bluuebunny/crossref_metadata_2025 huggingface dataset:
The Performance Comparison and Benefit Analysis of Speed Control System of Mine Motor Vehicle
Authors: Zhang Xi , Chen Wen Chao , Yang Jie , Hu Liu
Published: September 2012

The DC motor has good characteristics of large starting torque and good traction and strong overload capacity, traditional battery motor vehicle often adopts DC motor drives as driving system and uses the series resistance to adjust speed. However, in actual coal production, since motor vehicles are often placed in wet, explosive and dusty environment, the speed control system of motor vehicle has strict proof and moisture requirements, however, the inherent characteristics of the DC motor make it a serious shortcoming in the coal mine production, there is an urgent need to improve the structure to meet today's actual demand for coal mine automated production. This article is in this context, to compare the DC motor speed control system with AC speed control system of the mine car, discussing today's mainstream technical programs of AC speed control system, focus on the analysis of the great differences over performance and economic efficiency of the speed control system of mine motor vehicle after adopting AC speed control system.
A Vehicle-Mounted Power Plant Based on Hybrid Electric Vehicle
Authors: Wang Ren Guang , Shi Guang Kui , Wang Bin , Kong Zhi Guo
Published: September 2012

In hybrid electric vehicles, there is a set of electricity generating system. This system was modified to meet requirements of vehicle-mounted power plant. The new system is mainly composed of engine, generator, planetary gears, motor, battery, transfer case, control system and etc. and the planetary gears mechanism has two sets of planetary, control system includes vehicle controller, engine controller, motor controller, and inventor. This system can perform the functions which include vehicle driving, generating with vehicle ruining and generating with vehicle stopping. It can meet requirements of special purse vehicles.
A Modeling and Simulation Study on New Type Continuous Variable Damper with Solenoid Valve
Authors: Xia Guang , Chen Wu Wei , Tang Xi Wen
Published: September 2012

A new type continuous variable damper based on solenoid valve is studied in this paper. The structure and principle of continuous variable damper based on solenoid valve are analysed. The hydraulic model and mathmatic model of rebounce stroke and compress stroke are established. Then the damping characteristic is simulated in matlab software and is provided a theoretical reference for product development of the damper based on solenoid valve.
Study for Three-Dimensional Design of the Engine Crankshaft Piston Group
Authors: Liu Yong Feng , Pei Pu Cheng , Yang Jian Wei , Zhu Ai Hua
Published: September 2012

In order to establish the three-dimensional model of the crankshaft piston group, the application of characteristic modeling method was proposed directly through the designer to extract features from the BULL operations, and finally form a part model of the design and definition. Analysis of the expression of the crankshaft features and characteristics of the link, use Pro-E to build a diesel engine crankshaft and the piston rod group of feature modeling. a new three-dimensional assembly drawings was built. It provide a new design ideas for reserachers.
Application of Wavelet De-Noising in Fault Diagnosis of Wind Turbine Gearboxes
Authors: Kou Hai Jiang , Yuan Hui Qun , Zhao Xiao Yu
Published: September 2012

Fault detection and diagnosis of a wind turbine gearbox are important to ensure the reliability and useful life of the wind turbine system. In this paper, an experimental test in wind turbine gearboxes is carried out to obtain faulted information which consists of response random non-stationary noise and the additional response due to failure. An approach, using wavelet de-noising method, is proposed for removing non-stationary noise from the recorded signals. The time domain analysis and frequency analysis are used to diagnose the fault location of the machine accurately. It is shown that wavelet de-noising method provides a better correction than conventional method in order to remove non-stationary noise. Diagnosis results indicate that the high-speed shaft of wind turbine gearboxes has a serious imbalance.
Performance Analysis of a New Type of Wind Resistance Brake Mechanism Based on FLUENT and ANSYS
Authors: Gao Li Qiang , Xi Ying , Fu Qiang , Zhu Mei Hua , Zhang Jin Sen
Published: September 2012

Introduce a new type of non-adhesion braking mode - aerodynamic braking; Meanwhile we analyze the structure of the wind resistance brake mechanism. Based on commercial software Fluent, numeric simulation are applied to the flow field of high speed train with wind resistance brake mechanism in order to work out the pressure distribution law of wing plate and high speed train as well as wind resistance. Based on finite element theory, finite element model of wind resistance brake mechanism is built by ANSYS. Then we make static load analysis and modal analysis to the wind resistance brake mechanism. From the computation and analysis above we get some good conclusions.
Intelligent Driver Designing for Electro-Hydraulic Proportional Valve of Engineering Machine
Authors: Cao You Hui , Liu Jin , Shao Li Fu , Liu Fei , Xu Wen Qun
Published: September 2012

Intelligent driver based on C8051F500 and TLE7242-2G for electro-hydraulic proportional valve was designed in this paper. The driver has CAN interface, and can drive four channel electro-hydraulic proportional valves. The system scheme, power unit, MCU unit, drive unit and software were analyzed in detail. At last the system performance was simulated with MATLAB. The Intelligent driver is suit for modern engineering machine’s control system, which demands networking and distributed control.
Fiber Reinforcement Effect of the Corn Stalk Skin
Authors: Liang Li , Zhao Xiu Ting
Published: September 2012

