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

共 252 条记录，以下是121-130 订阅

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Multi-input Convolutional Neural Network Fault Diagnosis Algorithm Based on the Hydraulic Pump

Multi-input Convolutional Neural Network Fault Diagnosis Alg...

引用

作者： Lishan Zhang Lei Han Yuzhen Meng Wenkui Zhao Beijing University of Posts and Telecommunications Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration

Convolutional neural network used in fault diagnosis can effectively extract fault features in vibration ***,in the feature extraction of mechanical fault diagnosis,usually more than two feature signals including at least axial and radial vibration signals can be *** paper proposes two multi-input convolutional neural network models based on the fault data of the aircraft hydraulic pump including axial and radial *** first is the Independent Input Multi-input Convolutional Neural Network *** two inputs are respectively used for convolution pooling operation with CNN,and are combined through the concatenate function before the fully connected layer,and then all frames are integrated and flattened by the flatten function.A one-dimensional array,finally enters the fully connected layer and outputs the result through the softmax *** second is the Combined Input Multiinput Convolutional Neural Network,that is,combine two one-dimensional signals into a twodimensional signal in the input layer of the convolutional neural network and then perform convolution pooling,and finally output the result through the softmax *** results show that the two models have good accuracy and stability,and the second one has a higher convergence and fitting efficiency than the first one.

关键词： Fault diagnosis Convolutional neural network Multi-input

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Research on 18-pulse autotransformer rectifier device for aviation

Research on 18-pulse autotransformer rectifier device for av...

引用

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

作者： Chen, Wen-Xian Liu, Jing-Yi Yu, Long-Ji AVIC Nanjing Engineering Institute of Aircraft System Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (纸本)9781839535635

In this paper, the scheme of DP type asymmetric 18 pulse boost voltage rectifier autotransformer is adopted to replace the uncontrolled rectifier of the original scheme, reducing the harmonic content of the system and improving the power factor of the system. At the same time, the hardware design and Saber simulation analysis of the whole system are carried out to verify the correctness of theoretical analysis and hardware parameter design. Based on the theory and simulation analysis, a prototype of 3.5kW is developed, and the experimental results are analyzed. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Electric rectifiers

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Propagation Characteristics of Pressure Pulsation in Hydraulic Hose

Propagation Characteristics of Pressure Pulsation in Hydraul...

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作者： Yuzhen Meng Lei Han Wenkui Zhao Lishan Zhang Beijing University of Posts and Telecommunications Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration

Most modern aircraft hydraulic systems use variable plunger *** pulsating flow output is its inherent *** resulting pressure pulsation often causes serious damage to the energy pipeline system and endangers the lives of the *** paper studies the propagation law of hydraulic oil in hydraulic hoses,fully considers the coupling vibration of hydraulic oil high-pressure fluid and flexible solids of the hose,establishes a fluid-solid coupling vibration model of hydraulic hoses,and uses ANSYS for numerical simulation to study different frequencies and pipe *** ANSYS for numerical simulation to study the influence of different frequencies and pipe bending radii on the amplitude of fluid pressure pulsation,after comparative analysis,the law of fluid pressure pulsation propagation in hydraulic hoses is obtained.

关键词： Hydraulic hose Fluid-solid coupling Fluid pressure pulsation propagation

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A Decentralized SoC Balancing Technique for Precharging Series Energy Storage systems 48

A Decentralized SoC Balancing Technique for Precharging Seri...

引用

48th Annual Conference of the IEEE Industrial Electronics Society, IECON 2022

作者： Li, Yao Wu, Donghua Qi, Yang Li, Weilin Northwestern Polytechnical University School of Automation Xi'an China Shaanxi Aero Electric Co. Ltd Aviation Key Laboratory of Science and Technology on Aerospace Power System Xi'an China

ISBN: (数字)9781665480253

ISBN: (纸本)9781665480253

Energy storage systems (ESSs) are widely installed in the present power system. When multiple ESSs are connected in series, proper power sharing is needed to avoid the unbalance SoC issue: some ESSs are not fully charged while others have been overcharged. Due to geographical restriction, there is usually no communication link between different ESSs. In this case, each ESS only knows its local information, such as the state of charge (SoC), output current, and voltage. It is therefore more challenging to achieve the ESS SoC balancing during the pre-charging state. To address this issue, a decentralized SoC balancing control based on complex virtual impedance has been proposed in this paper. The proposed method controls the ESS as a virtual complex impedance, whose impedance angle is correlated with the real-time SoC value. Through this effort, the active power of ESS can be dynamically regulated during the entire pre-charging process to autonomously realize SoC balancing. Finally, hardware-in-loop (HIL) simulation results of a series ESS system are provided for verification. © 2022 IEEE.

关键词： Energy storage

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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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Performance calculation for aircraft electric cabin supply air system

Performance calculation for aircraft electric cabin supply a...

引用

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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A Health Assessment Method of Avionics Equipment 6th

A Health Assessment Method of Avionics Equipment

引用

6th China aeronautical science and technology Conference, CASTC 2023

作者： Huang, Bing Zhou, Jing Cao, Liang Wang, Jinglin Shan, Tianmin Liu, Ying Yao, Xiaohan Luo, Zexi Jiang, Fan Li, Qinyang Aviation Key Laboratory of Science and Technology on Fault Diagnosis and Health Management Shanghai201601 China AVIC United Technology Center for Basic Research on Aircraft System Fault Diagnosis and Health Management Shanghai201601 China AVIC Shanghai Aero Measurement and Controlling Research Institute Shanghai201601 China Company Ltd. Hanzhong723215 China

ISBN: (纸本)9789819988600

With the popularization of aircraft digitization, PHM (prognosis and health management) of avionics equipment is becoming increasingly important. Due to the difficulty in collecting performance parameters for avionics equipment, we propose a new method, which achieves component-level health assessment based on fault risk. In response to the issue of assessment weight dilution in the system, considering the impact of serial and parallel structures on system functionality, an improved health assessment method based on reliability logic was proposed to achieve system-level health assessment. And then, based on the above, we integrated a health assessment algorithm for avionics equipment. Through example Analysis, the methodology proposed in this paper can effectively evaluate the health status of the avionics equipment population. The analytical health calculation method proposed in this article has a fast calculation speed, which is easily deployed onboard health assessment systems and enhances the health management capabilities of avionics equipment. © 2024, Chinese Society of aeronautics and Astronautics.

关键词： Risk assessment

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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...

引用

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...

引用

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

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

引用

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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