump were collected respectively, and format conversion from RAW to BMP was fulfilled though a developed program. Volume rendering was fulfilled based on these fault images, VC++ 6.0, MFC, ADO, VTK, and a series of digital image processing. A program named ReImpeller3D was developed on reverse engineering for pump impeller. The software is object-oriented and has several input and output interfaces, and also can supply geometrical models for numerical simulation, FEM, RP, digitized production, and redesign to production either. The practical application shows that it is feasible to use volume rendering to rebuild 3D model for pump impeller.
The Research about the Inverse Kinematic of the Tricept Mechanism Based on Pro/Engineer
Authors: Huang Xiao Hua , Xu Jian Cheng , Dai Wei , Wang Chun Song
Published: October 2011

The mathematical modeling and the kinematic simulation of the Tricept mechanism are finished by using the Pro/Engineer software in this paper. On the basis of the movement trajectory of the end point of the mechanism, the inverse kinematic and the kinematic curve of the Tricept mechanism are get, which are the basis of the control about the drive mechanism. In the meaning time, under using the Pro/Engineer, it is possible for us to control the motion of the end-point of mechanism which moved on the tangential plane. In order to avoid the tool to shimmy, the cutting output is constant in the course of processing which improves the process precision of the complex parts and provides the feasible and effective method for us to process the complex aerospace parts.
Modelling and Simulation of Particle Breakage in Jaw Crushers
Authors: Zhao Li Mei , Chen Lun Jun , Zhang Da Bin , Li Yi
Published: October 2011

Jaw crushers are commonly-used machines in aggregate production. The aim of the research is to present a model which is able to predict particle size distribution in jaw crushers and to provide a new method for effectively controlling the quality of crushed product. The object of study was a domestic PEF 400×600 jaw crusher. A performance model was developed based on the standard mass balance formulation and chamber dividing results. Some important parameters that influence the particle output of the crushers were taken into account in the model. The variations of the particle size distribution resulting from changes in the eccentric shaft rotational speed and the parallel strip length were investigated.
Study on Dual-Loop Controller of Helicopter Based on the Robust H-Infinite Loop Shaping Method
Authors: Lang Zhe Yan , Wu Ai Guo
Published: October 2011

Helicopter is a typical MIMO system including the properties of non-stability, strong coupling, uncertainty. Firstly, a robust internal loop ACAH controller is designed and analyzed to ensure decoupling and robustness on each channel by the robust H-infinite loop shaping. Secondly, the external loop is designed using the classical PID method on the base of decoupling internal loop. Both loops contain the part of anti-windup. The simulation results of the prototype model demonstrate that in both time and frequency domain, the performance of the controller meets the design requirement with a comparative simple structure. The results can also prove that it has some effect against to the model perturbation and achieve LEVEL1 of ADS-33E-PRF.
Simulation Modeling of Dynamic and Flexible Scheduling about Large-Sized Components Producing Workshop Based on Cellular Automata
Authors: Chen Yong , Qiu Xiao Jie , Zhang Si Yuan , Lu Jian Sha
Published: October 2011

A simulation model of dynamic & flexible scheduling about the large-sized components producing workshop was built by using the cellular automata according to both sides’ characteristics. The scheduling system can be divided into 4 parts: work station, buffer, work piece, and scheduling rules. Work station and buffer were viewed as fixed grid nodes, work piece as moving particles, scheduling rules as the local self-evolution rules which include station choosing rule, work piece sequencing rule and task activating rule. Model simulate the job scheduling of a certain generator components producing factory workshop.
A New Real-Time Position and Orientation Tracking System for Endoscopy
Authors: Liu Li Kun , Ouyang Zi Zi , Wang Sen , Wang Yi , Chen Xiao Dong , Yu Dao Yin
Published: October 2011

A New real-time position and orientation tracking system for endoscopy is described. Three coils sequentiallyfed with current comprise the excitation source which will produce magnetic field. According to Biot-Savart-Laplace law, flux intensity data detected by three-axis magnetic sensor could be interpreted into information that will reflect the sensor's specific position, thus realizing the position determination. Also, data detected by the magnetic sensor and gravity sensor changes in connection with the spatial angles. By researching the change law between the two, spatial angles of the sensor is calculated, thus realizing orientation determination. It is shown errors in position determination is,errors in orientation determination is , the tracking frequency of the system is 10 Hz.
Realization of Two-Axis Macro-Micro Dual-Driven System
Authors: Fei Fang , Bai Xiao Long , Ju Bing Feng
Published: October 2011

