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2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Wang, Ximei COMAC Shanghai Aircraft Design&Research Institute Shanghai China State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai200126 China

By verifying the physical properties of composite materials in aircraft parts, it offers technical support and guarantee for the material selection of various parts of the aircraft and mitigates the significant influence of various uncertainties on the judgment of test results. In this paper, three typical composite materials are subjected to impact tests, and the uncertainty of the impact performance of three types of aircraft metal structures in low-energy impact tests is quantitatively analyzed. The causes of uncertainty are examined, and measures are formulated to effectively reduce the impact of uncertainty factors on the test results. © The Institution of Engineering & technology 2024.

关键词： Aluminum alloys

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INFLUENCE OF control COMPONENTS ON THE OPEN-LOOP CHARACTERISTICS OF AIRBORNE EVAPORATIVE CYCLE SYSTEM

INFLUENCE OF CONTROL COMPONENTS ON THE OPEN-LOOP CHARACTERIS...

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2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Wang, Ruiqi Zhan, Hongbo Ouyang, Jingpeng Gao, Zanjun Yang, Hua Hu, Wenchao Nanjing Engineering Institute of Aircraft Systems AVIC Jincheng Nanjing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

In this paper, an airborne evaporative cycle system is built, and R1234ze is used as the working medium. To explore the open-loop behavior of an airborne evaporative cycle system, we examined how adjusting the compressor speed and electronic expansion valve opening affects the compressor inlet superheat, heat source outlet temperature, and refrigeration capacity. The test results indicate that, in the specified testing conditions, the impact of compressor speed and electronic expansion valve opening on system performance is evident. As compressor speed increases, there is a significant rise in compressor inlet superheat, a notable decrease in heat source outlet temperature, and a substantial increase in refrigeration capacity. Conversely, an increase in electronic expansion valve opening leads to a significant reduction in compressor inlet superheat. © The Institution of Engineering & technology 2024.

关键词： Compressors

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Research on the cabin pressure control system based on the gray wolf fuzzy PID algorithm 2

Research on the cabin pressure control system based on the g...

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2023 2nd International Conference on Aerospace and control Engineering, ICoACE 2023

作者： Wang, Shun Meng, Fanxing Yang, Yonghui Yang, Changbao Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing211106 China Nanjing Engineering Institute of Aircraft Systems Nanjing211106 China

The cabin pressure control system is typically nonaffine-nonlinear time-varying system. In this paper, the fuzzy PID control method optimized by gray wolf algorithm is proposed to solve the problems of large overshoot and long adjustment times in traditional control methods. Simulation results show that the fuzzy PID control method optimized by gray wolf algorithm proposed in this paper improves the dynamic characteristics of the system, reduces cabin pressure error and adjustment time, stabilizes the control process, and improves the comfortableness of passengers. © Published under licence by IOP Publishing Ltd.

关键词： Three term control systems

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Study on Automatic Takeoff Thrust control System of Civil aircraft

Study on Automatic Takeoff Thrust Control System of Civil Ai...

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2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Zhang, Tianwei Jin, Jiangchen Zhu, Jianjun Shu, Jiayi Zhao, Qiang COMAC Shanghai Aircraft Design & Research Institute Shanghai201210 China State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai200126 China

The automatic takeoff thrust control system (ATTCS) can reduce the takeoff thrust during normal takeoff, which is beneficial for operation economy. On the other hand, ATTCS will increase the complexity of aircraft takeoff thrust control. ATTCS will affect the engine thrust scheme, performance, community noise, engine emission and other aspects of the aircraft, so it is necessary to conduct comprehensive trade-off studies. A comprehensive analysis of the impact and design keypoint of ATTCS is proposed in this paper, which can help civil aircraft manufacturer conduct ATTCS trade-offs and scheme design. © The Institution of Engineering & technology 2024.

