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SSRN 2024年

作者： Wu, Yue Wang, Fusheng Sun, Jinru Ma, Xiangteng Huang, Chenguang Fan, Zhiqiang Wang, Shaozhen Wang, Chenglin Gao, Yunpeng Lv, Chenyang Duan, Zemin Yao, Xueling School of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Xi’an710129 China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Shaanxi Xi’an710049 China Designing Institute of Hubei Aerospace Technology Academy Wuhan430040 China Aviation Key Laboratory of Science and Technology on High Intensity Electromagnetic Environment Protection Anhui230031 China Anhui Province Key Laboratory of Aircraft Lightning Protection Anhui230031 China

Carbon fiber reinforced polymer (CFRP) is prone to expose in intense lightning strike, suffering complex multi-physical effects. These effects involve electrical, magnetic, thermal, chemical, fluidic, and solid fields, containing intricate feedback in damage driving that remains unclear. In this study, we discover and identify the positive and negative feedback between the entangled lightning effects in anisotropic CFRP through self-developed experiments and high-fidelity simulations. Lightning ablation, thermal strain, Lorentz force, and overpressure effects are intertwined, which forms distinctive positive and negative feedback in structure responses and micro equivalent circuits through multifaceted action forms and energy transformation. Feedback relationships dynamically change with time and locations. Thermal strain dominates lightning mechanical effects, which is counteracted by overpressure and Lorentz force effects, particularly around edges of lightning region. Positive feedback exists between ablation and mechanical effects. Ablation crater accelerates current to flow in depth. Mechanical effects encourage current and damage to extend along upper layers. These findings disclose intrinsic action mechanisms of lightning strike, which support protection of anisotropic composites in strong electromagnetism environments. © 2024, The Authors. All rights reserved.

关键词： Ablation

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Cross-Scale Coupling Analysis Method for Otsg in Sfr and its Application

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SSRN 2023年

作者： Zhang, Zhenguo Li, Xiaochang Tan, Sichao Tian, Ruifeng Liu, Kai Cheng, Hui College of Nuclear Science and Technology Harbin Engineering University Harbin150001 China College of Aerospace and Civil Engineering Harbin Engineering University Harbin150001 China Heilongjiang Provincial Key Laboratory of Nuclear Power System and Equipment China

This paper based on the full-regime flow boiling heat transfer model and the flow pattern discrimination model, a one-dimensional full-regime flow boiling heat transfer model from subcooled water to superheated steam on tube-side and its cross-scale coupling solution model with the three-dimensional refined CFD model on the shell side are established. The effectiveness of the coupling analysis model was verified by comparative analysis with experimental data. The independent coupling of the water-side of the OTSG with the sodium-side 3D fluid domain is realized. The results show that the cross-scale coupling method can accurately predict the temperature distribution and the main heat transfer characteristic points on the full height of tubes, and can obtain the temperature difference between each tubes and tube walls. The cross-scale coupled method avoids the direct adoption of the multiphase flow model, which significantly improves the efficiency and stability of the solution of the full-size OTSG. © 2023, The Authors. All rights reserved.

关键词： Flow patterns

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Efficient Module-Lattice-based Certificateless Online/Offline Signcryption Scheme for Internet of Medical Things

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IEEE Internet of Things Journal 2025年

作者： Bai, Ye He, Debiao Yang, Zhichao Luo, Min Peng, Cong Wuhan University Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of Education School of Cyber Science and Engineering Wuhan430072 China Wuhan University School of Cyber Science and Engineering Wuhan430072 China Qilu University of Technology Shandong Academy of Sciences Key Laboratory of Computing Power Network and Information Security Ministry of Education Shandong Computer Science Center Jinan250014 China Naval University of Engineering Department of Information Security Wuhan430000 China Shandong Fundamental Research Center for Computer Science Shandong Provincial Key Laboratory of Industrial Network and Information System Security Jinan250014 China

The Internet of Medical Things (IoMT) has achieved remote diagnosis and real-time health monitoring through intelligent sensor devices and Internet of Things (IoT) technology, providing great convenience for analyzing medical conditions between doctors and patients. However, sensitive information such as patient medical data may face security challenges such as data leakage and abuse during transmission in the IoMT. To ensure the confidentiality and unforgeability of medical data transmission, scholars have proposed many cryptographic schemes. With the development of quantum computers, schemes based on traditional cryptographic primitives have become insecure. Existing cryptographic schemes for IoMT cannot simultaneously meet the security requirements of high communication performance, low computational overhead, and resistance to quantum attacks. Therefore, we propose an efficient module-lattice-based certificateless online/offline signcryption (MLCLOOSC) scheme resistant to quantum attacks while meeting the confidentiality and unforgeability requirements under Type I and Type II attacks. Compared with five recent CLOOSC schemes, theoretical analysis, and experimental test results show that the proposed scheme outperforms the other five schemes regarding computational and communication costs and security. Therefore, our scheme is more suitable for application in IoMT scenarios. © 2014 IEEE.