Macro-micro dual-driven technique is an effective method to realize motion control of long-stroke and high-precision. The basic line is that micro feed stage compensates the error of macro feed stage measured by displacement sensor in order to decrease system error and improve positioning precision. This paper sets up two-axis macro-micro dual-driven system consisting of planar axis motor and piezoelectric ceramics actuator. The planar axis motor realizes coarse feed and piezoelectric ceramics compensates motion error. Flexure hinge is adopted as micro transmission mechanism to avoid noize, friction and gap. By adopting Digital Signal Processor as the controller, the compensation can be seen as synchronous. The experimental result shows the error of this system is under 200nm.
Contact Stress Analysis of Multilayered Strands
Authors: Zhao Xin Ze , Peng Wei , Zhang Shao Qing , Yang Ming Song
Published: October 2011

The calculation method of contact force in contact-zone between adjacent layer wires has been analyzed. The principal radii of curvatures of wires were taken into consideration while obtaining the analytical expressions for contact stesses and sizes of contact surface. Meanwhile, a formular for shear stress of arbitrary point in half-space under contact-zone was derived on basis of the Boussinesq problem and it was simplified by using Gaussian quadrature. According to the results, the stress distribution could be unsderstood more thoroughly and the results is of great importance for studying looseness, fatigue and fretting wear of multilayered strands.
Nanometer Titanium Dioxide Powder Preparation and its Performance
Authors: Yan Shao Feng , Xiong Xiao Hang
Published: October 2011

F-doped TiO2 by hydrothermal synthesis method is prepared in this paper. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), infra-red (FT-IR) and diffuse reflectance spectroscopy (UV-vis). The photocatalytic performances of the samples were estimated by degrading Rhodamine B. which indicates that the reaction of photocatalytic degradation of Rhodamine B follows the zero order kinetic law. The photocatalytic performances are increased by F-doped. And F optimum doping dosage is 2.0%. After calcination at 500°C, the photocatalytic performance of the sample has not been obvious improved.
Analysis on Efficiency of Power Generation for Various Sun Tracking and Fixed Solar Cells under Different Sunshine Environment
Authors: Wang Chang Chun , Lin Kuang Jang
Published: October 2011

Solar energy directly converses light energy into DC power without fuel, no moving parts, no pollution, and no noise with long life-span more than about twenty years. Its application is extensive and the set up of solar generation can be scattered and in a small amount on demand which is the most available of all renewable energy, and is the most practical and effective energy. There are many kinds of solar cell, such first generation as Mono-crystalline Silicon, Multi-crystalline Silicon, and Amorphous Silicon, the second generation as Film Photovoltaic and the third generation as Dye-Sensitized (DSSCs) etc. The utilization of solar energy is greatly influenced by environmental change with the main reason of solar radiation. This research collects the data from the test of Mono-crystalline Silicon, Multi-crystalline Silicon, and Film Photovaltaic solar cells in different solar radiation, and then conducts the analysis and research thereby. Using the program written by Labview, collect the data of voltage, current, and the power, solar radiation, and temperature emitted by solar cells under test for analysis. And then discuss the results of the collected data by Matlab for data analysis.
Comparative Analysis of Heat Transfer Characteristics for CO2 and Conventional Refrigerants
Authors: Yang Jun Lan , Ma Yi Tai , Li Min Xia
Published: October 2011

s: The obvious characteristics of transcritical CO2 cycle are that the heat rejection process takes place in the supercritical region (about 8-12Mpa). The heat transfer features of CO2 under supercritical pressure are different from those of the conventional refrigerants. And the heat transfer performances comparison study for supercritical CO2 fluid and the conventional refrigerants are carried out by means of thermo-physical properties analog analysis and experimental results quantitative comparison. The special properties variation of supercritical CO2 fluid makes its heat transfer performance different from the conventional fluids. From the view of properties analysis and quantitative comparison, the heat transfer performance of supercritical CO2 is equivalent to the condensation heat transfer of conventional refrigerants. Although the condensation coefficient is very large since there is phase change and latent heat variation in the condensation process, there is liquid film thermal resistance. While in the supercritical CO2 cooling process, there is no liquid film in existence and the thickness of the boundary layer is very thin. The heat transfer temperature difference is very large, so the heat transfer performance in the supercritical CO2 cooling process is equivalent to that of the condensation heat transfer.
Energy Factor Analysis in Modular Product
Authors: Ke Qing Di , Zhang Hong Chao , Liu Guang Fu , Li Bing Bing
Published: October 2011