Since the mechanical properties of the skin and the core of corn stalk are different significantly. The basal fourth internode of the corn stalk was chosen to do the compression test. The Maximum Force, the Compressive Strength, and the Modulus of Elasticity of the stalk skin and the core were obtained respectively. Then, the modulus of elasticity parallel to the direction of stalk skin fiber was calculated based on the measured data. The fiber reinforcement effect of the corn stalk skin was analyzed, combined with the mechanics of composites. Furthermore, the finite element model of corn stalk, regarded as composites, was constructed by ANSYS to simulate the compression test. The results showed that the simulation of reinforcement effect was well consistent with the value calculated by the mechanics of composite.
Research of Aerodynamic Noise Prediction of High-Speed Train
Authors: Yang Li Fang , He Xiao Wei , Meng Fan Yu
Published: September 2012

Under the background of China rapid development of high-speed train, this paper aims at prediction of the aerodynamic noise of train, which plays a key factor for controlling the train noise. In order to develop the prediction model of the aerodynamic noise of train, first the finite and boundary element theory are utilized to calculate the fluctuation pressure of the motion train; then Statistical Energy Analysis (SEA) model of the train noise is built and the SEA parameters are calculated. Based on the above models, the prediction method of aerodynamic noise of train is developed to calculate the train noise with train velocity.
Precision Modeling and Deformation Analytic Computation of Throttle Slice of Telescopic Shock Absorber
Authors: Zhou Chang Cheng , Li Hong Yan , Liu Xiao Ting
Published: September 2012

Based on the actual pressure condition of throttle slice of telescopic shock absorber, the general solution of throttle-slice deformation curved surface’s differential equation on a non-uniform pressure, was given, and by mathematical transformation, the deformation analytic formula was established. With the practical example, the deformation of throttle slice on non-uniform pressure at any radius was computed, and was testified by ANSYS, the value computed is close to that simulated, and the relative deviation is only 0.0021%. The results shows that the method of deformation analysis computation of throttle slice on non-uniform pressure is reliable, which has important reference value for throttle slice thickness design and characteristic simulation modeling of shock absorber.
Research on the Vibration Measurement Approach to the On-Line Noise Evaluation for Vehicle Transmissions
Authors: Zhao Feng Qiang , Li Guang Qiang , Hu Hong Ying , Du Jia Lu , Guo Chen
Published: September 2012

At present, the common method of testing noise generated by vehicle transmission before delivery is to measure the noise sound pressure level by means of sound level meter. Since the measurement result is susceptible to background noise, the method can only be operated in anechoic chamber. In this paper, in order to measure sound pressure level directly on production-line, a new vibration measurement method and its relevant formula are presented. The proposed method can effectively avoid being affected by background noise and obtain the sound pressure level of transmission noise on production-line by testing the vibration acceleration signals of transmission box. It’s proved that the new method makes the delivery test of transmission noise more convenient and effective. Moreover, it can improve the delivery quality of transmission as well as the performance of whole vehicle.
Direct Position Analysis of a Reconfigurable 4-DOF Parallel Mechanism
Authors: Zhang Er Jiang , Li Yong Gang
Published: September 2012

This article presents a direct position analysis of a reconfigurable 2PRS-2PUS parallel mechanism. Based on the structural features of this new mechanism, take the absolute coordinates of the four balls vice center on movable platform as the output variables, a direct position analysis which using elimination method is presented. The solution is verified by a group of numerical examples, which given by matlab. In addition, graphical representations of the real solutions are presented.
Influence of Slide Stroke Curves on Forming Quality of Box Shaped Part during Deep Drawing
Authors: Xia Qin Xiang , Xu Teng , Li Zhen Shi , Ruan Wei Ping
Published: September 2012

To explore the influence of slide stroke curves on deep drawing and solve the problems of cracking and wrinkling during drawing, the deep drawing processes of box shaped part with the conventional mechanical press and servo press were simulated, respectively. The variation rules of cracking and wrinkling for box shaped part by different slide stroke curves were obtained. It shows that the qualified parts can be obtained more easily when drawing with servo presses by decreasing the rotational speed of servo motor at the forming stage due to its variability; drawing cycle can be shorten effectively by adjusting the variable displacement-velocity curves of servo press.
A Cutting Line Positioning and Defects Detection System for Polyurethane Plate Based on Computer Vision
Authors: Lu Ji Li , Lin Ming Xing
Published: September 2012

In this paper, we present a design of a real-time computer vision system for polyurethane plate cutting line positioning and defects detection. The main defect of polyurethane plate is uneven texture which doesn’t meet the product requirements. We translate the original image to gray image and find the points with strongest gray as the cutting line, extract feathers and detect defects. The experimental results show that it is easy and effective to position cutting points and find defects of polyurethane plate, which can meet the requirements of production and has great practical value.
Methods Research and Analysis of Non-Contact Measurement to the Moisture Content of Textile Material
Authors: Li Peng Fei , Sun Le , Jing Jun Feng
Published: September 2012

