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International Conference on Electrical Machines and systems (ICEMS)

作者： Shirui Yang Xuefeng Jiang Zhijian Wei Jingyu Zhou Kaiwen Wang Zhenmao Han School of Automation Nanjing University of Science and Technology Nanjing China Aero Electromechanical System Aviation Key Laboratory of Science and Technology Nanjing China

ISBN: (数字)9781665493024

ISBN: (纸本)9781665493031

As the core component of the hydraulic system of the multi electric aircraft, the local energy electric pump determines the performance of the hydraulic servo device. Replace the traditional engine pump source hydraulic system to achieve the purpose of saving cost, improving efficiency, reducing weight and volume. Partial electro-hydraulic energy system refers to the highly integrated pump source system and hydraulic transmission system driven by electricity, which are installed near users in the form of independent components to provide power source for users’ actions. Partial energy electric pump system with Fault-tolerant permanent motor (FTPMM) offers the advantages of high-power density, small volume, small torque ripple and fault-tolerance. In this paper, a winding open circuit fault diagnosis strategy for partial energy electric pump system based on grey prediction theory is proposed. The Grey prediction method only needs to collect less motor current data, uses Grey Model to estimate and predict the change rule of the system, which has the advantages of fast diagnosis speed and high diagnostic accuracy under load mutation. Meanwhile, the misjudgment due to load mutation can be avoided effectively.

关键词： Fault diagnosis Fault tolerance Fault tolerant systems Pumps Hydraulic systems Prediction theory Predictive models

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Performance calculation for aircraft electric cabin supply air system

Performance calculation for aircraft electric cabin supply a...

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CSAA/IET International Conference on Aircraft Utility systems 2020, AUS 2020

作者： Meng, Fanxin Liu, Cheng Lu, Yuliang Cui, Wenjun Yang, Changbao Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Nanjing China

ISBN: (纸本)9781839535635

Electric cabin supply air system of more electric aircraft was introduced to discuss the future developing trend of environmental control system. The system architecture and main component were described to help understanding the system. Mathematical model were established to calculate the performance for external environment, ram air duct, cabin air compressor, add heat valve, check valve and ozone converter. Thermodynamics calculation is carried out for the electric cabin supply air system. According to operational scenario, design parameters of major component are determined and performance are analyzed under cruising, ground and climbing condition. The calculation results show that the component design parameters determined can meet the functional and performance requirements of air conditioning system and can be used as reference for electric cabin supply air system design. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Air conditioning

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Research on control strategy for ground extension and retraction test of landing gear 5

Research on control strategy for ground extension and retrac...

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5th International Conference on Automation, Control and Robotics Engineering, CACRE 2020

作者： Zhang, Linhai Yao, Yeming Xu, Lilin Integration Nanjing Engineering Institute of Aircraft Systems Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Nanjing China

ISBN: (纸本)9781728198880

During take-off and landing of airplanes, landing gear control system features have huge influence on airplane safety. In this paper, Labview software, a virtual instrument from National Instruments Corporation is used as a development platform to apply its powerful G language programming ablity and friendly program design interface to develop system application in order to enable control of landing gear extension and retraction and perform landing gear-related ground tests under laboratory conditions. © 2020 IEEE.

关键词： Application programs

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Optimization of the Structural Parameter in Line-start Permanent Magnet Synchronous Machine for Traction Applications

Optimization of the Structural Parameter in Line-start Perma...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Hui Zou Yaohua Hu Shushu Zhu General management department AVIC Aerospace System CO. LTD Beijing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Nanjing China Center for More-electric-aircraft Power System Nanjing University of Aeronautics and Astronautics Nanjing China

This paper studied the permanent magnet arrangement methods for a 30 kVA line-start permanent magnet synchronous machine for traction applications. By comparing the magnetic flux distribution, no-load starting characteristics, and starting torque of the three structures, the V-shaped structure has the most advantages when all parameters are integrated. At the same time, the selected V-shaped rotor was optimized, such as rotor slot width, slot depth, permanent magnet structure and size. The optimal rotor slot and permanent magnet structure were compared, and the performance of the final machine was analyzed. The simulation results indicate that the machine designed in this paper has the advantages of low starting current and high efficiency.

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Research on aircraft fuel measurement method based on machine vision

Research on aircraft fuel measurement method based on machin...

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CSAA/IET International Conference on Aircraft Utility systems 2020, AUS 2020

作者： Zhu, Hongyu Shao, Yizhou 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

ISBN: (纸本)9781839535635

This paper focuses on the problem of aircraft fuel measurement, a visual measurement method is introduced, which uses the optical camera to collect the fuel level images and calculate the fuel from the image data. Considering the redundant information in the image will reduce the processing speed, a contour extraction method based on HSV color model is proposed to simplify the image. The Convolution Neural Network (CNN) is used to extract the fuel image features, and the fuel prediction model based on Long Short-Term Memory (LSTM) network is constructed. The effectiveness of the visual measurement method is verified by simulation. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Computer vision

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Research on nitrogen enriched air flow of on-board inert gas generating system

Research on nitrogen enriched air flow of on-board inert gas...

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CSAA/IET International Conference on Aircraft Utility systems 2020, AUS 2020

作者： Yangyang, Wang Yu, Zhou Fuel System Department Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing China The Aviation Electromechanical System Integration of Aviation Science and Technology Key Laboratory Nanjing China

ISBN: (纸本)9781839535635

In the design of OBIGGS, the determination of the specific concentration of Nitrogen Enriched Air flow is very important. In this paper, the mathematical model of fuel tank inerting is established, and its correctness is verified by the test data. Then, the NEA flow is calculated under a specific flight envelope, and the influence of flight altitude and inerting time on NEA flow is analyzed. The results show that the inerting time should be greater than 10min in the design of OBIGGS. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Flight envelopes

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A study on gas-liquid two-phase detection technology based on voice coil vibration

A study on gas-liquid two-phase detection technology based o...

