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15 March 2018 Volume 31 Issue 3
  
    Articles
    Research on Transient Impulse Current Suppression Algorithm for Three Phase Asynchronous Motor
    ZHOU Min, DAO Wei-Han, CUI Yue, LIU Jian-Feng, LIU Meng-Yang
    . 2018, 31(3):  1. 
    Abstract ( 1012 )   PDF (974KB) ( 273 )  
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    In view of the problems of transient impulse current in the V/F control asynchronous motor speed control system which is widely used in the industrial field at present, In this paper, an experimental platform based on V/F control is designed, and based on the analysis of transient current over current, a new method to detect and suppress the transient impulse current is proposed. Through the design of the hardware and software, the three kinds of common phenomena are tested. The experimental results show that the proposed algorithm can effectively suppress the impulse current in the V/F control system, and has the advantages of simple implementation and low cost.

    Multi-Objective Particle Swarm Optimization Based on Dimensional Learning for Solving the Disassembly Line Balancing Problem
    XIAO Shan-Li, WANG Yu-Jia, XU Hui
    . 2018, 31(3):  5. 
    Abstract ( 354 )   PDF (660KB) ( 189 )  
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    Focus on the complexity of disassembly line balancing problem (DLBP) increases with the number of parts of the product, a multi-objective particle swarm optimization based on dimensional learning (DL-MOPSO) is proposed. Firstly, the mathematical model of DLBP with four decision objectives is constructed based on the characteristics of DLBP. Then according to the mapping relation between particle position and disassembly sequence, the optimal disassembly sequence is obtained by updating the positions of the particles. Finally, the results from testing in using series of instances with different size verify the effect of proposed algorithm.

    Design of a Novel and Small Size UWB Antenna With Triple-Band Notched Characteristic
    CA Ji-Zhou, GUAN Ba-Ran
    . 2018, 31(3):  10. 
    Abstract ( 430 )   PDF (1107KB) ( 224 )  
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    A novel and small triple-band notched UWB antenna property is proposed. The proposed antenna that composed of a circular patch, a defected ground and a pair of split resonant rings fed by 50Ωmicrostrip. The triple rejection is achieved by etching an annular ring radiating patch with a pair of Y-shaped resonant elements that are embedded inside the patch, a U-shaped patch on the ground and a pair of split resonant rings. The fabricated antenna has a tiny size, only 30 mm×30 mm×1.6 mm. The experinental and measured results show that the proposed antenna exhibits an impedance bandwidth over an ultra-wideband frequency range from 2.9 to 10.7 GHz with return loss less than -10dB, except three stopbands at 3.7~4.2 GHz, 5.15~5.825 GHz and 7.9~8.4 GHz for filtering the C, WLAN and X band signals respetively. It also demonstrates a nearly omnidirectional radiation pattern and a stable gain. The simulated results are compared with the measured performance and show good agreements.

    imulation and Optimization Design of the Layout between Laser Communication System and Lunar Observing Ground System
    TANG Zhang-Yuan, JIAN Xian-Zhong
    . 2018, 31(3):  13. 
    Abstract ( 298 )   PDF (1186KB) ( 203 )  
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    In order to optimize the layout problem between lunar observing ground system and laser communicating system, it is essentially to avoid higher radiation intensity from laser scattering energy in the detector of lunar observing ground system. STK is used to demonstrate that the space is intersecting between the detecting regions of lunar observing ground system and laser propagation regions. A mapping classification algorithm is suggested to analysis the distribution of laser scattering valid points. Combining with laser scattering atmospherically characteristics, the optimized layout is obtained. The trend of laser scattering intensity distribution based on laser scattering valid points is in accordance with laser total scattering distribution, demonstrating the correctness of this method. The result provides a new effective engineering method to optimize those problems between laser sources and observation system.

