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CSAA/IET International Conference on aircraft Utility Systems (AUS 2024)

作者： Liu Leilei Meng Qingtang Chen Wenjie Song Yifan Wang Hao Shanghai Aircraft Design and Research Institute State Key Laboratory of Airliner Integration Technology and Flight Simulation No. 5188 Jin Ke Road Shanghai People's Republic of China Shanghai Aircraft Design and Research Institution No.5188 Jinke Road Shanghai People's Republic of China

ISBN: (数字)9781837242108

This paper has performed an research for the installation relationship of MLG(Main Landing Gear) inner door uplock and roller. The interaction between hook, end stop of uplock and roller of MLG door is analyzed, key factors to stop the roller from moving away from uplock when it’s unlocked have been found. Tests of three cases on Iron Bird have been designed to verify the analysis result. The findings in this paper can be used to instruct the match installation design of MLG door uplock and the roller.

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Numerical And Experimental Investigations On Cavitation Characteristics Of Inducer And Impeller Combination Fuel Pumps

Numerical And Experimental Investigations On Cavitation Char...

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2022 CSAA/IET International Conference on aircraft Utility Systems, AUS 2022

作者： Tian, Qilong Lin, Chengwei Hu, Rongxia Ya, Chen Xu, Sanshu Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing211106 China Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing211106 China The Third Military Representative Office of the Shanghai Bureau of the Air Force Equipment Department in Nanjing Nanjing211106 China

ISBN: (数字)9781839537769

ISBN: (纸本)9781839537769

The aviation fuel pump is a significant accessory for aircraft fuel system. Cavitation resistance is very important for aviation fuel pumps. However, most of the current optimization work for centrifugal pumps only focuses on hydraulic efficiency, which may lead to poor cavitation performance. Therefore, it is necessary to explore effective solutions to improve the cavitation performance of the pump without reducing the efficiency of the pump. To enhance the anti-cavitation capability of the pump and reduce hydraulic loss, the paper try to combine the inducer and impeller. Simulations and external characteristics experiments are carried out. Static pressure and the vapor volume fraction distributions on the inducer and the impeller of the pump under various operation conditions are obtained. At the same time, the curves for the drops of the head coefficients obtained from experiments and calculations are also quantitatively compared, which shows that the numerical simulation of the cavitation performance of the fuel pump is in good agreement with the experimental results. The maximum error of both simulation and experiment is less than 6%, which is within the allowable error range. It indicates that the numerical calculation method adopted can better predict the cavitation performance of the fuel pump. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Cavitation

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Numerical Analysis on the Performance and Axial Force Characteristics of Low Specific Speed and High Head Aviation Fuel Pump

Numerical Analysis on the Performance and Axial Force Charac...

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2022 CSAA/IET International Conference on aircraft Utility Systems, AUS 2022

作者： Han, Zhenrong Tian, Qilong Fan, Hongxing Chen, Ya Cui, Zongtai Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing211106 China Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing211106 China The Third Military Representative Office of the Shanghai Bureau of the Air Force Equipment Department in Nanjing Nanjing211106 China

ISBN: (数字)9781839537769

ISBN: (纸本)9781839537769

The research on the axial force is an important issue for the fuel pump. For the aviation fuel pumps with low specific speed and high head, due to the larger projection area of its impeller cover, and the higher fluid pressure in the pump cavity are more likely to cause an excellent axial force. The performance and axial force characteristics of low specific speed and high head aviation fuel pump was numerically simulated and analyzed. The results of the study showed that the main parts of the fuel pump that generate axial force are the front cover, the rear cover, the impeller and the inducer. The axial force can be reduced by increasing the diameter of the rear cover labyrinth ring and adding the balancing holes. Thus, reducing the loss of the fuel pump and improving the hydraulic efficiency, and the problem of excessively high temperature of the fluid in the pump is solved. This study is helpful to improve the operation stability of fuel pump, and provide reference for subsequent research. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Fuels

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Investigation on heat dissipation characteristics of composite fuel tank skins

Investigation on heat dissipation characteristics of composi...

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CSAA/IET International Conference on aircraft Utility Systems (AUS 2024)

作者： Rongjia Li Jie Liao Gengmin Yuan Dalin Zhang Hao Tang Guangya Zhu AVIC Chengdu Aircraft Design & Research Institute Chengdu People's Republic of China Key Laboratory of Aircraft Environment Control and Life Support Ministry of Industry and Information Technology Nanjing University of Aeronautics & Astronautics Nanjing People's Republic of China

ISBN: (数字)9781837242108

The heat dissipation characteristics of fuel tank skins are critical for fuel thermal management. The overall heat transfer coefficient of the fuel tank skin mainly depends on the heat transfer coefficients inside and outside the bottom plate of the fuel tank, as well as the skin’s thermal conductivity and thickness. In this paper, a three-dimensional model is established based on the fluid-volume method to analyze the heat dissipation characteristics of composite fuel tank skins. The developed model was validated through various experimental tests. The results show that the air-side heat transfer coefficient has a significant effect on the total heat transfer coefficient of the skin, especially when the airplane is at a higher altitude or lower flight speed. The utilization of composite materials for the fuel tank skin reduces the overall heat transfer coefficient, and this reduction is more pronounced as the air-side convective heat transfer coefficient increases and the skin thickness increases. When the remaining fuel level is less than 20%, the overall heat transfer coefficient can increase by as much as 21. 1% compared to that of under full fuel conditions. The insights from this investigation are expected to benefit future fuel tank thermal management.

