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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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A High-Frequency GaN-Based Motor Drive for Aircraft Electro-Mechanical Actuators

A High-Frequency GaN-Based Motor Drive for Aircraft Electro-...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Bin Luo Zezhou An Hongming Shen Sihai Li Wenqing Guan Kai Zhou Guagnzhao Luo Xi Xiao Youhua Zeng School of Automation Northwestern Polytechnical University Xi'an China Gansu Key Laboratory of Aeronautical Electro-Mechanical Actuator Northwestern Polytechnical University Lanzhou China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China AVIC Beijing ShuGuang Aviation Electric Co. Ltd Beijing China

Cascade GaN devices extremely attractive for aircraft EMAs application because it has the high switching frequency, low loss and high temperature operating capability. However, owing to complex device structure and high dv/dt and di/dt characteristics, GaN-based motor drive are more prone to current or voltage overshoots and oscillations, even device breakdown. In this paper, a prototype of 5-kW GaN-based motor drive is demonstrated with 100 kHz switching frequency. The mathematical model of turn-ON dv/dt effect and the turn-OFF di/dt effect of cascode GaN based inverter was established to reveal the occurrence mechanism of false trigger and oscillation. Then a systematic design methodology to design the gate driver and snubber parameters is proposed. Finally, experimental are carried out to validate the proposed design methods.

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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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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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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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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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Research on stator structure optimization design of the RVDT

Research on stator structure optimization design of the RVDT

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

作者： Xu, Hua Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China Engineering Institute of Aircraft Systems No 33 Shuige Raod Nanjing China

ISBN: (纸本)9781839535635

Featuring high sensitivity, good linearity and compact structure, rotary variable differential transformer (RVDT) is widely used in automatic control systems in aerospace such as the aircraft nose-wheel steering system, the rudder control system and the inlet control system. In the RVDT design process, both the uniformity of the internal magnetic field and the rationality of structural process shall be addressed to optimize the structural parameters on the precondition of meeting performance requirements. This paper selects a typical RVDT structure as the research subject, and identifies that the selection of the slot width of the stator core is key to improve process rationality and manufacturing efficiency. A structure optimization scheme is put forward by simulation based on different structural parameters and verified by tests. This optimized structure greatly improves the manufacturing efficiency, and the research findings can be applied to the development of redundant RVDT, which provides strong support for accelerating R&D of such products. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Efficiency

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Research on four-vector control system of aero five-phase permanent magnet synchronous motor

Research on four-vector control system of aero five-phase pe...

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

作者： Zhang, Linhai Yao, Yeming Xu, Lilin Nanjing Engineering Institute of Aircraft Systems AVIC Jiangsu Province Nanjing211100 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration

ISBN: (纸本)9781839535635

As More Electric Aircraft technology develops, applications of motors and motor control in the area of aviation increase sharply. Compared with traditional three-phase PMSM, five-phase PMSM features high stability, high power density, low torque ripple and strong fault tolerance and can better meet requirements of high power to weight ratio and high reliability in aviation. In this paper, four-vector control method of five-phase PMSM is studied to present in details steps in realizing such control method which can be converted directly into engineering language. Simulation analysis shows that such method can enable effective control of five-phase PMSM and has some significance of engineering guidance. It has laid foundation for subsequent application of five-phase PMSM in aviation. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Permanent magnets

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Numerical analysis on inducer and impeller combination with different blade wrap angle in aero fuel centrifugal pump

Numerical analysis on inducer and impeller combination with ...

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

作者： Qilong, Tian Xiaobo, Zhang Zongta, Cui Rongxia, Hu Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing211106 China Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing211106 China

ISBN: (纸本)9781839535635

The aero fuel pump is a significant accessory for aircraft fuel system. To enhance the anti-cavitation capability of the pump and reduce hydraulic loss, the paper try to combine the inducer and impeller. Three centrifugal pump combination impellers were designed with different wrap angle. The impact of the wrap angle on the pump hydraulic performance was numerically performed and analyzed by using a computational fluid dynamics code based on the Realizable k-Ε turbulence model, in which the influence of rotation and curvature are considered. The simulation results predicted indicate that the inducer and impeller combination can increase the hydraulic efficiency. In addition, this combination can reduce the inlet flow rate and increase the inlet pressure, enhance the anti-cavitation capability of the centrifugal pump. As the wrap angle increases, the pump pressurization values and efficiency increases first and then decreases. In addition, the maximum hydraulic efficiency point gradually shifts to a smaller flow rate. Therefore, it can be inferred that when the impeller parameters are basically determined, there must be an optimal blade wrap angle. Furthermore, current study new impeller form for further study of design of aero fuel centrifugal pumps. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Cavitation

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