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Bio-Inspired electromagnetic protection Based on Neural Information Processing

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Journal of Bionic Engineering 2014年第1期11卷 151-157页

作者： Xiaolong Chang Shanghe Liu Menghua Man Weihua Han Jie Chu Liang Yuan institute of electrostatic and electromagnetic protection Mechanical Engineering College Shijiazhuang 050003 P R. China institute of Semiconductors Chinese Academy of Science Beijing 100083 P. R. China Department of Information Engineering Mechanical Engineering College Shijiazhuang 050003 P. R. China

Electronic systems are vulnerable in electromagnetic interference environment. Although many solutions are adopted to solve this problem, for example shielding, filtering and grounding, noise is still introduced into the circuit inevitably. What impresses us is the biological nervous system with a vital property of robustness in noisy environment. Some mechanisms, such as neuron population coding, degeneracy and parallel distributed processing, are believed to partly explain how the nervous system counters the noise and component failure. This paper proposes a novel concept of bio-inspired electromagnetic protec- tion making reference to the characteristic of neural information processing. A bionic model is presented here to mimic neuron populations to transform the input signal into neural pulse signal. In the proposed model, neuron provides a dynamic feedback to the adjacent one according to the concept of synaptic plasticity. A simple neural circuitry is designed to verify the rationality of the bio-inspired model for electromagnetic protection. The experiment results display that bio-inspired electromagnetic pro- tection model has more power to counter the interference and component failure.

关键词： biological nervous system robustness population coding bio-inspired electromagnetic protection model neuralcircuitry

Research on 3D Braided Nickel Plated Carbon Fiber/epoxy Resin Composites and Their electromagnetic protection Properties

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高电压技术 2013年第8期39卷 2027-2030页

作者： QU Zhaoming WANG Qingguo LEI Yisan ZHANG Ruigang institute of electrostatic & electromagnetic protection Mechanical Engineering College Shijiazhuang 050003 China The 33rd institute of China Electronics Technology Group Corporation Taiyuan 030006 China

To develop electromagnetic protection composites with integrated structure -function properties, the three-dimension (3D) braided nickel plated carbon fiber/epoxy resin (Ni-CF3D/EP) composites were prepared based on 3D five-directional braiding, unitary nickel plating and mold compression shaping. The electromagnetic protection properties of Ni-CF3D/EP composites including shielding effective- ness (SE) and reflection loss against plane electromagnetic wave, shielding properties against electromagnetic pulse (EMP) were investigated. The test results show that the novel composites have good electromagnetic protection properties in a wide frequency range of 14 kHz～18 GHz with SE of 42 dB～95 dB, the absorption bandwidth of –5 dB in 2 GHz～18 GHz can reach 10 GHz and the pulse peak SE against EMP is 43.7 dB which can reduce the electromagnetic energy greatly. Meanwhile, the mechanic properties were also investi- gated and the results indicate that the Ni-CF3D/EP composites can replace metal materials for loading-bearing structural applications because of their excellent mechanic properties.

关键词：树脂基复合材料三维编织电磁防护防护性能环氧树脂碳纤维镀镍复合材料结构

Principles of electromagnetic protection bionics and research of fault self-recovery mechanism

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Engineering Sciences 2014年第3期12卷 83-96页

作者： Yuan Liang Man Menghua Chang Xiaolong Department of Information Engineering Ordnance Engineering College Shijiazhuang 050003 China institute of electrostatic and electromagnetic protection Ordnance Engineering College Shijiazhuang050003 China

As we have borrowed the wisdom from biological neural network, the characteristic of interference- proof in information transferring process has been carefully studied. Our study includes the response of electrical-interference-proof circuit in electromagnetic environment, by means of bionics redesign. In this way, new principles, new technics and new ways are adopted to solve the unavoidable situations in traditional electro- magnet protection design. Based on the Boolean model, the complex bionic topological networks were firstly built and the charactoristics of degeneracy were analyzed, then the bidirectional actions between degeneracy in networks and the robustness of functions were proved in order to fill up the gap to deal with the need of interference-proof. Based on the creation of the neuron networks and the electrical synapses ＇ charac- teristic of plasticity, the impact of the distribution in the weight of synapse on the character of network self- recovery was studied afterwards so that the corresponding mechanism could be defined.

