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CSAA/IET International Conference on Aircraft utility systems, AUS 2018

作者： Liu, Zheng Dong, Sujun Jiang, Hongsheng Li, Aicheng Meng, Fanxin School of Aeronautic Science and Engineering Beihang University Beijing China Aviation Key Laborary of Science and Technology on Aero Electro Mechanical System Integration Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing China

ISBN: (纸本)9781785617911

Based on the simulation data of performance of centrifugal compressor, this study analyzed the flow rate and efficiency curve of the compressor. By using third-order polynomial fitting method, we compared different results and found that the optimal sampling method was to have 5 lines of rotating speed with 7 different flow rate points in each line, in total 35 sample points, which satisfied the 5% fitting accuracy with minimal sample point and minimal experimental cost. Typical sample points for this optimal method was to set 3 lines of rotating speed and 3 flow rate points to be the maximum (rotating speed) flow rate, minimal (rotating speed) flow rate and the designed (rotating speed) flow rate, respectively. The rest sample points were distributed among those typical sample points. Finally, this sampling method was validated by the experimental results of centrifugal compressor. © 2018 IET Conference Publications. All rights reserved.

关键词： Flow rate

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Two-time Scale Optimized Model Predictive Cascaded Speed and Current Control for PMSM Drives

Two-time Scale Optimized Model Predictive Cascaded Speed and...

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Workshop on Predictive Control of Electrical Drives and Power Electronics (PRECEDE)

作者： Wencong Tu Zhe Chen Peng He Guangzhao Luo Longran Cui School of Automation Northwestern Polytechnical University Xi'an China Key Laboratory of Aviation Science and Technology on Aerospace Power System Shaanxi Aero Electric Co. Ltd Xi'an China

This paper proposes the two-time scale optimized model predictive speed and current control with for permanent magnet synchronous motor (PMSM). The specific sampling time are assigned to the speed control and current control subsystems respectively based on the characteristics of time scale for different subsystems. The prediction sequence of slow-sampling model during asynchronous sampling period remains the holding state in the conventional model predictive process, which weaken the dynamic performance of system. This paper proposes an estimation method by conducting linear function based on the virtual instants to further improve the predictive accuracy at asynchronous sampling instants. Compared to the conventional method, the improvement of proposed strategy is verified in simulation and experiment.

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A study on electromagnet attraction characteristics based on Maxwell

A study on electromagnet attraction characteristics based on...

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CSAA/IET International Conference on Aircraft utility systems (AUS 2018)

作者： Le Yang Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration AVIC NEIAS Nanjing China

ISBN: (纸本)9781510872745

The structure and working principles of airborne electromagnets were introduced and magnetic field analysis and electromagnetic attraction calculation were completed with Maxwell electromagnetic simulation software. By magnetostatic field analysis, the distribution diagrams of magnetic lines of force and magnetic induction intensity were obtained; by electromagnet attraction analysis, the electromagnet attraction was calculated and the impacts of materials, air gap and excitation on electromagnet attraction were examined, thus providing valuable reference for electromagnet optimization.

关键词： Maxwell Electromagnet Magnetostatic field Attraction

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Burst analysis of the aircraft bootstrap reservoir

Burst analysis of the aircraft bootstrap reservoir

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CSAA/IET International Conference on Aircraft utility systems, AUS 2018

作者： Zhang, Heran Yin, Junya Ouyang, Xiaoping Zhang, Pengfei State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Zheda Road 38 Hangzhou310027 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Action Industry Corporation of China Shuige Road 33 Nanjing211106 China

ISBN: (纸本)9781785617911

As a key component of the aircraft hydraulic system, the bootstrap reservoir can guarantee good self-priming of the pump at high rotation speed. This study provides the basic structure Jnd working principle of the bootstrap reservoir. This paper analyzes the causes and characteristics of the reservoir buret. Through the copulation of AMESim and ANSYS workbench, the influence of the hydraulic impact on reservoir burst was observed, and the dangerous part where the bursting occurred was the piston rod. © 2018 IET Conference Publications. All rights reserved.

关键词： Aircraft

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Modeling and simulation of aircraft electrical system based on Dymola

Modeling and simulation of aircraft electrical system based ...

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CSAA/IET International Conference on Aircraft utility systems, AUS 2018

作者： Dong, Run Zhang, Qiaoying Wu, Xiaohua Li, Weilin Wang, Ting Li, Shuxian Duan, Xiaoli Yang, Yang Key Laboratory of Aviation Electnc Propulsion Technology Ministry of Industry and Information Technology of China Department of Electncal Engineering Northwestern Polytechmcal University Xi'an China Key Laboratory of Aviation Science and Technology on Aerospace Power System Shaanxi Aero Electric Co. Ltd Xi'an China

ISBN: (纸本)9781785617911

More-electric aircraft is the inevitable developing trend of future. The electrical system is coupled of different areas subsystems, such as mechanical;electrical, and control etc. Multidomain simulation technology meets the demand of electrical system of the multi-domain integrated modeling. This paper has completed the modeling of multi-electric aircraft electrical system based on Dymola and FMI generalization interface protocol. According to the overall system design requirements, a cosimulation method based on FMI standard protocol interfaces is proposed, which is used to model and simulate typical constant power load. It is verified that the electrical system can be automatically distributed and reorganized under different working conditions. The high reliability design requirement of multi-electric aircraft is guaranteed. This provides important support for the research and design of multi-electric aircraft. © 2018 IET Conference Publications. All rights reserved.