This paper introduces a microwave technology in measurement applications of textile moisture, and the humidity measurement principle is analyzed. This paper designs a non-contact textile material moisture content measurement system based on microwave. According to the result of the fitting line, the moisture content in this method for cotton cloth, denim and fine cotton cloth in the effective measurement range is 30~50% respectively, 30~55%, 35~70%.
Design of Orientation Measuring System for Rotating Body with Body-Fixed Magnetic Sensors
Authors: Li Shi Zhong
Published: September 2012

According to the basic principle of measuring the magnetic aspect angle for the rotating body using the zero crossings exported by the two magnetic sensors, a measuring system based on the fluxgate sensors is put forward in this paper. The resolved approaches about the circuit design are analyzed. Then, an experimental system is established, and the measuring experiments are carried out for the certain conditions. The experiment results indicate that the system has higher measuring precision, which can ideally meet the demand of measuring the magnetic aspect angle. The study could be applied to navigational aids, attitude correction, and determination of angular motion histories of rotating bodies, and so on.
Study on Doppler Velocity Measurement System
Authors: Li Jian Chao , Su Jun Hong , Gao Ming
Published: September 2012

In order to satisfy the high accuracy velocity measurement requirement, using the improved dual-frequency laser Doppler velocity measurement principle, designed a set of laser Doppler velocity measurement system. System consists of two parts: optical system and signal acquisition and processing system. Through the establishment of dual-frequency laser Doppler velocity measurement experimental platform for testing, the result shows that the method can be carried on the high accuracy velocity measurement which in high speed move object. Measurement range from 0.1 m/s to 50 m/s, the error is less than 2 percent and it could increase the speed measurement range.
A New EV Energy Control System under V2G Mode
Authors: Wang Zhen Po , Li Hai Tao
Published: September 2012

Based on the summarization of the concept of Vehicle-to-Grid and its recent development in the world, two topologies of V2G are put forward accounting for the different power supply modes. According to the analysis of the nowadays EV driving and energy system, a new topology of EV energy control system, which is suitable for application under V2G mode, is put forward, and its working principle is developed. The characteristics of this system are efficient, low cost and high integration. 1. Introduction
A High Speed Stacker Regulating Algorithm Based on Wireless Sensor Network
Authors: Fu Pei Hua , Zhu An Ding
Published: September 2012

An indoor positioning technique combined with wireless sensor network, RFID and photoelectric sensor is introduced into high speed stacker positioning and speed regulating systems. Compared to high precision retroreflective laser ranging sensors, the combined positioning technique can provide absolute addressing with low cost to speed up stackers. An optimization of frequency conversion motor with absolute addressing can increase improve turnover rate and reduce energy consumption of AS/RS systems.
A Computation Method for Symmetry
Authors: Feng Wei , Shao Xiao Fang , Cai Ming Juan , Cao Bin
Published: September 2012

This paper puts forward a mathematical method to measure the symmetry property of two image elements—a specific instance of the Gestalt law of symmetry. The method makes an abstract of image elements by introducing vector points and experimental results show that the computation results is consistent with the human perception interpretation in most cases.
Research on the Parameter Estimating Algorithms of Image Edge Detection
Authors: Shang Ya Ceng , Chen Jing , Tian Jun Wei
Published: September 2012

During detecting the edge of the images, the text partly use great likelihood estimation and least square method estimation algorithm to estimate, we found the result of two estimate algorithms used in the same model are different through experimental analysis. Aiming at above mentioned problems, this text divides the commonly used model in pattern process into the linear model and non-linear model, among the non-linear model, it divides into multinomial model, gauss model, shouldered index model and power counting model, and this text use great likelihood estimate algorithm and least square method estimation algorithm to estimate these models separately, and draw their scope of the application through the experiment, also provide the convenience for the future choice.
The Study of Wireless Sensor Networks Based On-Line Monitoring System for Fire
Authors: Wang Qing Hui , Diao Li Guo , Pang Yu Jun
Published: September 2012

In order to improve the efficiency of fire and reduce losses of life and property, in this paper,wireless sensor network is applicated in the fire and rescue. Wireless communication module chip is chipcon cc2430.Using temperature sensor and measuring pulse sensor,the data information of the temperature and pulse hops of person is transmitted to the terminal management system by wirelessly.Convenient the external person of scene command the fire scene.Practice shows that wireless sensor networks based on-line monitoring system firemen are great market potential.
An Energy-Efficient QoS Routing Algorithm for Wireless Sensor Networks
Authors: Wang Jun Hao , Meng Xiang Rui
Published: September 2012