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CSAA/IET International Conference on Aircraft Utility systems 2020, AUS 2020

作者： Maokun, Wang Yibo, Ge Lilin, Xu Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing China

ISBN: (纸本)9781839535635

As an indispensable detection technology, Gas-liquid phase detection technology is widely used in sectors such as aviation, petroleum, chemical engineering, energy, etc. The current gas-liquid phase detection methods mainly include mechanical detection, equivalent conductivity detection, photorefractive detection, acoustic wave detection, electromagnetic (optical) wave detection, etc. Each detection method has different characteristics and application scope. In this paper, a technical method for gas-liquid two-phase detection based on voice coil vibration is proposed according to the significant differences in physical properties such as density and viscosity of gas and hydraulic pressure. This paper analyzes the impedance characteristics of the voice coil components, establishes a mathematical model based on the voice coil vibration detection system, conducts principle simulation, and completes the test verification and analysis of the detection method. The gas-liquid two-phase detection method based on voice coil vibration proposed in this paper does not rely on electrical and optical characteristics of the detection object, and has the advantages of high sensitivity and reliability and excellent flexibility. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Viscosity of gases

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GPIO Based Iterative Learning Control for Manipulators with Time-Varying Disturbances

GPIO Based Iterative Learning Control for Manipulators with ...

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Chinese Control Conference (CCC)

作者： Huangyuwei Lu Zuo Wang Jiankun Sun Xi Xiao Shihua Li School of Automation Southeast University Nanjing China Key Laboratory of Measurement and Control of Complex systems of Engineering Ministry of Education Nanjing China Shenzhen Research Institute Southeast University Shenzhen China School of Artificial Intelligence and Automation Huazhong University of Science and Technology Wuhan China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

To improve the disturbance rejection ability and repetitive tracking accuracy of manipulators, a composite iterative learning control (ILC) scheme via generalized proportional integral observer (GPIO) is proposed. A high-order polynomial is first employed to model the time-varying disturbances that include unmodeled dynamics, parameter uncertainties and load fluctuations. A GPIO is then designed to estimate the disturbances and high-order time derivatives. By introducing estimations into a PD-type ILC at each iteration, a composite control scheme is obtained, such that the undesirable influence of time-varying disturbances can be effectively attenuated in the repetitive tracking process of manipulators. In this paper, the rigorous stability analysis of the closed-loop system is presented to guarantee that the tracking error exponentially converges to zero as the iteration number tends to infinity. The effectiveness of the proposed control scheme is finally verified by simulation results.

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Fatigue strength analysis of spring tube of deflector jet servo-valve in random vibration environment

Fatigue strength analysis of spring tube of deflector jet se...

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CSAA/IET International Conference on Aircraft Utility systems 2020, AUS 2020

作者： Zhang, Zhuolei Yuan, Jiayang Ge, Shenghong Aviation Key Laboratory of science and Technology on Aero Electromechanical System Integration Nanjing Mechatronic and Hydraulic Engineering Research Centre Nanjing210061 China

ISBN: (纸本)9781839535635

By introducing the impulsive inertia force, the mathematical model of deflector jet servo-valve affected by acceleration is established in this paper. Based on the mathematical model, through a time domain transformation of the random vibration's PSD (power spectral density) and the dynamic model of servo-valve, we analyze the stress of the spring tube in frequency domain, thus proposing a method for analyzing the spring tube's fatigue strength in random vibration environment. By above methods, a certain type of deflector jet servo-valve is studied by calculating the cyclic stress of stress concentration part of the spring tube in 20g rms random vibration with hydraulic pressure, and the failure cycle is more than 108. Experiment under such condition is also carried out, and no abnormal performances of the servovalve or fracture of spring tubes does occur, which is consistent with the theoretical result. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Vibration analysis

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Performance Investigation on Rotating Heat Pipes Under High Rotation Speed and Hypergravity

SSRN

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SSRN 2022年

作者： Yang, Xiaorui Zhang, Penglei Ma, Hui Liu, Kehan Zhang, Dalin Institute of Air Conditioning and Refrigeration College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration AVIC Nanjing Engineering Institute of Aircraft System China

Rotating heat pipe (RHP) is a promising candidate to solve the heat dissipation problem of the aviation electric machine, but it faces two challenges: high speed (up to 50000 rpm) and large hypergravity (more than 10g). At present, the performance of RHP under high speed and hypergravity is not clear, which brings great difficulties to its structure design. In this study, a theoritical model of RHPs was developed, considering mixed convection and hypergravity, allowing to calculate different pipe structures. Subsequently, the heat-transfer performance of three typical RHPs (cylinder, taper, step shapes) were studied comparatively under high rotation speeds (5000~50000 rpm) and large hypergravity (up to 15g). The results showed that:1) the increase of rotation speed will strengthen the natural convection and liquid-return ability, thereby enhancing the heat transfer performance, especially for the step RHP;2) unlike the traditional view, the step RHP operated best when the rotation speed was high due to the liquid storage function of the evaporator;3) hypergravity would reduce the performance of RHP significantly by increasing the liquid film thickness, a taper in the condenser can counter hypergravity effectively due to its strong liquidreturn capacity. Combining the advantages of taper and step heat pipes, an optimal structure was proposed, which can operate safely and efficiently under hyper-gravitational acceleration of 15g when the rotation speed is higher than 10000 rpm. © 2022, The Authors. All rights reserved.

关键词： Structural optimization

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