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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Cheng Wang Wei Chen Rui-Hu Wen Science and Technology on Electromechanical Dynamic Control Laboratory China Xi'an Electromechanical Information Technology Research Institute

ISBN: (纸本)9781665418133

In order to solve the problem that the RF front end of autodyne radio fuze is weak in resisting high-power and energy-based jamming, a design method of electromagnetic protection circuit for RF front end is proposed. The method is to add an electromagnetic protection circuit composed of microwave limiter, RF band-pass filter, and single pole double throw switch, which between RF front-end circuit and transceiver antenna of the autodyne radio fuze. The electromagnetic protection of RF front-end core high-frequency devices is carried out by means of excess energy attenuation, selection of passing frequency, and transmission channel locking. Experimental verification shows that the electromagnetic protection circuit can protect the RF front end of the Autodyne radio fuze in both the frequency domain and the time domain, and improve the survivability of the fuze in the high EM environment.

关键词： Radio frequency Microwave antennas Design methodology Microwave theory and techniques Microwave circuits Transceivers Electromagnetics

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V-band antipolar fin line microstrip waveguide conversion structure

V-band antipolar fin line microstrip waveguide conversion st...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Wei Chen Rui-Hu Wen Xiao-Yan Zheng Shui-Ying Liu Lan-Jie Niu Science and Technology on Electromechanical Dynamic Control Laboratory Xi'anChina710065

ISBN: (纸本)9781665418133

The V-band microstrip waveguide conversion structure cannot meet the requirements of simple installation and integrated design. The fin line structure with specific size and shape is etched on the surface of the film. By adjusting the parameters of the opposite pole fin line, the conversion structure can meet the requirements of practical performance. The test results show that the center frequency of antipolar fin line microstrip waveguide conversion structure is 71.6GHz, the internal reflection parameter S11 is less than -20dB in the bandwidth of 67.3-77.0GHz and 10GHz, and the conversion structure size is 6.56mm*1.47mm*0.127mm. The conversion structure is installed in the middle of the V-band waveguide along the E-plane of the waveguide, without slotting the waveguide wall, which meets the requirements of superior performance, simple installation and integrated design.

关键词： Surface waves Shape Waveguide theory Microstrip antennas Integrated design Frequency conversion Reflection

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MARS ENTRY TRAJECTORY TRACKING COMPOUD control BASED ON NONSINGULAR FAST TERMINAL SLIDING MODE AND RBF NEURAL NETWORK 9

MARS ENTRY TRAJECTORY TRACKING COMPOUD CONTROL BASED ON NONS...

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9th International Symposium on Test Automation and Instrumentation, ISTAI 2022

作者： Dai, Juan Zhu, Shengtao Fan, Cunli Li, Jianfeng University of Beijing Information Science & Technology Beijing Key Laboratory of High Dynamic Navigation Technology Beijing100192 China Key Laboratory of Modern Measurement & Control Technology Ministry of Education Beijing100192 China School of Automation Beijing Information Science & Technology University Beijing100192 China

ISBN: (纸本)9781839538391

To realize the exact location of the Mars probe's entry trajectory, a glide mode control method based on the radial base function (RBF) neural network and non-lingual high-speed terminal is proposed. A model of the Mars probe's atmospheric entry section has been created, and the high-speed non-digital final slip controller is designed to approach track tracking error in a limited time and accelerate the approach speed. Neural networks are used to estimate and correct for complete system interruptions, and the stability of the system has been proven according to Lyapunov's theory of stability. The results of the Mars landing simulation show that the proposed control method can quickly approach unknown uncertain alarms, effectively monitor the landing trajectory of the probe to reach the parachute opening point with high precision, and improve the landing stability of the catheter. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Probes

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Near-field Echo Signal Model of Ground Background Based on Scattering Distribution Function

Near-field Echo Signal Model of Ground Background Based on S...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Bo Tian Tie Li Wenhui Hu Sicheng Gao Science and Technology on Electromechanical Dynamic Control Laboratory Xi'anShaanxiChina710061

ISBN: (纸本)9781665418133

Aiming at the problem that the traditional millimeter wave proximity detector model using backscattering coefficients has a large height setting error when the background echo signal quality is poor and the signal-noise ratio is insufficient, a near-field millimeter wave echo signal model based on scattering distribution function for complex feature background is proposed. The model is optimized as an upper half-space scattering distribution function based on the characteristics of feature types to study the near-field scattering functions of soil, vegetation and other backgrounds, and the scattering signals of each microscattering unit in the irradiated area of the detector beam at different moments are calculated in real time by combining with the missile target encounter model, and the echoes received at the detector are obtained in real time after integration. The simulation results show that compared with the traditional method, the model can meet the requirements of detection simulation with higher accuracy of background echo calculation under the condition of lower signal-noise ratio.

