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Table of Content

15 December 2015 Volume 28 Issue 12
  
    Articles
    LED Plano-convex Lens Design for Realizing Uniform Illumination
    LU Xue,DING Guilin
    . 2015, 28(12):  1. 
    Abstract ( 665 )   PDF (959KB) ( 711 )  
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    A plano-convex freeform surface algorithm is presented for uniform illumination.The 3D modeling of the lens is performed based on non-imaging optical core theory of etendue and energy conservation,according to Snell's law,by the establishment of a lens profile curve ODE satisfied by using Matlab in the DDE (Dynamic Transmission) technology and Tracepro complete language in the scheme of dynamic data link,eliminating the need to import 3d software brings curve fitting error,so the modeling becomes more accurate.The results show that the algorithm can achieve uniform illumination in a specific area with a lens diameter of 23 mm and an optical efficiency of up to 51.99% with the light source 10 mm from the lens.

    Spectral Finite Element Analysis of Surface Damage on Metal Beam Structure
    XU Baiqiang,ZHANG Jingxiu,XU Guidong,XU Chenguang
    . 2015, 28(12):  5. 
    Abstract ( 611 )   PDF (865KB) ( 478 )  
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    The spectral finite element method (SFEM) is developed to model the surface-bonded piezoelectric wafer and beam structure.The Timoshenko beam theory,the Euler-Bernoulli beam theory and linear piezoelectricity are used to model the base beam and electric-mechanical behavior of the piezoelectric wafer respectively.The governing equations are obtained in the time domain by using Hamiltons principle,and then the Spectral finite element model are formulated via the fast Fourier transform.The SFEM is used to analyze the frequency response function,admittance characteristics and the influence of damage.The high accuracy of the present SFEM is verified by a comparison with the finite element method (FEM) results.The numerical model and its calculation results provide analysis basis for damage detection and assessment of the practical detection signal.

    Hybrid Concentrating Photovoltaic System Based on Fresnel Lens and Parabolic Reflector
    WANG Yani,LIU Jiansheng
    . 2015, 28(12):  10. 
    Abstract ( 512 )   PDF (1032KB) ( 506 )  
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    A hybrid concentrating photovoltaic system is proposed on the basis of Fresnel lens,which has the converging characteristic to get the light collected to a point.The system uses the parabolic reflector to get parallel light simultaneously.The parallel light is obtained by a point light source reflecting through parabolic reflector,and the point light should be placed on the focus of the parabolic reflector.Preliminary simulation data of the entire concentrating photovoltaic system will be obtained by Zemax.Then the condenser system can be optimized and improved in reference to the simulation results.The comparative analysis shows that the improved system achieves a higher collection efficiency and better utilization.

    A New Lithium-ion Battery Separator Based on PLC
    SHEN Jingfeng,QU Yahao,LI Fusheng
    . 2015, 28(12):  14. 
    Abstract ( 476 )   PDF (1298KB) ( 450 )  
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    A novel automated sorting machine of high i efficiency s developed.This paper focuses on the designs of the measure scheme,mechanical structure,and control system based on the principles of battery measure.Tests show the mechanical structure and control system can operate normally with cell resistance and voltage accuracies of 0.1 mΩ and 0.1 mV respectively,and an increased sorting efficiency by 60%.

    Time Reversal Multiple Signal Classification Algorithm for Imaging of CS Damage
    GU Jianzu,ZHOU Chunjie,LUO Ying,WANG Ziping,XU Chenguang
    . 2015, 28(12):  18. 
    Abstract ( 539 )   PDF (866KB) ( 425 )  
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    The time reversal multiple signal classification algorithm can be applied to the damage detection of concrete structure.The transfer matrix is constructed though the transmitted signals and scatter signals obtained by transducer arrays,and then decomposed to get the singular value that reflects the damage quantity and the singular vectors contain the damage information.The concrete structure is imaged by MUSIC algorithm.Numerical simulation and experiments verify the feasibility of the time reversal imaging method for accurate damage detection of concrete structure.

