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2022 International Symposium on Aerospace Engineering and Systems, ISAES 2022

作者： Liu, Xin Zhang, Yu Jiang, Dagang Qin, Kaiyu University of Electronic Science and Technology of China School of Astronautics and Aeronautics Sichuan Chengdu China Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province Sichuan Chengdu China

Wireless optical communication technology can provide larger channel capacity for aircraft platforms which has great potentiality. In the application scenario of aircraft platform, the pointing error is inevitable. This study analyzes the fade probability of the link based on Hermite-Gaussian beam by using single-layer phase screen with pointing error simulation method and comparing with Gaussian beam. The higher order Hermite-Gaussian beam shows better link stability performance. Atmosphere turbulence has obvious effect on fade probability when the standard variance of pointing error is small, with the increase of standard variance of pointing error, the major influence factor for fade probability is pointing error rather than atmosphere turbulence. © Published under licence by IOP Publishing Ltd.

关键词： aircraft

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Dynamic Stiffness Analysis and Parameter Optimization of Digital Electro-Hydraulic Actuator 9

Dynamic Stiffness Analysis and Parameter Optimization of Dig...

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9th International Conference on Fluid Power and Mechatronics, FPM 2023

作者： Zhao, Tian-Yu Wu, Shuai Li, Wen-Ding Li, Ren-Jie Wang, Yi Song, Bing Fu, Jun-Yong Jiao, Zong-Xia School of Automation Science and Electrical Engineering Beihang University Beijing China Research Institute for Frontier Science Beihang University Beijing China Ningbo Institute of Technology Beihang University Ningbo China Shanghai Aerospace Control Technology Institute Shanghai China Shanghai Servo-system Engineering Research Center Shanghai China Beihang University Key Laboratory of Advanced Airborne Systems Beijing China Beihang University Science and Technology on Aircraft Control Laboratory Beijing China Tianmushan Laboratory Hangzhou China

ISBN: (数字)9798350304947

ISBN: (纸本)9798350304947

In this paper, the dynamic stiffness characteristics of digital electro-hydraulic actuator are analyzed, and the influence of the introduction of digital valve on the electro-hydraulic actuator is studied. Based on the actual working conditions and requirements of digital electro-hydraulic actuator, the dynamic stiffness models of digital electro-hydraulic actuator and servo valve controlled electro-hydraulic actuator are established respectively. Two testing methods were used to complete closed-loop dynamic stiffness simulation, and the digital valve control system and the servo valve control system are compared and analyzed. By changing different system parameters, the sensitivity analysis of dynamic stiffness parameters of digital electro-hydraulic actuator is realized. Finally, the optimization of system control parameters is realized, and the optimization direction of the system parameters of the digital electro-hydraulic actuator is provided. © 2023 IEEE.

关键词： Stiffness

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Uncertainty Quantification of Store-Separation Simulation Due to Ejector Modeling using a Monte Carlo Approach with Kriging Model

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Advances in Applied Mathematics and Mechanics 2022年第3期14卷 622-651页

作者： Shuling Tian Rongjie Li Jiawei Fu Zihan Jiao Jiangtao Chen Key Laboratory of Unsteady Aerodynamics and Flow Control Ministry of Industry and Information TechnologyNanjing University of Aeronautics and AstronauticsNanjingJiangsu 210016China Shenyang Aircraft Design&Research Institute ShenyangLiaoning 110000China Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle TechnologyBeijing 100076China China Aerodynamics Research and Development Center MianyangSichuan 621000China

Precise calculation of the trajectory of store separation is critical in assess-ing whether the store can be released *** ejection is the initial stage of the releasing process and any uncertainty introduced at this stage will propagate through the whole *** this work,the impact of the uncertainties in ejector modeling on the simulation of a generic store separation is investigated by using a Monte-Carlo-based *** reduce the extremely large computation cost resulted from the direct use CFD in Monte Carlo simulation,the CFD solutions are represented by a time-dependent Kriging model,which is constructed at each time step by using the samples from the URANS *** stochastic outputs,including the distri-bution of probability density function,expected value and 95%conﬁdence interval of store separation trajectory,are obtained by the Monte Carlo *** sensitiv-ity analysis is also carried out by using the Monte-Carlo-based method to determine the most signiﬁcant variables in ejector modeling,which affect the output *** results show that ejector modeling is one of the main uncertainty sources of store separation simulation and the approximation in ejector modeling can cause a signiﬁ-cant deviation,especially in the angular displacement.

关键词： Uncertainty quantification Monte Carlo simulation Kriging surrogate model store separation

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Coverage control in Multiagent Games on Arbitrary Connected Networks

Coverage Control in Multiagent Games on Arbitrary Connected ...

