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

作者： Li, Wei Li, Tie Huang, Dengdian Xie, Yue Science and Technology on Electromechanical Dynamic Control Laboratory Xian China

ISBN: (纸本)9781665418126

The RCS of the almond model which was affected by the change from electromagnetic parameters (ϵ and mu) of the absorbing patch was researched, and the moment method was utilized. The varepsilon andμ of the absorbing patch can be measured and the values were assumed to vary with equal difference in the interval of 5%30%, the measured values of varepsilon and mu worked as variable which were used to calculate the RCS of the almond model with the different varepsilon and mu of the patch. Here, two almond model RCS were obtained, one is circumferential RCS which generated by the gradient of varepsilon and mu of absorbing patch, and the other Radar Cross-Section (RCS) generated by the known electromagnetic parameter measurements. Comparing the two RCS mentioned above, the calculated results show that for the HH polarization, the undulation values of the almond model RCS vary within 0.4dB when the real part of varepsilon and mu of the absorbing patch vary within 5%-30% at 10GHz, and for the VV polarization, the undulation values changes within 2.5 dB, Moreover, the polar differences of both polarizations decrease with the increase of the real part of the varepsilon and mu, in both polarization modes, the polar RCS is sensitive to the variation of varepsilon and mu, and the VV polarization is much more sensitive than the HH polarization. © 2021 IEEE.

关键词： Radar cross section

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The Application of Immune Genetic Algorithm in BP Neural Network 6

The Application of Immune Genetic Algorithm in BP Neural Net...

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6th IEEE International Conference on Intelligent Computing and Signal Processing, ICSP 2021

作者： Yichang, Zhao Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9780738143705

Randomly generating the initial weights and thresholds of the neural network will bring uncertainty to the network. We used genetic algorithms to optimize the initial weights and thresholds of the neural network. However, the genetic algorithm may have the problem of premature population maturity during its operation, that is, the algorithm has converged before reaching the global optimal solution. To this end, the immune genetic algorithm is used to optimize the initial weights and thresholds of the neural network to avoid premature maturity of the population. A binary classification problem model is established. From the simulation training results, the use of immune genetic algorithm to optimize the BP neural network can more effectively prevent the network from falling into a local minimum during training, improve the network convergence speed, and complete it more accurately and stably Two classification problems. © 2021 IEEE.

关键词： Genetic algorithms

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A review on the preparation and properties of energetic materials for micro pyrotechnic trains

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Results in Engineering 2025年 26卷

作者： Liao, Dongjie Lou, Wenzhong Feng, Hengzhen Kan, Wenxing Li, Zhipeng Lu, Yi School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China

Micro pyrotechnic train is an energetic microsystem that integrates MEMS control circuits, micro energetic devices, micro safety mechanisms, and micro output charges. It has been actively promoted and applied in space technology, healthcare, and ordnance due to its outstanding advantages of miniaturization, high efficiency, and intelligence. Micro pyrotechnic train mainly achieves functions such as ignition, propulsion, or detonation through the energetic materials filled inside it. As the core of micro pyrotechnic trains, energetic materials and their development have always been a highly concerned subject. Herein, this paper analyzes and summarizes the research progress of advanced energetic materials, such as two-dimensional energetic materials, metastable intermolecular composites and green primary explosives. Moreover, the application of additive manufacturing technology and in-situ synthesis methods (gas-solid phase chemical reactions, electrically assisted chemical reactions) in the preparation of advanced energetic materials was discussed. Furthermore, suggestions regarding the possible future research directions are proposed. © 2025 The Author(s)

关键词： Detonation

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Application of Target Electromagnetic Scattering Characteristics in Short-Range Dynamic Detection 13

Application of Target Electromagnetic Scattering Characteris...

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

作者： Hu, Wenhui Li, Gang Li, Wei Tian, Bo Li, Tie Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9781665418126

In view of the way that radio fuse probe target for echo information with dynamic scanning detection in the scene of near-field, this paper designed an experiment of the application scheme, which the scheme used radar to image electromagnetic scattering from a target of interest, the complex echo signals in the detection results were divided according to the time series and the RCS mean value of the corresponding region was calibrated, thus the time-resolved/part-resolved target information can be used in the design and verification of near-field detector, providing a new method for the application of target characteristic information in the process of short-range dynamic detection. © 2021 IEEE.

关键词： Electromagnetic wave scattering

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NUMERICAL SIMULATION AND EXPERIMENTAL RESEARCH ON TAYLOR COUETTE FLOW CHARACTERISTICS IN AIR GAP OF AVIATION MOTOR

NUMERICAL SIMULATION AND EXPERIMENTAL RESEARCH ON TAYLOR COU...

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2024 CSAA/IET International Conference on Aircraft Utility Systems, AUS 2024

作者： Ma, Hui Liang, Shuyue Zhan, Hongbo Qi, Lin Chen, Weijian Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration No.33 Shuige Road Nanjing China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Areonautics and Astronautics No.29 Yudao Street Nanjing China

A test bench with PIV technology was built and visualization research on Taylor vortex between concentric rotating cylinders was carried out to explore the flow morphology within the annular gap by changing the rotational speed of the inner cylinder. The numerical method and accuracy were verified by experiments. The selected turbulence model was then applied for numerical simulation of the Taylor Couette flow in a simplified air gap model of an aviation motor with smooth inner and outer walls. The Taylor Couette flow characteristics in the air gap under varying rotational speed were studied, and simulation results were given for flow with axial flow and without axial flow. © The Institution of Engineering & technology 2024.