    Short-term Load Forecasting Based on Daily Feature Extraction of Similar Days and ELM
    MA Lixin,YIN Jingjing,ZHENG Xiaodong
    . 2015, 28(12):  22. 
    Abstract ( 467 )   PDF (716KB) ( 503 )  
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    In order to solve the problems of forecasting method,such as low forecasting accuracy,and long computation time in short-term electric power load forecasting,an approach to short-term load forecasting based on self-organizing feature mapping of similar days feature extraction and ELM (Extreme Learning Machine) combined method is proposed in this paper.Firstly,self-organizing neural network is used to the classification of related data.The data of the same type as that of the forecasting day are found out.Then these training samples are forecasted by ELM,which has strong ability to predict and short computing time.The power load data of one city were used for simulating.The proposed method is compared with ELM and back propagation (BP) neural network.The experimental results show that ELM method based on feature extraction of similar days has high prediction precision,good generalization performance and short running time.

    Acceleration of Image Processing Algorithm Based on Embedded System
    FANG Simin,WANG Yagang
    . 2015, 28(12):  26. 
    Abstract ( 496 )   PDF (614KB) ( 471 )  
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    A transplant method is proposed for timely image processing.A successful mixed Gauss background modeling in OPENCV and the TI DAVINCE DM3730 platform is given to show how to transplant and accelerate the algorithm without affecting the result,covering the fixed point of the algorithm and dealing with the code structure.The experimental results illustrate that this method can satisfy the need of application,and can be used in the floating to fixed point transplantation and in most of the image processing algorithm.

    Simulation of Dead-beat Control of STATCOM Based on Lagranges Interpolation Current Prediction
    XIA Tianyu,YANG Wenhuan,SHI Jun,XIA Minghao
    . 2015, 28(12):  29. 
    Abstract ( 482 )   PDF (733KB) ( 513 )  
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    As to resolve the problem of poor performance of STATCOM due to the inefficient performance of PI controller in drastic fluctuating electric environment,a precise discrete mathematical model of the STATCOM is built and a current prediction method originated from Lagranges interpolation is proposed,which attain a high quality prediction of current,consequently resolving control error caused by time-delay due to digital calculation and improving the instantaneity of the current detection,according to the simulation in Matlab.

    Support Vector Machine Classification Algorithm Based on Genetic Algorithms
    ZHANG Dongdong
    . 2015, 28(12):  32. 
    Abstract ( 514 )   PDF (727KB) ( 508 )  
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    In view of the some existing SVMS issues such as data disproportion and strong dependence on the algorithm structure in the process of multi-classification,a new SVM classification algorithm based on genetic algorithms is proposed.The new algorithm considers the crossover in the genetic algorithm as the choice of divisions in the SVM,improves the correction capability during classification by mutation and bases the optimal classification results on the fitness function.Simulation and tests are performed on sample sets with different characteristics and the result shows the algorithm has superiority in data balance,speed and accuracy of classification in the case of multi-classification.

    An Improved Scheme with Average Value Method for ART Algorithm
    SU Dongqi,YAO Wei,XU Boqing
    . 2015, 28(12):  36. 
    Abstract ( 548 )   PDF (1031KB) ( 481 )  
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    In two-dimensional tomography field,the biggest problem algebraic reconstruction technique (ART) algorithm faces is the large calculating quantity that causes its low reconstruction speed,for which an improved ART algorithm is proposed in this paper.It aims at getting good quality faster.All the transition solutions during each iteration process are recorded and their average value is the initial value of the next iteration.Experiment results indicate that the improved algorithm can get good quality with less iterations and has better quality than traditional algorithm.

    Research on Cuckoo Search Algorithm Based on Quantum Mechanism
    WANG Jian,DING Xueming,DONG Xinyan
    . 2015, 28(12):  40. 
    Abstract ( 476 )   PDF (806KB) ( 452 )  
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    Aiming at the disadvantages of the basic cuckoo search(CS) algorithm such as weaker local search ability,slower convergence rate and poorer optimization precision,this paper studies the quantum inspired cuckoo search algorithm.Firstly,we enabled the cuckoos with heterogeneous search behaviors towards the nests with the help of quantum mechanism.Then three measures which can improve the cuckoos local search capability were introduced on this basis,namely the introduction of a similar inertia weight to the equation of renewal of the nests positions,an adaptively decreased probability of the cuckoo nests being replaced with a randomly generated new one,and the improvement of increment with a random disturbance.A graphical comparison of the original CS algorithm and the quantum one used for optimization of two kinds of benchmark functions shows that the latter algorithm possesses greater advantages over the original one with a better precision.