Nowadays, due to the huge energy consumption, the energy-saving problems of the product have been emphasized with many designers. In this paper, informed by the modular design method, the total energy performance in modular product can be analyzed and separated into the energy performances of basic modules. And with the physical analysis of basic modules, the energy equations are established with the band graphs theory. Then, the physical parameters, which could influence the energy consumption, are identified as “energy factor”. Thus, the energy consumption of the modules could be optimized with adjusting design factors, and the energy-saving design scheme for the whole product is obtained in the optimized model. Finally, the model and the method in this paper are demonstrated by an instance of the crank block pump.
Study of Structure and Optical Properties of Magnetron Sputtered ZnS Thin Films by Annealing
Authors: Chen Rui Fang , Yu Jie , Hua Yin Qun , Xu Rui Li , Liu Hai Xia
Published: October 2011

Nanocrystalline ZnS thin films were deposited on glass substrates at 300W and 0.6Pa by using radio frequency magnetron sputtering, and then annealed at different temperatures. This work investigated the influence of ZnS buffer layer on different annealing temperature, analysed structural, surface topography, and optical properties of ZnS films by using X-ray diffraction (XRD), UV-spectroscopy measurements and scanning electronic microscope (SEM) analysis techniques. Findings showed that the film annealed at 300°C was uniformity and compact, which was zinc blende cubic structure. The film exhibited the optical transparency as high as 85% in the visible region, and its optical band gap was calculated to be 3.56 eV.
Development of Test Bench for Coordinate Control between ABS and Regenerative Braking
Authors: Wang Ren Guang , Wang Bin , Sun Han Wen
Published: October 2011

The ABS, motor, Battery, fly wheels, wheel and roller are used to built test bench to measure coordinate control strategy between ABS braking and regenerative braking. The test bench can also be used to simulate engine brake during vehicle deceleration, and ABS control methods. This can reduce development time and cost effectively.
Adsorption Properties of Phospho-Polypeptide on Synthetic Hydroxyapatite Biomaterials
Authors: Shen Xiao Qing , Du Yan Jun , Zhou Yuan Yuan , Wang Si , Liu Bin , Li Zhong Jun
Published: October 2011

This article dealt with the effect of phosphorylated peptides and peptides onto hydroxyapatite (HAP) biomaterials by considering their influence when they were present at the synthetic HAP interface. The adsorption isotherms adequately fitted the Langmuir shape, and from the comparision between two different adsorbates, the results of the investigation indicated that the phosphate group greatly enhanced the adsorption affinity. The results obtained layed the solid foundation for further research on the regulating function of phosphorylated amino acids with hydroxyapatite biological composites.
Liquid Flow Characteristics in Microchannels
Authors: Liu Yan Feng , Li Hong Wei , Zhang Jing Wei , Xue Jin
Published: October 2011

A three-dimensional model was developed to simulate the laminar flow and convective heat transfer in rectangular silicon microchannels，which have hydraulic diameter of 95.3，92.3 ,85.8 , 80 and 75μm respectively．The rationality of the simulation methods and results were validated by comparing with experimental data. The simulation results indicate that the aspect ratio has a significant impact on the Poiseuille number. Conventional ﬂuid ﬂow theory is fit for researching the fluid flow in microchannels, Po is a constant that is not dependent on the Reynolds number.
Experimental Research on Superlong Deep-Hole Drilling Processing Technology for Beryllium Bronze
Authors: Liu Zhan Feng , Li Rui Liang
Published: October 2011

According to the material properties and the cutting performance of beryllium bronze, research into the various factors of cutting, such as the materials heat treatment, the cutting tool material, cutting-tool angle and the cutting parameters, combined with the actual structure of the workpiece and the overlong deep-hole processing method for study. The test proved that selected reasonable heat treatment , processing methods, cutting tools and cutting parameters can be solved Φ12mm × 4000mm overlong deep-hole processing problems of the beryllium bronze.
3D Numerical Simulation of Fluid Flow and Heat Transfer for Asymmetric Spiral-Gear Inserts in a Tube
Authors: Peng De Qi , Wang Wei Qiang , Yu Tian Lan , Wei Biao , Zhou Yu , Tang Jia Shi
Published: October 2011

For solving cleaning fouling online for shell-and-tube heat exchanger，an asymmetric spiral-gear cleaning technology is presented. The RNGk-εturbulent model is used to simulate the fluid flow and heat transfer of the tube with the spiral-gear. Its velocity and turbulent intensity field, convection heat transfer characteristic and resistance property are analyzed. Numerical simulation results shows that radial velocity is larger in the annular area near the tube wall than that in the smooth tube. Tangential velocity in the diameter area corresponding to the width of spiral-gear insertion increases with radius，but it decreases with radius in the annular clearance between the insert and the tube wall. However, fluid tangential motion of the smooth tube is only stochastic，and its tangential velocity is lower several orders of magnitude than that for the tube with the insertions. The average surface heat transfer coefficient of the spiral-gear-inserted tube wall is increased nearly 88% than that from the smooth tube wall. In addition, the pressure drop caused by spiral-gear inserts is in the permissible range of engineering application. The inserts is applicable to the heat exchangers at a flow rate lower than 0.8 m·s-1.
Design of ROV Training Simulator
Authors: Ge Xin , Guo Wei , Li Zhi Yang
Published: October 2011

