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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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The analysis of multi-cylinder synchronization in the load simulation system for reciprocating seals

The analysis of multi-cylinder synchronization in the load s...

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

作者： Guo, Shengrong Zhang, Pengfei Zhou, Qinghe Sun, Dechen Ku, Houtao Peng, Chao Ouyang, Xiaoping Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft System Shuige Road 33 Nanjing211106 China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Zheda Road 38 Hangzhou310027 China

ISBN: (纸本)9781785617911

The load simulation system is a subsystem of the reciprocating sealing test system, to evaluate the working life of the aircraft actuator's sealing components. In this paper, a synchronization controller based on bias coupling is developed to study the control characteristics of the multi-cylinder synchronization under the control of one servo valve. The dynamic model of the load is established and verified by simulations and experiments. The influences of friction, load, and etc. on the synchronization are also analyzed. And the results indicated that synchronization error can be effectively reduced using the controller, besides great cost savings. © 2018 IET Conference Publications. All rights reserved.

关键词： Synchronization

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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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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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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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Numerical simulation of a cabin ventilation subsystem in a space station oriented real-time system

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Chinese Journal of aeronautics 2017年第6期30卷 1809-1817页

作者： Zezheng QIU Liping PANG Guoxiang LI Helin ZHANG School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft SystemsNanjing 211102China

An environment control and life support system（ECLSS） is an important system in a space station. The ECLSS is a typical complex system, and the real-time simulation technology can help to accelerate its research process by using distributed hardware in a loop simulation system. An implicit fixed time step numerical integration method is recommended for a real-time simulation system with time-varying parameters. However, its computational efficiency is too low to satisfy the real-time data interaction, especially for the complex ECLSS system running on a PC cluster. The instability problem of an explicit method strongly limits its application in the ECLSS real-time simulation although it has a high computational efficiency. This paper proposes an improved numerical simulation method to overcome the instability problem based on the explicit Euler method. A temperature and humidity control subsystem（THCS） is firstly established, and its numerical stability is analyzed by using the eigenvalue estimation theory. Furthermore, an adaptive operator is proposed to avoid the potential instability problem. The stability and accuracy of the proposed method are investigated carefully. Simulation results show that this proposed method can provide a good way for some complex time-variant systems to run their real-time simulation on a PC cluster.

关键词： Numerical integration method Real-time simulation Stability THCS Time-variant system

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Analysis and correction of oil leakage of a hydraulic actuator

Analysis and correction of oil leakage of a hydraulic actuat...

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

作者： Bin Liu Qinghe Zhou Bang Li Jiakun Hu Nanjing Engineering Institute of Aircraft Systems Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (纸本)9781510872745

A batch of hydraulic actuators had an oil leakage failure. This paper introduces the sealing structure of oil seepage position and analyzes the reason of failure. After investigation, tests and comparison of the production process of the backup ring with Russian standard of the similar backup ring, we found that the size of the backup ring of the product is unstable. This paper proposes the improved measure. The test and product use demonstrate that the improved measure is effective, and the trouble of failure is eliminated completely.

关键词： Hydraulic actuator Leakage Backup ring

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Design and analysis of a high-speed centrifugal refrigerant compressor

Design and analysis of a high-speed centrifugal refrigerant ...

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

作者： Gang Fan Fei Wang Jun Guo Chengyan Liu Weishi Deng Yunfeng Zhao Aviation Key Laboratory of Science and Technology on Aero Electromechanical system integration Nanjing Engineering Institute of Aircraft Systems Nanjing China

ISBN: (纸本)9781510872745

Compressor is the key equipment of the on-board evaporation cycle system. A complete aerodynamic design method of refrigeration centrifugal compressor is developed in this paper. The method is divided into two parts, which are used to design and analyze separately. Based on the method, a two-stage centrifugal compressor with airfoil diffuser is designed and its performance is predicted. The design rotation rate and pressure ratio are 70000rpm and 4.3 separately. 3D CFD simulation results show that the compressor can meet requirements of the design point of aircraft evaporative refrigeration cycle system.

关键词： aerodynamic design Centrifugal compressor CFD

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Research of key technologies for the more electrical aircraft electric cabin supply air system

Research of key technologies for the more electrical aircraf...

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

作者： Meng Fanxin Gao Zanjun Zheng Wenyuan Hu Wenchao Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems NEIAS Nanjing China

ISBN: (纸本)9781510872745

The features of economy and environmental protection about civil aircraft are introduced. The development direction of airborne electromechanical system is pointed out on more electrical aircraft. The technological advantages and development status of electrical environmental control system are analyzed. The key technologies of electrical cabin supply air system are described, including high pressure ratio compression, centrifugal compressor anti-surge, variable diffuser design, air bearing supporting, large power motor control, high speed rotor cooling, foreign object damage protection, air inlet anti-icing. It is very helpful to provide technical support for environmental control system development for new generation green civil aircraft.

关键词： Electric cabin supply air system Cabin air compressor Electrical environmental control system More electrical aircraft

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Study on load torque disturbance observation and compensation in electromechanical actuator

Study on load torque disturbance observation and compensatio...

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

作者： Xi Xiao Chunqiang Liu Xia Wu Yongqing Wang Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China School of Automation Northwestern Polytechnical University (NPU) Xian China

ISBN: (纸本)9781510872745

Compared with the traditional servo valve controlled hydraulic actuator(SHA), the electromechanical actuator(EMA) has the advantages of simple structure and easy maintenance. Aiming at the load torque ripple caused by the parameter perturbation and the random change of the load in the dynamic control of the electromechanical actuator, the load torque observation method of the electromechanical actuator is carried out. According to the mathematical model of electromechanical actuator, the expression of load torque estimation is deduced, and an online estimation method is designed to observe load torque in operation process and improve torque ripple caused by parameter perturbation.

关键词： electromechanical actuator Load torque observer Sliding mode Online observation

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