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检索条件"机构=Aviation Key Laboratory of Science and Technology on Electromechanical System Integration"

共 219 条记录，以下是211-220 订阅

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Investigation into influence factors of synchronous movement of multi-cylinders

Investigation into influence factors of synchronous movement...

引用

IEEE International Conference on Aircraft Utility systems (AUS)

作者： Chao Hu Pengfei Zhang Xiaoping Ouyang Houtao Ku Qinghe Zhou Enxiao Zhang State Key Lab. of Fluid Power Transmission and Control Zhejiang University Hangzhou China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China The High School Attached to Zhejiang University Hangzhou China

ISBN: (纸本)9781509010882

Seal is one of the most important characteristics for cylinders and suitable seal configuration will guarantee the long life cycle of the seal and the cylinder. Experiment is the only way which can demonstrate the best seal configuration in applications. In this paper, one approach is brought forward for testing the seal performance of cylinders with different seals configurations at the same load working condition for saving the test time. In the test-rig, the synchronization of cylinders is one of the key technologies. The test system is modelled in the AMESim software. The effect caused by the changes of the different physical parameters is analyzed, such as load stiffness, viscous damping coefficient of cylinder, dead volume of cylinder and internal leakage coefficient. The experiment is carried out and test results agree with the simulation results. Finally, the appropriate solution is proposed for improving the synchronization of the multi-cylinders further.

关键词： Synchronization Valves Seals Damping Load modeling Springs Servomotors

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Investigation into Influence Factors of synchronous movement of Multi-cylinders

Investigation into Influence Factors of synchronous movement...

引用

2016 IEEE/CSAA International Conference on Aircraft Utility systems(AUS)

作者： Chao Hu Pengfei Zhang Xiaoping Ouyang Houtao Ku Qinghe Zhou Enxiao Zhang State Key Lab.of Fluid Power Transmission and Control Zhejiang University Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration State Key Lab.of Fluid Power Transmission and Control Zhejiang Univ. The High School Attached to Zhejiang University

Seal is one of the most important characteristics for cylinders and suitable seal configuration will guarantee the long life cycle of the seal and the *** is the only way which can demonstrate the best seal configuration in *** this paper,one approach is brought forward for testing the seal performance of cylinders with different seals configurations at the same load working condition for saving the test *** the test-rig,the synchronization of cylinders is one of the key *** test system is modelled in the AMESim *** effect caused by the changes of the different physical parameters is analyzed,such as load stiffness,viscous damping coefficient of cylinder,dead volume of cylinder and internal leakage *** experiment is carried out and test results agree with the simulation ***,the appropriate solution is proposed for improving the synchronization of the multi-cylinders further.

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Modelling and Simulation of a Novel Dual-Redundancy Electro-Hydrostatic Actuator

Modelling and Simulation of a Novel Dual-Redundancy Electro-...

引用

2015 International Conference on Fluid Power and Mechatronics

作者： Haitao QI Yating TENG Zilong LIU Xi XIAO Tigao LEI Engineering Training Center Beihang University School of Mechanical Engineering and Automation Beihang University Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems

The proposed paper deals with the problem of modelling and simulation of a dual-redundancy ElectroHydrostatic Actuator(DREHA) by the way of co-simulation based on AMESim and MATLAB. With the development of More Electric Aircraft(MEA) technology, integrated Power-byWire(PBW) actuator will be used in the airborne actuation system. As an important PBW actuation system, EHA has virtues of high efficiency, little heat generation, easy structure integration design, effortless parallel redundancy design, convenient power distribution and management, few installation restriction, control-configured layout, and expediently implementing lock and isolation, which are more suitable to the actual technology development level and airborne requirements. The research of DREHA has a vital significance to improve the reliability of its use in aircraft. The schematic of a novel DREHA are firstly given based on the existing fault tolerant EHA architectures, and its principle is analyzed in detail. Then, build the model of control and motor part in MATLAB, and the model of hydraulic part in AMESim. Analyze the operating modes of DREHA, including active/active and active/passive mode. Finally, co-simulate the dynamic response and operating modes of DREHA based on AMESim and MATLAB. The simulation results show that this new DREHA has the ability of no performance degradation after the first failure and safe after the second failure.

