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Adaptive Dead Zone Compensation Control Method for Electro-Hydrostatic Actuators Under Low-Speed Conditions

Chinese Journal of Mechanical Engineering 2024年第6期37卷 199-211页

作者： Haoyi Jiang Zhenfei Ling Fengqi Zhou Maowen Sun Hao Liu Lilin Xu Yeming Yao Xiaoping Ouyang Huayong Yang State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft SystemNanjing 210000China

This study proposes an accurate dead zone compensation control method for electro-hydrostatic actuators(EHAs)under low-speed ***,the nonlinear dead zone characteristics under low-speed conditions are summarized based on numerous EHA *** adaptive compensation function(ACF)is then constructed for the dead ***,this study proposes an adaptive dead zone compensation control method for EHAs by integrating the ACF with a virtual decomposition controller(VDC)based on the established EHA *** stability of the proposed control method is also ***,the proposed control method is verified using an EHA *** test results show that the dead zone trajectory tracking errors of EHAs are significantly reduced when combined with the ***,since most EHAs are controlled by adjusting the motor speed,the method presented in this study is simpler and easier to use than methods that employ flow compensation.

关键词： Electro-hydrostatic actuator Dead zone Compensation Control Low-speed

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THE ANALYSIS OF VALVE MASS FLOW ESTIMATE PARAMETER μ

THE ANALYSIS OF VALVE MASS FLOW ESTIMATE PARAMETER μ

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2024 CSAA/IET International Conference on Aircraft Utility systems, AUS 2024

作者： He, Pengcheng Zhu, Hongtao Tong, Fei Luo, Kun Gou, Ruirui Aviation Key Laboratory' of Science and Technology on Aero Electromechanical System Integration Nanjing China

Valve is important flow control part in the flow tube system, which is defined by the valve plate angle characters, many researches had been done to get valve plate characters by tests and numerical simulations. Function (1) is famous formula to estimate valve characters, such as mass flow, pressure drop, and so on, where μ is a key parameter to calculate. The data of test and simulation of data from reference [4] and reference [9] had dealt by function (2), which had shown that the had some bigger than 1 values, the angle of valve open and the pressure ratio had established ft together. The bigger than 1 values had been gotten by same conditions, which derived from mouth type nozzle inducing injecting. © The Institution of Engineering & technology 2024.

关键词： Nozzles

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The Combined Waves Theory 7th

The Combined Waves Theory

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7th China Aeronautical science and technology Conference, CASTC 2024

作者： He, Pengcheng Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Shuige33 Nanjing China

ISBN: (纸本)9789819797707

The Fourier series method is a basic theory for function transformation, while there are Gibbs effects for such types treatments with finite number of terms. Many mathematicians have contributed the intelligence for this field, such as Hardy [1] and Chen [2], and so on. In this paper, The combined waves theory was proposed, in which the Fourier series have been discussed by Taylor series whose first order function terms shows Gibbs effect naturally, the Gibbs effect may the principle of the word underlying logic, Some basic phenomena had discussed and explained. © Chinese Society of Aeronautics and Astronautics 2025.

关键词： Taylor series

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Theoretical and experimental research on static stiffness,performance,and lift-off characteristics of multi-layer gas foil thrust bearings

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Friction 2024年第11期12卷 2458-2479页

作者： Yang HU Pengjing DING Fangling WU Xiaojing WANG Bo LIANG Yonggang MENG School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200072China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft SystemsNanjing 211106China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

In this study,a new comprehensive fully coupled elastic–hydrodynamic model is developed for a multi-layer gas foil thrust bearing(GFTB).The interaction effects among the top foil,back board,middle foil,and bottom foil,as well as the Coulomb friction effect,are *** stiffness and static characteristics obtained by the experimental and theoretical approaches are in good agreement,which verifies the accuracy of the *** contribution of each foil layer to the overall stiffness and the load-carrying mechanism are *** effects of the load,preload,and rotational speed on the static performance are investigated ***,start–stop tests are performed to achieve the lift-off speed,start-up torque,and shut-down torque under various operating conditions.

