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2022 CSAA/IET International Conference on Aircraft Utility systems, AUS 2022

作者： Wang, Ruiqi Zhan, Hongbo Ouyang, Jingpeng Gao, Zanjun Yang, Hua Hu, Wenchao Aviation Key Lab. of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (数字)9781839537769

ISBN: (纸本)9781839537769

The heat source of the airborne evaporative cycle system is used to simulate the heat dissipation of electronic equipment, which is the object of the work of the evaporative cycle system. In this paper, an airborne evaporative cycle system is built, and R134a is used as the working medium. The influences of the heat source temperature and flow rate on the system performance are investigated, and an evaporator simulation calculation model is established based on the experimental data. The results show that, with the increase of heat source inlet temperature, the compressor inlet superheat and the heat source outlet temperature increase significantly;with the increase of heat source flow rate, the refrigerant superheat and the heat source outlet temperature increases significantly. The deviation between simulation calculation and test results is less than 6%. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Heat transfer

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Design and Implementation of Magnetic Resonant WPT Charging Area 5th

Design and Implementation of Magnetic Resonant WPT Charging ...

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5th China aviation science and technology Conference, 2021

作者： Chen, Wenxian Qian, Zhenyu Gan, Yuan Aviation Key Laboratory of Science and Technology On Aero-Electromechanical System Integration Nanjing Engineering Institute of Aircraft System Nanjing211106 China

ISBN: (纸本)9789811674228

This paper upgrades the single-excited magnetic resonant WPT system to the multi-excited magnetic resonant WPT power supply area, and proposes a winding connection principle for constructing an omnidirectional power supply area. By changing the winding connection mode of the excitation coil, the magnetic field distribution in the wireless power supply area is changed to form in the enhanced area and weakened area of the magnetic field, the power receiving terminal can improve the degree of energy coupling and power transmission efficiency by changing its degree of freedom in the area. The distribution of the magnetic field under different winding connection modes is analyzed and summarized. In the end, the experimental results of the open resonant wireless charging area platform built by the experiment are consistent with the theoretical analysis and simulation results. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Magnetic fields

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A hybrid piecewise FDD strategy for refrigeration charge fault of airborne vapor-compression cycle system

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INTERNATIONAL JOURNAL OF REFRIGERATION 2022年 135卷 164-173页

作者： Sun, Chengbin Wang, Hexu Jiang, Yanlong Gao, Zanjun Wang, Ju [a]Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics 29 Yudao St. Nanjing 210016 China [b]Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing 211106 China

Many researchers have carried out study on refrigerant charge fault for variable refrigerant flow (VRF) airconditioning system, while few pay attention to refrigerant charge fault for vapor-compression refrigerant cycle system (VCS) of enhanced vapor injection (EVI) with a flash tank onboard. To develop a strategy for refrigerant charge fault of the above system, the optimization methods have been implemented to predict the refrigerant charge level (RCL) based on virtual refrigerant charge (VRC) models. Firstly, Pearson correlation coefficient analysis is employed to obtain the characteristic parameters. Secondly, a piecewise modified VRC model with the different characteristic parameters from VRC models is obtained for two cases of RCL < 75% and RCL > 75%. Meanwhile, combined with the principal component analysis (PCA) and the support vector machine (SVM) algorithm, a PCA-SVM model is developed to improve the prediction accuracy, and the average root mean squared error (RMSE) is only 7.8 compared to 14.9 of the modified VRC model when RCL > 75%, meanwhile, the correctly detected ratio is improved from 62.8% to 84.5%. Then, for solving the difficulty of fault detection and diagnosis (FDD) when RCL > 160%, the moving time window average (MA) algorithm is introduced and an online PCA-MA-SVM model is developed. Finally, a hybrid piecewise FDD strategy combined with three models for refrigeration charge fault in airborne VCS of EVI with a flash tank is obtained.

关键词： Vapor-compression refrigeration cycle system Enhanced vapor injection Refrigerant charge fault Support vector machine Moving time window average

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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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Learning to Update Engine Models with Deep Reinforcement Learning 6

Learning to Update Engine Models with Deep Reinforcement Lea...

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6th International Symposium on Autonomous systems, ISAS 2023

作者： Yu, RuoYan Li, Bei Shi, SuMu Peng, Cong Zhou, YuNan Du, XiangYu Nanjing University of Aeronautics and Astronautics School of Automation Nanjing China Nanjing Engineering Institute of Aircraft Systems Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (纸本)9798350316155

Model updating can reduce the reality gap between the digital space and physical space, which is essential for accurately building digital models of aviation equipment. However, with data requirements and the complexity of application environments continue to increase, traditional update techniques show great limitations. The main reason is that traditional update technologies are limited by computational efficiency, resulting in the inability to balance accuracy and real-time. In this work, we propose a model update method based on reinforcement learning to infer model parameters. The proposed method does not require any ground truth parameters. Experimental results on the twin-rotor turbofan engine model verify the superiority of the proposed method compared with other state-of-the-art methods. © 2023 IEEE.

关键词： Reinforcement learning

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RESEARCH ON AIRCRAFT FUEL TANK MONITORING METHOD BASED ON MACHINE VISION

RESEARCH ON AIRCRAFT FUEL TANK MONITORING METHOD BASED ON MA...