关键词： Quantum computers

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Modal Analysis of Lead-Bismuth Eutectic Flow in a Single Wire-Wrap Rod Channel

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SSRN 2022年

作者： Zhao, Xielin Cheng, Qian Yu, Xiaofei Huang, Qian Zhang, Ke Feng, Zhipeng Zhou, Jinxiong State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Xi'an Jiaotong University Xi'An710049 China Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute of China Chengdu610200 China

The thermal-hydraulics as well as flow-induced vibration of wire-wrapped rod bundles calls for accurate and efficient liquid metal flow simulation and prediction, yet it remains a challenge due to the complex geometries and high Reynolds number flow in wire-wrapped rod channel. Previous efforts towards this goal exclusively adopts full-order modeling (FOM), which is prohibitively computation-intensive. This work reports the first reference on modal analysis of the turbulent lead-bismuth eutectic (LBE) flow in a single wire-wrapped rod channel by a data-driven dynamic mode decomposition (DMD) method. The spatio-temporal data of fluid velocities and pressure were modelled and collected by using the Reynolds-averaged NavierStokes equations (RANS) approach with stress-omega RSM turbulence model. Model analysis was performed over the snapshot matrices and DMD modes and corresponding eigenvalues were calculated. The DMD modes and eigenvalues were then used to construct a reducedorder modeling (ROM) system for fast fluid field reconstruction and short-term forecasting. The correctness and feasibility of the method was demonstrated and compared with groundtruth CFD simulation results. Our method offers a fast and reliable approach for ROM of turbulent flow in wire-wrapped rod fuel assemblies. We publicize all the data and codes via https://***/XJTU-Zhou-group/Wire-wrapped-fuel-pin-CFD-DMD. © 2022, The Authors. All rights reserved.

关键词： Dynamic mode decomposition

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Physics-informed Neural Network for system identification of rotors ⁎

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IFAC-PapersOnLine 2024年第15期58卷 307-312页

作者： Xue Liu Wei Cheng Ji Xing Xuefeng Chen Zhibin Zhao Rongyong Zhang Qian Huang Jinqi Lu Hongpeng Zhou Wei Xing Zheng Wei Pan The National Key Laboratory of Aerospace Power System and Plasma Technology and School of Mechanical Engineering Xi’an Jiaotong University Xi’an China China Nuclear Power Engineering Co. Ltd. Beijing China Shanghai Apollo Machinery Co. Ltd. Shanghai China Department of Computer Science University of Manchester Manchester United Kingdom School of Computer Data and Mathematical Sciences Western Sydney University Sydney Australia

The condition of the rotor system remains difficult to assess due to system nonlinearity and nosiy measurements. To deal with the problem, we proposed a hierarchical physics-informed neural network (HPINN) to discover the ordinary differential equation (ODE) of a healthy/faulty rotor system from noise measurements and then assess the machine condition based on the discovered ODE. Specifically, the ODE of a healthy rotor system is first stably identified from noise measurement through HPINN guided by rotor dynamics. Based on the identified healthy ODE, the extra fault terms in the ODE of the faulty rotor system are then sparsely regressed from the predefined library embedded in HPINN. Moreover, with the mathematical terms of discovered fault, the potential fault and the health indicator (HI) are diagnosed and constructed to assess the condition of the rotor system, respectively. Finally, the effectiveness of the proposed method is verified by the data set collected on the circulating water test bench, showing the potential for practical applications.

关键词： rotor system fault diagnosis health indicator physics-informed neural network

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RESEARCH ON OPTIMIZATION technology FOR CONTROL PARAMETERS OF EJECTION SEAT BASED ON PSO ALGORITHM 32

RESEARCH ON OPTIMIZATION TECHNOLOGY FOR CONTROL PARAMETERS O...

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32nd Congress of the International Council of the Aeronautical sciences, ICAS 2021

作者： Jin, Lou Wu, Ming Yang, Hui Wu, Liang Cui, Dongyue Overall Technology R and D Department AVIC Aerospace Life-support Industries Ltd. Xianyang441000 China Aviation Key Laboratory of Science and Technology on Life-support Technology Xianyang441000 China Institute of Mechanical and Electrical System AVIC The First Aircraft Institute Xi'an710000 China

ISBN: (纸本)9783932182914

This article studies the optimization simulation method of the multi-modal control parameters of a certain type of ejection seat. According to the working mechanism and optimization goals of the seat, based on the particle swarm optimization algorithm, an optimized simulation program is designed. Using an optimization simulation program written by the Matlab/Simulink platform, the preliminary determination, screening and iterative optimization of control parameters were completed. The optimization results show that by optimizing the multi-modal control parameters, the life-saving performance of the seat is increased by 12.5%, which verifies the effectiveness and feasibility of the optimization algorithm, and provides a theoretical basis for future seat development and modification.. © 2021 32nd Congress of the International Council of the Aeronautical sciences, ICAS 2021. All rights reserved.