关键词： multi-layer gas foil thrust bearing(GFTB) load carrying mechanism static performance

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SIMULATION CALCULATION AND OPTIMIZATION OF AERIAL REFUELING OF AIRCRAFT FUEL system

SIMULATION CALCULATION AND OPTIMIZATION OF AERIAL REFUELING ...

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2024 CSAA/IET International Conference on Aircraft Utility systems, AUS 2024

作者： Wang, Chenchen Wang, Yangyang Gu, Lixin AVIC Nanjing Engineering Institute of Aircraft Systems The Aviation Electromechanical System Integration of Aviation Science and Technology Key Laboratory Nanjing211106 China

In order to ensure that the initial design of the fuel system meets the requirements of aircraft aerial refueling and related standards, a simulation model of an aircraft fuel system was established based on the AMESim simulation platform. The aerial refueling process was calculated under given conditions, and the initial design of the fuel system is optimized based on the calculation results. Results showed that both the initial and optimized fuel systems meet the requirements for refueling time, and the requirements of electrostatic protection for the fuel flow rate inside the pipeline and inlet of the fuel tank during refueling. The optimized fuel system has a more similar refueling rate for each fuel tank and can effectively reduce the weight of fuel system's pipelines. The calculation results can provide guidance for the initial design of fuel system. © The Institution of Engineering & technology 2024.

关键词： Aircraft fuels

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PARTICLE-ELLIPSE IOU LOSS FOR ACCURATE DROGUE DETECTION

PARTICLE-ELLIPSE IOU LOSS FOR ACCURATE DROGUE DETECTION

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2024 CSAA/IET International Conference on Aircraft Utility systems, AUS 2024

作者： Tan, Ke Fan, Jiafei Fan, Boqian Ji, Kang Aviation Key Laboratory of Science and Technology On Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing China

Drogue detection is widely used in autonomous aerial refueling and drogue control, with high accuracy and speed requirements. However, since the image of the drogue is usually an ellipse with different axis ratios, the Intersection over Union (loU) based on rectangular bounding boxes can hardly accurately measure the similarity between the predicted region and the ground truth. To solve the above issue, we propose a novel particle-ellipse loU (PEloU) loss for drogue detection in this work. By setting particles on the image and calculating the proportion occupied by the overlapping part, an estimation of true IoU for two elliptical regions can be obtained. Furthermore, an improved network based on YOLOv8 was designed, and the PEloU loss was integrated into the model. Finally, a drogue dataset was created containing real images, which was used to perform experiments. The extensive experiments demonstrate that the method proposed in this paper not only outperforms the baseline but also operates efficiently in real-time on edge devices. © The Institution of Engineering & technology 2024.

关键词： Image enhancement

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ARCHITECTURE DESIGN AND VERIFICATION OF INERT GAS DISTRIBUTION system

ARCHITECTURE DESIGN AND VERIFICATION OF INERT GAS DISTRIBUTI...

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2024 CSAA/IET International Conference on Aircraft Utility systems, AUS 2024

作者： Wang, Yangyang Wang, Chenchen 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

This study addresses the requirements for tank inerting and proposes application-oriented architectures for inert gas distribution system. Utilizing AMEsim, a multi-tank simulation model is constructed. The accuracy of the model was validated through experimental data,demonstrating its applicability for engineering calculations. Furthermore,the model was utilized to analyze both series and parallel schemes of the distribution system. Results suggest that the series scheme effectively reduces tank oxygen concentration, enhances system reliability and oxygen concentration uniformity, and achieves higher inert gas utilization rates with simplified pipeline arrangements. Consequently, we recommend adopting the series scheme for inert gas distribution system. These findings provide a basis for designing and optimizing inerting system. © The Institution of Engineering & technology 2024.