Semi-physical simulation technology and virtual reality technology in real-time three-dimensional dynamic simulation of remote operated vehicle, and a set of real ROV control system are utilized to design a ROV Training Simulator. This ROV Training Simulator can not only be used to train ROV operators, reduce the times of sea trial,but also can verify the function and performance of real ROV control system.
Numerical Study on the Interaction of Water Mist with a Fire Plume
Authors: Zhao Xiang Di , Xu Hong Li , Wang Xi Shi
Published: October 2011

A numerical study on the interaction of water mist with a fire plume was conducted using FLUENT software. The effects of different mist characteristics, such as droplet size and spray intensity, was considered in this simulation. The fire plume temperature history and velocity field were investigated. The results show that with a certain droplet size of water mist, the extinguishing time will be shorter when the mass flow of water increases, but this effect is no longer distinct after the mass flow of water mist increased to a critical value.
The Simulation of the Influence of Honed Edge Radius on the Cutting Force and Torque in Drilling 42CrMo with K-Grade Carbide Drill Bit
Authors: Wang Tao , Ke Ya Shi , Zhou Yi Dan
Published: October 2011

This paper uses a metal cutting simulation software AdvantEdge FEM as the platform, and simulates the drilling process of three different honed cutting edge K-Grade carbide drills. The aim is to study the influence of different magnitude of honed cutting edge on the the cutting force and torque. According to the simulation, the z-axis force and torque increase while the margin of the fluctuation decrease with the honed edge radius increase. In this paper, the z-axis force and torque reach the maximum and the margin of fluctuation in the smallest when using the honed edge radius of 0.10mm.
A Novel Dictionaries Preconditioning Algorithm for Compressive Sensing
Authors: Zhang Chao , He Yi , Li Bo
Published: October 2011

A Novel dictionaries preconditioning algorithm for compressive sensing is proposed in this paper. This algorithm uses alternating projection method to construct sensing and measurement dictionaries with low mutual and cumulative cross coherence. The coherence property of the constructed dictionaries is superior to those constructed by Schnass’ method and by Dictionaries Construction algorithm. The complexity and computation amount is lower than Dictionaries Construction algorithm. The constructed dictionaries improve the performance of OMP and SP algorithms.
Using Optical Flow under Bird’s-Eye View Transform to Estimate the Height of Objects around a Vehicle
Authors: Lei Fung Chan , He Chin Yi , Lo Rong Ching
Published: October 2011

The paper proposed a new method that can real-time estimates the height of objects with a single camera from a bird’s–eye view. Generally, it is impossible to obtain 3-D information, like the depth of objects, with a single lens camera without the additional information, such as the height and the tilt angle of the camera, are known in advance [1]. The disparity map of binocular cameras is usually employed to estimate depth. It is not suitable for vehicles to estimate the height (similar to depth estimating from a planar view) of objects from a bird’s-eye view due to the difficulties of installing and corresponding. Therefore, the optical flow to estimate the height of the object with one camera is proposed. There are two features under a dynamic bird’s–eye view of image. First, the optical flow value is proportional to the height of the object. Second, there is no perspective effect in each layer height of an image plane. Several experimental results are included to show the proposed method is feasible.
The Development of ESP Control System Based on the Fuzzy-PID Control Strategy
Authors: Wang Liang Mo , An Li Hua , Tan Li , Wu Zhi Lin , Li Li
Published: October 2011

In this paper, the author primarily established the vehicle dynamics model with seven degrees of freedom by MATLAB / Simulink, which could reflect the longitudinal motion, lateral motion and yaw of the vehicle. Under the environment of MATLAB/Simulink, the Fuzzy PID control system based on yaw and sideslip angle is integrated to the 7-DOF vehicle model. With this model, two kinds of emergency double lane change steering condition of the joint control analysis are carried out to check the effects of the control system on the emergency lane change, passing, avoiding obstacles. The results showed that the vehicle stability control system designed can improve vehicle handling and stability, assisting the driver to adapt to various roads and driving conditions, achieve a good effect on the active control, and greatly improve the driving safety.
The Research and Design of Elevator Automatic Rescue System
Authors: Lin Jian Yi , Ji Yi Jun , Wu Chao
Published: October 2011

