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Artificial Intelligence, Networking and Information technology (AINIT), International Seminar on

作者： Pengzhao Xu Guangsong Ma Sen Wang Shaokang Cui Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China Xi'an Institute of Electromechanical Information Technology Xi'an China

ISBN: (数字)9798350385557

ISBN: (纸本)9798350385564

Aiming at the problem of whether the connection strength of the thread of the penetration fuze is sufficient the operating requirements under the impact load of penetrating multi-layer target plate. Using theoretical calculation and numerical simulation methods, under three different excitation conditions (axial, axial + radial (0.3 times axial), axial + radial (0.6 times axial)) under the impact load of the multi-layer target plate, the shear strength of the thread connecting the screw and the fuze shell and the extrusion strength of the thread tooth surface were studied. The results show that the design margins under the three excitation conditions are 0.9, 0.6 and 0.1, respectively, and all have certain design margins, indicating that the connection thread of the fuze meets the strength requirements when subjected to the impact load of the penetrating multilayer target plate.

关键词： Seminars Simulation Loading Fasteners Numerical simulation Nonhomogeneous media Synchronization

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Research on a fuze anti-jamming strategy under the background of complex ground objects 13

Research on a fuze anti-jamming strategy under the backgroun...

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13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Xia, Lei Dai, Liang Zou, Jin-Long Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China

ISBN: (纸本)9781665418126

Aiming at the problem of the reduced reliability of the radio proximity fuze under the jamming of complex ground objects,a method of fixed height for laser and radio combined detection is proposed. Using the method of dual-beam separate airspace detection and information fusion,a mathematical model of the fuze's fixed height initiation is established. Through the analysis of the dynamic ground detection model and the ground objects jamming detection model, this design idea and mathematical model against the ground objects jamming effectiveness are confirmed. © 2021 IEEE.

关键词： Object detection

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V-band antipolar fin line microstrip waveguide conversion structure 13

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

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13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Chen, Wei Wen, Rui-Hu Zheng, Xiao-Yan Liu, Shui-Ying Niu, Lan-Jie Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China

ISBN: (纸本)9781665418126

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. © 2021 IEEE.

关键词： Fins (heat exchange)

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MAPPING-BASED DRIFT FAULT REPAIR METHOD FOR ARRAY INERTIAL DEVICES 9

MAPPING-BASED DRIFT FAULT REPAIR METHOD FOR ARRAY INERTIAL D...

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

作者： Chen, Hao Su, Zhong Xu, Zhan Li, Qing Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science & Technology University Beijing China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science & Technology University Beijing China

ISBN: (纸本)9781839538391

The array inertial device can significantly improve the positioning accuracy of the wearable autonomous positioning system, but it is difficult to avoid faults in the working process of the array inertial device, even if the fault is detected, the positioning system will fail. Aiming at the fault that the acceleration drift of array inertial device increases in the process of motion in the wearable autonomous positioning system of emergency rescue personnel, a fault repair method of acceleration array based on BP neural network was proposed. Through data fusion of accelerometer and gyroscope, a fault repair method based on mapping contrast elimination is implemented. The experimental results of twelve IMU array data fusion and fault repair show that the proposed method can be used to repair the typical faults with the increase of accelerometer drift in the array inertial device. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Repair

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Tunable Chirality and Helicity of Bessel Twisted Beams Near the Dirac Points in Topological Metacrystal

Tunable Chirality and Helicity of Bessel Twisted Beams Near ...

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

作者： Yuanfei Hui Zhiwei Cui Sihan Zhao Tie Li Gang Li Haijun He Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China School of Physics Xidian University Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In this work, we undertake an approach to describe the tunable optical chirality and helicity of twisted beam near the Dirac point in topological meta-crystals. An improved method based on the full vector wave analysis is introduced to investigate the chirality and helicity of Bessel twisted beams near the Dirac point in the interface of topological meta-crystals. It is showed that the giant non-specular effects of chirality and helicity are discovered when a Bessel twisted Beam reflects in the vicinity of a Dirac point, which is sensitive to the incident frequency, angle, and electromagnetic properties of the topological meta-crystal. We can attribute the giant non-specular effect of chirality and helicity to the degeneracy between critical angle and Brewster angle caused by the Dirac point. The results will be of significant interest of study the measurement of Dirac point, and inspire a perspective for manipulating twisted beams with Dirac point.

关键词： Analytical models Antenna theory Beams Vectors Metamaterials Optical sensors Optical reflection Electromagnetic fields Electromagnetics Photonics

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Dual-Band Flexible Terahertz Sensor Based on Rotated Metamaterial Structure

Dual-Band Flexible Terahertz Sensor Based on Rotated Metamat...

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2023 IEEE MTT-S International Wireless Symposium, IWS 2023

作者： Wang, Dongxu Xu, Kai-Da School of Information and Communications Engineering Xi'an Jiaotong University Xi'an China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China East China Normal University State Key Laboratory of Precision Spectroscopy Shanghai200241 China

ISBN: (纸本)9798350336535

In this article, a terahertz flexible metamaterial sensor with dual-band operating characteristics is introduced. The gold metamaterial array is arranged on the top surface of a polyimide film, while the structure is made up of a rotated structure with spiral-shaped strips. Two resonances occur at 0.37 and 1.13 THz with outstanding polarization insensitivity. The metamaterial sensor also has sensitive refractive index sensing properties, with sensitivities of 0.1 THz/RIU and 0.3 THz/RIU, respectively, at the two operating bands. This work shows potential applications in refractive index and nesticide sensing. © 2023 IEEE.

关键词： Metamaterials

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Deep Reinforcement Learning-Based Cooperative Guidance Law with Multi-Constraint

Deep Reinforcement Learning-Based Cooperative Guidance Law w...

