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4th International Conference on Mechanical, Electric and Industrial Engineering, MEIE 2021

作者： Cao, Ronggang Hu, Xueyi Dong, Erwa Ma, Xiao Zhou, Yu Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

In order to evaluate the electromagnetic launch effectiveness and understand the corrosion damage of the electromagnetic launcher, it is necessary to master the magnetic field data in the bore. At present, there is no related research on the measurement of the bore magnetic field of the electromagnetic launcher. Therefore, a small-scale projectile-borne measuring apparatus based on B-dot probe is developed in this paper. This apparatus uses FPGA as the core. Through the static magnetic field measurement experiment, the data of the induced voltage and the induced magnetic field can be obtained. The projectile-borne magnetic field measuring apparatus designed in this paper can accurately measure the bore magnetic field of the electromagnetic launcher, which lays the foundation for further analysis of the influence of the electromagnetic field in the bore on the launch effect and investigation of the corrosion damage of the electromagnetic launcher. © Published under licence by IOP Publishing Ltd.

关键词： Projectiles

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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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Structural and optical characteristics of InAs0.02Sb0.82N0.16thick epilayers grown by melt epitaxy

Structural and optical characteristics of InAs0.02Sb0.82N0.1...

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2023 Advanced Fiber Laser Conference, AFL 2023

作者： Gao, Yuzhu Chen, Zun Tian Hayakawa, Yasuhiro College of Electronics and Information Engineering Tongji University Shanghai201804 China Science and Technology on Electromechanical Dynamic Control Laboratory Xian710061 China Research Institute of Electronics Shizuoka University Johoku 3-5-1 Hamamatsu432-8011 Japan

ISBN: (纸本)9781510677661

InAs0.02Sb0.82N0.16 thick epilayers have been grown on InAs substrates by melt epitaxy (ME) technology. Fourier transform infrared (FTIR) transmission spectra showed that the cutoff wavelength of InAs0.02Sb0.82N0.16 samples grown by ME is 10.0 μm indicating the band gap narrowing. The thickness of the epilayers grown by ME observed by scanning electron microscopy (SEM) reaches 183 μm. X-ray diffraction (XRD) measurements confirmed that the epilayers are single crystals. The full-width at half-maximum (FWHM) of InAs0.02Sb0.82N0.16 (400) CuKα1 diffraction peak is 298.8 arcsec. The high quality of the crystals benefits from the thickness of the epilayers exceeding 100 μm, which significantly suppresses the effect of the lattice mismatch between InAs0.02Sb0.82N0.16 epilayers and InAs substrates. Energy dispersive spectrometer (EDS) attached SEM measurements revealed that 16% nitrogen has been incorporated in the epilayers. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： III-V semiconductors

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A Symmetry Treatment in Cylindrical Explicit and Unconditionally Stable FDTD Method

A Symmetry Treatment in Cylindrical Explicit and Uncondition...

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

作者： Sihan Zhao Bing Wei Yuanfei Hui Tie Li Gang Li Tiantian Feng 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

A symmetry treatment in cylindrical explicit and unconditionally stable FDTD (CEUS-FDTD) method is given. The system matrix of CEUS-FDTD method is unsymmetric, which will render instability since the explicit central–difference scheme is used for temporal discretization. By splitting the grid matrix reasonably and modifying the corresponding coefficients, the system matrix is transformed into a new symmetric matrix compulsively. Then an additional diagonal matrix will be obtained naturally on the other side of the equation to ensure that the time marching equation still holds. At last, unstable modes could be obtained by solving generalized eigenvalue problem of the new symmetric system matrix with respect to the diagonal matrix. Numerical results illustrates that the stability of CEUS-FDTD could be ensured and the accuracy would not be affected.

关键词： Symmetric matrices Accuracy Antenna theory Power system stability Eigenvalues and eigenfunctions Time-domain analysis Numerical stability Finite difference methods

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Design, Optimization and Performance Analysis of Permanent Magnet Synchronous Generator for Fuze

Design, Optimization and Performance Analysis of Permanent M...

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2023 IEEE International Conference on control, Electronics and Computer technology, ICCECT 2023

作者： Guo, Zhaoxuan He, Guanglin Ma, Guangsong Zhang, Yulong Qiao, Zenghui Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory Beijing China Xi'An Institute of Electromechanical Information Technology Xi'an China Beijing Electro-Mechanical Engineering Institution Beijing China PLA Strategic Support Force Tianjin China

ISBN: (纸本)9798350399028

In order to solve the power supply problem of the fuze on the small-caliber projectile and improve the reliability of the fuze power supply, a miniaturized fuze turbine permanent magnet synchronous generator (PMSG) is designed in this paper, which is a physical power supply driven by wind. In order to improve the electromagnetic performance of the design schemes, this paper proposes a methodology based on dimensional parameters optimization, optimizes the design parameters based on the Rotational Motor Expert (RMxprt) module, and then conducts electromagnetic performance analysis based on the Maxwell 2D module. Finally, according to the performance parameters, the scheme with 6-pole 9-slot mode is selected among the two schemes with different pole-to-slot ratio, its load line voltage is 21.53 V, and the rated load output power is 47.15 W, which meets the design requirements. © 2023 IEEE.

关键词： Permanent magnets

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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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Application of Ulaby Model in Simulation of Altimeter Fuze 13

Application of Ulaby Model in Simulation of Altimeter Fuze

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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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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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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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