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检索条件"机构=Science and Technology on Electormechanical Dynamic Control Laboratory"

共 372 条记录，以下是81-90 订阅

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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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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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Simulation and Analysis of Position Change Deviation of Equivalent Measurement of Time Domain Transient Magnetic Field Differential Probe 17th

Simulation and Analysis of Position Change Deviation of Equi...

引用

17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Li, Fadong Cao, Ronggang Li, Jiawu Cao, Yuxi Zhou, Yu Zhang, Anqi Science and Technology On Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China Tangshan063611 China

ISBN: (纸本)9789819903566

This paper used Ls-Dyna to simulate the measurement process of the differential probe in the time-domain transient magnetic field, then figure out the displacement-time and velocity-time data measured by the differential probes. There is a variation in the equivalent measurement position of the differential probes by comparing the displacement data of the probes with the corresponding simulation values. From the simulation results. In the previous phase of the armature acceleration, the probe displacement deviates significantly from the simulated value;with the increase of the armature velocity, this value fluctuates;at the telophase of acceleration, the displacement difference is negligible. The equivalent displacement deviation of the corresponding simulation value shows positive and negative fluctuations based on the displacement difference of adjacent probes. Excluding extreme cases, the absolute value of the deviation is within 5%;at the acceleration telophase, it is within 2%. This deviation makes the output of the differential probes inaccurate in the time domain, which is significant for the related experiments when measuring the transient information of the armature motion in the electromagnetic launch by the differential probe. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Probes

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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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A Design on Silicon-Based Millimeter-Wave Low Noise Amplifier Circuits 7

A Design on Silicon-Based Millimeter-Wave Low Noise Amplifie...

引用

7th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2024

作者： Xing, Zikang Liang, Qiuyan Xu, Rui Science and Technology on Electromechanical Dynamic Control Laboratory China Xi'an Institute of Electromechanical Information Technology Xi'an710065 China

ISBN: (纸本)9798350384437

This paper investigates the technology of silicon-based millimeter-wave low noise amplifiers (LNA). The LNA consist of two stages of amplifiers connected in cascade. The first stage circuit achieves low noise performance by utilizing minimum noise input matching. The second stage achieves high gain performance by utilizing high gain output matching.. The LNA in this paper achieves a gain S21 of 16 dB at a center frequency of 36 GHz with a noise figure (NF) as small as 5 dB. © 2024 IEEE.

关键词： Low noise amplifiers

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Segmentation Clustering Algorithm for Point Cloud Processing of Targets on the Ground 3

Segmentation Clustering Algorithm for Point Cloud Processing...

引用

3rd International Conference on Defence technology, ICDT 2022

作者： Huang, Jinbo Zheng, Zhen Zhang, Yifei Zhou, Yu School of Mechanical Engineering Nanjing University of Science and Technology Nanjing210094 China Science and Technology on Electromechanical Dynamic Control Laboratory China

After the ground extraction algorithm, there are multiple objects, including the target in the non-ground point cloud. To effectively extract the features of individual objects and overcome the dependence of the traditional algorithm based on the normal vector and curvature of the region growing point cloud segmentation method on the initial point, the normal vector angle in the neighborhood, and the curvature threshold selection. In this paper, we propose a fast clustering segmentation method for region-growing point clouds based on neighborhood density. The test results show that the point cloud segmentation algorithm proposed in this paper has better performance than the traditional Euclidean clustering point cloud segmentation algorithm and region growing point cloud segmentation algorithm in terms of timeliness and correct segmentation rate. This new segmentation clustering algorithm can quickly implement automatic point cloud clustering segmentation of ground objects. © Published under licence by IOP Publishing Ltd.

关键词： Clustering algorithms

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Joint radar and communication based on piece-wised LFM signals 4

Joint radar and communication based on piece-wised LFM signa...