    Finite Element Method for Thermal Effect of Laser Irradiating Materials
    XU Feng, HAN Yi-Beng
    . 2018, 31(3):  17. 
    Abstract ( 308 )   PDF (941KB) ( 236 )  
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    For the problem of the thermal effect of laser irradiating optical lens, using finite element method to deduce the finite element scheme for solving heat conduction equation of optical lens model and calculating the temperature field distribution in optical lens based on pulsed laser irradiation by using the MATLAB program. The results show that the temperature of optical lens decreases with the increase of laser spot radius and increases with the number of laser pulses increasing which is not significant for rising the temperature of the materials by the cumulative effect of laser energy. Increasing with the increase of the laser power that is a significant factor to affect the materials temperature. When the power of the laser increases to a certain numerical that is 250mw will cause the optical lenss damage caused by melting the material.

     Simulative Method of Refraction Star Map
    SUN Long, CA Jia-Nan
    . 2018, 31(3):  21. 
    Abstract ( 267 )   PDF (611KB) ( 164 )  
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    The navigation method based on stellar refraction is a promising method. The real refraction star map is unpractical because of the costly experiment of spaceflight. To solve this problem, a simulative method of refraction star map is presented in this paper. In this method, the refraction angle of starlight is calculated by combining the atmospheric refraction model and the starlight refraction geometric equation, and the declination and declination can be achieved. Then we can get the refraction stars position on the image plane of stellar sensor by using the star map simulation method. The sensor noise and environment noise are considered in this method and which has been verified by the simulation results.

    Analysis of Reflection of Signal Integrity in High-speed Circuit Design
    LEI Pei, MU Beng-An, XU De-Dun
    . 2018, 31(3):  24. 
    Abstract ( 442 )   PDF (1121KB) ( 286 )  
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    For the problem of signal integrity in high-speed circuit design ,the article gave reasons of signal reflection phenomena through theoretical analysis and calculation for equivalent circuit of transmission line in high speed circuit.Mainly introduced two kinds of  termination matching methods to eliminate reflection,and expounded the principle of six kinds of impedance matching methods in detail .At last, made a reflex simulation for a point to point signal transmission network by the use of SpecctraQuest tools from CADENCE company,and given the simulation results of different impedance matching modes .The results show that the appropriate impedance matching can improve the reflection phenomenon in signal transmission.

    A Barrier Coverage Method for Camera Sensor Network
    YOU Bing-Ji, XU Xiang-Hua, WANG Ran
    . 2018, 31(3):  28. 
    Abstract ( 218 )   PDF (889KB) ( 203 )  
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    For the full-view coverage requirement, this paper proposes a barrier coverage method by selecting as few camera sensors as possible with direction determination. The network is divided into grids based on the discretization processing method and analyzed whether it can be full-view covered or not, then the shortest path of the full-view coverage is selected by the utilization of the Dijkstra algorithm. We propose a non-conflict selection algorithm to select the minimal covering set to form a camera barrier. Experimental results show that the proposed method has good performance for multiple working directions camera sensor network.

    A Sensor Node Selection Method Based on Fuzzy Programming in Wireless Sensor Networks
    CHU Wei-Jian, XU Xiang-Hua, CHENG Zong-Mao, WANG Ran
    . 2018, 31(3):  30. 
    Abstract ( 265 )   PDF (398KB) ( 183 )  
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    This paper presents a novel fuzzy-programming based sensor selection approach for the field reconstruction in wireless sensor networks. The information of the interpolation point is predicted by using the inverse distance weighted interpolation method and the normal operating probability of each node is computed based on the principle of inclusion-exclusion. Then, the minimal number of the required sensor nodes is computed by the utilization of the 0-1 integer programming to achieve the requirements of normal operating probability, accuracy of each node. Whats more, the fuzzy-programming is used to compute the required sensor number according to the error threshold and the fuzzy operating probability. We evaluate the 0-1 integer programming and fuzzy-programming based on the temperature sensor data. The results show that the fuzzy programming algorithm can reduce the number of sensor nodes by about 35% compared with 0-1 integer programming under the same constraint.