    TLD Target Tracking Algorithm Based on Particle Filter
    GU Wenhua,JIANG Nianping,LI Zhenxing
    . 2015, 28(12):  45. 
    Abstract ( 583 )   PDF (778KB) ( 460 )  
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    The stability and tracking performance of TLD tracking algorithm decreased significantly with rapid changes in speed moving targets,goals lost in a complex background,or large shelter.The particle filter is introduced to the TLD algorithm tracking module to offer better complex background track fast-moving target as well as long-term stability.Experiments in OpenCV and VS2010 show that the improved TLD algorithm can better track fast-moving target,increasing the tracking stability and robustness.

    Prediction and Countermeasures of Infectious Diseases Based on ARIMA
    GUI Tengye,CHEN Shuo,WEI Lizhi,CUI Zhijun,ZHOU Xiaolin
    . 2015, 28(12):  48. 
    Abstract ( 533 )   PDF (739KB) ( 406 )  
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    An autoregressive integrated moving average model (ARIMA) based on the characteristics of infectious diseases changes is proposed for accurate prediction of the epidemics.Firstly,the original data is preprocessed smoothly by the model,which is also used to eliminate the abruptness and the characteristics of seasonal and cyclical.Then the ARIMA is used to build a model of data that has been smoothed.We use the data,the morbidity of influenza in a city,to simulate the results of the experiment,which shows that ARIMA can capture the regulation of the variation of infectious diseases well,and improve the accuracy of the prediction.It is an efficient approach to predicting the epidemic,which also provides support for decision-making in epidemic prediction and monitoring.

    Four-rotor Unmanned Aerial Vehicles Control System Based on PID Controller of Artificial Fish Swarm Algorithm
    FANG Xuan,ZHONG Bocheng
    . 2015, 28(12):  52. 
    Abstract ( 436 )   PDF (861KB) ( 402 )  
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    The tuning of PID parameter of the Four-rotor by trial and error method suffers low accuracy and unstable performance.The global artificial fish swarm algorithm is applied to search the optimal solution in the global scope by preying,following,swarming,etc.The principles of the artificial fish swarm algorithm and PID algorithm are introduced.The application in the Four-rotor unmanned aerial vehicles control system of the algorithm is described in detail.Simulation results show that the controller has better response,adaptability and robustness.

    An Improved  Complex Correlation Algorithm for Doppler Radar
    LI Erxiao
    . 2015, 28(12):  56. 
    Abstract ( 397 )   PDF (608KB) ( 421 )  
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    The complex correlation algorithm is often used in calculating Doppler shift of the echo.But it will lead to a big deviation from the actual value in practical application because of the interference of noise.An improved complex correlation algorithm is brought up in the article.The algorithm is enhanced in noise-processing field by presampling the signal of noise.And the result is verified through simulation experiment.Through the result,the new complex correlation algorithm can lead to a better result in calculating Doppler shift normal complex correlation algorithm.

    Design of Energy Management System for Electric Vehicle Charging Station Based on Multi Agent
    TAO Yaohuan,Wang Shaojie,ZHANG Xianshuai,WANG Wenhua
    . 2015, 28(12):  59. 
    Abstract ( 567 )   PDF (905KB) ( 485 )  
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    This paper uses the UML unified modeling language to perform electric vehicle charging station energy management system modeling for charging,power grid load adjustment and the maximum profit of charging station.The overall functions of the electric vehicle charging are analyzed and integrated from the angle of energy scheduling with energy management system based on multi agent system (MAS).All parties in the charging are considered as adaptive agents,whose decision-making is optimized through interactive communication,thus simplifying the control problem of complex system.A comprehensive development model framework is established by the UML object oriented development,laying the foundation for the subsequent system software engineering and hardware configuration.

