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

作者： Gao, Sicheng Li, Tie Li, Wei Tian, Bo Science and Technology on Electromechanical Dynamic Control Laboratory Shaanxi Xi'an710061 China

ISBN: (纸本)9781665418126

In order to solve the problem that the application mechanism of scattering information of background of surface features in the design process of altimeter fuze is not clear, a simulation method of altimeter fuze based on Ulaby model is proposed. This method is based on the Ulaby model to model the target characteristics of background of surface features. The target characteristics information is used as the input information of fuze detection in the missile target encounter process, adopting the digital signal processing method. The response characteristic model of fuze target detection is established, and the response simulation of fuze detection to the time-varying scattering characteristics of background of surface features in the process of missile target encounter is carried out, and the response characteristics of echo and IF signal processing are clearly reproduced. The experimental results show that Ulaby model can be used to distinguish different background of surface features types. The target type information is added as another dimensional fuze detection information, and the detection accuracy is further improved by combining the height information. © 2021 IEEE.

关键词： Digital signal processing

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Near-field Echo Signal Model of Ground Background Based on Scattering Distribution Function 13

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

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

作者： Tian, Bo Li, Tie Hu, Wenhui Gao, Sicheng Science and Technology on Electromechanical Dynamic Control Laboratory Shaanxi Xi'an710061 China

ISBN: (纸本)9781665418126

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. © 2021 IEEE.

关键词： Distribution functions

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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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Feature Extraction and Recognition of Typical Targets by Linear Array LiDAR 2

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

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2nd International Conference on Intelligent Computing and Human-Computer Interaction, ICHCI 2021

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

ISBN: (纸本)9781665407649

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. © 2021 IEEE.

关键词： Optical radar

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Strong Electromagnetic Protection Circuit for RF Front End of Autodyne Radio Fuze 13

Strong Electromagnetic Protection Circuit for RF Front End o...

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

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

ISBN: (纸本)9781665418126

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. © 2021 IEEE.

关键词： Microwave limiters

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Refined modeling and experimental verification of a torque motor for an electro-hydraulic servo valve

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Chinese Journal of Aeronautics 2023年第6期36卷 302-317页

作者： Zhichuang CHEN Shenghong GE Yulei JIANG Wenhao CHENG Yuchuan ZHU National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft SystemsNanjing 210061China AVIC Nanjing Servo Control System Co. LtdNanjing 210032China

The Permanent Magnet Torque Motor(PMTM)is the key electro-mechanical conversion device in an Electro-Hydraulic Servo Valve(EHSV).In this work,a refined model of a PMTM is developed,considering the non-working air-gaps between the upper or lower yoke and the armature,the fringing effect at the limiting holes,and the nonlinear permeability of soft magnetic *** on the refined model,the influences of various factors on the calculation accuracy of the magnetic flux at the pole surfaces of the armature and the output torque are *** verifying the validity of the refined model,a Finite Element Analysis(FEA)of the PMTM is conducted,and a test platform is *** with existing models,the refined model can better reveal the intrinsic mechanism of the PMTM,and its calculations are more consistent with the FEA *** experimental results of the armature deflection displacement show that the refined model can accurately describe the output characteristics of the PMTM.

关键词： Calculation accuracy Electro-hydraulic servo valve Experimental verification Finite element analysis Refined model Torque motor

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Assault Rifle Detection and Identification Based on Convolutional Neural Network YOLOv3 3

Assault Rifle Detection and Identification Based on Convolut...

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3rd World Symposium on Artificial Intelligence, WSAI 2021

作者： Ma, Yunfei Chen, Huimin Huo, Jian Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory Beijing China

ISBN: (纸本)9780738143033

In modern war, armies from different countries have different weapons for infantry. Therefore, identifying the weapons held by infantry helps to determine their affiliations. In this paper, we have built our dataset of different types of assault rifles from photos. The dataset was trained using the convolutional neural network YOLOv3. Several different real videos were used to verify the YOLOv3 training results. The experiments show that the model can detect and identify assault rifles in different scenes. It proves to work with a good accuracy and can be used in real time on battlefield. © 2021 IEEE.

