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

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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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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Study on sampling method for performance curve of centrifugal compressor

Study on sampling method for performance curve of centrifuga...

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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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The study and Optimization of noise in a fuel pump

The study and Optimization of noise in a fuel pump

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CSAA/IET International Conference on Aircraft Utility systems

作者： Shiqiu Li Xiaobo Zhang Zhicong Wei Aviation Key Laboratory of Sicience and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems China Agricultural University

ISBN: (纸本)9781510872745

With the continuous advancement of industry technology, fuel pumps are increasingly subject to vibration and noise problems in addition to high speed, high pressurization value, etc. In this paper, the noise of a fuel pump was tested and a design optimization to suppress the noise was proposed. The sound pressure level(SPL) was found exceeding requirements firstly. The numerical analysis model of the pump showed that the main reason of the noise is caused by pressure pulsation between the impeller and the vane. An optimized design of impeller and vane of the pump was proposed. The numerical results show that the pressure pulsation at the blade passing frequency(BPF) is significantly reduced. Finally, the optimized impeller and guide vane were machined and tested. Test result shows that the SPL of the fuel pump drops significantly, meeting the noise requirements. The research findings can serve as a reference for the design optimization of other aviation fuel pumps.

关键词： Fuel pump Numerical simulation Noise Design improvement

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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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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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integration schemes for heat sink of the airborne environmental control and thermal management system

Integration schemes for heat sink of the airborne environmen...

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

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

ISBN: (纸本)9781785617911

As the aeronautical armament is developing to the direction of faster speed, higher stealth and equipped with highenergy weapons, the heat sink design of the airborne environmental control and thermal management system (ECTMS) faces great challenges. Based on practical applications, the integrated design idea and three novel integration schemes that combine the heat release of the ECTMS respectively with the engine inlet, the engine bypass and the fuselage skin are proposed, as well as their detailed structure and manufacturing technology. These integration schemes not only avoid using ram air, but also meet the high demand for huge heat release and ensure the aircraft's overall performance reach the international advanced level. © 2018 IET Conference Publications. All rights reserved.

关键词： Environmental management

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