For effective routing in wireless sensor networks many routing protocols have been implemented. However, transmission of data requires both energy and QoS efficient routing in order to ensure efficient usage of the sensors and effective access to the gathered measurements. An energy-efficient QoS routing algorithm for sensor networks is proposed which can also run efficiently with best-effort traffic. The algorithm finds a least-cost, delay-constrained path for realtime data in terms of link cost that captures nodes’ energy reserve, transmission energy, error rate and other communication parameters. Moreover, the throughput for non-real-time data is maximized by adjusting the service rate for both real-time and non-real-time data at the sensor nodes by using two different calculation. Simulation results have demonstrated the effectiveness of our approach for different metrics.
Study on Parameter Transfer Structure of Generalized Modular Based Graph Theory
Authors: Zhou Chao , Liu Yan Ping
Published: September 2012

For the purpose of reducing product structure levels and shorting transfer chain of parameter, in this paper the product structure levels are expressed with generalized modular. The concept of directed graph of parameter connection structure for generalized modular is proposed with the use of directed graph theory, generalized modular, sub-modular and part represented by vertex, the driven relations of parameter connection represented by directed edge, and the properties of directed graph of parameter connection structure for generalized modular are gained. The directed graph of parameter connection structure for generalized modular is divided into a number of sub-graphs according to the relations of product-level modular structure. And the horizontal edges of sub-graphs among vertexes are decomposed. Therefore, a standardized relation of parameter connection structure is established by given the decomposition algorithm and the mathematical description of parameters connection that are provide the theoretical basis for parameters connection analysis of variant design.
Effect of the Pixel Photosensor Width on the Recovered Spectral Intensity in Interferometric Imagers and the Correction
Authors: Hu Shuo , Wu Na , Zhang Xu Guang
Published: September 2012

The equation for the recovered spectrum is derived in spatially modulated interferometric imagers, which takes into account the pixel photosensor width. The results show that the effect of the pixel photosensor width on the recovered spectral intensity is related to the wavenumber and the intensity of the incident spectrum, which causes the broadband spectral waveform changed, and the distortion increases with the spectral bandwidth increasing. A mathematical algorithm is given to correct the distortion, and the experimental results show this method is effective.
Quantitative Analysis for SF6 and its Compositions in GIS
Authors: Wang Hai Lun , Shen Jian Wei
Published: September 2012

In this paper, a method for GIS equipment fault diagnosis by the analysis of volume fractions of the derivatives of SF6 gas inside GIS equipment is presented. For the method, based on the differential spectra method, a neural network model and the particle swarm optimization are used for training analysis of infrared spectra, to realize the quantitative analysis of specific derivatives. The experimental results show that the prediction errors obtained by particle swarm optimization training are markedly superior to prediction errors obtained using the traditional method.
The Research of Vision Measurement System Based on Sequence Image
Authors: Niu Kai , Xiang Hui Yu , Liu Jia , Han Bao An
Published: September 2012

In recent years, with the research intensity of machine vision in universities are increased ceaselessly, the achievement in machine vision’ field is gradually applied to all walks of life. This paper mainly discusses how the theory of machine vision applied in the practical measurement, and develops the overall measurement platform. Through the program operating in the computer, finally realizes the control of platform operation. It can collect multiple images; what’s more realize image processing and world coordinate calculation, providing a platform for the future research and application.
Testing Instrument for OPS in Hoisting Machinery
Authors: Li Li , Yu Xin Liang , Zeng De Xue
Published: September 2012

Aimed at the problem of lacking quantitative testing method for overspeed protection switch (OPS) in hoisting machinery during its regular inspection, the paper developed a testing instrument. The instrument consisted of a testing stand and a control system. The testing stand with a variable-frequency motor was used to install OPS. The control system include sensor, hardware circuit and software program, it can collect and process both speed signal and switching action signal of OPS and kept the speed value of switching action. The speed of switching action was just the quantitative testing value for OPS. By compared the testing value and the setting speed value determined by the standard, the qualification of OPS can be evaluated. Application result demonstrated that the testing instrument can test the speed value of switching action of OPS correctly. Thus, the instrument provided a quantitative method for inspectors to judge the qualification of OPS.
Research and Development of a CNC Machine Tool Dynamic Characteristics Test and Analysis System
Authors: Tian Kai , Liu Qiang , Yuan Song Mei , Yang Yi Qing
Published: September 2012

A dynamic characteristics test and analysis system for CNC machine tool is developed based on C++/Qt platform and NI-DAQmx data acquisition driver. The function modules include hammer experiment, signal continuous acquisition, spectral analysis, frequency response function analysis and signal coherence analysis, etc. The analysis results provide the basis of dynamics characteristics simulation and cutting parameters optimization. The system can be also used to analysis the vibration of the cutting process. Spectrum analysis modules help to assess the cutting stability and diagnose problems. Experiments show that the system has good accuracy and efficiency while the size and price are decreased compare with traditional equipment.
Simulation of Vector Control for Two Double Y Shift 30° PMSMs Series-Connected System
Authors: Shi Xian Jun , Liu Ling Shun , Zhou Shao Lei
Published: September 2012