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Asian control Conference

作者： Shaoqing Zhang Pengyang Fan Weiguo Xia Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education School of Control Science and Engineering Dalian University of Technology China Shenyang Aircraft Design and Research Institute Shenyang China

ISBN: (数字)9789887581598

ISBN: (纸本)9798331540845

In this paper, we address the heterogeneous multiagent coverage control problem. While existing algorithms for coverage control are typically designed for specific communication network architectures, there is a notable gap between the available algorithms and the need for developing algorithms suitable for arbitrary connected communication networks. To mitigate this gap, we propose a distributed network adjustment strategy aimed at optimizing network structure to enhance the coverage performance across arbitrary connected communication networks. In terms of the coverage performance, we design a coverage utility function based on network games in dynamic networks and formulate a potential game function, thereby transforming the coverage game problem in dynamic networks into a max-min problem. Additionally, we introduce the Dynamic Network Region Coverage Algorithm to address the coverage game problem in dynamic networks. Finally, we validate the effectiveness of our algorithm through simulation experiments.

关键词： Network topology Heuristic algorithms Games Minimax techniques Numerical simulation Numerical models Communication networks

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Research on a Gain Scheduler of Flight control System to Satisfy aircraft Handling Qualities Assessment

Research on a Gain Scheduler of Flight Control System to Sat...

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Mechanical Engineering and Aerospace Engineering (MEAE), Asia Conference on

作者： Huanyu Wang Wei Guo Chao Zhang State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai China Shanghai Aircraft Design & Research Institute Shanghai Pudong China School of Aerospace Engineering Tsinghua University Beijing China

ISBN: (数字)9798350352252

ISBN: (纸本)9798350352269

In this paper, the control Anticipation Parameter(CAP) and criterion is applied to assess the aircraft handling qualities of the aircraft for category B and C flight phases, which is augmented by Rate Command Attitude Hold (RCAH) gain scheduler. The main contribution of this research is the combination of the gain scheduler technique and handling qualities assessment. In accordance of control Anticipation Parameter(CAP) and C* criteria assessment, the aircraft handling qualities augmented with Rate Command Attitude Hold (RCAH) gain scheduler performs satisfactorily and considerably improved.

关键词： Attitude control Asia Mathematical models Quality assessment aircraft Mechanical engineering Aerospace engineering

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Investigation of the flow boiling characteristic in mini channel with various micro pin fin

Investigation of the flow boiling characteristic in mini cha...

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

作者： Shirui Liu Xiaoya Ding Renjie Jiang Weijian Chen Dalin Zhang Guangya Zhu Yanjun Li 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

Flow boiling in mini-channel is a pivotal technique for airborne vapor compression cycles. This study conducts experimental tests to examine the flow boiling characteristics in mini-channel having four distinct pin fin configurations: diamond, square, circle, and sinusoidal. All channels maintain a uniform hydraulic diameter of 0.67 mm, with only a 2.3% variation in total heat transfer area. The experiments cover a range of operating conditions, including mass fluxes of 150 - 300 kg/(m²·s) and heat fluxes of 10 - 25 kW/m². The results reveal that the pin fin shapes have a significant impact on the pressure drop during flow boiling in mini-channel. Notably, the diamond fins exhibit the least flow resistance. In conditions of identical operation, the pressure drop in channels with square, circular, and sinusoidal fins increases by 303.6%, 120.0%, and 71.6% in meanly, respectively, compared to that of the diamond fins. However, the impact of fins on heat transfer property is less pronounced. Upon analyzing both the pressure drop and heat transfer property, the diamond fins emerge as the superior choice in terms of overall property. The insights gained from this research can inform future optimization efforts for airborne evaporator design.

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Priority Evaluation of Civil aircraft Design Optimization Based on Competitiveness Model

Priority Evaluation of Civil Aircraft Design Optimization Ba...

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Mechanical Engineering and Aerospace Engineering (MEAE), Asia Conference on

作者： Jianyang Zhang Yunpeng Ding State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai Aircraft Design & Research Institute Shanghai China Quality Management Department Shanghai Electro-Mechanical Engineering Institute Shanghai China

ISBN: (数字)9798350352252

ISBN: (纸本)9798350352269

This article proposed and constructed a competitiveness evaluation model based on stakeholder satisfaction as the evaluation criterion for single-aisle passenger aircraft in service. During competitiveness modeling, the analytic hierarchy process method was applied to determine the weights of stakeholders and the attributes they concern. And the attribute parameters were normalized in a sigmoid function to make the evaluation more reasonable. Three pending optimization projects were evaluated and prioritized by the competitiveness model. The drag reduction optimization project which could reduce the direct operating cost without negative impact on aircraft attributes is the most effective way to enhance the overall competitiveness.

关键词： Atmospheric modeling Evaluation models Production aircraft manufacture Stakeholders aircraft aircraft propulsion Mechanical engineering Optimization Design optimization

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Injection performance of micro-injector hot-air anti-icing system

Injection performance of micro-injector hot-air anti-icing s...