With the widespread use of the elevator, the shortcomings of the current elevator design become apparent. Especially the phenomenon of people being trapped in the elevator caused by accidently powered-off or some other reasons, which not only arouses much uncomfortable, but also threaten the safety of passengers. To solve this problem, an Elevator ARS (Automatic Rescue System) based on Internet is proposed and designed in this dissertation. The system is developed based on high performance MCU (Micro Control Unit), by which all status of elevators can be monitored through Internet.
Research on Anti-Collision Technology among Tower Cranes
Authors: Lv Guang Ming , Wang Jian , Zhang Qing
Published: October 2011

According to the collision of tower cranes working on the construction site, this paper establishes the mathematical model of the tower cranes first, and analyzes several possibilities of collisions. The model is based on homogeneous transformation, thus the distance between tower cranes which is dangerous can be calculated accurately, then the monitor will give an alarm. Based on Visual C++ 6.0, the calculation program is provided as the core of the control system. At the same time, the algorithm and methods to adjust flat arm tower cranes are introduced in this paper, and they are verified by examples through running the program.
A Buck Converter Based Reduced Voltage Starter for DC Oil Pumps
Authors: Li Jian Wen , Ju Ning , Li Pei , Xing Jian Ping
Published: October 2011

Designed a Reduced Voltage Starter for DC oil pumps in power plant, which is a Buck Converter based DC-motor soft Starter/Stopper with 220VDC power supply. In this paper, the main circuit, working principle and operating sequences of the switches of the device are clarified; and the design of each circuit unit is briefed; the transient of Buck Converter are analyzed and the snubbers for the Buck Converter are designed; at last the load test results of 55kw device are sketched. After running in a number of power plants, it's been proved that the device is an upgrade for traditional Rotor Resistance Starter, for its stability, reliability, efficiency, and intelligence.
Estimation of Core Losses on Electrical Steel Laminations in Wind Generators Using Epstein Frame and Expanded GSE Method
Authors: Tsai Wen Chang , Chen Bill
Published: October 2011

The paper intends to study the core losses of non-oriented electrical steel laminations under high frequency voltage excitations. The measurement of core losses of the electrical steel laminations in Epstein Frame is implemented step by step from 50 Hz to 5000Hz. The accuracy of results evaluated from Expanded GSE method is compared with those tested by Epstein Frame. The core loss database for three different kinds of medium, medium-high and high quality electrical steel laminations (50CS350, 50CS470, 50CS600) is completed in the paper. Also, 85 test points of core loss data are established in the flux density ranging from 0.3T to 1.8T and in the power supply frequency ranging from 50Hz to 5000Hz. Maximum core loss value is close to 443W/kg. The tested core loss data and the Expanded GSE models are useful and may cover for the applications of large-scale wind-driven generators and general motors. They also enough provide designers with the accurate information to minimize the core losses of wind turbine generators.
Civil Aeroengine Fault Diagnosis Based on Fuzzy Least Square Support Vector Machine
Authors: Qu Hong Chun , Ding Xie Bin
Published: October 2011

SVM(Support Vector Machine) is a new artificial intelligence methodolgy, basing on structural risk mininization principle, which has better generalization than the traditional machine learning and SVM shows powerfulability in learning with limited samples. To solve the problem of lack of engine fault samples, FLS-SVM theory, an improved SVM, which is a method is applied. 10 common engine faults are trained and recognized in the paper.The simulated datas are generated from PW4000-94 engine influence coefficient matrix at cruise, and the results show that the diagnostic accuracy of FLS-SVM is better than LS-SVM.
Intermittent Intensity Clutter Removal of Wind Profiling Radar Based on FrFT
Authors: Li Jia Qiang , Qin Xian He , Zhang Yin Sheng
Published: October 2011

Intermittent intensity clutter in wind profiling radar severely interferes with the identification and spectrum estimation of atmospheric echo signals. In order to remove such clutter, a method based on Fractional Fourier transform (FrFT) is presented. The proposed method makes use of energy concentration property of intermittent clutter in fractional Fourier frequency domain. Not only the intermittent intensity clutter can be removed in the fractional Fourier frequency domain by using a narrow band-stop filter, but also the atmospheric signal in the time domain can be reconstructed after removing the clutter. Computer simulations have verified the effectiveness of the method.
Image Processing and Recognition System Based on DaVinci Technology for Coal and Gangue
Authors: Zhao Yi Ding , Sun Ming Feng
Published: October 2011