A number of multi-phase motors can be series-connected and driven by a single inverter via the appropriate phase transformation rules, and all motors in series-connected can be independently controlled . In this paper, the working principle of two six-phase permanent magnet synchronous motor series-connected system is proposed, the vector control strategy of id=0 and the carrier-wave modulation PWM technology are adopted to make the decoupled running of the two motors. Simulation of the two motors series system is obtained based on Matlab/simulink. The feasibility of the series system is proved by analysis the independently operating of one motor when the speed of the other motor is changed.
A New Method of Flame Image Segmentation
Authors: Zhu Shu Xian , Zhu Xue Li , Zhu Yong Jun
Published: September 2012

Separating flame image from background is a precondition and necessary link for identification for recognition algorithm. In current application, the Otsu method is a simple, effective and threshold value selection method suitable for real time processing, but the limitation of this method is it depends too much on the image pattern of “double peak histogram”. To overcome the weakness and shortcoming of Otsu method, this paper puts forward a new method based on grayscale integral projection, for flame image segmentation and positioning. Experiments have proved that this method not only can separate a flame image from background correctly, but also can position the center of a flame image quickly so as to provide the important criterion for dynamic recognition of flame image.
The Numerical Simulation of Full Flow Field of Roto-Jet Pump and Analysis of Energy Losses
Authors: Wang Chun Lin , Zhao Chun Lei , Zhang Tian Fang , Liu Dong
Published: September 2012

The structure and working principle are introduced in the paper. Based on the physical model of key parts to roto-jet pump which is set up in Gambit, the 3-D steady flows numerical simulation has been implemented by means of Fluent under design operating conditions. This method could avoid the error in simulating single part of the pump. The result shows the interflow distribution of the pump, the difference effect is very well after installing short blades on impeller. the shape of collecting pipe has little impact on the pressure within rotor cavity and the vertex band is apt to form in the corner of the collecting pipe inlet. By analyzing the energy losses between two different installed types of roto-jet pump. The result shows that the energy loss of rotor cavity in right-closed impeller pump is more than in the left-open impeller pump, but the effect of impeller pressurization in left-open impeller pump is not well, the energy loss caused by collecting pipe is almost the same in the two different pumps. The analyzing results can provide some proposals for structure reforming, performance and efficiency improving.
Numerical Simulation on Spiral Hot Bending Process for End Sheet of Tubular Pile
Authors: Xu Shi Min , Huang Hua Gui , Sun Deng Yue
Published: September 2012

A new manufacturing method of spiral hot bending process for the end sheet of tubular pile was introduced in this paper. A three-dimensional (3-D) thermal-mechanical coupled elastic-plasticity finite element model was setup to simulate the hot bending process, and then, the section deformation mechanism from hot bar by rolling to the end sheet has been investigated from the simulation results. The industry manufacture conditions show that the efficiency and quality has been highly improved by the spiral hot bending process. The thickness variety along the radial direction of the workpiece has also been analyzed, the moment and force during the hot bending was also presented in this paper. These conclusions obtained can guide for the forming technology making for both the end sheet of tubular pile and other ring parts.
Face Detection Method Using PCNN and Skin Color Model
Authors: Zhou Dong Ming , Cai Hong
Published: September 2012

This paper presented a face detection method for the color image using pulse coupled neural network (PCNN) and skin color model. The color image which is processed well through light compensation is converted from RGB to YCbCr color space, then the skin area are divided into sub-block, and skin color segmentation is made for the image in YCbCr space. Finally, we use PCNN to extract all sub-block ignition time sequence, and calculate various sub-block difference degrees between target face and the tested image, if the difference degree is the smallest, then the target face himself is the same person. Experimental results show that the proposed method has higher accuracy and robustness, can obtain satisfactory detection effect.
Exterior Ballistic Data Processing by SVD and Wavelet Transform
Authors: Dong Yu Hua , Ning Hai Chun
Published: September 2012

This paper proposes a method of wavelet transform combined with SVD (Singular Value Extracting), and the abnormal data elimination in its trajectory measurement is studied. After the wavelet decomposition of the observed data, combining the approximate component and the detail component, the phase space is reconstructed. The increment criterion of singular entropy is used for the input observed matrix of SVD, and the singular value is selected. Then the original signal is reconstructed by SVD inverse transform. This method overcomes the distortion problem of data end in phase space reconstruction by Hankel matrix. The reconstructed phase space by components of wavelet decomposition is orthogonal. So it further improves the accuracy of noise reduction and abnormal detection by SVD. The results of experimental data processing show the effectiveness of this method proposed in the paper.
Research of ATC Simulation Platform Based Compass Short Message
Authors: Geng Zeng Xian , Zhao Yi Fei , Ye Zhi Jian , Zhu Cheng Yuan
Published: September 2012