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Motion and evaporation characteristics of water droplets on different heating surfaces

Motion and evaporation characteristics of water droplets on ...

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CSAA/IET International Conference on aircraft Utility Systems (AUS 2024)

作者： Hao Tang Zhefan Ren Weixue Hu Weijian Chen Dalin Zhang Guangya Zhu Key Laboratory of Aircraft Environment Control and Life Support Ministry of Industry and Information Technology Nanjing University of Aeronautics & Astronautics Nanjing People's Republic of China COMAC Shanghai Aircraft Design & Research Institute Shanghai People's Republic of China

ISBN: (数字)9781837242108

Anti-icing systems are crucial subsystems for ensuring aircraft safety. The movement of water droplets on protective surfaces and evaporation are common phenomena during flight. Understanding water droplets' movement and evaporation characteristics is critical to designing an effective active or passive anti-icing system. Experimental setups were conducted to investigate water droplets' motion characteristics and evaporation performance on heating surfaces with various coatings. The results indicated that the critical diameter for droplet motion was affected by surface hydrophilicity. A water droplet of th e same size could move more readily on hydrophobic surfaces. The results also revealed that the evaporation time of water droplets decreased with increasing surface hydrophilicity. This effect was more pronounced with the droplet size increase, as larger droplets exhibited higher temperature gradients than smaller droplets. The evaporation time of 6 µL water droplets on superhydrophobic coating surfaces was more than 3.5 times longer than that on hydrophilic coating surfaces. The findings of this paper reveal the mechanisms of water droplet motion and evaporation, which can benefit future anti-icing system design.

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Atmospheric occurrences and health risk assessment of polycyclic aromatic hydrocarbons and their derivatives in a typical coking facility and surrounding areas

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Chemosphere 2023年第1期341卷 139994页

作者： Deng, Weiqiang Wen, Meicheng Wang, Chao Huang, Jin Zhang, Shu Ma, Shengtao Xiong, Jukun Wang, Wanjun Zhang, Xin An, Taicheng Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Institute of Environmental Health and Pollution Control Guangdong University of Technology Guangzhou510006 China Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control School of Environmental Science and Engineering Guangdong University of Technology Guangzhou510006 China Institute of Environmental Science Shanxi University Taiyuan030006 China

Coking facilities release large quantities of polycyclic aromatic hydrocarbons (PAHs) and their derivatives into the ambient air. Here we examined the profiles, spatial distributions, and potential sources of atmospheric PAHs and their derivatives in an industrial coking plant and its surrounding environment (gaseous and particulate). The mean concentrations of PAHs, nitrated PAHs (NPAHs), chlorinated PAHs (ClPAHs), and brominated PAHs (BrPAHs) in the air of the coking facility were 923, 23.8, 16.7 and 4.25 ng m−³, respectively, 1–2 orders of magnitude higher than those in the surrounding area and the control area. Linear regressions between contaminant concentrations and distance from the coking facility suggested that the concentrations of PAHs (r2 = 0.82, p 2 = 0.77, p 2 = 0.62, p P) for PAHs and their derivatives and the corresponding subcooled liquid vapor pressures (log PL), the slope values for PAHs, NPAHs, ClPAHs, and BrPAHs ranged from −1 to −0.6, indicating that deposition of PAHs and their derivatives occurred through both adsorption and absorption. Five emissions sources were identified by positive matrix factorization (PMF), including coking emissions, oil pollution, industrial and combustion sources, secondary formation, and traffic emissions, with coking emissions accounting for more than 50% of total emissions. Furthermore, the results of the health risks assessment suggested that atmospheric PAHs and their derivatives in the coke plant and surrounding area negatively impacted human health. © 2023 Elsevier Ltd

关键词： Health risks

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Fault Detection For Dynamic System Based on Generative Adversarial Networks

Fault Detection For Dynamic System Based on Generative Adver...

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第34届中国控制与决策会议

作者： Junpei Yang Wenyou Du Jianguo Cui Zhonghai Li Shenyang Aerospace University School of Automation Key Laboratory of aircraft testing and control technology in Liao Ning

To solve the problem of multivariable time series fault detection,a Long Short Term Memory Generative Adversarial network(LSTM-GAN) model was proposed in this *** contributions are as follows:*** and discriminators were constructed from LSTM Network to capture the dynamic times series related characteristics;*** Generative Adversarial Network was introduced to generate pseudo-samples from a latent space to capture the real data distribution;*** inverter was proposed to map the time series data back to latent space and the status indicator based on reconstruction error was developed for fault detection.A big normal training dataset was obtained using a Simulink version Tennessee Eastman process simulation and experimental results show that the proposed method can capture dynamic characteristics from big data set and reduces the false alarm rate compared with the traditional method,which verifies the feasibility of the proposed method.

