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SSRN 2024年

作者： Wu, Minchao Li, Ping Lv, Zhao Fan, Cunhang Pei, Shengbing Gao, Xiangping Li, Fan Liang, Wen Anhui Province Key Laboratory of Multimodal Cognitive Computation School of Computer Science and Technology Anhui University Hefei230601 China Civil Aviation Flight University of China Guanghan618307 China Google Research CA94043 United States

Background: Emotion recognition is essential for building human-computer interface (HCI) systems that are more intelligent. To date, emotion recognition has mainly been achieved by decoding electroencephalogram (EEG), speech, and etc, while electro-oculography (EOG) has hardly been used. New method: In this study, we propose a deep learning model, VCLSTM, which combines variational mode decomposition (VMD), convolutional neural network (CNN), and long-short term memory (LSTM) to perform EOG-based emotion recognition. More concretely, we employ VMD to calculate the intrinsic mode functions (IMFs) of EOG signals and emphasize the different frequency informa tion. Furthermore, we sequentially utilize CNN and LSTM to extract the deep temporal features and frequency-sequential features from the IMFs, respectively. Results: Two publicly available datasets, DEAP and OVPD–II, were employed to evaluate the performance of VCLSTM. For DEAP, we achieved a mean accuracy of 90.21% for four classes (high/low valence/arousal). For OVPD–II, which consisted of traditional video patterns and olfactory- enhanced patterns, we achieved mean accuracies of 93.74% and 92.09% for positive, neutral, and negative emotions, respectively. Conclusion: We found that vertical EOG generally outperformed horizontal EOG. Additionally, the experimental results indicated that olfaction could affect the ability of vision to perceive emotional information, especially for negative emotions. © 2024, The Authors. All rights reserved.

关键词： Variational mode decomposition

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Fracture failure analysis of sensor combination pipes

Fracture failure analysis of sensor combination pipes

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2022 International Conference on Optoelectronic Information and Functional Materials, OIFM 2022

作者： Huanping, Kong Changkui, Liu Delin, Liu Aecc Beijing Institute of Aeronautical Materials Beijing China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China Key Lab. of Sci. and Technol. on Aero. Mat. Test. and Evaluation of Aero Engine Corporation of China Beijing China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing China Aecc Failure Analysis Center Beijing China

ISBN: (数字)9781510655126

ISBN: (纸本)9781510655119

The sensor combination pipes fractured during operation. Through macro and micro morphology observation, energy spectrum analysis, metallographic examination and hardness test, the pipes failure properties and reasons were determined. The results showed that the failure property of dynamic pressure pipe was stress corrosion fracture, and the failure property of the static pressure pipe was corrosion fatigue cracking. The pipes failure was related to the absence of stress relief annealing, and mechanical damage on the pipe surface promoted static pressure pipe failure. © 2022 SPIE.

关键词： Corrosion fatigue

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Movable Antenna Enabled ISAC Beamforming Design for Low-Altitude Airborne Vehicles

arXiv

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arXiv 2024年

作者： Xiu, Yue Yang, Songjie Lyu, Wanting Yeoh, Phee Lep Li, Yonghui Ai, Yi National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China Chengdu611731 China School of Science Technology and Engineering University of the Sunshine Coast QLD Australia The School of Electrical and Information Engineering University of Sydney SydneyNSW2006 Australia College of Air Traffic Management Civil Aviation Flight University of China Deyang618311 China

In mobile systems with low-altitude vehicles, integrated sensing and communication (ISAC) is considered an effective approach to increase the transmission rate due to limited spectrum resources. To further improve the ISAC performance, this paper proposes a novel method called integrated sensing and communication-movable antenna (ISAC-MA) to optimize the antenna’s position. Our goal is to support low-space vehicles by optimizing radar and communication joint beamforming and antenna position in the presence of clutter. This scheme not only guarantees the required signal-to-noise ratio (SNR) for sensing but also further improves the SNR for communication. A successive convex approximation (SCA)-based block coordinate descent (BCD) algorithm is proposed to maximize communication capacity under the condition of sensing SNR. Numerical results show that, compared with the traditional ISAC system and various benchmark schemes, the proposed ISAC-MA system can achieve higher communication capacity under the same sensing SNR constraints. Copyright © 2024, The Authors. All rights reserved.

