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检索条件"机构=Science and Technology on Electromechanical Dyamic Control Laboratory"

共 351 条记录，以下是191-200 订阅

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Application of Ulaby Model in Simulation of Altimeter Fuze

Application of Ulaby Model in Simulation of Altimeter Fuze

引用

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

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

ISBN: (纸本)9781665418133

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.

关键词： Missiles Antenna theory Scattering Object detection Digital signal processing Feature extraction Clutter

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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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Path Planning for Coverage Spraying of Plants in Outdoor Wheeled Mobile Robots

Path Planning for Coverage Spraying of Plants in Outdoor Whe...

引用

Robotics, control and Automation (ICRCA), International Conference on

作者： Weixin Zhang Zhengxin Yu Shixin Mao Xuefeng Zhou Jia Pan Haifei Zhu School of ElectRomechanical Engineering Guangdong University of Technology Guangzhou China Jiutian Innovation (Guangdong) Intelligent Technology Co Ltd Foshan China Guangdong Key Laboratory of Modern Control Technology Institute of Intelligent Manufacturing Guangdong Academy of Sciences Guangzhou China Department of Computer Science The University of Hong Kong Hong Kong China

ISBN: (数字)9798331544577

ISBN: (纸本)9798331544584

In contemporary agricultural practices and pest management, the deployment of outdoor wheeled mobile robots for precise and efficient plant spraying is crucial to optimize chemical application and mitigate environmental impact. This study introduces an integrated path planning framework designed to systematically tackle the challenges of obstacle avoidance, adherence to kinematic constraints, and optimization of spraying operations, while ensuring complete coverage of target plants. The framework comprises three key components: a local route generator utilizing principal component analysis to minimize movement required for spraying, thereby enhancing efficiency; a global path optimizer that effectively sequences and connects the generated routes to produce collision-free paths; and a path regulator that fine-tunes the resulting paths to comply with the robot's kinematic constraints. Extensive simulations across various outdoor scenarios demonstrate that the proposed framework achieves comprehensive coverage, reduces path lengths, and improves operational efficiency, presenting a viable solution for advanced robotic spraying applications.

关键词： Regulators Robot kinematics Spraying Kinematics Path planning Real-time systems Mobile robots Collision avoidance Optimization Principal component analysis

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

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

引用

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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Research on the characteristics of wireless power transfer in non-ferromagnetic metal pipe

Research on the characteristics of wireless power transfer i...

引用

2020 International Symposium on Electronic Information technology and Communication Engineering, ISEITCE 2020

作者： Li, Changsheng Liu, Yong Hu, Defu Sun, Wei Science and Technology on Electromechanical Dynamic Control Laboratory China Ministerial Key Laboratory of Zndy Nanjing University of Science and Technology Nanjing Jiangsu210094 China

With the development of various electronics, the way of transmitting energy by wire has brought increasingly negative effects on the operability and convenience of products. As wireless power transfer (WPT) technology requires no transmission lines, it has received increasingly wide attention. Most of the previous research on the technology of magnetic resonant coupling WPT mainly focused on the transmission of energy in the air. This paper establishes the wireless power transfer system model under non-ferromagnetic metallic environment and studies the effect of non-ferromagnetic metallic environment on coil self-inductance L, mutual inductance M and coil resistance R of WPT system. On this basis, the study on the relationship between coil diameter and mutual inductance is carried out for aluminium pipe, and the relationship between coil diameter and diameter of metal pipe at the maximum mutual inductance is fitted. Besides, experimental verification is conducted for the change of mutual inductance between the coils of WPT system in the aluminium pipe, presenting that the actual measurement results of mutual inductance in the aluminium pipe are consistent with the theory. © Published under licence by IOP Publishing Ltd.

关键词： Ferromagnetic materials

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Elementary reaction kinetic model of an anode-supported syngas fueled solid oxide fuel cell considering the carbon deposition effect 17

Elementary reaction kinetic model of an anode-supported syng...