    Realization of Touch Screen's Driver with Linux Input Subsystem
    WANG Xin,KONG Yong
    . 2015, 28(12):  62. 
    Abstract ( 470 )   PDF (786KB) ( 408 )  
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    In this article,the principles of Linux input subsystem driver module are introduced and analyzed.The touch screen driver is designed for Linux input subsystem with the ARM embedded processor of SC32440 as hardware platform.And the contact coordinates of the touch screen and contact tracking are realized on the SC32440 hardware platform.

    Design and Realization of Monitoring System Based on Taxi Gas Bottle
    FENG Junjun,FENG Junsheng
    . 2015, 28(12):  66. 
    Abstract ( 492 )   PDF (770KB) ( 457 )  
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    With the popularity of the diesel engine to gas engine taxi,the safety of taxi gas bottle aroused more and more concerns.This paper describes a diesel engine to gas engine taxi gas bottle monitoring system design scheme based on CC1110.The system is based on near field communication technology,which assesses the current security level of the gas bottle through the parameter monitoring,while the monitoring data is displayed allowing users to keep abreast of the security status of the gas bottles.Tests show the high sensitivity and stable data transmission of the monitoring system.

    Research on Intelligent Design System Based on CBR for Scissor-lift
    WANG Gan,Shen Jingfeng
    . 2015, 28(12):  69. 
    Abstract ( 527 )   PDF (921KB) ( 428 )  
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    In order to provide a more efficient knowledge service to the designer in mechanical design,we propose an intelligent design method based on case-based reasoning.The key technology and systems analysis framework for case-based reasoning are presented with Visual Studio as the scissor lift intelligent design system development tool to achieve the rapid generation of new product designs and to enhance the competitiveness of enterprises.

    Automotive Oil Pump Performance Testing System Based on LabVIEW
    SUN Meng,ZHANG Zhendong
    . 2015, 28(12):  73. 
    Abstract ( 604 )   PDF (840KB) ( 467 )  
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    A set of oil pump performance testing system based on automotive oil pump is designed for the problems of complex operations,data inaccuracy and low efficiency in the handle testing of oil pump.With the help of LabVIEW environment and data acquisition card,this testing system tests the automobile oil pump performance with NI-USB 6210 data acquisition card to collect fuel pressure,fuel flow,pump working voltage and current parameters.PC interface is compiled by LabVIEW to realize the control parameters setting,pump performance evaluation,data display,storage,query and other functions based on historical records.The experimental results show that the testing time of this system is reduced by 90% with dramatically improved accuracy and efficiency compared with the traditional test method.

    Study of Blast Furnace Gas Washing Facilities Safety Based on WSN District Monitoring
    YUE Tingting,SHEN Yaya
    . 2015, 28(12):  76. 
    Abstract ( 532 )   PDF (833KB) ( 406 )  
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    An improved algorithm based on partition of wireless sensor network (WSN) monitoring used for monitoring and managing blast furnace gas facilities is proposed for the safety of blast furnace gas equipment.Wireless sensor nodes are laid out in a certain way in the device,forming a monitoring network to collect data,which are analyzed by the algorithm to convey the corresponding operating instructions or sound the alarm.According to the simulation graphics,this algorithm can detect the problems more quickly,effectively improving the safety of blast furnace gas washing equipment data analysis and early warning.

    Face Detection Based on YCbCr Skin Color Model and Improved Adaboost Algorithm
    ZHAO Zhe,HOU Jun
    . 2015, 28(12):  80. 
    Abstract ( 547 )   PDF (838KB) ( 468 )  
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    This paper proposes a method based on YCbCr color model and Adaboost face detection to improve the accuracy of face detection.Firstly,the algorithm uses the YCbCr skin color threshold model to determine the area to be detected.Then Adaboost algorithm is applied to locate the position of face.To avoid the degradation during training in Adaboost,the paper proposes a new method about suppression of weights updating in training of Adaboost algorithm.