关键词： Fault detection Dynamic System Generative Adversarial Networks Long Short Term Memory Network

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Dubins-A*: A New Global Path Planning Scheme for Fixed-Wing UAV with Irregular Obstacles Avoidance

Dubins-A*: A New Global Path Planning Scheme for Fixed-Wing ...

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International Conference on Electronics technology (ICET)

作者： Junyi Xu Mengji Shi Fan Tang Xinyu Sun Jiangfeng Yue Boxian Lin Kaiyu Qin School of Aeronautics and Astronautics University of Electronic Science and Technology of China Chengdu China The Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province Chengdu China National Laboratory on Adaptive Optics Chengdu China

ISBN: (数字)9798350363951

ISBN: (纸本)9798350363968

Path planning for a fixed-wing unmanned aerial vehicles (UAV) in irregular obstacle environments is a complex problem that requires consideration of the kinematic constraints of the UAV, the shape and distribution of obstacles, and the safety and efficiency of flight. With this in mind, this paper presents a new global path planning algorithm Dubins-A * for fixed-wing UAV based on Dubins curves and the A * algorithm. Firstly, an obstacle avoidance path generation algorithm, termed Dubins-avoid which utilizes Dubins curves to navigate around arbitrary polygonal obstacles, is designed. Subsequently, global path planning is executed using the path generated by the Dubins-avoid algorithm in conjunction with the A * algorithm’s search strategy. To enhance robustness, a backtracking mechanism is incorporated to circumvent local minima, alongside an updating node mechanism designed to decrease the number of explored nodes. The effectiveness and superiority of the Dubins$A^{*}$ algorithm are demonstrated through testing in three distinct scenarios.

关键词： Shape Navigation Kinematics Autonomous aerial vehicles Search problems Path planning Robustness

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Adaptive Containment control for Uncertain Networked Agent Systems with Second-Order Dynamics

Adaptive Containment Control for Uncertain Networked Agent S...

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Data Driven control and Learning Systems (DDCLS)

作者： Long You Boxian Lin Jiangfeng Yue Mengji Shi Kaiyu Qin Zili Ren School of Aeronautics and Astronautics University of Electronic Science and Technology of China Chengdu China Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province Chengdu China National Laboratory on Adaptive Optics Chengdu China

ISBN: (数字)9798350361674

ISBN: (纸本)9798350361681

This article proposes a neural network-based adaptive distributed containment controller for second-order integral multi-agent systems with nonlinear dynamics and external disturbances. Firstly, the proposed controller effectively suppresses the effects of nonlinear dynamics and external disturbances while achieving containment control. Secondly, for the adaptive update law of neural networks, unlike existing studies, we simultaneously consider the influence of position error and velocity error on the convergence speed of the weight matrix. Further, two positive definite matrices are constructed to prove the stability of the system based on Lyapunov theory, and the upper bound for the containment errors is provided. Finally, the effectiveness of the proposed method is verified through numerical simulation experiments.

关键词： Learning systems Upper bound Neural networks control systems Numerical simulation Stability analysis Nonlinear dynamical systems

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An improved event-trigger-based robust 6-DOF spacecraft formation control scheme under restricted communication

An improved event-trigger-based robust 6-DOF spacecraft form...

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2022 Chinese Automation Congress, CAC 2022

作者： Liu, Yan Qin, Kaiyu Shi, Mengji Cao, Lu Li, Weihao Lin, Boxian University of Electronic Science and Technology of China School of Aeronautics and Astronautics Chengdu China Aircraft Swarm Intelligent Sensing Cooperative Control Key Laboratory of Sichuan Province Chengdu China Chinese Academy of Military Science National Innovation Institute of Defense Technology Beijing China

ISBN: (纸本)9781665465335

This paper addresses the robust six-degree-of-freedom (6-DOF) formation control problem for groups of spacecraft with constraints that include: restricted communication, unknown external perturbations, model uncertainties, and attitude orbit coupling. First, a Zeno-free trigger function is presented based on the event trigger mechanism to avoid continuous communication and save bandwidth resources;Then, the RBF neural networks are adopted to approximate the model uncertainties and external perturbations of the system;Furthermore, a distributed robust formation controller is designed and the coupling between the event trigger mechanism and neural networks is analyzed, and by designing Lyapunov functions, it is theoretically demonstrated that the formation error of spacecraft can converge to an arbitrarily small residual set. Finally, the simulation experiments are given to validate that the combination of the time-triggered mechanism and neural networks can effectively reduce the number of system controller updates, save communication bandwidth resources and weaken the impact of uncertainties on system stability. © 2022 IEEE.

关键词： Spacecraft

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