关键词： Axial flow

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Fuze Echo Recognition Based on Improved V-G Convolutional Neural Network

Fuze Echo Recognition Based on Improved V-G Convolutional Ne...

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

作者： Dengdian Huang Bo Tian Tie Li Yali Hou Science and Technology on Electromechanical Dyamic Control Laboratory XityCountry

ISBN: (纸本)9781665418133

In order to solve the problem that it is difficult for the traditional fuse target recognition algorithm to recognize the object with the same size as the target under the condition of ground object coupling and low signal-to-noise ratio, the V-G convolution neural network is used for Fuse echo The improved V-G convolution neural network is used in this method, and the data of laser and radio fuse missile target rendezvous is used as The improved V-G convolution neural network is used in this method, and the data of laser and radio fuse missile target rendezvous is used as the training library to identify the targets outside the library and classify the targets inside the library. The simulation results show that the recognition accuracy is more than 95%, and the fuse echo recognition can be carried out efficiently.

关键词： Training Missiles Fuses Target recognition Convolution Neural networks Lasers

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An Overall Weighted Fusion Algorithm Based on Dynamic Optimal Estimation

An Overall Weighted Fusion Algorithm Based on Dynamic Optima...

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control, Electronics and Computer technology (ICCECT), IEEE International Conference on

作者： Zehu Wang Guanglin He Yukuan Liu Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

Based on the background of cooperative detection of target by multiple UAVs, this paper proposes an efficient multi-sensor data fusion algorithm, which is called the overall weighted fusion algorithm based on dynamic optimal estimation (abbreviated as DOE-OWFA) Based on the weighted fusion by the least squares method, the algorithm makes full use of the state estimation property of Kalman Alter for data processing and state estimation. In order to evaluate the performance of the algorithm, we conducted simulation tests with the help of MATLAB. The simulation results show that the algorithm proposed in this paper has higher fusion accuracy and better robustness compared with the same type of algorithms.

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A X/Ka-Band Low-Profile Double-Conical-Beams Antenna with Vortex Electromagnetic Waves

A X/Ka-Band Low-Profile Double-Conical-Beams Antenna with Vo...

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IEEE International Wireless Symposium (IWS)

作者： Dongjie Qin Weishan Li Jie Ma Yiping Zang Xu Zhao Xi'an Institute of Electromechanical Information Technology Xi'an China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

Antennas with conical beams have the advantage in anti-interference applications. This paper proposes a low-profile antenna with two conical beams working at X and Ka bands. To save space, a Ka-band multi-ring antenna composed of one circular plate and five concentric rings is placed on the center of an X-band uniform circular array (UCA) antenna formed by eight microstrip patches. A vortex electromagnetic wave (VEW) with mode 1 is generated with the UCA antenna with phase difference of the elements of 45 deg. With different phase difference, the higher modes of the VEW can be formed. The cylindrical cavity not only serves as the cavity of the Ka-band antenna, but also physically separates the two antennas which makes them do not interference with each other. The peak gain at 37.5GHz of Ka band is 12.4dBi, and the 3dB beamwidth is in the range of 6.9-24.4deg. The peak gain at 10GHz of X band is 8.2dBi, and the 3dB beamwidth is in the range of 12.8-43deg.

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Use Anchor-Free Based Object Detectors to Detect Surface Defects

Use Anchor-Free Based Object Detectors to Detect Surface Def...

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TEPEN International Workshop on Fault Diagnostics and Prognostics, TEPEN-IWFDP 2024

作者： Liu, Jiaxue Zhang, Chao Li, Jianjun College of Mechanical Engineering Inner Mongolia University of Science and Technology Baotou014000 China Inner Mongolia Autonomous Region Key Laboratory of Intelligent Diagnosis and Control of Electromechanical Systems Baotou014010 China College of Information Engineering Inner Mongolia University of Science and Technology Baotou014000 China

ISBN: (纸本)9783031702341

Many anchor-based object detectors have limitations in the detection process because of the presence of anchors. Therefore, in recent years, many researchers have shifted their focus to designing anchor-free object detectors. In this paper, we initially employ several common anchor-free detectors (CenterNet, FCOS, YOLOX-S, and YOLOV8-S) to detect surface defects in the hot-rolled strip datasets from Northeastern University (NEU-DET). Following experimental comparisons, YOLOV8-S demonstrates the best detection performance (mAP is 78.04% and the FPS is 8.45). Secondly, we utilize transfer learning to mitigate the overfitting problem that large models can induce on small datasets. Finally, we conduct a large number of experimental comparisons to verify the effectiveness of the model. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Transfer learning

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UAV Training control and Evaluation Method Based on Dynamic Task Construction 17th

UAV Training Control and Evaluation Method Based on Dynamic ...

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17th Chinese Intelligent Systems Conference, CISC 2021

作者： Tong, Jiahui Zhang, Qing Ran, Jian Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China Beijing Electromechanical Engineering Institute Beijing China

ISBN: (纸本)9789811663277

In view of the problems such as high cost, low training efficiency and lack of versatility, a design scheme of UAV simulation training system based on dynamic mission construction is proposed, and the reproducing dynamic mission environment simulation technology and UAV training control and result evaluation and method are described in detail. The evaluation system of UAV simulation training results based on multi-factor influence data is constructed, which can effectively guide the simulation training of multi-type UAV and improve the overall training effect of UAV operators by synthesizing historical training data and real-time training data. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Unmanned aerial vehicles (UAV)

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