In this paper, an image processing and recognition system of the coal and gangue has been studied. We adopt digital video processing technology of high performance---DaVinci technology to design the system, which is made up by the chip DM6437 and some peripheral auxiliary equipment. The system takes advantage of the high performance of the chip to process the real-time image collected by the CCD camera. The system uses optimized image processing and recognition algorithms, and makes the recognition of coal and gangue by the different characteristic of their histograms. In the system, the histogram and processing image of coal and gangue can be displayed on the monitor.
Wavelet-Based Filtering Method for Sleep EEG Signal
Authors: Qiang Hua , Yang Rui , Zhang Guo Dong
Published: October 2011

In this paper, in accordance with several common signal interference in sleep EEG detection, it is processed by wavelet transform. It mainly includes: ①.remove white noise from EEG using wavelet threshold method; ②.remove baseline drift from EEG using wavelet decomposition and reconstruction method; ③.remove sharp pulse interference using wavelet modulus maximum algorithm; ④.remove EMG from EEG using wavelet decomposition and reconstruction as well as modulus maximum method. The results of simulation study show that: it can filter a variety of common interference in EEG detection preferably by wavelet transform.
The Design and Implementation of the Automobile Wiper Test System Based on Hall Sensor and LIN Bus
Authors: Jiang Yi Cheng , Zeng Guang
Published: October 2011

The most basic functions of wiper test system for modern high-grade cars are to provide accurate measurement of swing times of the wipers and real-time control of LIN wiper motor. In this paper, the design of a wiper test system composed of Hall sensor, LIN bus and MCU has been developed based on the research on Hall sensor and LIN bus. In the system, MCU is used to collect information of the swing counting sensors and controls the LIN motor. USB bus is chosen to interconnect the embedded system and the computer and counting sensors are responsible for wiper swing counting. Tests and actual operation showed that the wiper test system proposed in this paper is feasible, which offered automated wiper test and ensured quality of wipers. The system is of high practical application value.
Design of VCU for Pure Electric Vehicle
Authors: Kong Hui Fang , Ge Qing Guang , Xia Shun Li
Published: October 2011

. The control principle of VCU (Vehicle Control Unit) was described in this paper. Both hardware and software based on MC9S12XET256 microcontroller were designed using modular design method. Fuzzy control method was used for the study of recovery of braking energy. Through the design of software and hardware, vehicle control functions are realized, including real-time data acquisition, data communication, braking energy recovery and so on.
Technology and Application of Oil Sludge Pyrolysis in Rotary Furnace
Authors: Wang Wan Fu , Du Wei Dong , Tang Lin , Liu Peng
Published: October 2011

Technology of pyrolysis rotary furnace for oil sludge was conducted in this paper, which feature with natural gas as fuel, multi-combuster for heating controlling and novel dynamic-static sealing structure at both ends of the rotary furnace. A complete set of technical process was designed and operated with processing scale of 10 tons/day of oil sludge (The sludge moisture content is 80%). The result indicates that the system meets the standard of safe running. Recovery rate of the oil in sludge is more than 80%, while the oil content of pyrolytic residues is less than 0.3%. The main components of non-condensable gas include methane and hydrogen, occupying 35% and 40% respectively. There are high content of lightweight fractions in pyrolysis oil, such as gasoline, kerosene and diesel oil, in which the C10-C15 is near to 50%-60% and aromatics can be up to 60％. Finally, due to the high contents of carbon and aluminum salt in residue, it is much worth for the carbon and aluminum salt recovery.
Research on High Precision and Stability of Three-Phase Rectifier Based on Fractional PIλ Order Controller
Authors: Yu Fei , Zhang Yi Ming
Published: October 2011

According to the demand of transmitter for deep exploration, this paper presents a strategy of current double closed loop control based on fractional order controller, which used to improve the tracing performance and anti-interference capability of the current regulating loop, also the stability of load current. And also presents a modified GA-PSO algorithm to get the parameters of fractional order controller. Results show that modified GA-PSO algorithm has faster convergence speed and higher accuracy, new control strategy using in three-phase PWM voltage rectifier has remarkably improved the stability and anti-interference capability of system.
Research on Process Monitoring and Adjusting Methods
Authors: Wang Xiu Hong
Published: October 2011

Special reason and common reason bring on the process disturbance. Statistical process control (SPC) is commonly used to monitor the process disturbance which arises from assignable reason. Engineering process control (EPC) compensates the deviation of output for common reason based on the feedback adjustment principle. Therefore, integrated SPC/EPC approach has better performance than that merely using SPC or EPC. However, in practice, it is very hard to search the appropriate method to apply for integration of SPC/EPC. The main reason is that EPC’s compensation has depressed probability which assignable reason is monitored by control chart. In this paper, a joint-monitoring method is designed to account for the above problems through detecting process output as well as monitoring process input. An example is given to prove that joint-monitoring can detect the process disturbance more quickly and more accurately.
Research on the Affection of the Underwater Missile Launching Process
Authors: Shang Shu Cong , Sun Jian Zhong
Published: October 2011