关键词： aircraft control

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An aircraft brake control algorithm with torque compensation based on RBF neural network

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Chinese Journal of Aeronautics 2024年第1期37卷 438-450页

作者： Ning BAI Xiaochao LIU Juefei LI Zhuangzhuang WANG Pengyuan QI Yaoxing SHANG Zongxia JIAO School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China Science and Technology on Aircraft Control Laboratory Beihang UniversityBeijing 100191China Key Laboratory of Advanced Aircraft Systems(Beihang University) Ministry of Industry and Information TechnologyBeijing 100091China Research Institute for Frontier Science Beihang UniversityBeijing 100191China Ningbo Institute of Technology of Beihang University Ningbo 315800China Tianmushan Laboratory Xixi Octagon CityYuhang DistrictHangzhou 310023China

The wheel brake system of an aircraft is the key to ensure its safe landing and rejected takeoff.A wheel’s slip state is determined by the brake torque and ground adhesion torque,both of which have a large degree of *** is this nature that brings upon the challenge of obtaining high deceleration rate for aircraft brake *** overcome the disturbances caused by the above uncertainties,a braking control law is designed,which consists of two parts:runway surface recognition and wheel’s slip state *** runway surface recognition,the identification rules balancing safety and braking efficiency are defined,and the actual identification process is realized through recursive least square method with forgetting *** slip state tracking,the LuGre model with parameter adaptation and a brake torque compensation method based on RBF neural network are proposed,and their convergence are *** effectiveness of our control law is verified through simulation and ground *** in the experiments on the ground inertial test bench,compared to the improved pressure-biased-modulation(PBM)anti-skid algorithm,fewer wheel slips occur,and the average deceleration rate is increased by 5.78%,which makes it a control strategy with potential for engineering applications.

关键词： aircraft landing Brakes Disturbance observer Neural networks Runway identification

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RESEARCH ON FAULT FACTORS OF ENGINEERING SIMULATORS BASED ON QUOTIENT SPACE THEORY

RESEARCH ON FAULT FACTORS OF ENGINEERING SIMULATORS BASED ON...

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2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Wang, Ximei COMAC Shanghai Aircraft Design&Research Institute Shanghai China State Key Laboratory ofAirliner Integration Technology and Flight Simulation Shanghai200126 China

Engineering simulators are important testing equipment that runs through various stages of aircraft system development. In order to improve the efficiency of aircraft development, ensure the production safety of engineering simulators, reduce operating costs, and better apply them to aircraft systems, this article analyzes the four main sources of faults in engineering simulators: the possibility of human factors, equipment factors, environmental factors, and management factors;Combining the quotient space theory, construct an quotient space model for the uncertainty of engineering simulator failures;Then calculate the similarity matrix, quantitatively analyze the similarity between each element, and establish a hierarchical structure of the factors that may cause faults in the engineering simulator. Research has shown that quantitative analysis of the possibility of faults in engineering simulators can effectively optimize management measures and methods, and improve the management level of engineering simulators. © The Institution of Engineering & technology 2024.

关键词： Cost engineering

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Novel Ag-bridged dual Z-scheme g-C_(3)N_(4)/BiOI/AgI plasmonic heterojunction: Exceptional photocatalytic activity towards tetracycline and the mechanism insight

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Journal of Environmental Sciences 2023年第9期131卷 123-140页

作者： Wenxia Wang Zhen Li Kailin Wu Guodong Dai Qingping Chen Lihua Zhou Junxia Zheng Liang Ma Guiying Li Wanjun Wang Taicheng An School of Biomedical and Pharmaceutical Sciences Guangdong University of TechnologyGuangzhou 510006China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and HealthInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Guangzhou Key lab of Clean Transport Energy and Chemistry Guangdong University of TechnologyGuangzhou 510006China Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control Guangdong Technology Research Center for Photocatalytic Technology Integration and Equipment EngineeringSchool of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China

Rational design and synthesis of highly efficient and robust photocatalysts with positive exciton splitting and interfacial charge transfer for environmental applications is ***,aiming at overcoming the common shortcomings of traditional photocatalysts such as weak photoresponsivity,rapid combination of photo-generated carriers and unstable structure,a novel Ag-bridged dual Z-scheme g-C_(3)N_(4)/BiOI/AgI plasmonic heterojunction was successfully synthesized using a facile *** showed that Ag-AgI nanoparticles and three-dimensional(3D)BiOI microspheres were decorated highly uniformly on the 3D porous g-C_(3)N_(4) nanosheet,resulting in a higher specific surface area and abundant active *** optimized 3D porous dual Z-scheme g-C_(3)N_(4)/BiOI/Ag-AgI manifested exceptional photocatalytic degradation efficiency of tetracycline(TC)in water with approximately 91.8%degradation efficiency within 165 min,outperforming majority of the reported g-C_(3)N_(4)-based ***,g-C_(3)N_(4)/BiOI/Ag-AgI exhibited good stability in terms of activity and ***-depth radical scavenging and electron paramagnetic resonance(EPR)analyses confirmed the relative contributions of various *** analysis indicated that the improved photocatalytic performance and stability were ascribed to the highly ordered 3D porous framework,fast electron transfer of dual Z-scheme heterojunction,desirable photocatalytic performance of BiOI/AgI and synergistic effect of Ag ***,the 3D porous Z-scheme g-C_(3)N_(4)/BiOI/Ag-AgI heterojunction had a good prospect for applications in water *** current work provides new insight and useful guidance for designing novel structural photocatalysts for environment-related applications.