关键词： Electro-Hydrostatic Actuator dual-redundancy modelling simulation

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Temperature control of permanent-magnet synchronous motor using phase change material

Temperature control of permanent-magnet synchronous motor us...

引用

IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： Shengnan Wang Yun-Ze Li Yang Liu Hang Zhou Yunhua Li Wei Guo Xi Xiao School of Automation Science and Electrical Engineering Beihang University Beijing China School of Aeronautics Science and Engineering Beihang University Beijing China Aviation key laboratory of science and technology on aero electromechanical system integration China aviation industry Jincheng Nanjing electrical and hydraulic engineering research center Nanjing China

ISBN: (纸本)9781467391085

This paper presents a design of a permanent-magnet synchronous motor (PMSM) casing with organic phase change material (PCM), paraffin, stuffing to absorb and store the heat produced by the motor so as to prevent the motor temperature from sharp increase or decrease, and more important to avoid the motor from overheating. The paraffin is filled in the hollow motor casing on which some cavities are made specially and no complicated water-cooling or fan units are needed for the motor cooling. Mathematical models are established. Temperature variation curves of motor casings with different structure parameters and different types of paraffin are simulated on several motor operating duty cycles to observe the temperature control effectiveness of this method. Results demonstrate that the temperature of the casing could be controlled around a certain value depending on the melting temperature of the sufficient paraffin filled in the casing whose re-solidification time should be long enough in every operating period of the motor. Thus, the temperature-rise of the PMSM with paraffin casing can be controlled into a smaller range (around 55K if the melting temperature of the paraffin is 353.15K with the initial value of 298.15K) compared with that of the same size casing without paraffin (ranged from 41.491K to 71.346K). At the same time, the continuous operating time of the PMSM can be extended much longer with a PCM filled casing.

关键词： Heating Phase change materials Synchronous motors Mathematical model Transient analysis Induction motors

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Modelling and simulation of a novel dual-redundancy electro-hydrostatic actuator

Modelling and simulation of a novel dual-redundancy electro-...

引用

International Conference on Fluid Power and Mechatronics (FPM)

作者： Haitao Qi Yating Teng Zilong Liu Xi Xiao Tigao Lei Engineering Training Center Beihang University Beijing China School of Mechanical Engineering and Automation Beihang University Beijing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Nanjing China

ISBN: (纸本)9781479987719

The proposed paper deals with the problem of modelling and simulation of a dual-redundancy Electro-Hydrostatic Actuator (DREHA) by the way of co-simulation based on AMESim and MATLAB. With the development of More Electric Aircraft (MEA) technology, integrated Power-by-Wire (PBW) actuator will be used in the airborne actuation system. As an important PBW actuation system, EHA has virtues of high efficiency, little heat generation, easy structure integration design, effortless parallel redundancy design, convenient power distribution and management, few installation restriction, control-configured layout, and expediently implementing lock and isolation, which are more suitable to the actual technology development level and airborne requirements. The research of DREHA has a vital significance to improve the reliability of its use in aircraft. The schematic of a novel DREHA are firstly given based on the existing fault tolerant EHA architectures, and its principle is analyzed in detail. Then, build the model of control and motor part in MATLAB, and the model of hydraulic part in AMESim. Analyze the operating modes of DREHA, including active/active and active/passive mode. Finally, co-simulate the dynamic response and operating modes of DREHA based on AMESim and MATLAB. The simulation results show that this new DREHA has the ability of no performance degradation after the first failure and safe after the second failure.

关键词： Mathematical model Valves Switches MATLAB Actuators Integrated circuit modeling

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Experimental study on impact of installation angle on heat transfer performance of spray cooling

Experimental study on impact of installation angle on heat t...