关键词： Object detection

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Design, Modeling and Motion Simulation of a Setback Arming Mechanism under Weak Acting Forces 4

Design, Modeling and Motion Simulation of a Setback Arming M...

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2021 4th International Conference on Modeling, Simulation and Optimization Technologies and Applications, MSOTA 2021

作者： Lv, Bing Wang, Dongya Zhang, Zhenze Sui, Li Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China Northwest Industries Group Co. Ltd Xi'an710043 China

A parallel two-degree-of-freedom (two-DOF) setback arming mechanism was designed in this study according to acceleration signal characteristics of weak launch and service conditions. A model of an inertia switch with a low g-feature was designed to be used in the electromechanical fuze of the proposed mechanism. Simulations were conducted to analyze the motion characteristics of the inertia switch that was based on the parallel two-DOF spring-mass system under the launch overload and the service dropping overload. The reliability and safety of the inertia switch were validated. © Published under licence by IOP Publishing Ltd.

关键词： Degrees of freedom (mechanics)

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Monte Carlo-based simulation study on the firing performance of mortar projectiles trigger mechanism

Monte Carlo-based simulation study on the firing performance...

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2022 International Symposium on Robotics, Artificial Intelligence, and Information Engineering, RAIIE 2022

作者： Shi, Mengjie Song, Rongchang Cui, Haibin Li, Hongshe He, Guanglin Du, Yanan Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China Huaihai Industry Group Co. Ltd. Shanxi Changzhi China

ISBN: (纸本)9781510660137

The mortar projectiles often land on the back of the hillside when fighting in mountainous areas. The projectile hits the target with a small landing angle, and there will be a phenomenon of rubbing the ground, resulting in a low hit rate. In this paper, a multi-rigid-body dynamics virtual prototype model is established for different targets struck by a different falling angle of the mortar projectile, the displacement and velocity data of the firing-pin and detonator as well as the incomplete firing results are obtained through simulation, the firing probability is evaluated by applying the Monte Carlo method, the contribution of the variables affecting the target value is obtained by applying the design of experiment(DOE), and the relevant parameters are optimized to realize fully fire when the parameters are in their new value range. © 2022 SPIE.

关键词： Mortar

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Granular Flow in Microfluidic Chips Under Centrifugal Conditions: Dem Simulations and Experiments

SSRN

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SSRN 2025年

作者： Liu, Yang Xie, Yushan Wang, Yabin Cen, Mingxiang Wang, Yongqiang Guo, Jialong Chen, Zhengguang School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing100081 China

With increasing emphasis on granular flow mechanisms and precise flow control, studying the behavior of powder particles in micro-hoppers using microfluidic chips extends research scope to the mesoscopic scale. This approach enhances our understanding of local particle behavior through high-speed imaging and flexible geometry design. In this work, we employed discrete element method (DEM) simulations and experiments to investigate granular flow within microfluidic chips, applying centrifugal force to deliver continuous and adjustable driving forces. We mainly explored two micro-hopper geometries filled with zirconium oxide (ZrO2) spherical micro-particles: wedge-shaped and arc-shaped geometries. Effect of the micro-hopper height and the outlet width were investigated as well. Blockage could be observed for the 45° wedge-shaped micro-hopper (WSMH) when the outlet width [[EQUATION]] is less than 3.8 times the particle diameter ([[EQUATION]]). Comparative analysis demonstrates a 40-70% enhancement in mass discharge rate (MDR) for the arc-shaped micro-hopper (ASMH) over the WSMH, due to optimized stress redistribution. A scaling relation between the microchannel width (equivalent to the outlet width of the micro-hopper) and the MDR was established. Experimentally, we introduced a method for fabricating the micro-hopper, employing a high-speed rotating platform (3000 rpm) to drive micro-particle motion, while high-speed cameras enabled real-time flow observation. Experimental results of the interval MDR demonstrated considerable consistency with the simulation. The approach for studying granular flow in microfluidic chips under controlled driving forces offers a new paradigm for investigating both overall and local behaviors of powder particles, thereby advancing our understanding of particle interactions and collective dynamics. © 2025, The Authors. All rights reserved.

关键词： Microfluidic chips

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