    Tube Detection in Low-contrast Chest
    XU Wentao,CHEN Sheng
    . 2015, 28(12):  84. 
    Abstract ( 531 )   PDF (872KB) ( 421 )  
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    In the intensive care unit (ICU) a portable chest X-ray machine is used by clinicians to help monitor the progression of the patient and identify the location of various medical tubes in the patient's body.However the chests from the portable chest X-ray machine have the defects of low contrast,noise,and vague image of tubes on chests,making it difficult for radiologist to locate the tubes.This study presents a method for detecting tubes in ICU portable chest X-ray image.First a contrast limited adaptive histogram equalization (CLAHE) process is performed on the patient's chest obtained to adjust the contrast information.Then bilateral filtering is used to smooth the chest and keep edge at the same time.Finally the tube detection is done on the image.The approach was applied on about 100 images taken from a portable chest X-ray machine,the results show that the proposed method can effectively detect the tubes in ICU chest radiographs with an accuracy approaching 90%.

    Test Platform of Automotive Instrument Using HIL and Machine Vision
    ZHENG Yunlei,HUANG Yingping
    . 2015, 28(12):  88. 
    Abstract ( 583 )   PDF (1065KB) ( 444 )  
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    This paper presents an efficient approach for design validation of automotive instruments because of low efficiency of manual testing nowadays.The approach combines hardware-in-the-loop (HIL) and machine vision technologies.The system developed can simulate vehicle operations in real-time basis and inspect visual display of the instrument with an intelligent camera.A host computer controls the whole operation process and conducts fully-automated design validation testing.The simulation models and the image processing algorithms are introduced.Experiments are performed for validation of the functionalities of the light status,the needle pointer status and the character display in a laboratory testing platform,verifying the accuracy and stability of test results and showing the practical value of this system.

    Development of BACnet Network Node Platform
    LI Li,FU Dongxiang
    . 2015, 28(12):  92. 
    Abstract ( 578 )   PDF (967KB) ( 496 )  
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    This paper introduces the application of BACnet protocol and transplantation of protocol stack,proposes a brief method on designing stacks interactive model,and presents the process of transplanting into STM32 demoboard.This method analyzes the implementation process of every layer in BACnets structure including application layer,network layer and data link layer.Transplantation is based on the BACnet-stack-0.8.2 version,with the BACnet stack tailored and transplanted according to standard objects function and hardware configuration.The STM32 demoboard is transformed into a BACnet node device which can communicate with virtual device in PC through RS485 and fulfill services like read and write properties.

    Lane Line Parallel Detection Based on Hough Transform
    WANG Sai,XU Boqing,SU Dongqi
    . 2015, 28(12):  96. 
    Abstract ( 502 )   PDF (828KB) ( 453 )  
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    A lane line detecting method based on Hough transformation is proposed to improve the robustness.A parallel accelerated processing technology is adopted to improve the speed of detecting line for Hough transformation.The image to be detected is divided into two interesting regions assigned to two CPUs respectively for processing.Then the two independent detecting results are combined.The experiment results indicate that the detecting speed is increased by 39.1% with higher quality and efficiency than traditional serial detecting.

    Gray Multi-Focus Image Fusion Based on Redundant Wavelet Transform
    DONG Jiapeng,HE Jianzhong
    . 2015, 28(12):  100. 
    Abstract ( 457 )   PDF (767KB) ( 486 )  
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    This paper presents a gray multi-focus image fusion algorithm based on redundant wavelet transform for more efficient image fusion.Different focus gray source images are selected for redundant wavelet transform.The concepts of regional and local contrast vector norm of the construction of new fusion rules of arithmetic are introduced according to the characteristics of frequency coefficients respectively.Experiments show that the proposed method offers better efficiency and accuracy than other fusion algorithms.

    Design and Implementation of Grey Relation Analysis System
    CHEN Baoping
    . 2015, 28(12):  104. 
    Abstract ( 442 )   PDF (707KB) ( 409 )  
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    A grey relative analysis system consisting of five basic grey relative analysis methods is designed using Visual C+[KG-1.5mm]+ language.The core data is imported into the system through Excel and processed by Object Link Embedded automation techniques,thus a simplified operation.Result for each step of different methods is displayed for convenient grasp of the process of data variation.The experimental result shows that the system has characteristics of simple operation,high practicality and accuracy.