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2023 China Automation Congress, CAC 2023

作者： Gao, Zhihao Fan, Junfang Dou, Denghui Ji, Yi Li, Yafeng Wu, Jinmin School of Automation Beijing Information Science and Technology University Beijing China Beijing Key Laboratory of High Dynamic Navigation Technology Beijing China School of Aerospace Engineering Beijing Institute of Technology Beijing China Beijing Key Laboratory of Uav Autonomous Control Beijing Institute of Technology Beijing China

ISBN: (纸本)9798350303759

To enhance the destructive capabilities of small air-to-surface missiles, it is necessary to address the challenges related to terminal attack angle constraints and multi-missile coordinated attacks, we propose a cooperative guidance law with multi-constraint based on deep reinforcement learning in this paper. Firstly, an intelligent control term is introduced into the biased proportional navigation law with angle constraints. Secondly, a reward function is designed to reduce terminal attack angle error and flight time error, ensuring that the missile successfully reaches the target within the expected flight time, while simultaneously converging the attack angle to the desired value. Finally, the deep deterministic policy gradient algorithm is employed for the purpose of training and generating intelligent guidance instructions. Simulation results substantiate the efficacy of the devised guidance method in achieving accurate target strikes, both for individual missiles and in scenarios involving multiple missiles. And exhibiting better stability and guidance accuracy compared to the traditional biased proportional navigation law. © 2023 IEEE.

关键词： Reinforcement learning

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Numerical study on ethylene-air continuous rotating detonation in annular combustors with different widths

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Journal of Zhejiang University-science A(Applied Physics & Engineering) 2022年第5期23卷 388-404页

作者： Wei-jie FAN Wei-dong LIU Hao-yang PENG Shi-jie LIU Jian SUN Science and Technology on Scramjet Laboratory College of Aerospace Science and TechnologyNational University of Defense TechnologyChangsha 410073China State Key Laboratory of Aerospace Dynamic Satellite Control CenterXi’an 710043China

To investigate the impact of combustor width on continuous rotating detonation(CRD)fueled by ethylene and air,a series of 3 D simulations are conducted by changing the inner cylinder radius of an annular combustor while retaining the same outer cylinder *** results show that the CRD wave propagates more steadily and faster as the combustor width *** high-temperature zone at the backward-facing step preheats the propellants and contributes to the steady propagation of the CRD wave in 25-and 30-mm wide *** highest and the lowest velocities are obtained in the30-and 15-mm wide combustors at,respectively,1880.27 and 1681.01 m/*** the other hand,the average thrust decreases as the combustor width *** highest thrust is obtained in the 15-mm wide combustor while the lowest is in the 30-mm wide combustor,at 758.06 and 525.93 N,***,the thrust is much more stable in the 25-and 30-mm wide combustors than in the 15-and 20-mm wide combustors.

关键词： Continuous rotating detonation(CRD) Ethylene-air Combustor width Propagation mode Propulsive performance

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A Research on Bank Card Number Recognition Based on ASFF+YOLOv7 and Multi-Scale Feature Line Fusion 13

A Research on Bank Card Number Recognition Based on ASFF+YOL...

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13th IEEE International Conference on CYBER technology in Automation, control, and Intelligent Systems, CYBER 2023

作者： Cheng, Jiajun Wu, Yaoyan Gao, Weitao Fu, Jun Northeastern University Faculty of Robot Science and Engineering Liaoning Shenyang China School of Electrical and Control Engineering State Key Laboratory of Dynamic Testing Technology North University of China Shanxi Taiyuan China

ISBN: (纸本)9798350315196

Electronic payments have become the primary mode of payment today, and bank card recognition is widely used in industries such as mobile, mobile banking, and third-party payments. To address issues such as low fault tolerance due to factors such as complex backgrounds, significant perspective distortion that is difficult to recover, and high illumination variation, we propose a Bank Card Number Recognition algorithm based on ASFF + YOLOv7 and Multi-Scale Feature Line Fusion. The algorithm comprises two parts: the front-end dataset generation stage introduces an efficient semi-automatic traditional bank card dataset generation algorithm, which reduces the manual annotation cost while ensuring relative accuracy and significantly improves work efficiency. In the back-end recognition stage, we have improved the traditional deep learning model for the long-tail digit string dataset, achieving a precision of 99.19% and a recall rate of 98.65%. © 2023 IEEE.

关键词： Fault tolerance

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A Deep Reinforcement Learning-Based Guidance Law with Impact Angle Constraint

A Deep Reinforcement Learning-Based Guidance Law with Impact...

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2023 China Automation Congress, CAC 2023

作者： Wang, Xu Fan, Junfang Dou, Denghui Ji, Yi Li, Yafeng Wu, Jinmin School of Automation Beijing Information Science and Technology University Beijing China Beijing Key Laboratory of High Dynamic Navigation Technology Beijing China School of Aerospace Engineering Beijing Institute of Technology Beijing China Beijing Key Laboratory of Uav Autonomous Control Beijing Institute of Technology Beijing China

ISBN: (纸本)9798350303759

Addressing the challenge of ineffective impact angle control when employing conventional biased proportional navigation guidance for precision-guided missiles against maneuvering targets, this study proposes a guidance law with impact angle constraint by integrating deep reinforcement learning algorithms with biased proportional navigation guidance. The algorithm enhances traditional proportional navigation guidance by introducing a target maneuver compensation bias term. This bias term is treated as an action in a learning framework and optimized using the Proximal Policy Optimization algorithm. Simulation experiments validate that the proposed algorithm, compared to conventional proportional navigation guidance, not only reduces miss distance and impact angle error but also shortens flight time. © 2023 IEEE.

关键词： Reinforcement learning

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