    Research Progress of Dimensionality Reduction Technology on High-dimensional Data
    LIU Jing, DIAO Feng-Yu
    . 2018, 31(3):  36. 
    Abstract ( 681 )   PDF (436KB) ( 286 )  
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    Dimensionality reduction technologies is a technique designed to map high-dimensional data to a high-dimensional space to find a compact structure of data, which facilitates further processing of the data. With the rapid development of multimedia and computer technology, the data dimension grows explosively, which makes the image processing, machine learning and other areas of data analysis becomes increasingly difficult, in order to eliminate the problem of the dimension disaster, the researchers put forward a series of solutions. In order to explore the practicality of these dimensionality reduction technologies, this paper introduces the traditional dimensionality reduction technologies and the dimensionality reduction technologies in recent years, then analyzes the performance of the typical dimensionality reduction technologies. Finally, the problems that still exist in the dimensionality reduction technologies are pointed out and some suggestions about future research work are discussed.

    Research on PE Model Three-Dimensional Electromagnetic Environment Calculation Method
    JIN Hui-Qin, WANG Zheng-Lei, ZHOU Xin-Li
    . 2018, 31(3):  39. 
    Abstract ( 301 )   PDF (723KB) ( 214 )  
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    The core of battlefield electromagnetic environment is electromagnetic environment calculation. Two-dimensional propagation is considered in PE model. Terrain profile acquisition on GRID is the basis for three-dimensional electromagnetic environment calculation on PE model. The three-dimensional electromagnetic environment calculation method based on GRID digital elevation model is given. The method is divided into terrain profile partition, profile parameters acquisition and calculation, three-dimensional electromagnetic data generation and multiple radiation source electromagnetic environment superposition.  The two-dimensional PE model is extended to three-dimensional in laying the foundation for the simulation software design.

    Research on Speech Signal Reconstruction Based on Orthogonal Matching Pursuit Algorithm
    CHEN Yi, LI Wen-Jun
    . 2018, 31(3):  44. 
    Abstract ( 333 )   PDF (792KB) ( 209 )  
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    Compressed sensing theory is a new sampling theory based on the sparsity of signal in recent years. Orthogonal matching pursuit algorithm is one of the typical reconstruction methods, aiming at the problems in speech recognition, using orthogonal matching pursuit algorithm for signal reconstruction of speech signal reconstruction algorithm, compared to the traditional compressed sensing is more suitable for the noisy speech, reconstructed speech quality will be higher, the denoising effect it will be more obvious. The basic research on the performance of speech signal CS is of great practical value and significance.

    Optimization for Heterogenuous Data Index Based on Decision Tree Classification
    ZHENG Bo-Wen, DIAO Feng-Yu
    . 2018, 31(3):  48. 
    Abstract ( 333 )   PDF (827KB) ( 195 )  
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    The massive data index is an important means to improve the query efficiency of massive data in distributed environment. In order to construct an efficient index structure, Some heterogeneous data index optimization methods have proposed. This paper gives the index optimization method based on the index of decision tree classification , Firstly, an index decision tree is build up based on data tables and their index. then an index structure is obtained according to decisions given by the decision tree for each subspace. A global level index structure can be created based on local index. The two level index structure can used to rapid position index information and reduce data searching time. Finally, the experimental results show that the index of decision tree is a proper method to optimize heterogeneous spatial data index.

    Design of A K-band Power Distribution Network Based on Waveguide
    ZHANG Li-Jing
    . 2018, 31(3):  53. 
    Abstract ( 313 )   PDF (713KB) ( 251 )  
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    In view of the K-band miniaturization power combining, this paper describes an plan by combining the waveguide power distribution and the waveguide-to-microstrip. A six-channel power distribution network is designed in this paper. By combining three-channel waveguide power divider with waveguide-to-microstrip  transition of double probes, and using software to design and optimize, the six output ports achieve good magnitude and phase consistency in 24-26 GHz。The network which has very low insertion loss and return loss is applied widely to the field of millimeter wave high power combining.