    Color Correction Technology for Banknote Image Based on Iterative algorithm
    LIU Mengtao,JIN Xiaofeng,LIU Daoyu,LIANG Tiancai
    . 2015, 28(12):  107. 
    Abstract ( 566 )   PDF (998KB) ( 478 )  
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    The light source,photosensitive chip and operating temperature of the CIS may lead to partial color in the banknote image acquisition,which affects the performance of the recognition algorithm.Color correction method for banknote image based on iterative algorithm is proved.Equivalent circle method and Gamma transaction are used concretely.These methods relieve the interference of the partial color,increase the efficiency of the engineering technical personnel,and improve the performance of the recognition algorithm.

    Design and Implementation of Lexical Analyzer in Program Source Code Similarity Measurement
    YU Haiying
    . 2015, 28(12):  110. 
    Abstract ( 486 )   PDF (930KB) ( 422 )  
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    A design and implementation scheme of lexical analyzer based on language dictionary is proposed for lexical analysis in program source code similarity measurements.The program source codes are converted first into a string,which is decomposed character by character to obtain each token of the program source codes,whose type is judged for lexical analysis.Experimental results show the scheme can effectively analyze the lexical structure of the program source codes.

    SCPI Parsing Based on Static Linked List
    ZHAO Yun
    . 2015, 28(12):  114. 
    Abstract ( 502 )   PDF (958KB) ( 661 )  
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    This paper designs a convenient transplantation and extension of SCPI language parsing method.This method saves the SCPI command set with static chain table structure.The SCPI parsing module established by this method,enjoys little memory consumption and convenient transplant and extension.This method can be applied to various intelligent programmable instruments and work under the applicable in embedded systems.

    Research on and Design of ZigBee Wireless Communication Network Based Security System
    MA Xiaoyan,XU Gui,MA Xiaojuan
    . 2015, 28(12):  117. 
    Abstract ( 588 )   PDF (862KB) ( 495 )  
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    The model that capture the key information captured at termination and wired communications with the surveillance center based on traditional security systems easily leads to complex wire,high cost,poor flexibility and blind spots due to the terminal equipment limited monitoring ability and lacking information shared.A security platform is proposed and designed using ZigBee wireless communication network to solve the problem.A communications network with stable performance is built via ZigBee in the monitoring area,enabling various subsystems to collect appropriate data and information under the network environment and upload to the monitoring center through ZigBee wireless communications network,thus intelligent and efficient information sharing.

    Design of Cable Fault Data Terminal Based on Android Platform
    GUO Kun
    . 2015, 28(12):  121. 
    Abstract ( 617 )   PDF (904KB) ( 444 )  
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    A cable fault data terminal using mobile phones to undertake part of tasks of the cable fault location is proposed to solve the large size,complicated operation and high cost of conventional cable fault locating equipment.The system uses the FPGA as the core of the measuring instrument.An application is developed by App Inventor 2,using Bluetooth to connect cable fault location system.The phone can process data and display the data.The experimental results show that this measurement system has improved running speed,simple operation,portability and friendly interface.

    Application of Wireless Transmission in Fuel Control System
    ZHANG Genyuan,LIU Zilong
    . 2015, 28(12):  125. 
    Abstract ( 889 )   PDF (694KB) ( 454 )  
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    A wireless refueling controlling system based on STM32 controller and nRF24L01 wireless radio frequency transmission module is proposed for the complex wiring,high cost and scattered equipment of traditional refueling system.The system can be divided into master station (for real-time display and communication with the PC) and slave stations (for measuring parameters of oil pressure and liquid level).Master/slave stations set up wireless communication network by using Star-shaped pattern for data transmission.The test results indicate that the system works stably and realizes reliable short range point-to-multipoint wireless communication.