关键词： Electric aircraft

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Research on the flow performance of Airborne flame arrestor

Research on the flow performance of Airborne flame arrestor

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CSAA/IET International Conference on Aircraft utility systems, AUS 2018

作者： Yangyang, Wang Jun, Pan Wenyi, Liu Lu, Wang Fuel System Department Nanjing Engineering Institute of Aircraft Systems AVIC The Aviation Electromechanical System Integration of Aviation Science and Technology Key Laboratory Nanjing China Deparatment of Technology Development Management and IT Nanjing Enginnering Institute of Aircraft Systems AVIC Nanjing China

ISBN: (纸本)9781785617911

Airborne flame arrestor, which can effectively prevent flame propagation and spread so as to earn more evacuating time for passengers and crew, has been widely applied in aircraft ventilation system. In this paper, five main forms of flame arrestor element are discussed and their advantages and disadvantages are analyzed. Flow performance of these elements is calculated. The results show that the flow performance of crimped ribbon, metallic honeycombs and Cellular ceramics types are better than that of parallel plate and perforated sheet. © 2018 IET Conference Publications. All rights reserved.

关键词： Ventilation

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Study on Rotor Eddy Current Losses in High-speed Permanent Magnet Brushless Machines for Aircraft Applications

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IOP Conference Series: Materials science and Engineering 2020年第1期751卷

作者： Yaohua Hu Shushu Zhu Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Nanjing 211106 China Center for More-Electric-Aircraft Power System Nanjing University of Aeronautics and Astronautics Nanjing 211106 China

To improve the power density of aviation electric drive system, the high-speed permanent magnet machines has more and more popular in the air compressor, radial compressor, and electro-hydrostatic actuator applications. Two methods have studied to reduce the rotor eddy current losses in high-speed permanent magnet machines in this paper. Firstly, rotor eddy current losses at different stator slot openings are investigated, the stator core loss are considered simultaneously. Secondly, to reduce the magnet eddy current loss in carbon fiber retaining sleeve, the copper shield is added between permanent and carbon fiber, and the rotor eddy current losses at different copper shield width are studied.

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Performance Comparison Between Ferrite-ASynRM and Interior PM Machine Drives for Traction Applications

Performance Comparison Between Ferrite-ASynRM and Interior P...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Yibo Ge Yaohua Hu Shushu Zhu Aviation Key Laboratory of Science and Technology on Aero Nanjing Engineering Institute of Aircraft Systems Nanjing China Center for More-electric-aircraft Power System Nanjing University of Aeronautics and Astronautics Nanjing China

ISBN: (纸本)9781728133997

This paper compared the electromagnetic performance between ferrite assisted synchronous reluctance machine (Ferrite-ASynRM) and interior permanent magnet (IPM) machine. The electromagnetic performance including the no-load air-gap density, EMF, torque density, torque ripple, iron loss, saliency ratio, and the rate of irreversible demagnetization. The results show that, the advantage of IPM machine is high torque density, low irreversible demagnetization rate and easy manufacturability. The advantage of Ferrite-ASynRM is low torque ripple, lower iron loss and low cost.

关键词： Torque Magnetic flux Air gaps Ferrites Demagnetization Magnetic multilayers Saturation magnetization

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A study on high static friction of steering actuator

A study on high static friction of steering actuator

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CSAA/IET International Conference on Aircraft utility systems, AUS 2018

作者： Xiao, Tian Xu, Xiangrong AVIC Jincheng Nanjing Engineering Institute of Aircraft Systems Dept. name of Organization Key Laboratory of Science and Technology on Aviation Electromechanical System Integration Nanjing Jiangus China

ISBN: (纸本)9781785617911

Aircraft Steering actuators have high static friction phenomena In recent years, which affect the use and lower *** this paper, some control actuator was studied. The factors that affect the static friction of the control actuator were analyzed and feasible solutions for excessive friction of the control actuator were proposed and verified by tests. The research process and conclusion provide valuable reference for the design and troubleshooting of actuator cylinder products. © 2018 IET Conference Publications. All rights reserved.

关键词： Actuators

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Analysis of the Influence of On-Board Temperature and Pressure Control system on Inert Gas Generating Performance of Hollow Fiber Membrane

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IOP Conference Series: Materials science and Engineering 2020年第1期751卷

作者： Jing-yang Zhang Bi-tai Luo Wen-chao Hu Ping Shen College of Astronautics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Aviation Industry Corporation of China Nanjing 211106. China

Based on the typical on-board membrane separation system for fuel inerting, the mathematical models of temperature and pressure control subsystem and hollow fiber membrane were built with the coupled iterative numerical solution methods. While the temperature and pressure were controlled, the design area, nitrogen production effect of hollow fiber membranes were analyzed and compared with the situation of no temperature and pressure control in the full flight envelope by numerical simulation. Moreover, the root causes for those changes were found out. It shows that the method used in temperature and pressure control can increase the bleed air pressure and enhance the stability of temperature and pressure effectively. Compared with the situation of no temperature and pressure control, the temperature and pressure control method are able to decrease the demanded area of membrane by 42.3%~51.7%. And there is no need to adjust the membrane area for condition of low nitrogen production efficiency. But it also decreases the highest nitrogen production efficiency by 9.4% and increase the minimum oxygen concentration by 0.65%. The rate of flow has the most significant effect on nitrogen production. These phenomena are caused by the effects of the rate of flow, pressure, temperature and membrane area.

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