The compass satellite navigation system is developed by China which could provide the clock real-time location services, short message service and precision timing services. Based on functions of the compass satellite navigation system, an ATC simulation platform based short message service has been proposed in this paper. The system structure, the functions of the simulation platform and the research content have been presented in detail. Finally the prospects of short message service are put forward to compelling the applications of air traffic management based compass navigation satellite system.
PLC and Inverter Communication-Based Seismic Simulation Platform Speed Control
Authors: Zhang Tie Yi , Zhang Yun , Zhou Xiao Rong
Published: September 2012

To meet control requirements of different vibrating frequency output, a new kind of motor speed control method which is the RS485 communication control mode of inverter and PLC has been developed in the seismic simulation platform, the design methods of hardware and software are presented.
Research on a New Type of Hydraulic Oil Tank and a Working States Monitoring System for the Hydraulic System
Authors: Chen Bao Jiang , Liu Yao
Published: September 2012

High level oil temperature is one of the most important factories for hydraulic system to breakdown. In order to improve ability of heat-radiation and control oil temperature within proper scope, new type oil tanks are required which are made up by plate-fin units. The analysis indicates that the new type oil tanks have a good natural ability of heat-radiation. To further enhance ability of heat-radiation, it should be fixed a fan in the bottom of the oil tanks, which can strengthen the ability of heat-radiation. With monitoring equipment, monitoring system can monitor the parameters of oil tanks in real time, and control the oil temperature within proper scope. Simulation experiments tell us some significant data.
MIMO System Stability Margin and its Flight Test Method
Authors: Qu Fu Cun
Published: September 2012

Aiming at the multiple input multiple output (MIMO) flight control system evaluation, put forward MIMO system stability margin definition, also put forward to get the MIMO system stability margin of the flight test method. The simulation results show that, the method is feasible.
Suppression of Superfluous Force of Electric Load Simulator
Authors: Liu Xia , Yang Rui Feng , Jia Jian Fang
Published: September 2012

Aiming at the superfluous force existing in the electric load simulator which can influence the load precision, the text researches the method to improve the control performance of the load system. The work principle of the electric load simulator was introduced, and building the control model of the load system based on, the whole electric load simulator control model was built. It designs feed forward compensation control algorithm. The simulation results proved that the method can solve the interference problem caused by superfluous force in theoretically.
The Design Principle and Application of Power Resistor with over Temperature and over Current Protection Function
Authors: Zhang Sa , Xu Zhong Hou , Chen Shi , Xu You Sheng , Wu Gen Hua
Published: September 2012

A power resistor with over temperature and over current protection function was designed in this paper, we developed a compact structure innovatively which integrated thermal cutoff and wire wound resistor in a tubular case. It has the same size and shape as a resistor without Printed Circuit Board redesign, offer higher security and wave-soldering. It is really a very important technological improvement and breakthrough in over-heat protective field of wire wound resistor .
Research on Servo System for CNC Machine Tool Driven by Permanent Magnet Synchronous Torque Motor
Authors: Wang Mu Lan , Xu Kai Yun , He Chuan , Zhou Lei
Published: September 2012

Permanent Magnet Synchronous Torque Motor (PMSTM) has the main characteristics of low speed, high torque, high precision and excellent stability, which can be applied to implement the direct driving technology for CNC (Computer Numerical Control) machine tool. In this paper, the mathematical model of PMSTM is simply introduced, and the various control strategies are discussed in detail. According to the requirement of high performance for PMSTM driving servo system in CNC machine tool, the corresponding suitable control method is employed in the feed servo system. The proposed scheme is also promoted to apply in the spindle system, the tool holder and the turntable of machine tool.
Implementation of Low Bandgap Reference Voltage Circuit for Power Management Applications
Authors: Lee Min Chin , Hsie Ming Chia , Hu Chi Jing
Published: September 2012

This paper proposes a low bandgap reference voltage circuit with low temperature coefficient and independent of suply voltage for applications to power management IC. This proposed circuit is design and implemented using the TSMC 0.35μm CMOS 2P4M process. Based on simulated and measured results , the chip size is 20.6000.680mm with power dissipation about 3.3mW, and the operation temperature range form 0Cto 100C with temperature coefficient about 9.29/ppmC. The chip suply voltage can from 2.9V to 3.3V with PSRR about 44.2 dB, and its output reference voltage can stable at 0.65V.
Optimized Non-Dead-Time Control of Inverter with Two-Phase Modulated SVPWM
Authors: Zhu Ming Xing , Shi Jing Bo
Published: September 2012

In the inverter control system, two-phase modulated space vector pulse width modulation (SVPWM) algorithm has the advantages of minimum switch loss and higher utilization of direct current (DC) bus voltage. Non-dead-time control strategy can eliminate the problems of the dead time effects. But the traditional non-dead-time control strategy heavily depends on the current zero-crossing detection, which may cause the output voltage distortion or even a short circuit. Based on the analysis of the reason for the distortion, a new optimized non-dead-time control method is proposed. Two methods for the detection of the overlapping area are enumerated. The conclusions are confirmed by the simulation results with MATLAB/ SIMULINK.
Profibus-DP Used in KDF4 Filter Rod Maker
Authors: Xu Hong Tao , Mu Ya Hui , Wu Xiao Wei
Published: September 2012