    Design of Environment Monitoring System of Subway Tunnel Based on GPRS
    YAN Lidong,SUN Mingwei
    . 2015, 28(12):  129. 
    Abstract ( 578 )   PDF (797KB) ( 519 )  
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    A wireless environment monitoring system based on GPRS is designed for subway tunnels with special requirements for temperature,humidity and CO gas.The data collection terminal is used for getting environmental parameters.By using GPRS as the wireless transmission network,wireless data transmission between host computer and field computers are completed.The MCU of the data collection terminal is LPC2210.The system can meet different GPRS network access scenarios by software modification.The experiment results show that the system can meet the designed requirements.

    Liquid Mixing System Based on Fuzzy Self-tuning PID
    SHENG Yan,ZOU Xuan
    . 2015, 28(12):  132. 
    Abstract ( 584 )   PDF (734KB) ( 376 )  
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    PID control theory is utilized to deal with the problems of simple input/output control,discontinuous liquid mixing and poor accuracy.There are some problems in traditional PID control,such as troubles in adjustment after the state change of the system,large overshoot and long setting time.In combination with the fuzzy theory,flow valves are adjusted and all disturbances in the system will be eliminated to achieve the accurate mixture.PLC realizes the fuzzy self tuning PID and manages with input/output control.It has advantages of continuous and discontinuous operation,less overshoot and good robustness.Its overshot is 36% less than that of the traditional PID.Moreover,the setting time is reduced by 3 seconds with higher production efficiency and lower labour cost.

    A New PID Experimental System Based on Industrial Model
    WANG Qian,JIANG Nianping
    . 2015, 28(12):  136. 
    Abstract ( 420 )   PDF (667KB) ( 465 )  
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    Traditional PID experimental systems based on Matlab simulation are not only short of actual control objection but also abstract.This paper designs and implements a new PID experimental system based on the industrial model.The industrial motor control model is added to the original simulation with LPC2114 as the core processor and L298N for the DC motor control system of motor driven.PID real-time control is performed by Matlab programming.The experiment proves that the system reflects the influence of PID parameter changes on the system and the effect of PID industrial control while retaining the accuracy of the Matlab simulation experiment,and improves the visibility of PID experimental system.

    IMC-PID Controls Based on Neural Network for Ultrasonic Motor
    JIANG Nianping,ZHANG Qi
    . 2015, 28(12):  139. 
    Abstract ( 531 )   PDF (751KB) ( 425 )  
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    A variable gain internal model control PID (IMC-PID) based on neural network is proposed for better ultrasonic motor control.The IMC-PID simplifies the parameters setting of PID controller with only one parameter needed to be adjusted.The neural network is introduced to adjust the parameters to make up for the nonlinear problem for ultrasonic motor.The response relationship between input and output and the smaller steady-state error is found.The experiments proved that ultrasonic motor control by using this control system offers good adaptability to characteristics variation and load disturbance.

    Design of a Low-cost Isolated Flyback Switching Power Supply Based on Li-battery
    WANG Haipeng,LIU Lu
    . 2015, 28(12):  143. 
    Abstract ( 480 )   PDF (897KB) ( 464 )  
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    A new low-cost isolated flyback switch Li-battery power supply is designed for battery-powered medical instruments with high voltage and isolated function.The chip with current type of pulse width modulation (PWM) UC3845 and a feedback circuit are used to realize the isolate and dual-output function.The input of the designed power is 10~14 V and the dual-output are +35 V and -35 V.The consumed power is 14 W with an efficiency of 75%.The size of the module is 65 mm×40 mm.The simulation and experiment results validate that the power supply module can realize the ±35 V power isolated supply.

    Optimal Design of Power Integrality in High Speed PCB
    LIU Xuejie,GAO Jin
    . 2015, 28(12):  147. 
    Abstract ( 392 )   PDF (764KB) ( 476 )  
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    The power integrality theory is applied to PCB design to address the abnormal operation of the integrated circuits caused by voltage drop in high speed image information processor of air-to-air missiles.Effective solutions to the integration of power in high speed PCB are proposed with voltage drop confined to 0.5%,providing a reference for the design of high speed PCB that is becoming more and more complicated.