关键词： Tanks (containers)

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STUDY ON THE PERMEATION MECHANISM OF HOLLOW FIBER MEMBRANES

STUDY ON THE PERMEATION MECHANISM OF HOLLOW FIBER MEMBRANES

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2024 CSAA/IET International Conference on Aircraft Utility systems, AUS 2024

作者： Zhou, Yu Wang, Yangyang 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

After the fiber membrane material is determined, the aircraft is more concerned about the flow rate of nitrogen-rich gas under a certain nitrogen-rich gas (NEA) concentration, thereby determining the inerting time of the fuel tank. This paper mainly introduces the separation principle and related parameters of fiber membranes, as well as the types and separation performance of different fiber membranes. The asymmetric polyimide membrane, which is more commonly used in airborne nitrogen inerting, is used to verify the effects of different temperatures, pressures, and altitudes on the separation efficiency of the fiber membranes through experiments. The results of the research can provide a basis for the design of subsequent high-efficiency hollow fiber membranes. © The Institution of Engineering & technology 2024.

关键词： Nafion membranes

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Measurement of aerodynamic heating of micro-scale rotational shearing flow and its heat flux identification

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Chinese Journal of Aeronautics 2025年第4期38卷 70-90页

作者： Yuan LIU Yuanwei LYU Jingyang ZHANG Chunyang LI Jingzhou ZHANG Zhongwen HUANG College of Astronautics Nanjing University of Aeronautics and AstronauticsNanjing 210016China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Beijing 120016China College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Thermal Management and Energy Utilization of Aircraft Nanjing 210016China

This study conducted the experimental investigation of aerodynamic heating of Micro-scale Rotational Shearing Flow with Axial Limited-Length(MRSFALL).The temperature riseof the stator is captured by the high response *** eccentricity ratio and clearanceheight are guaranteed by means of instantaneous trajectory and torsion monitoring of the *** result shows that the maximum temperature rise takes place upstream of the minimum clear-ance height along circumferential *** distribution of temperature rise presents asymmet-ric curve along axial direction,and peak value occurs near the dimensionless axial position *** effect of aerodynamic heating becomes notable as the rotational speed is larger than3×10^(4)r/*** effect of end leakage and the viscous dissipation have great impact on temper-ature rise of *** specially,the peak value of temperature rise at dimensionless clear-ance height of 0.0080 is larger than the case at dimensionless clearance height of ***,when the eccentricity ratio is too large,the viscous dissipation is induced,and theadditional temperature rise is *** heat flux identification of shear flow has been realizedby Sequential Function Specification Method(SFSM)and its estimation of thermal load has been *** heat flux induced by the aerodynamic heating in this study varies from 950 W/m^(2)to1330 W/m^(2).

关键词： Micro-scale Rotational Shearing Flow with Axial Limited-Length(MRSFALL) Hyper-rotate-speed End leakage Aerodynamic heating experimental measurement Heat flux identification

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PREDICTION METHOD OF COMPRESSIVE STRENGTH AFTER IMPACT FOR FIBER REINFORCED PLASTIC COMPOSITE BASED ON DAMAGE FRACTAL DIMENSION

PREDICTION METHOD OF COMPRESSIVE STRENGTH AFTER IMPACT FOR F...

引用

2024 CSAA/IET International Conference on Aircraft Utility systems, AUS 2024

作者： Jiang, Wen Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing211106 China

The bearing capacity of fiber reinforced plastic (FRP) composite is highly sensitive to low-speed impact damage, making the prediction of compressive strength after impact crucial for their engineering applications. In this study, residual compressive strength tests were conducted on laminates of carbon fiber reinforced plastic (CFRP) 5284RTM/U3160 with three different layups under barely visual inspection damage (BV1D). Prior to compression testing, the impact damage morphology of laminates with different layups was captured using C-scanning, and the impact damage morphology was studied based on fractal dimension. The research results indicate that specimens with higher damage fractal dimensions exhibit lower compressive strength after impact. Based on this, a prediction model for the compressive strength of composite materials after impact was proposed, which is based on the fractal dimension of the impact damage morphology. This method takes the impact damage morphology as an equivalent geometric component - Sierpinski carpet, and obtains the area of laminates no longer participating in load-bearing after damage through the damage fractal dimension, thereby obtaining the residual compressive strength of the laminates. The predicted results of the model match well with experimental results, and it does not require impact energy as an input parameter, making it convenient for engineering applications. © The Institution of Engineering & technology 2024.

关键词： Compression testing

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