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4th International Conference on Defence technology, ICDT 2024

作者： Wang, Xin Duu, Yingsen Zhang, Xiang Wu, Dan Zhang, Ke Xi'an Institute of Electromechanical Information Technology Xi'an China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

Existing joint radar detection and communication(JDC] systems suffer from high peak-to-average power ratiofPAPR] or distance blind spot zones. In this paper, we present a novel JDC system based on piece-wised linear frequency modulation(LFM] signals. Based on the proposed piece-wised LFM modulation signal, the novel JDC system can achieve linear frequency modulation continuous wave(LFMCW) detection, and the PAPR and blind zone issues are solved. Besides, spread spectrum communication can be simultaneously conducted with the same modulation signal. Simulation results show that the proposed JDC system has similar detection performance to the traditional sawtooth LFMCW detection scheme, and the bit-error rate of communication is less than 10~6 when the the bit rate is 500kbps and the signal-to-noise ratio is 10 dB. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Frequency modulation

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A Tolerance Precision control Method Based on the Internal and External Double-layer Pressure Screw Limits 4

A Tolerance Precision Control Method Based on the Internal a...

引用

4th International Conference on Defence technology, ICDT 2024

作者： Sun, Chengcheng Ma, Hongping Tian, Zhongwang Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China Xi'an Institute on Electromechanical Information Technology Xi'an China

In order to solve the problem that the assembly axial clearance of large-diameter mechanical trigger fuze delay device is large in the fuze body, a tolerance precision control method based on the internal and external double-layer pressure screw limits is proposed. The internal and external double-layer screw threads constitute two sets of independent redundant dimensional chains in distribution direction and value. The final assembly accuracy of the delay device is adjusted by the internal and external double-layer pressure screw mutually. The minimum coaxiality deviation of assembly can achieve 0 deviation, and the average accuracy of assembly coaxiality is increased by about 30.69%, which has obvious effect in reducing axis eccentricity. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Screw threads

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Accurate azimuth estimation method for FMCW radar based on moving arrays

Accurate azimuth estimation method for FMCW radar based on m...

引用

2024 International Conference on Image, Signal Processing, and Pattern Recognition, ISPP 2024

作者： An, Tai Yan, Xiaopeng Han, Yanwen Dai, Jian Wang, Jiawei Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781510680425

Addressing the current challenges of weak target azimuth detection and inadequate precision in frequency modulated continuous wave (FMCW) radar systems, this paper proposes a novel method for precise imaging based on a motion array using FMCW radar for accurate range and azimuth estimation. The approach involves the use of a millimeter-wave FMCW radar with a motion array to capture target angular information, leading to a substantial improvement in azimuth estimation resolution, particularly for munitions. Additionally, spatial Fourier transform array signal processing is employed to achieve two-dimensional precise imaging of radar targets, encompassing both range and azimuth dimensions. Experimental results validate the effectiveness of the proposed approach, showcasing an enhanced angular resolution of the millimeter-wave radar, reaching 2.6°. The method demonstrates favorable azimuth estimation outcomes in diverse scenarios, including those involving multiple and planar targets. Overall, the introduced technique significantly elevates the precise detection capability of automotive millimeter-wave radar systems. © 2024 SPIE.

关键词： Radar imaging

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Low SNR FM signal preprocessing method based on low-order cyclic statistics and WVD distribution 2

Low SNR FM signal preprocessing method based on low-order cy...

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2nd International Conference on Robotics, Artificial Intelligence and Intelligent control, RAIIC 2023

作者： Li, Jianfeng Huang, Dingkun Yan, Xiaopeng Dai, Jian Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing100081 China

ISBN: (纸本)9798350328004

In order to solve the problem of poor noise suppression effect and long processing time of FM signal under the condition of low SNR by traditional preprocessing methods, a signal preprocessing method based on low-order cyclic statistics and WVD distribution is proposed. The method firstly calculates the cyclic mean value of incoming wave signal, and then transforms the incoming wave signal domain through IFFT algorithm with variable points. Finally, the time-frequency ridge of the FM signal is obtained by WVD time-frequency analysis, and the binary image transformation is carried out. Through simulation analysis, the time-frequency preprocessing method proposed in this paper can greatly reduce the calculation amount and improve the real-time performance while retaining the accuracy of time-frequency features, and provide effective support for subsequent sorting identification and parameter estimation. © 2023 IEEE.

关键词： Binary images

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