关键词： Radar antennas

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Novel High Entropy Double Pervoskite Cathode for Solid Oxide Fuel Cells

SSRN

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SSRN 2023年

作者： Wang, Cheng Cheng Zheng, Ziheng Luo, Xinlei Hou, Bingxue Liu, Bo Jia, Lichao Xie, Xianpan Luo, Dawei Shen Zhen Polytechnic University Shenzhen518055 China Aviation Engineering Institute Civil Aviation Flight University of China Guanghan618037 China Center for Fuel Cell Innovation State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science & Technology Wuhan430074 China

To attain superior electrochemical performance, a new series of high-entropy double perovskites are investigated as cathodes for solid oxide fuel cells. In this study, three kinds of LaBa0.5Sr0.5Co1.5Fe0.5O5+δ(LPBSCF) double perovskites with different dopings of La, Pr, Sm, Gd, Nd, Y elements in A-site, high-entropy double perovskites (HEDP) cathodes are successfully prepared by a EDTA-citrate combustion method and used as potential cathodes for SOFC at intermediate temperature. Three HEDP cathodes all form single phase perovskite structure and matches chemically well with Gd0.2Ce0.8O2-δ(GDC) electrolyte. The linear thermal expansion coefficient in the RT-900 °C range is found to be moderate, 18.39×10-6 *** anode supported SOFC with (La0.2Pr0.2Sm0.2Gd0.2Nd0.2)Ba0.5Sr0.5Co1.5Fe0.5O5(LPSGNBSCF)-HEDP cathode exhibits an excellent output performance of 1000 mW·cm-2 with a lower polarization resistance of 0.3 Ω·cm2 at 800 °C. These results might suggest that HEDP-LPSGNBSCF can be a potential excellent cathode for SOFCs. © 2023, The Authors. All rights reserved.

关键词： Cathodes

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Investigation of Friction and Vibration Performance of Lithium Complex Grease Containing Candle Soot on aviation Electrical Machine

SSRN

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SSRN 2024年

作者： Li, Kangshuai Zhang, Yanbin Tan, Wenkai Wang, Jiwen Xu, Zehua Li, Zhanjun He, Qiang School of Mechatronics Engineering Henan University of Science and Technology Henan Luoyang471003 China College of Civil Aviation Safety Engineering Civil Aviation Flight University of China Sichuan Guanghan618307 China Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province Guanghan618307 China Sichuan Key Technology Engineering Research Center for All-electric Navigable Aircraft Sichuan Guanghan618307 China Anyang Institute of Technology Anyang455000 China

Abstract: The prolonged operation of the motor in the all-electric aircraft can cause the fragmentation and shortening of grease thickener fibers, ultimately resulting in the lubricating grease becoming ineffective. In order to avoid grease failure causing motor winding burnout, this paper uses a four-ball friction testing machine to test the tribological properties of six composite greases containing candle soot with different concentrations, and analyzes the changes in friction coefficient and wear diameter. In addition, by building a test platform for motor vibration and noise, this paper studies the influence of lithium complex grease on vibration and noise characteristics of aviation electrical machine at different propeller speeds. The results show that the addition of 0.04wt% candle soot lithium grease has the best tribological properties and vibration inhibition properties, because the candle soot in the oil film changes the sliding friction into rolling friction in the contact area of some friction pair. The temperature rise test of aviation electrical machine shows that the compound lithium grease plays an active role in the heat dissipation performance of the high speed rotating motor. © 2024, The Authors. All rights reserved.

关键词： Wear of materials

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Research on Reward Distribution Mechanism Based on Temporal Attention in Episodic Multi-Agent Reinforcement Learning

Research on Reward Distribution Mechanism Based on Temporal ...