关键词： Three-dimensional Porous heterostructure Graphitic carbon nitride(g-C_(3)N_(4)) Dual Z-scheme heterojunction Tetracycline(TC)degradation Mechanism insight

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DESIGN OF THE MAGNETIC CIRCUIT COMPENSATION TYPE OF LARGE ANGLE MEASUREMENT OF RVDT

DESIGN OF THE MAGNETIC CIRCUIT COMPENSATION TYPE OF LARGE AN...

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2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Wang, Hongchao Jiang, Hongyan Mao, Shijie Wang, Yin Han, Chao Zhao, Yuqing Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems AVIC Jincheng Jiangsu Nanjing211106 China

In order to meet the need of large angle measurement of actuating system, the miniaturization and dexterity is taken as the design idea. By redesigning the structure of rotor core and stator coil, the measuring angle is expanded without increasing the number of components, the volume and weight of RVDT. In addition, in order to improve the linearity of induced voltage of RVDT, the method of magnetic circuit compensation is adopted. When making the rotor core, tilting its side, the total magnetic flux of RVDT is stable when the rotor core rotates at any angle. By using theoretical analysis, simulation experiment and prototype test, the design of magnetic circuit compensation type of large angle measurement of RVDT is verified. © The Institution of Engineering & technology 2024.

关键词： Angle measurement

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RESEARCH ON AUTO-TUNING OF control PARAMETERS FOR AVIATION ELECTROHYDROSTATIC ACTUATOR BASED ON INTELLIGENT ALGORITHM OPTIMIZATION

RESEARCH ON AUTO-TUNING OF CONTROL PARAMETERS FOR AVIATION E...

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2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Chen, Yuxi Chen, Lijun Yao, Yeming Wang, Xiaoping Chang, Cheng Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China Nanjing Engineering Institute of Aircraft Systems Jincheng Corporation AVIC Nanjing China

This paper takes the Aviation Electro-hydrostatic Actuator (EHA) as the research object, analyses its working principle and structural characteristics, establishes mathematical models for the drive motor, pump and cylinder, and builds a simulation model based on MATLAB/Simulink. Addressing the issues of strong nonlinearity, cumbersome manual tuning of PI parameters under strong disturbances, and poor control effects in the EHA systems, this paper proposes an auto-tuning method for PI control parameters based on improved Bayesian optimization. A comparative analysis is conducted with traditional manual tuning methods and RF methods. According to simulation comparison results, the proposed method outperforms traditional tuning methods in terms of robustness and rapidity. © The Institution of Engineering & technology 2024.

关键词： MATLAB

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Exploration of the design method of fuel pump parts structure optimization

Exploration of the design method of fuel pump parts structur...

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2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Zongtai, Cui Xun, Shen Xian, GuJing Yang, Yang Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing211106 China Nanjing Engineering Institute of Aircraft Systems AVIC Nanjing211106 China

With the continuous improvement of performance requirements for aircraft combat, transportation, and power, the weight requirements for aircraft are becoming increasingly stringent, and the demand for lightweight design of aircraft accessories is becoming increasingly urgent. The aviation fuel pump is the core component of the aircraft fuel system. It is of great significance to reduce the mass of redundant structures and improve the power to weight ratio of pumps while ensuring structural strength. Traditional fuel pump design mainly relies on the designer's experience in selecting structural forms and determining parameters. With the development of technology, especially finite element technology, important methods and means have been provided for strength analysis in the design process of fuel pump structures. However, in terms of design methods, pump design has not yet broken through the limitations of traditional empirical design, such as the determination of structural topology, selection of shape, and optimization of structural size parameters. This article explores the commonly used methods of structural optimization design, with a focus on introducing topology optimization theory and its applications. It takes the structural optimization design of a certain type of fuel pump component as the research object, in order to provide some theoretical reference for future fuel pump structural design optimization. © The Institution of Engineering & technology 2024.

关键词： Fuel pump Shape optimization Structural design Topology optimization Abstract

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