A dynamic model and numerical method which was in the underwater vertical launching process have been built, and the missile which was on the effects of the lateral flow was simulated with its movement and load. The results showed that: the model is feasible; adapter compressive stiffness and its layout in the tube has a greater impact on the movement and load of the missile; fluid added mass effect is not negligible; the lateral movement of the missile’s launching process was along with a large shock , so we must attach importance to the problem of vibration. lateral flow
The Designs of Intellectual Lighting Control System Based on 51 Single-Chip
Authors: Mei Xu
Published: October 2011

With the development and maturity of intelligent buildings, energy conservation become a trend, lighting control systems are becoming increasingly popular. At the same time with the rapid development of electronic technology, microcomputer as a subject and core for embedded control systems, instead of the traditional conventional electronic circuits of the control system, based on single chip microcomputer control system has been widely used in intelligent building. This text directs against the power consuming wasting phenomenon of public place, regard AT89C51 as the core, propose a measurement for Pyroelectric infrared sensor and light combination of intelligent lighting control system. By judgment on the light intensity and indoor if someone automatically switch lights, achieve the purpose of energy saving.
3D Numerical Simulation of Flow Perpendicular to One Face of a Cube in a Straight Rectangular Duct
Authors: Liu Ming Qin , Liu Y.L.
Published: October 2011

In this paper, a numerical flow model combining with the Realizable k–ε turbulent model for compressible viscous fluid is presented for the simulation the flow perpendicular to one face of a cube in a straight rectangular duct; and the equations are solved with the finite volume method. The computed velocity field distribution shows that the proposed model is reliable and can be applied to the numerical simulation of turbulence flow in ducts.
Study on Dynamics Simulation of Rigid-Flexible Coupling for CNC Machine Tool
Authors: Luo Wei Ping , Chen Man Hua , Wang Jun
Published: October 2011

A virtual prototype model of five-axis CNC machine tool has been constructed. Through the ADAMS software, the process of the machine is simulated and the dynamic analysis is carried out. The experimental model analysis on the column of the machine is practised with the software ADAMS, the weak link of the column is found out and a modification scheme is put forward for the design of the column structure. Improvement of structure of the column can effectively raise the working accuracy .Currently, five-axis CNC machine tool is the only way to solve parts processing such as impeller, special propeller, turbine rotor , large diesel engine crankshaft ,etc. Therefore, it is very important to carry out the dynamic analysis of the five axis CNC machine. In this paper, a rigid-flexible multi-body dynamics model for a five-axis CNC machine tool is set up, in which the column parts are modeled by flexible bodies. Aimed at the improvement of the machining accuracy, the effect of different structures of column are analyzed.
Simulation Analysis of Conformable Substrate on an Eddy Current Sensor Array’s Output Characteristics Based on Finite Element Method
Authors: Du Jin Qiang , He Yu Ting , Ding Hua , Wu Li Ming , Shao Qing
Published: October 2011

Finite element models of an eddy current sensor array are built up by electromagnetic-circuit couple method, and the influences of conformable substrate on sensor’s output characteristics are analyzed by those models. It is shown that the model contains the conformable substrate has almost the same output characteristics as the model without it, but the output amplitudes and phases of the former model are higher than the latter. Therefore we can simply the sensor as a single surface to facilitate the analysis, and then revise it to fit to the real sensor.
Present Condition and Outlook about SVG
Authors: Zhao Ying , Yang Pan Pan
Published: October 2011

Along with the exaltation of people to the electric energy quality requirements, the importance of compensating the reactive power is valued by people. The offset device of various kinds emerges with the tide of time. SVG plays an important part in the reactive compensating by the advantage of its quality. This text described the development, radical principle and control method of SVG and still introduced the limits, advantages and some improvement measures at the same time. Finally carry on analysis to the development tendency and lay foundation for the search of SVG technique.
Experimental Study on the Frictional Resistance of Gas-Liquid Two-Phase Flow in Vertical Helically Coiled Pipe
Authors: Zheng Shui Hua , Mu Jie Gang , Li Jia
Published: October 2011