关键词： Simulation Millimeter wave technology Scattering Detectors Vegetation Soil Feature extraction

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Research on Intelligent Credibility Evaluation Method of Aircraft HWIL Simulation System Based on Complex Network 17th

Research on Intelligent Credibility Evaluation Method of Air...

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17th Chinese Intelligent Systems Conference, CISC 2021

作者： Huapin, Geng Ni, Li Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China Beijing Electromechanical Engineering Institute Beijing China Beijing University of Aeronautics and Astronautics Beijing China

ISBN: (纸本)9789811663192

Simulation credibility is an effective means to measure the effectiveness and correctness of simulation, and it is the cornerstone of simulation. According to the uncertainty of physical effect model and the complex interaction of model information in aircraft HWIL simulation system, The idea of time-varying directed weighted network and uncertainty measurement is introduced into the process of credibility evaluation of simulation system based on complex network and credibility evaluation theory;the credibility evaluation model of time-varying topological structure based on uncertainty measurement of model information interaction is established to quantitatively evaluate the credibility of simulation system. Taking a typical HWIL simulation system as an example, the effectiveness of the credibility evaluation method of simulation system based on complex network is fully tested. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Hardware-in-the-loop simulation

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Feature Extraction and Recognition of Typical Targets by Linear Array LiDAR

Feature Extraction and Recognition of Typical Targets by Lin...

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Intelligent Computing and Human-Computer Interaction (ICHCI), International Conference on

作者： Jian Huo Xu Yang Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

ISBN: (纸本)9781665407656

Aiming at solving the problem that the precision of existing algorithms for sparse point cloud image is unsatisfactory, a target recognition algorithm based on the combination of target shape characteristics and LiDAR echo intensity is proposed. By analyzing and processing the linear array scanning data of the target, remove the ground point cloud by using the point cloud elevation information histogram and the adaptive threshold method of the number of point clouds. On this basis, the mathematical morphology algorithm is used to filter the typical nontarget objects. Finally, the algorithm combining the target shape characteristics and echo intensity is used to realize the accurate recognition of the target. The results show that the algorithm is efficient and easy to implement, and has a good recognition effect on sparse point cloud targets.

关键词： Point cloud compression Human computer interaction Histograms Laser radar Target recognition Shape Morphology

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External blast load factors for dome structures based on reliability

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Defence technology（防务技术） 2022年第2期18卷 170-182页

作者： Shao-bo Qi Guang-yan Huang Xu-dong Zhi Feng Fan Richard GJFlay State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081PR China Key Lab of Structure Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of TechnologyHarbin150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin150090China Department of Mechanical Engineering University of AucklandPrivate Bag 92019Auckland1142New Zealand

Dome structures have been used extensively for industrial,residential,and military ***,it is necessary to understand the damage risk potential for such structures for blast-resistant design *** paper investigates the effect of blast load variability on the design value and the structural dynamic ***,the sources of uncertainty in the external blast load on dome structures were discussed *** based on the probabilistic blast load model for the dome,the rationality of a deterministic mass-increase safety method was *** was found that previous deterministic design method cannot provide a consistent and sound assurance factor or reliability index on the entire dome *** addition,it was also proved that the assurance-based load method fails to ensure compliance with structural safety design standards on the dome roof when compared with the reliability-based blast method.A sensitivity analysis on the probabilistic blast load was conducted,and the results indicate that stand-off distance and explosive mass both act as dominant sources to influence the mean and variability of blast ***,based on the Latin hypercube sampling method,a reliability-based external blast load factor technique was *** technique was further used to estimate structural damage levels of a single-layer reticulated dome under different reliability requirements,associated with a low,medium,and high level of protection grades for a specific explosion scenario,and it indicated that this technique can be useful in the building design to achieve a higher structural anti-explosion *** study herein can serve as a reference for the calculation method of designed blast load.