引用

2014 International Conference on Logistics Engineering, Management and Computer science, LEMCS 2014

作者： Pang, Liping Jin, Shicheng Yu, Zhang Liu, Zhixuan Ji, Yibin School of Aviation Science and Engineering Beijing University of Aeronautics and Astronautics Beijing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (纸本)9789462520103

The spray cooling technology has great advantage in high heat flux removal. Because the heat transfer of spray cooling has much to do with the heater surface temperature, it is important to ensure that the entire heating surface temperature is in an effective operating range. Otherwise, excessive local temperature may threaten the normal operation of spray cooling. In this paper, experimental method was used to investigate the effect of installation angle of spray cooling on the heat transfer performance. The five installation angles tested in this study were 0°, 45°, 90°, 135° and 180°. Other experimental parameters remain constant, such as the flow rate, the spray height and the spray pressure. The results show the heat flux as a function of surface temperature with various installation angles in a graphical format. © 2014. The authors - Published by Atlantis Press.

关键词： Atmospheric temperature

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Investigation of spray cooling performance on different heat transfer surfaces

Investigation of spray cooling performance on different heat...

引用

2014 International Conference on Logistics Engineering, Management and Computer science, LEMCS 2014

作者： Jin, Shicheng Zhang, Yu Ji, Yibin Pang, Liping Yu, Wenxuan School of Aviation Science and Engineering Beijing University of Aeronautics and Astronautics Beijing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Nanjing China

ISBN: (纸本)9789462520103

With the rapid development of laser technology and high integrated circuit technology in the field of aerospace, the equipment thermal dissipation is increasing sharply. The traditional thermal control methods such as air natural convection, forced convection and heat pipe cooling cannot meet the demand of high heat flux rejection. Additionally, high heat flux cooling techniques are more difficult to apply to airborne weapons and electronic devices. Consequently, a new efficient cooling technology is urgently required for their thermal management. Because of the advantages such as reduced coolant flow rate, no delay boiling, low temperature difference between the working fluid and the heated surface, and high heat flux removal capability, spray cooling has been one of the most attractive method to solve the high power dissipation problem. For the special requirements of airborne laser weapons and high power electronics, experimental studies were conducted to investigate the heat transfer performance of spray cooling on different heated surfaces. © 2014. The authors - Published by Atlantis Press.

关键词： Electronic cooling

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Prediction of ice shape for three-dimensional engine inlet based on the proper orthogonal decomposition method

Prediction of ice shape for three-dimensional engine inlet b...

引用

2nd International Conference on Advances in Energy and Environmental science, ICAEES 2014

作者： Shen, Xiao Bin Mu, Zuo Dong Lin, Gui Ping Zhou, Yue School of Aeronautic Science and Enginnering Beihang University Beijing China Aviation key laboratory of science and technology on aero electromechanical system integration Nanjing Engineering Institute of Aircraft Systms Nanjing China

ISBN: (纸本)9783038352082

To increase the prediction speed of ice accretion on the 3D engine inlet, the Proper Orthogonal Decomposition (POD) method was introduced. Taking the ice shapes from CFD numerical calculation results as samples, in view of the change of icing temperature, the procedures of predicting the ice shapes by POD method were introduced, which used ice shapes' coordinates and ice accretion height as compute parameters, respectively. The POD and CFD ice shapes were found coincident, which indicates that the POD method can fast and accurately calculate the 3D engine inlet ice shapes. The results from the two different POD parameters were shown and compared, and the ice shapes were nearly the same, which means they have the same effect. However, the POD method based on ice accretion height is simpler and more appropriate. © (2014) Trans Tech Publications, Switzerland.

关键词： Ice

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Research on integration of vapor cycle/liquid-cooled refrigeration system for helicopters 29

Research on integration of vapor cycle/liquid-cooled refrige...

引用

29th Congress of the International Council of the Aeronautical sciences, ICAS 2014

作者： Liang, Hu ECS Department AVIC/ Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems PO Box 19 Nanjing Jiangsu Province211106 China

ISBN: (纸本)3932182804

Some proposal has been researched on the integration of vapor cycle/liquid-cooled refrigeration system for helicopters. According to mathematic models of system components, the simulation model of this system has been established, heat loads of vapor cycle refrigeration system and lubricant oil system have been removed by the heat sink of fuel and liquid-cooled approaches. The system simulation based on MATLAB/SIMULINK general simulation platform is valuable and significant for integrated system optimization as well as design of system components.

关键词： Refrigeration

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