关键词： Ejection seats

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Advanced insulating materials contributing to“carbon neutrality”:Opportunities,issues and challenges

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High Voltage 2022年第4期7卷 607-609页

作者： Chuanyang Li Yunlong Zi Yang Cao Giovanni Mazzanti Davide Fabiani Di Zhang Yunqi Xing Jinliang He State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing100084China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayHong Kong SARChina Electrical and Computer Engineering University of Connecticut371 Fairfield WayStorrsCT 06269USA Department Electrical Electronic and Information EngineeringUniversity of BolognaBologna 40136Italy Electrical and Computer Engineering Department Naval Postgraduate School1 University CircleMontereyCA 93943USA State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjin300131China

The vision of 2050 worldwide carbon-neutral ignites a revo-lution in all *** innovations in both electrical power equipment and electrified transportation assets are shaping our future energy *** materials,as the core element of energy infrastructure,are facing unprece-dented challenges that stand in the pathways to global carbon ***,researchers from both academic in-stitutions and industrial sections are working to turn the challenges into opportunities.

关键词： structure. neutral carbon

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Performance Investigation on Rotating Heat Pipes Under High Rotation Speed and Hypergravity

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SSRN 2022年

作者： Yang, Xiaorui Zhang, Penglei Ma, Hui Liu, Kehan Zhang, Dalin Institute of Air Conditioning and Refrigeration College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration AVIC Nanjing Engineering Institute of Aircraft System China

Rotating heat pipe (RHP) is a promising candidate to solve the heat dissipation problem of the aviation electric machine, but it faces two challenges: high speed (up to 50000 rpm) and large hypergravity (more than 10g). At present, the performance of RHP under high speed and hypergravity is not clear, which brings great difficulties to its structure design. In this study, a theoritical model of RHPs was developed, considering mixed convection and hypergravity, allowing to calculate different pipe structures. Subsequently, the heat-transfer performance of three typical RHPs (cylinder, taper, step shapes) were studied comparatively under high rotation speeds (5000~50000 rpm) and large hypergravity (up to 15g). The results showed that:1) the increase of rotation speed will strengthen the natural convection and liquid-return ability, thereby enhancing the heat transfer performance, especially for the step RHP;2) unlike the traditional view, the step RHP operated best when the rotation speed was high due to the liquid storage function of the evaporator;3) hypergravity would reduce the performance of RHP significantly by increasing the liquid film thickness, a taper in the condenser can counter hypergravity effectively due to its strong liquidreturn capacity. Combining the advantages of taper and step heat pipes, an optimal structure was proposed, which can operate safely and efficiently under hyper-gravitational acceleration of 15g when the rotation speed is higher than 10000 rpm. © 2022, The Authors. All rights reserved.

关键词： Structural optimization

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Integrated Model of Aircraft Two-stage Synchronous Starter-Generator Considering Magnetic Saturation

Integrated Model of Aircraft Two-stage Synchronous Starter-G...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Zijie Li Ningfei Jiao Pu Yao Peng He Weiguo Liu Northwestern Polytechnical University Xi'an China Aviation Key Laboratory of Science and Technology on Aerospace Power Systems Xi'an China

The two-stage synchronous starter-generator (TSSG) system is a good candidate for the more-electric aircraft (MEA) integrated starter-generator (ISG) system due to the high reliability and good power generation quality. The accurate model of TSSG is necessary for the detailed analysis and advanced control research. However, separated modeling of brushless exciter (BE) or main machine (MM) cannot reflect the coupling relationship, so it is necessary to establish the integrated model of the TSSG including BE, rotating rectifier and MM. In this paper, two integrated models of TSSG based on double-side Voltage-Behind-Reactance (VBR) and state-space equations, respectively, are proposed considering magnetic saturation, and comparative simulation was carried out to verify these models.

关键词： Analytical models Atmospheric modeling Magnetic separation Rectifiers Mathematical models Magnetic analysis Integrated circuit modeling

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Dynamic Transient power Sharing in Grid-Connected DC Microgrid

Dynamic Transient Power Sharing in Grid-Connected DC Microgr...

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2020 IEEE Sustainable power and Energy Conference, iSPEC 2020

作者： Pokharel, Kabindra Sapkota, Sonee Wang, Yufeng Kang, Zhen Huang, Ming Li, Weilin Wu, Donghua Yan, Ming Fan, Kai Wang, Yi School of Automation Northwestern Polytechnical University Xi'an China Aviation Key Laboratory of Science and Technology on Aerospace Power System Shaanxi Aero Electric Co. Ltd. Xi'an China

ISBN: (纸本)9781728191645

This paper proposes an extended droop control strategy for dynamic transient power-sharing between supercapacitor (SC) and AC grid to manage the power demand in the DC microgrid. The proposed control strategy utilizes a virtual impedance droop structure with the SC converter and a virtual resistor droop structure with the grid rectifier, which are responsible for splitting the load power into transient and average load power, respectively. Load transient caused by a sudden change in the load is buffered by supercapacitor and additional average load power demand is supplied by the grid. The working methods of the proposed control strategy and the design of the system are explained, and theoretical analyses are verified by simulations. © 2020 IEEE.

关键词： Electric power utilization

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