Experiments were carried out to learn about the frictional resistance of gas-liquid two-phase flow in vertical helically coiled pipe. The expression of friction factor is established and the formula used to calculate the frictional resistance of gas-liquid two-phase flow in vertical helically coiled pipe is defined based on partial data got from different experiment conditions. The calculating formula was verified by the experimental data and the result indicates that the formula is accurate enough to calculate the frictional resistance of gas-liquid two-phase flow in similar operating conditions.
Study on Changes of Metal Chemical Composition by Abrasive Wear of Alfalfa Powder
Authors: Zhang Ke Ping , Wu Jing Feng , Huang Jian Long , Huang Xiao Peng
Published: October 2011

The abrasive wear of 45 steel and HT200 iron which are usually used on agriculture machine was tested by alfalfa powder on a grinding abrasion testing machine. The chemical composition on both wear metal surface and original surface were analysed with energy dispersive spectroscopy (EDS). The results indicated that metal element contents on the metal wear surface were decreased, while the nonmetallic element contents were increased.
Free Vibration Analysis of Cantilever Rectangular Plates with Variable Thickness
Authors: Huang Mei , Xu Yu , Cao Bo
Published: October 2011

A new method-mixed boundary grid method (FBGM) is proposed to analyze the free vibration of cantilever plates with variable thickness. The fundamental differential equations of the plate are established for the bending problem. By transforming these equations into integral equations in a small area and using the trapezoidal rule of the approximate numerical integration, the solution of these equations is obtained and chosen as Green function to obtain the characteristic equation of the free vibration. The accuracy of the numerical results for the natural frequency parameter calculated by the proposed method is investigated.
The Research of Vibration Characteristic about Sucker Rod String
Authors: Li Bin , Wang Xu Dong
Published: October 2011

During the reciprocating motion, the sucker rod string of the pumping wells will produce longitudinal vibration, lateral vibration and torsional vibration under various loads, the rod combination and structure often affect the fatigue fracture and releasing of the sucker rod string. Based on the ANSYS (finite element analysis) method, this article made an analysis for the vibration characteristics of sucker rod string, and studied the steady-state response of suspension point movement and the pumping load, mastered the influence law of vertical, horizontal and torsional natural frequency with different rod combinations, acquired the steady-state response under the two main loads of suspension point motion and pumping load. This article made a great significance for scientific design of sucker rod string and preventing broken off accidents of sucker rod string.
Research of the Mechanism of Ferroelectric Phase Transition in Perovskite: Empty Orbital Model
Authors: Fang Chao , Chen Liang Yan
Published: October 2011

The empty orbital model in perovskite ATiO3-type (A=Mg, Ca, Sr and Ba) ferroelectrics with oxygen octahedra has been proposed. In this study, the impact of temperature on the bond energy of Ti-O has been discussed from the point of view of statistical thermodynamics, then the temperature dependence of equilibrium position of Ti ion has been calculated. The results show that because of the existence of empty orbital, with temperatrue decreasing the repulsion energy of Ti and O ions reduces and the Ti ion shift the equilibrium position in the cooling through the Curie temperature owing to Coulomb interaction. Ferroelectric phase transition in perovskite are successfully explained. Theoretical and experimental results for perovskite ATiO3-type ferroelectrics are compared and discussed.
Design and Simulation of a Mini Precision Positioning Magnetostrictive Inchworm Linear Motor
Authors: Pan Peng Sheng , Yang Bin Tang , Meng Guang , Li Jian Qiang
Published: October 2011

Giant magnetostrictive actuator (GMA) has advantages over other actuator made of intelligent materials in aspects like quick response, large output force, and high precision. But the lack of displacement, relatively big size and heavy weight block its popularization. In this paper, a new mini linear motor based on three GMAs is designed. It is the second generation motor derived from the improvement of the first generation linear motor that is realized in our previous work. To compensate the structural defects and to improve the traveling performance of the previous one, we redesign the motor in the structure, especially the frame as a whole by considering not only the basic supporting and connecting role but also the displacement amplifying function in it. The paper presents the process of the structural design of the mini linear motor, the establishment of the motor’s system dynamic model and the traveling simulation under SIMULINK. The new structural scheme and the motor’s system modeling approach are validated by the simulation results. Keywords: magnetostrictive; inchworm linear motor; structural design; dynamic modeling
Research and Application of Faster Design Support Technology of Wind Turbine Pitch Bearing
Authors: Gao Qing Feng , Wang Yang , Rui Xiao Ming
Published: October 2011

On the basis of intensive study on the characteristics of structure and standards of wind turbine pitch bearing, the paper established the parameters level model of pitch bearing, analyzed the vague relationship between the size of pitch bearing and the capacity of wind turbine and determined the main design parameters of pitch bearing. Via combining open parametric method for part family and parameter-driven technology, this paper also developed a faster design support system of pitch bearing of wind turbine, which effectively cut down repetitive design work and improved the efficiency of design and the reliability of pitch bearing.