引用

Artificial Intelligence technology (ACAIT), Asian Conference on

作者： Baofu Fang Mingkuan Cao Zaijun Wang Hao Wang School of Computer Science and Information Engineering (Hefei University of Technology) Intelligent Interconnected Systems Laboratory of Anhui Province (Hefei University of Technology) Hefei China Key Laboratory of Flight Techniques and Flight Safety (Civil Aviation Flight University of China) Guanghan China

In episodic multi-agent reinforcement learning, we study how to distribute episodic rewards at the end of an episode by trajectory time steps to obtain high-quality and interpretable learning reward signals to guide agent training. This paper proposes a reward distribution method based on temporal attention. This method is used to characterize the influence of actions on state transitions along the trajectory, and the effect of each influence on the global reward at each time step. This method is combined with a deep deterministic strategy, and a multi-agent algorithm based on the temporal attention reward distribution mechanism is proposed to speed up the convergence speed of the agent. The effectiveness of the algorithm is verified in a multi-agent pursuit environment. Compared with other reward distribution methods, the method in this paper converges faster and obtains higher rewards.

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Analysis of the Texture Evolution During Multipass Tube Spinning of a Ta15 Alloy Using the Crystal Plasticity Finite Element Model

SSRN

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SSRN 2023年

作者： Wang, Xianxian Wu, Wenhao Zhan, Mei Zheng, Zebang Li, Zhixin Liu, Tao School of Mechanical and Electrical Engineering Shaanxi University of Science and Technology Xi’an710021 China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Xi’an710072 China School of Science Civil Aviation Flight University of China Guanghan618307 China

In this study, we present an explicit crystal plasticity finite element model (CPFEM) to investigate the texture evolution during multipass tube spinning of a TA15 alloy. The texture formation mechanism is further revealed by analyzing grain rotation and slip behaviors. The results indicate that, for the grains whose c-axis are far from the normal direction (ND), basal slip is dominant under the significant compression deformation state of spinning. Therefore, the c-axis gradually turns toward the ND. However, for the grains whose c-axis are close to ND, the contribution ratios of prism , pyramidal and pyramidal increase, especially that of prism . Under these conditions, the c-axis deviates slightly from the ND, and grains mainly rotate around the c-axis. Therefore, most of the {0001} poles cluster around the ND and {10-10} poles are distributed in the rolling-hoop plane, exhibiting an obvious basal texture component. These results imply that the CPFEM can effectively predict the formation of basal texture component during spinning. With an increase in the number of spinning pass, the texture distribution becomes slightly inhomogeneous along the ND owing to the uneven distribution of macroscopic strain. In addition, the grain rotation first increases and then decreases with deformation. The smaller grain rotation at the first pass is because a large number of basal preferentially operates in the grain with favorable orientation, resulting in localized inhomogeneous deformation. The decrease at larger deformation is due to the lower Schmidt factor of basal , which limits the grain rotation. © 2023, The Authors. All rights reserved.

关键词： Prisms

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Janus vortex beams realized via liquid crystal Pancharatnam–Berry phase elements

引用

Advanced Photonics Nexus 2022年第2期1卷 36-44页

作者： Bing-Yan Wei Yuan Zhang Haozhe Xiong Sheng Liu Peng Li Dandan Wen Jianlin Zhao Northwestern Polytechnical University School of Physical Science and TechnologyShaanxi Key Laboratory of Optical Information TechnologyXi’anChina Ministry of Industry and Information Technology Key Laboratory of Light Field Manipulation and Information AcquisitionXi’anChina Chinese Flight Test Establishment Xi’anChina

Emerging as a family of waves,Janus waves are known to have“real”and“virtual”components under inversion of the propagation *** tremendous interest has been evoked in vortex beams featuring spiral wavefronts,little research has been devoted to the vortex beam embedded Janus waves,i.e.,Janus vortex *** propose a liquid crystal(LC)Pancharatnam–Berry(PB)phase element to demonstrate the realization of the Janus vortex beams and the modulation of the associated orbit angular momentum(OAM)and spin angular momentum(SAM).The generated Janus vortex beams show opposite OAM and SAM states at two distinct foci,revealing a spin-orbit interaction during propagation enabled by the LC PB phase element,which may play special roles in applications such as optical encryption and *** merits like reconfigurability and flexible switching between Janus vortex beams and autofocusing or autodefocusing vortex beams additionally increase the degree of freedom of manipulating vortex *** work provides a platform for tailoring complex structured light and may enrich the applications of vortex beams in classical and quantum optics.