引用

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

作者： Zhang, R. Wang, Y. Shi, Y. Wang, Y. Cao, H. National Key Laboratory on Electromechanical Dynamic Control Beijing Institute of Technology Beijing100081 China Department of Energy and Power Engineering Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua University Beijing100084 China

ISBN: (纸本)9781607685395

A one-dimensional transient elementary reaction kinetic model of an anode supported solid oxide fuel cell (SOFC) fueled with syngas is developed considering the carbon deposition effect. This model incorporates the coupling effect of heterogeneous elementary chemical and electrochemical reactions, the electrode microstructure and the charge and mass transport processes. The model is validated by both experimental I-V curves and electrochemical impedance spectra. The simulation results agree reasonably well with the experimental data. The numerical results of carbon deposition simulation indicate that the surface carbon coverage can be decreased by increasing the operating temperature and reducing the carbon dioxide, methane or carbon monoxide in the fuel. © 2021 Electrochemical Society Inc.. All rights reserved.

关键词： Carbon monoxide

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Research on the Characteristics of Wireless Power Transfer in Ferromagnetic Metal Pipe 4

Research on the Characteristics of Wireless Power Transfer i...

引用

2020 4th International Conference on Electrical, Mechanical and Computer Engineering, ICEMCE 2020

作者： Li, Changsheng Sun, Wei Hu, Defu Liu, Yong Science and Technology on Electromechanical Dynamic Control Laboratory China Ministerial Key Laboratory of Zndy Nanjing University of Science and Technology Nanjing Jiangsu210094 China

With the development of society, radio energy transmission technology has been paid more and more attention. However, in the actual application environment, the surrounding metal environment has a significant impact on the radio energy transmission performance. Based on the technology of MRR radio energy transmission, this paper establishes a two coil radio energy transmission model, and analyzes the influence of metal environment on the coil self inductance L, mutual inductance m and coil resistance R of the radio energy transmission system by finite element simulation. On this basis, aiming at the ferromagnetic metal environment, the steel pipe is selected as the research object to study the relationship between coil diameter and mutual inductance in the metal pipe, and the relationship between coil diameter and metal pipe diameter when the maximum mutual inductance is obtained through fitting analysis. At the same time, through the experiment, the mutual inductance between the coils of the wireless energy system in the steel tube is verified, and the experimental results are very consistent with the theory. © Published under licence by IOP Publishing Ltd.

关键词： Ferromagnetic materials

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Microfluidic inertial switch with delay response characteristics 2

Microfluidic inertial switch with delay response characteris...

引用

2nd Spring International Conference on Defence technology, ICDT 2020

作者： Nie, Weirong Liu, Guowei Zhang, Runduo School of Mechanical Engineering Nanjing University of Science and Technology Nanjing China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

This paper proposes an innovation microfluidic inertial switch structure with precise time delay response characteristic, which can be used in the fuze safety and arming system. The switch works on the principle of fluidic inertial force and capillary valve, which makes it sensitive to the unidirection acceleration load and has the ability to recognize the acceleration amplitude. The microfluidic inertial switch has a structure of a J-shaped reservoir, capillary valves, a serpentine delay microchannel and a U-shaped latching microchannel. The acceleration threshold is analyzed theoretically considering the surface tension coefficient of the gas-liquid interface. The delay response time of the switch is studied by finite element simulation based on the Gambit 2.4 and Fluent 6.3 software. The prototype is fabricated by wet etching technology and magnetron sputtering metal technology. Many tests have been done to verify the functions of the switch. The experimental results are matched well to the results of calculation and simulation. When the capillary valve throat widths are 80μm, 120μm, 160μm, the thresholds of the switch are 75.1g, 46.6g, 36.5g. When the switch is loaded with a 75g acceleration load, the delay response is 146.7ms. Finite element simulation and experimental results show that the switch can effectively identify the acceleration threshold, and can achieve a precise delay response under a certain load. © Published under licence by IOP Publishing Ltd.

关键词： Microchannels

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