    Fast Design of IIR Digital Filter Based on Matlab
    WANG Haoyuan,SHI Zhan,CUI Yongjin
    . 2015, 28(12):  150. 
    Abstract ( 576 )   PDF (819KB) ( 429 )  
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    A fast design method of IIR digital filter by means of analog filter is presented for the abstract concept and complicated numerical calculation of digital filters.A design system of the IIR filter under the Matlab environment is proposed.The design programs and the run results show that this method offers simpler filter programming and higher design efficiency.

    A Novel Design of the Dual Loop Broadband Circularly Polarized Microstrip Antenna
    SU Dan,ZHU Yongzhong,DENG Xin,LIU Ying
    . 2015, 28(12):  153. 
    Abstract ( 520 )   PDF (900KB) ( 407 )  
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    A new type of dual loop broadband circularly polarized antenna is designed and fabricated to overcome the microstrip antennas disadvantages of narrow inherent frequency band,low radiation efficiency,and small possibility of high gains.The patch unit of the antenna uses the slot/strip configuration composed of a slot loop and a strip loop.The slot loop offers a minimum AR point at a lower frequency while the strip loop offers a minimum AR point at a higher frequency.An appropriate combination of the two minimum AR points can result in a significant enhancement for the circularly polarized bandwidth.A broadband balun is used for the feeding of the antenna and the impedance matching.Simulation and measurement results of the fabricated antenna with optimized parameters exhibit a broadband impedance bandwidth (VSWR≤2) of,37% an axial ratio (≤3 dB) of 29.8%,and a gain up to 6.4 dB.

    A Direction-Finding Method Based on Harmonic Analysis of Two-Element Time Modulated Arrays
    GAO Fei,HUANG Bo
    . 2015, 28(12):  158. 
    Abstract ( 536 )   PDF (630KB) ( 438 )  
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    A novel direction-finding method based on harmonic analysis by the time-modulated array (TMA) is proposed.Compared with the complex system and higher cost of conventional direction-finding method,the proposed method requires only two antenna elements and two single-pole single-throw switches.The signal processing of the proposed method is concise and its calculation amount concentrates on the discrete Fourier transform (DFT),which reduces the cost of signal processing.Numerical simulations are provided to examine the performance of the proposed method,showing good accuracy.

    New Method by Only TOA for Multi-station Passive Location in Uncommon-View
    ZHENG Lihui
    . 2015, 28(12):  161. 
    Abstract ( 496 )   PDF (682KB) ( 398 )  
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    In view of the failure of almost all the methods of the multiple stations passive location in the uncommon-view,this paper propose a new method using only the time of arrival (TOA) in this situation.The TOA train of every net point is produced and the one that is most like of the real train is the excellent.Then the paper analyzes how the components affect the location precision such as the TOA-error,the distribution of the stations,the distances between the substations and the main-station and the observation time.The results of the emulation prove that a precision close to the CRLB lower limit can be achieved without considering the error of the station address and the clock synchronization.

    Closed-loop Identification Algorithm Based on Biased Relay Feedback
    WANG Zaibo,ZHAO Min
    . 2015, 28(12):  164. 
    Abstract ( 508 )   PDF (575KB) ( 369 )  
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    Multivariable process object has a coupling characteristic frequently.There usually are some loops with inoperable variable,when decoupling those processes.This will make the identification of objects more difficult.A close-loop identification algorithm based on biased relay feedback is proposed in this paper.The identification of objects is realized by biased relay feedback.This method can find a main frequency band of the objects after analyzing and discussing the input and output signals.Thereby it will get an accurate model.Simulation examples show accuracy and applicability of the identification method for a wide range of processes.

    Research on Processing and Storage Mode of Big Bata
    SUN Hong,HAO Zeming
    . 2015, 28(12):  167. 
    Abstract ( 537 )   PDF (1099KB) ( 514 )  
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    Based on the characteristics of big data,the paper proposes quickly recognizing top search queries by the tag cloud.It also introduces the advantages of the traditional data warehouse in query and storage structure,and puts forward a different method of data transfer from the traditional ones in the collaboration mode,which is based on the combination of data warehouse and Hadoop platform.The data middle ware is used,and a comparison between the time taken for the same quantity of records to be introduced into Hadoop shows that the method proposed is superior to Sqoop.

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