关键词： bionics electromagnetic bionics electromagnetic protection degeneracy plasticity robustness

Mathematical method for air electrostatic discharge circuits calculation

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High Voltage 2018年第3期3卷 226-231页

作者： Liu Xinggang Wei Ming Hu Xiaofeng institute of electrostatic and electromagnetic protection Shijiazhuang Branch of Army Engineering UniversityShijiazhuangPeople's Republic of China

Here,a new analytical method,state matrix transform method,is proposed for calculating the descriptions of current waveforms generated by commercial electrostatic discharge(ESD)*** method can be used to analyse and design lumped parameter ESD circuits.A relatively simple eight elements ESD circuit model is established and used to predict the current waveform of human-metal ESD *** calibrate the ESD simulator,a mathematical expression of four exponentials curve for ESD current waveform is *** careful theoretical study of ESD current waveform calculation makes an innovative contribution to ESD generator circuit simulation and design,and it provides a new mathematical description for ESD sensitivity test.

关键词： electrostatic calculation Mathematical

含贯通导体腔体电磁耦合的混合计算模型（英文）

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高电压技术 2014年第9期40卷 2827-2832页

作者：李新峰魏光辉潘晓东李凯 institute of electrostatic and electromagnetic protection Mechanical Engineering College

For studying the coupling effect of electromagnetic irradiation to rectangular enclosure with wire penetration,a new hybrid model is proposed to determine the shielding effectiveness of the *** model based on rectangular-enclosure equivalent circuit regards the penetrating wire as a monopole antenna,and the frequency-domain results of calculation using this model match with that of computer simulation technology(CST)Microwave ***,this new model requires far less computation than traditional methods:3 s for one sample on an average personal *** on the presented model,the relationships between enclosure volume,external length of wire penetration,internal length of wire penetration,and shielding effectiveness are *** the frequency range from 100 MHz to1 000 MHz,when keeping the length of penetrating wire unchanged,the shielding effectiveness of an enclosure at its center point increases with the cavity *** is no obvious effect from the external length of penetrating wire on the shielding *** the external length of a penetrating wire is 8 cm unchanged,the shielding effectiveness of the penetrated enclosure at its center point declines with the increase of internal length of the penetrating wire.

关键词：含贯通导体电磁耦合混合计算计算模型

Experimental Research of electromagnetic Field Coupling to Irregular Metal Cavity with Square Aperture

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高电压技术 2013年第10期39卷 2415-2421页

作者： LI Xinfeng WEI Guanghui PAN Xiaodong LI Kai institute of electrostatic and electromagnetic protection Mechanical Engineering College Shijiazhuang 050003 China

In order to study electromagnetic field coupling to irregular cuboid enclosures, tests of shielding effectiveness are performed using a hollow irregular truncated pyramid with a square aperture. The electric field distribution inside the enclosure with different sizes of the square aperture is measured within the frequency range of 5~1 000 MHz. The experimental results are in a good agreement with the stimulation results obtained by using computer simulation technology (CST) code. It is shown that the aperture size affects shielding effectiveness at low frequencies, at which shielding effectiveness decreases with the decreasing aperture size. The effect of the aperture size vanishes and shielding effectiveness improves by more than 12 dB when polyurethane absorbent fills the enclosure.