    3D Surface Topography Modeling and Research for Ultrasonic Grinding
    LI Hu, LIU Zhong-Dong
    . 2018, 31(3):  56. 
    Abstract ( 297 )   PDF (897KB) ( 162 )  
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    In order to research the 3d topography of ultrasonic grinding workpiece, 3d topography of grinding wheel surface is established. Through analyzing ultrasonic grinding grain trajectory, model of grinding grain workpiece surface cutting process was established. Put forward the path of a large number of random distribution of abrasive cutting workpiece discrete algorithm and minimum height value envelope surface extraction algorithm, implements the establishment of ultrasonic grinding 3d surface topography. , Results of ultrasonic vibration experiment show that the model can effectively predict the surface morphology of ultrasonic grinding, and provides theory basis for ultrasonic grinding process optimization.

    Design of Multi Point Temperature Monitoring System Based on DS18B20
    GU Jian, LI Ban
    . 2018, 31(3):  61. 
    Abstract ( 567 )   PDF (754KB) ( 250 )  
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    Multi point temperature measurement system is widely used in industry. The digital temperature sensor DS18B20 is used to realize the multi point temperature monitoring system, which has the advantages of high sensitivity, high precision, wide range, low power consumption, small size and so on. Multi point temperature monitoring system based on digital temperature sensor DS18B20 is designed. The test results show that the system can achieve the expected accuracy, and can set the upper and lower limits of alarm temperature according to the needs.

    A Combination Lens That Can Freely Convert the Shapes and Sizes of Light Spot Based on LED Light Source
    TUN Yu, JIA Lei, DONG Wen-Juan, LV Liu, DING Gui-Lin
    . 2018, 31(3):  65. 
    Abstract ( 431 )   PDF (621KB) ( 241 )  
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    Based on non-imaging optical theories,we proposed an optical system consist by combination of  two lens according to the characteristic of LED light source.This combination lens can freely convert the shapes and sizes of light spot.From the basic lens structure,we established different structure lenses with micro-array and surface stripe using SolidWorks.And then use the optical software LightTools simulation of light path,we can obtain a rectangular spot to a elliptical spot to a circular spot by changing the distance between the two lenses,and also can get different sizes of the spot.The divergence angle varies from 20° to 50°,the whole optical system luminous efficiency can be maintained at 93% or more.

    A Research on Smooth Switching Between Island and Grid-connected Operation Mode Based on Micogrid with Photovoltaic Generations
    XU Feng-Kun, CHAN Xiao-Chen
    . 2018, 31(3):  67. 
    Abstract ( 280 )   PDF (988KB) ( 232 )  
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    Based on the microgrid system with photovoltaic(PV) generations, the smooth switching between the isolated island and the grid-connected operation mode is considered by this paper. Combined with the improved pre-synchronization controller, a smooth and synchronous tracking switching control method based on the initial output situation of the PQ controller determining the output situation of the V/f controller is established. The performances of the voltage-current double loop controller under given parameters are analyzed and calculated, which show that the method proposed is effective and the switching process is steady and rapid, satisfying the requirements of the smooth switching.

    Research and Practice of "Three Help" Management System Based on ASP.NET Technology
    LEI Yi, MO Lian-Cheng, YANG Jing
    . 2018, 31(3):  72. 
    Abstract ( 283 )   PDF (441KB) ( 161 )  
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    According to the state of the continuous improvement of education management mode of graduate students, the graduate three help to master each policy to benefit students, the graduate "three help" management model has not been able to master.Put forward research and practice of "three help" management system based on ASP.NET technology. This method is based on the application development of Web Microsoft ASP.NET, using the.NET framework technology and public library, using the B/S design pattern, the management system is divided into the presentation layer,business layer and data layer, finally realize the information interaction between the presentation layer, business layer and data layer, the practice of graduate students completed "three help" management system. The design of the management system greatly overcome the traditional graduate "three help" closed system, data update is slow, the graduate management system data processing more efficient.