KDF4 filter rod maker is the newest and latest unit model in the field of filter rod maker, this article introduces and analyses the electrical control system of the KDF4 filter rod maker, then proposed a set of design project and applied it to the filter rod maker, which enhance the accuracy and reliability of the rod maker and improve the operating efficiency of the machine.
Microstructure Change of Bionic Units on Vermicular Cast Iron Processed by Laser in Thermal Fatigue Tests
Authors: Liu Yan , Zhou Hong , Yang Chun Yan , Meng Chao , Wang Chuan Wei , Ren Lu Quan
Published: September 2012

This paper focuses on the microstructure change of bionic units, processed by the bionic laser, on vermicular cast iron, during the thermal fatigue tests. The results show that the microstructure of bionic units is uneven, and the thermal fatigue first occurs in the region with coarser microstructure on the surface of bionic units; the thermal fatigue failure mode of the bionic units is oxidizing, fracturing and peeling layer by layer.
Reliability Method of Cyber-Physical Systems Based on Events Polling and Interrupt Control
Authors: Zheng Zhong , Xie Gang , Wang Jing
Published: September 2012

This paper proposed the reliability method of cyber-physical systems(CPS) based on events polling and interrupt control, discussed the reliability problem of CPS. According to the characteristic of polling principle and the CPS events model, proposed the polling principle of the CPS based on events. combined the method of the interrupt control, according to the spatio-temporal attributes of different events, set the different interrupt priority to solve the reliability problem of the CPS event model.
Evolutionary Structural Shape Optimization Based on Adaptive FEM and Boundary Representation of B-Spline
Authors: Gu Sheng Li , Wang Fu Ming
Published: September 2012

This paper presents a structural shape optimization algorithm based on the evolutionary structural optimization (ESO) method in conjunction with element error estimate and adaptive FEM. B-splines are used to describe the boundary of the design domain; the shape of these B-splines is governed by a set of master nodes which can be taken as the design variables. The optimal shape of the design boundary with constant stress is achieved iteratively by the movement and update of the position of the master nodes based on nodal stress leveling. The result quality, in terms of accuracy and efficiency, is tested and discussed with an analytical solution.
Principle and Realization of 2D Maps on Virtools in Roaming System
Authors: Zeng Min , Huang Xiao Xia
Published: September 2012

The immersive feeling brought by virtual roaming system easily causes the user to got lost in it. In order not to lose direction in a three-dimensional virtual environment, usually a 2D map and the real-time current location of the user are provided so that the user can know his location in the 3D virtual environment action to take for the next step. However, since the parameter transformation is difficult to understand, the technology in virtual system of roaming is limited to use and promotion. This article analyzes the principle of 2D map and suggests the way to realize it based on Virtools. Special explanation is given to how to convert data in the three-dimensional coordinate to the 2D coordinate and the mapping relationship between the direction of the three-dimensional space and the direction of the two-dimensional maps.
Fluidized Bed Temperature Control System Based on Virtual Instrument Technology and Fuzzy PID Algorithm
Authors: Liu Chun Qia , Yang Shi Feng
Published: September 2012

The fluidized bed is a complex system with a big lag, time-varying and non-linear. The conventional-PID methods are simple, practical, and high reliability. However, choosing and adjusting PID parameters rely on manual way. It is difficult to choose appropriate values when temperature requirement is higher. Inappropriate values may cause large overshoot and low control precision. Thus, in order to obtain more accurate and rapid PID control parameters and to avoid errors caused by human factors, the fuzzy control and PID algorithm were applied to the fluidized bed furnace temperature control system. The Fuzzy-PID controller was designed and the three PID parameters' self-tuning was realized. Simultaneously, the upper computer and the lower computer were designed. The lower computer mainly completed temperature measurement and adjustment functions. The collected temperature was transferred back to the upper computer at regular intervals. The upper computer was designed by virtual instrument technology. Practical operation shows that the temperature variation is below 0.3 when heating oven is in stable state and is close to the ideal PID response curve, which meets the average requirements of the fluidized bed heating oven. As an advanced reactor, fluidized bed was widely used in industrial process such as combustion, gasification and catalytic cracking[1].As the temperature affect the gas product composition of the fluidized bed, so improving the furnace temperature utilizing the automatic control system is one of the important issues furnace. The fluidized bed heating oven is heated by resistance wire heating and cooled by natural cooling. The temperature control after the adjustment is slow. It is a complex system with a big lag, time-varying and non-linear. Currently, the conventional-PID methods were taken to control the fluidized bed heating oven's temperature. This method is simple, practical, and high reliability. However, choosing and adjusting PID parameter rely on manual way, it is difficult to choose an appropriate values .Inappropriate values may cause large overshoot and low control precision. Thus, in order to obtain more accurate and rapid PID control parameters and to avoid errors caused by human factors, the fuzzy control and PID algorithm are applied to the fluidized bed furnace temperature control system. The self-tuning fuzzy PID controller is designed. Compared with the outdated control methods, PC control is more flexible and even more long-range.
A New Fault Diagnosis Method of Adaptive Demodulated Resonance Technique Based on Wavelet Packet in Multi-Information Domains
Authors: Liu Cai Qin , Cao Er Ling , Wu Sheng Qiang
Published: September 2012