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

作者： Zhu, Hongyu Gao, Shan Xu, Sanshu Nanjing Engineering Institute of Aircraft System AVIC Nanjing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China School of Instrument Science and Opto-Electronics Engineering HFUT Hefei China Nanjing Institute of Tourism and Hospitality Nanjing China

In this paper, a monitoring method based on machine vision is proposed to solve the problems of aircraft fuel measurement and abnormal condition detection in fuel tank. The visual sensor is used to capture and collect the image in the fuel tank, then the solver will identify the current fuel level and fit the fuel surface equation based on the three-dimensional coordinates of points on the fuel level, then calculate the remaining fuel volume. In addition, this method can extract and identify the characteristic of foreign objects and pipeline breakage from the image to determine whether there is an abnormality in the fuel tank. Experiments were designed and validated, and the results of the experiments verified the effectiveness of the method. © The Institution of Engineering & technology 2024.

关键词： Aircraft fuel tanks

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Channel Fading Emulation for Highly Dynamic Communication Scenarios

Channel Fading Emulation for Highly Dynamic Communication Sc...

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2024 IEEE International Conference on Computational Electromagnetics, ICCEM 2024

作者： Fang, Sheng Yang, Ling Ma, Jian Xie, Yuetian Song, Maozhong Song, Lixin Hua, Boyu Zhu, Qiuming Shi, Dan College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing211106 China Aviation Key Laboratory of Science and Technology On Aero Electromechanical System Integration Nanjing211106 China Electronic Science and Technology Beijing University of Posts & Telecommunications Beijing100876 China

ISBN: (纸本)9798350383317

Highly dynamic communication terminals have a crucial role in future communication networks. In this article, a channel emulator is designed and implemented on a Field Programmable Gate Array (FPGA) platform to generate channel fading for highly dynamic communication. To reproduce the fast time-varying channel characteristics, a hardware time-evolution method of channel parameters based on scenario-dependent information is proposed. The measurement results indicate that the proposed channel emulator achieves continuity in the time evolution of channel parameters, and the Doppler power spectral density of the emulated channel match the theoretical results, validating the effectiveness of the emulator. © 2024 IEEE.

关键词： Fading channels

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Simulation Analysis of Electromagnetic Output Force of Linear Motor with Single Magnetic Steel or Dual Magnetic Steel 5

Simulation Analysis of Electromagnetic Output Force of Linea...

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5th World Conference on Mechanical Engineering and Intelligent Manufacturing, WCMEIM 2022

作者： Zhou, Yu-Kun Qiu, Hai-Ling Nanjing Engineering Institute of Aircraft Systems Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Jiangsu Nanjing China

ISBN: (纸本)9781665473699

Taking the dual magnetic steel force motor used in a certain type of direct drive valve as the research object, the corresponding single magnetic steel force motor is derived according to its structure. Due to the similar structure of the single magnetic steel force motor and the dual magnetic steel force motor, the Ansoft electromagnetic simulation software can be used under the same conditions of armature parameters, air gap width, number of coil turns, and parts materials, etc. By analyzing the difference between the output force of single magnetic and dual magnetic force motors, the characteristics of the electromagnetic output force of both are determined. © 2022 IEEE.

关键词： Linear motors

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Double ESO Aided Nonlinear Flux Observer for Sensorless Control of PMSM 27

Double ESO Aided Nonlinear Flux Observer for Sensorless Cont...

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27th International Conference on Electrical Machines and systems, ICEMS 2024

作者： Chen, Zhe Li, Jincheng Zhang, Kun Zhangliu, Mingyuan Zhang, Hang Luo, Guangzhao School of Automation Northwestern Polytechnical University Xi'an China Nanjing Engineering Institute of Aircraft Systems AVIC/Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China School of Electrical Engineering Xi'an University of Technology Xi'an China

ISBN: (纸本)9784886864406

As one promising sensorless control algorithm, the nonlinear flux observer is widely used in industries. However, it is sensitive to parameter variations and the gradient search gain can greatly affect its stability. Therefore, this paper proposes an improved nonlinear flux observer, which corrects the stator flux estimation by adding an extended state observer (ESO) to reduce the parameter sensitivity. In addition, the position error compensation is realized by another ESO constructed in estimated rotation frame. The effectiveness of the proposed algorithm is verified experimentally. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Error compensation

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The analysis of valve mass flow estimate parameterμ

The analysis of valve mass flow estimate parameterμ

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CSAA/IET International Conference on Aircraft Utility systems (AUS 2024)

作者： Pengcheng He Hongtao Zhu Fei Tong Kun Luo Ruirui Gou Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing People's Republic of China

ISBN: (数字)9781837242108

Valve is important flow control part in the flow tube system, which is defined by the valve plate angle characters, many researches had been done to get valve plate characters by tests and numerical simulations. Function (1) is famous formula to estimate valve characters, such as mass flow, pressure drop, and so on, where μis a key parameter to calculate. The data of test and simulation of data from reference [4] and reference [9] had dealt by function (2), which had shown that the μhad some bigger than 1 values, the angle of valve open and the pressure ratio had established μtogether. The bigger than 1 values had been gotten by same conditions, which derived from mouth type nozzle inducing injecting.

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