    Handwritten Chinese Character Recognition  Algorithm Based on Compressed Sensing
    ZHENG Hao-Chen, JIANG Wei
    . 2018, 31(3):  75. 
    Abstract ( 395 )   PDF (872KB) ( 219 )  
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    In view of the low recognition rate and recognition accuracy of handwritten Chinese character in marking system, a handwritten Chinese character recognition algorithm based on compressed sensing theory was proposed. The algorithm first randomly sampled the handwritten Chinese character in the marking system, and got its features. Then, it made sparse representation and minimized its l1 norm to get the sparse solution of the sample. Finally, the obtained sparse coefficient was used to identify the categories of the test samples. This method replaced the traditional method of feature extraction with random sampling of signals, which simplified the realization process of the algorithm. At the same time, with the usage of  training dictionary formed by the existing training samples, the complicated training process was avoided. Study results showed that the recognition rate of the algorithm in handwritten Chinese character database ETL9B reached 99.1%.

    Design of Spectrum Resource Management and Control System Based on Big Data Analysis
    LAN Tu
    . 2018, 31(3):  78. 
    Abstract ( 417 )   PDF (686KB) ( 218 )  
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    In view of the lack of spectrum resources, the deterioration of the electromagnetic environment, the uneven distribution and the high degree of correlation in space, time and frequency domain, a spectrum resource management and control system based on big data analysis is proposed. The system consists of spectrum monitoring and storage, data analysis and management and control center composed of three functional modules. Firstly, the distributed data acquisition framework is used to collect spectrum information and GPS information. Then, the use of big data analysis technology to predict the next time the use of spectrum resources to detect available channels to improve the efficiency of spectrum monitoring and optimize the spectrum monitoring strategy; finally, use the control center to manage spectrum usage rights of different levels of users. The simulation results show that the system can effectively deal with the massive spectrum data and improve the utilization of spectrum resources.

    Study on The Law of The Attenuation of Electromagnetic Signal Propagation
    in Sandstorm Weather
    LIU Yang, LI Kai, TAN Kang-Ba
    . 2018, 31(3):  81. 
    Abstract ( 370 )   PDF (590KB) ( 180 )  
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    Sandstorm weather has a great influence on peoples life, one of which is the interference of electromagnetic signal transmission, this article will establish the basic terrain model, and the Sandstorm weather simulation modeling processing, add to the basic terrain model, and then study its electromagnetic characteristics parameters to get a simulation model, At last, the propagation attenuation of electromagnetic wave in the absence of sand and the attenuation of electromagnetic wave propagation in different severity are compared by simulation. The attenuation diagram can be used to provide reference for considering the attenuation of the electromagnetic signal in the sandstorm area, and can be used to reverse the severity of the sandstorm weather.

    Research on Millimeter-wave 300 W Pulse Power Amplifier
    TUN Xiao-Shuai
    . 2018, 31(3):  84. 
    Abstract ( 394 )   PDF (623KB) ( 240 )  
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    In this paper, the transition of micro-strip waveguide, one point eight and one point three waveguide power network introduced. Using the domestic 15 W GaN power single chip, the 8 channel waveguide power synthesis is first designed, and then the 3 channel waveguide power synthesis is made. Finally, the 24 channel synthesis is composed. In the millimeter wave band 2 GHz bandwidth, the overall 24 channel waveguide power combing network synthesis loss is less than 0.8dB, and the synthesis efficiency reaches 83%. The solves the problem that the efficiency of traditional synthesis circuit decreases with the increase of synthetic network series, and meets the requirements of high efficiency and high power.

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