Fault information is incomplete while using a single information domain fault feature parameters to construct fault feature vector, and demodulated resonance technique have to predetermine resonant frequency and fixed center frequency also has its shortcomings , in order to solve these problems, a new fault diagnosis method is proposed of adaptive demodulated resonance technique based on wavelet packet in multi-information domains. The fault feature vector extracted from multi- information domains is described, signal processing flow of envelope demodulation based on denoising and filtering of wavelet packet is analyzed, the fault diagnosis method of adaptive demodulated resonance technique based on wavelet packet is given, and the method is applied to fault diagnosis of axial piston hydraulic pump. Experiment results show that multi-domain feature vector increases the completeness of the fault information, it is able to obtain good diagnosis effect, and the new fault diagnosis method is able to identify known and unknown faults resonance frequency automatically, the frequency range is narrow, the rate of diagnosis is high.
3D DNA Self-Assembly Model for Minimum Control Sets Problem
Authors: Wang Zi Cheng , Bian Li Zheng , Cui Guang Zhao
Published: September 2012

In this paper, the minimum control sets(MCS) problem was solved by means of DNA self-assemble. We constructed the three-dimensional (3D) DNA molecular tiles and seed configuration to self-assemble. The results show that DNA self-assembly is an effective and feasible method for solving NP problem.
Study on Repairing Motherboard with Fuzzy Reasoning
Authors: Yang Hui , Wu Ru Bin , Liu Jun , Cai Qiong
Published: September 2012

On the basis of comments sets of fuzzy reasoning, fault model and the characteristics of complex motherboard repair, fault model is introduced to diagnosis the motherboard and comments sets is used to reflect the priori knowledge. Data sources are obtained by analyzing the classification of circuit. Fuzzy relation between the chip is analyzed and illustrated by the example. Reasoning model of repairing complex motherboard can be established.
Ag/TiO2 Nano-Membrane Formed on the Surface of Domestic Ceramic for the Enhancement of Photocatalytic Property
Authors: Liu Fang , Zhou Wu Yi , Yang Zhuo Hong , Xiao Su Yao , Cao Yong
Published: September 2012

Silver-incorporated titania (Ag/TiO2) nano-membrane were formed on the surface of domestic ceramic substrates by a sol-gel method with the use of tetrabutyl titanate and silver nitrate as precursors, acetyl acetone and nitric acid as a catalytic inhibitor, absolute ethyl alcohol as the solvent. In the same way, titanium dioxide (TiO2) films were also prepared on the same ceramic substrates. The surface morphology and the crystal structure of the Ag/TiO2 nano-membrane obtained through the method mentioned with different calcination treatment have been discussed by XRD, SEM, DRS and FTIR respectively. Compared with TiO2 nano-membrane, the XRD analysis shows that no significant shift in the crystal structure is presented because of silver ion-doping. From SEM and EDS, it is shown that spheric silver particles are spread on the surface of the nano-membrane and the insights into the compositions were provided by FTIR. DRS analysis showed that the red shift of the fundamental absorption edge of titania could be caused by silver ion-doping.
A Method of Robust Control for Nonlinear Inverted Pendulum System
Authors: Shao Ke Yong , Tian Miao Miao , Wu Qing Yu
Published: September 2012

In this paper, the controller of inverted pendulum with parametric uncertainty and nonlinearity was proposed. The controller was composed of two terms. Control law of linear part of the system was obtained by Coordinate Transfer and Backstepping algorithm. To the nonlinear part and uncertainty of the system which are usually not accords with the form of Backstepping algorithm, a BP neural network was applied to the design of the controller. Method submitted in this paper was less restrictive to the form of the nonlinear system, and has a wider universality. At the end of the paper, simulations proved the effectiveness of the proposed method.
Adaptive Kalman Filter Based Aircraft Ground Icing Thickness Prediction
Authors: Xing Zhi Wei , Zhang Hui , Ren Zhun
Published: September 2012

The nonlinear dynamics model is used to describe the change of aircraft icing thickness and icing deformation accelerations is viewed as dynamic noise in this paper. Then, a dynamic prediction model of aircraft icing thickness is established with the theory of adaptive kalman filter. And the adaptive kalman filter method based aircraft icing thickness prediction model is employed to forecast aircraft ground icing thickness and compared with support vector machine, BP neural network prediction method. The result of the instance simulation and analysis indicates that the adaptive kalman filter method based aircraft icing thickness prediction posed in this paper is reliable, simple and rapid, and the model has high prediction precision which can realize real-time tracking and prediction and has definite value of both theory and practice.