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

作者： Tang Haifeng Li Jiayi Zhang Dalin 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

To optimize the micro-injector hot-air anti-icing system, this study designed a model of the micro-injector chamber with five configurations, varying key structural parameters. Numerical simulations using ANSYS Fluent assessed the influence of these parameters on system performance. The variables adjusted included: (1) the gap between the jet hole and the mixing chamber, set between 2mm to 4mm; (2) the height of the corrugated plate channel's outlet, ranging from 4mm to 6mm, with inlet heights between 6mm and 8mm; (3) the mixing chamber length, modified from 42mm to 48mm. Results indicate that increasing mixing chamber length and the jet hole-mixing chamber distance improved injector performance and heat flux density due to better fluid mixing. Smaller inlet height increased injection ratio, however, concurrent reduction in both inlet and outlet heights decreases the injection ratio. Experimental validation was performed using a novel wing anti-icing heat load simulation device on a model configured with an inlet height of 6mm, outlet height of 4mm, a 4mm gap from the jet hole to the mixing chamber, and a 42mm mixing chamber. The experimental outcomes closely aligned with the simulation data, validating the efficacy and accuracy of the simulations in designing micro-injector hot air anti-icing systems.

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Ground maneuver for front-wheel drive aircraft via deep reinforcement learning

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Chinese Journal of Aeronautics 2021年第10期34卷 166-176页

作者： Hao ZHANG Zongxia JIAO Yaoxing SHANG Xiaochao LIU Pengyuan QI Shuai WU School of Automation Science and Electrical Engineering Bcihcmg UniversityBeijing 100083China Research Institute for Frontier Science Beihang UniversityBeijing 1000H3China Science and Technology on Aircraft Control Laboratory Beihang UniversityBeijing 100083China Key Laboratory of Advanced Aircraft Systems(Beihang University) Ministry of Industry and Information TechnologyBeijing 100083China Ningbo Institute of Technology Beihang UniversityNingbo 315800China The State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University.Hangzhou 310027China

The maneuvering time on the ground accounts for 10%–30%of their flight time,and it always exceeds 50%for short-haul aircraft when the ground traffic is *** also contribute significantly to emissions,fuel burn,and noise when taxiing on the ground at *** is an urgent need to reduce aircraft taxiing time on the ***,it is too expensive for airports and aircraft carriers to build and maintain more runways,and it is space-limited to tow the aircraft fast using *** drive capability is currently the best solution for aircraft,which can save the maneuver time for *** idea is proposed that the wheels are driven by APU-powered(auxiliary power unit)motors,APU is working on its efficient point;consequently,the emissions,fuel burn,and noise will be reduced *** Front-wheel drive aircraft,the front wheel must provide longitudinal force to tow the plane forward and lateral force to help the aircraft make a *** traction effects the aircraft’s maximum turning ability,which is difficult to be modeled to guide the controller *** reinforcement learning provides a powerful tool to help us design controllers for black-box models;however,the models of related works are always simplified,fixed,or not easily modified,but that is what we care about *** with complex models can the trained controller be ***-fidelity models that can easily modified are necessary for aircraft ground maneuver controller *** paper focuses on the maneuvering problem of front-wheel drive aircraft,a high-fidelity aircraft taxiing dynamic model is established,including the 6-DOF airframe,landing gears,and nonlinear tire force model.A deep reinforcement learning based controller was designed to improve the maneuver performance of front-wheel drive *** is proved that in some conditions,the DRL based controller outperformed conventional look-ahead controllers.

关键词： Front-wheel drive aircraft Ground maneuver Nose wheel steering Tire model Magic equation Deep reinforcement learning

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Numerical study on flame spread in cabin atmosphere under various overloads

Numerical study on flame spread in cabin atmosphere under va...

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

作者： Zhen Liu Yanjun Li Siying Wang1 Haowen Li 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 aircraft cabin is special confined space with various overloads during motion, whose effect on fires is not clear yet. To understand the fire behaviours at different overloads in cabin atmosphere, numerical simulation was performed on upward flame spread over thin solids by solving the governing equations of both gas and solid phase. The main parameter is the overloads and 0g to 2g was considered. At most overloads, the flame accelerates and grows continuously before extinction while at 0g, flame propagates only with imposed flow. The transient flame positions and spread rates was compared against the overloads and mathematical correlations were proposed. To further understand the effect of overloads on fire behaviours, the local flow speed, solid temperature and heat flux were studied in detail. With the increase of the overloads, the induced flow due to buoyancy increased significantly, which enhanced the oxygen transfer to the flame and heat transfer to the solids. As a consequence, both the gaseous reaction and solid pyrolysis was stimulated, which resulted in longer flame and faster spread rate. The results in this paper revealed that fire safety concern is more serious at high overloads and can contribute to the fire protection design in aircrafts.

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