关键词： Dome structure Airblast variability Deterministic design Assurance factor Reliability-based blast load factor Structural damage levels

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Near-Field High-Speed Target InISAR Imaging Based on Wavenumber Domain Interpolation

Near-Field High-Speed Target InISAR Imaging Based on Wavenum...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Yijiang Chen Guohua Wei Yuzhao Li Xu Wang Jichi Chen School of Information and Electronics Beijing Institute of Technology Beijing China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Remote Sensing Equipment Beijing China

In this paper, a near-field high-speed target InISAR imaging method based on wavenumber domain interpolation is proposed. The focusing of the ISAR image is accomplished by performing Stolt interpolation on the echo signal in the wavenumber domain. Three-dimensional imaging is achieved by interferometric imaging algorithms. The algorithm simulation is carried out using the scattering point model generated by the electromagnetic simulation software, and the validity and stability of the algorithm are verified.

关键词： Interpolation Solid modeling Three-dimensional displays Simulation Software algorithms Electromagnetic scattering Focusing

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Temperature and strain sensitivities of surface and hybrid acoustic wave Brillouin scattering in optical microfibers

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Chinese Physics B 2022年第9期31卷 333-339页

作者： Yi Liu Yuanqi Gu Yu Ning Pengfei Chen Yao Yao Yajun You Wenjun He Xiujian Chou Taiyuan University of Technology Key Laboratory of Advanced Transducers and Intelligent Control SystemMinistry of Education and Shanxi ProvinceTaiyuan 030024China Taiyuan University of Technology Institute of Optoelectronic EngineeringCollege of Physics and OptoelectronicsTaiyuan 030024China Strong Digital Technology Co. Ltd.(Thinvent)Nanchang 410000China North University of China Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of EducationTaiyuan 030051China North University of China College of Mechatronics EngineeringTaiyuan 030051China North University of China Science and Technology on Electronic Test and Measurement LaboratorySchool of Instrument and ElectronicsTaiyuan 030051China

Temperature and strain sensitivities of surface acoustic wave(SAW)and hybrid acoustic wave(HAW)Brillouin scat-tering(BS)in 1μm-1.3μm diameter optical microfibers are *** contrast to stimulated Brillouin scattering(SBS)from bulk acoustic wave in standard optical fiber,SAW and HAW BS,due to SAWs and HAWs induced by the coupling of longitudinal and shear waves and propagating along the surface and core of microfiber respectively,facilitate innovative detection in optical microfibers *** highest temperature and strain sensitivities of the hybrid acoustic modes(HAMs)are 1.082 MHz/℃and 0.0289 MHz/με,respectively,which is suitable for microfiber sensing applica-tion of high temperature and strain ***,the temperature and strain sensitivities of the SAMs are less affected by fiber diameter changes,ranging from 0.05 MHz/℃/μm to 0.25 MHz/℃/μm and 1×10^(-4) MHz/με/μm to 5×10^(-4) MHz/με/μm,*** can be found that that SAW BS for temperature and strain sensing would put less stress on manufacturing constraints for optical ***,the simultaneous sensing of temperature and strain can be realized by SAW and HAW BS,with temperature and strain errors as low as 0.30℃-0.34℃and 14.47με-16.25με.

关键词： Brllouin scatering surface acoustic waves hybrid acoustic waves optical microfiber sensing

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Numerical simulation of an internal reforming solid oxide fuel cell unit fueled with hydrogen-natural gas mixtures 17

Numerical simulation of an internal reforming solid oxide fu...

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17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021

作者： Fan, J. Wang, Y. Shi, J. Shi, Y. Cao, H. Cai, N. Department of Energy and Power Engineering Tsinghua University Beijing100084 China National Key Laboratory on Electromechanical Dynamic Control Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781607685395

Blending hydrogen into natural gas grid can effectively reduce carbon emissions and promote the development of the hydrogen economy. Utilizing hydrogen-natural gas mixtures through internal reforming solid oxide fuel cells (SOFCs) can convert the chemical energy of the fuels direct into electricity, which is a promising technology for combined heat and power systems. In this study, a three-dimensional model for an internal reforming solid oxide fuel cell unit is developed coupling chemical and electrochemical reactions, mass, momentum and heat transfer processes. The influences of the hydrogen addition on the distributions of temperature, gas compositions, and current density are studied by changing the hydrogen blending ratios in inlet gas mixtures. The simulation results show that the addition of hydrogen affects the coupling of the endothermic reforming reactions and exothermic electrochemical reactions, which leads to improved temperature uniformity and higher current density of the SOFC unit compared with pure methane feeding. © 2021 Electrochemical Society Inc.. All rights reserved.

关键词： Gas emissions

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