关键词：磁场耦合金属腔体实验计算机仿真技术方孔屏蔽效能屏蔽效果孔径大小

Modeling of Material Shielding Effectiveness Against electromagnetic Pulse in Time-domain

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高电压技术 2013年第10期39卷 2358-2364页

作者： WEI Ming CUI Ming CHEN Xiang institute of electrostatic & electromagnetic protection Mechanical Engineering College Shijiazhuang 050003 China

To characterize the shielding effectiveness(SE) of materials against electromagnetic pulse(EMP) that cannot be adequately evaluated by traditional test methods,a transfer function model of SE is *** homemade broadband coaxial fixture,the SE of a metal fabric material against square-pulse and electrostatic discharge(ESD) EMP is tested in the time *** peak SE calculated from the test results matches well with that obtained *** on the system identification theory,we propose the transfer function model of SE,which takes the square pulse and human body model ESD EMP data obtained in the tests as training data and takes the machine model as verification data,as well as a second-order expression of the transfer *** the transfer function model,the waveforms of the shield-penetrated square-pulse EMP and the ESD EMP are actually *** the perspective of system identification,this accurate prediction of the shielded waveform of EMP provides a reliable way for evaluating SE of materials against EMP.

关键词：电磁脉冲屏蔽效能时域建模材料传递函数模型系统辨识理论测试方法静电放电

Use of Double Differential-mode Current Injection Method Equivalent to High Level Illumination for Susceptibility Testing

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高电压技术 2013年第10期39卷 2431-2437页

作者： LU Xinfu WEI Guanghui PAN Xiaodong institute of electrostatic and electromagnetic protection Mechanical Engineering College Shijiazhuang 050003 China

To achieve the electric field strength and the induced currents in equivalence in susceptibility tests with the high-level field radiation above 400 MHz,a double differential-mode(DM) current injection method based on directional couplers is *** cascaded symmetrical directional couplers compose a coupling device to inject the DM *** the coupling device is used,two devices are necessary to achieve the equivalence between radiation and injection,*** equivalence between the injected voltages and the field strength,which is linear,regardless of the characteristics of the equipment under test(EUT).The results are verified by experiments using typical coaxial cables and nonlinear devices,where the equivalence between the nonlinear EUT responses induced by radiation and injection at both ends is achieved by using two coupling *** a frequency up to 1.75 GHz,the maximal experimental error is only 3.39%.The experimental results confirm the accuracy of the proposed method even both the EUTs work in the nonlinear *** proposed method is applicable for radiated susceptibility(RS) testing of interconnected systems in the microwave frequency band.

关键词：电流注入法药敏试验差模定向耦合器非线性器件照明实验误差电场强度

Investigation on Frequency Stirring in Reverberation Chamber

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高电压技术 2014年第3期40卷 951-956页

作者： CHENG Erwei WANG Qingguo LIU Yifei XU Xin institute of electrostatic and electromagnetic protection Mechanical Engineering College Shijiazhuang 050003 China

The radio frequency (RF) modes of reverberation chamber (RC) in different frequency ranges are calculated to develop frequency-stirring techniques for RCs. An experimental system is built with a two-port vector network analyzer, of which one port is connected to a transmitting antenna located in a corner of a RC, and the other port is connected to a receiving antenna located in the working area of the RC. The parameter S21 is obtained in eight different locations of the receiving antenna for discussing the number of RF modes and the stirring bandwidth. It is found that the lowest useable frequency of a RC is determined by the RC's dimension: the larger the dimension is,the lower the lowest useable frequency is. S_(21) at the lowest useable frequency is about ?20 dB, and it is more stable than that at lower frequencies when the frequency increases. Increasing the bandwidth would result in a smoother dependence of S21 on frequency, which shows that frequency stirring is effective. In a RC with frequency stirring, the standard deviations of three individual field components and the total field are within the specified tolerance, i.e. the electric field distribution is uniform. Meanwhile, the electric field's magnitude is characterized by the Chi-distribution with two degrees of freedom or the Rayleigh distribution, and the square of the magnitude is characterized by the Chi-square distribution with two degrees of freedom or the exponential distribution. Therefore, both good uniformity and good behavior of the electric field can be obtained if the RF modes in the RC are sufficient.

关键词：高电压技术高压安全高压试验避雷设施