关键词： Janus vortex beam liquid crystal Pancharatnam-Berry phase orbit angular momentum spin angular momentum

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Failure analysis of smoke lampblack machine crack

Failure analysis of smoke lampblack machine crack

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2022 International Conference on Metallurgical Engineering and Automation technology, MEAT 2022

作者： Kong, Huanping Jiang, Tao Zhao, Kai Liu, Changkui AECC Beijing Institute of Aeronautical Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Key Lab. of Sci. and Technol. on Aero. Mat. Test. and Evaluation of Aero Engine Corporation of China Beijing100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China AECC Failure Analysis Center Beijing100095 China

The smoke lampblack machine cracked in use. Through macro and micro morphology observation, energy spectrum detection, metallographic examination and finite element simulation calculation and analysis, the failure nature and reason of the smoke lampblack machine were determined. The results showed that the cracking property was corrosion fatigue, and the cracking of the smoke lampblack machine was caused by the damage of the protective layer in the vibration environment. It was suggested that the surface protection of smoke lampblack machine should be strengthened and the structural design of stress concentration should be improved. © Published under licence by IOP Publishing Ltd.

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Selective production of monocyclic aromatic hydrocarbon from agricultural waste wheat straw for aviation fuel using Ni/ZSM-5 catalyst

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Biomass and Bioenergy 2022年第0期165卷

作者： Pan, Hongling Zhou, Xuan Xie, Shuixiang Du, Zhicai Li, Guotao Zhang, Chunquan Luo, Yan Zhang, Xuefeng Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province Civil Aviation Flight University of China Guanghan618307 China College of Civil Aviation Safety Engineering Civil Aviation Flight University of China Guanghan618307 China State Key Laboratory of Petroleum Pollution Control CNPC Research Institute of Safety & Environment Technology Beijing102206 China Sichuan Your Lab Test Technology Co. Ltd. Chengdu610051 China Department of Sustainable Bioproducts Mississippi State University Mississippi State MS39762 United States

Aromatic is a vital chemical raw material and product as well as an essential component for aviation fuel. Bio-based aromatics, especially the monocyclic aromatic hydrocarbon, are beneficial for the green chemical process and aviation fuel development. In this research, firstly, the effects of different kinds of metal catalysts (Pt/C, Rh/C, Ru/C, Pd/C, 65 wt% Ni/SiO2–Al2O3) on the pyrolysis behavior and aromatic hydrocarbons selectivity of four kinds of agricultural and forestry waste biomass (wheat straw, rape straw, poplar sawdust, and bamboo powder) were systematically investigated. The research results showed that the selectivity of aromatics has been largely increased in the presence of 65 wt% Ni/SiO2–Al2O3 while the carbon-based noble catalysts had few impacts on aromatics production. Furtherly, zeolite with different Si/Al ratios (5:18, 5:50, 5:85, 5:300, and 5:470) and the Ni loading amounts (5, 10, 15, 20, 25 wt%) were systematically studied. The series of Ni/ZSM-5 catalyst reduced the phenolic components in the pyrolysis products, and significantly increased the relative content of the target product aromatics, and the proportion of monocyclic aromatic hydrocarbons in the aromatic. The research results showed the ZSM-5 with the Si/Al ratio of 5:18 had the best catalytic properties for aromatic production. The loading of 10 wt% of Ni (10 wt% Ni/ZSM-5, Si/Al = 5:18) further boosted the catalytic performance for wheat straw, achieving the highest relative concentration of aromatic at 67%, of which the ratio of monocyclic aromatic hydrocarbon was 55%. © 2022 Elsevier Ltd

关键词： Aromatization

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