Proceedings of the 6th China Aeronautical Science and Technology Conference: Volume II (Lecture Notes in Mechanical Engineering)

This book contains the original peer-reviewed research papers presented at the 6th China Aeronautical Science and Technology Conference held in Wuzhen, Zhejiang Province, China, in September 2023. Topics covered include but are not limited to Navigation/Guidance and Control Technology, Aircraft Design and Overall Optimisation of Key Technologies, Aviation Testing Technology, Airborne Systems/Electromechanical Technology, Structural Design, Aerodynamics and Flight Mechanics, Advanced Aviation Materials and Manufacturing Technology, Advanced Aviation Propulsion Technology, and Civil Aviation Transportation. The papers presented here share the latest findings in aviation science and technology, making the book a valuable resource for researchers, engineers and students in related fields. Contents Infrared Identification and Detection of Internal Water Defects in Navigable Aircraft Composite Materials 1 Introduction 2 Experimental Methods 3 Finite Element Simulation 4 Detection and Identification of Composite Material Defects 5 Conclusion References Flow Prediction and Analysis of Aviation Hydraulic System Based on XGBoost and Feature Attribution 1 Introduction 2 Extreme Gradient Boosting 3 Feature Attribution Method 3.1 Gain Based Method 3.2 Permutation Feature Importance 3.3 Shapley Additive Explanations 4 Flow Prediction of Hydraulic System 4.1 Data Set Description 4.2 Feature Engineering 4.3 Experiment Result and Analyses 5 Conclusion References Design of Control System for Dynamic Derivative Test System in Low-Speed Wind Tunnel 1 Introduction 2 System Scheme Design 2.1 Drive Control Design of Oscillation Mechanism 2.2 Drive Control Design of Angle of Attack/Sideslip Mechanism 2.3 Control Architecture Design of the Whole System 3 Key Technology 3.1 Design of Electro-Hydraulic Servo Control Algorithm 3.2 Slow-Start and Slow-Stop control function 3.3 Integrated Management Control Software 4 System Verification 4.1 Control System Verification 4.2 Wind Tunnel Verification Test 5 Conclusion References Study on Health Management System of Air Turbine Starter for Aviation 1 Introduction 2 Technology Trends and Directions 3 Key Factor Selection 3.1 Vibration Characteristic Monitoring 3.2 Reduced Power Monitoring 3.3 Oil System Monitoring 3.4 Temperature Curve Monitoring 3.5 Speed Curve Monitoring 4 “QM&FDS” System Implementation Method 5 Summary and Prospect References Thermal-Mechanical Coupled Finite Element Analysis of T-type Friction Stir Welding 1 Introduction 2 Basic Theory of Finite Element 2.1 Heat Source Model of T-type Friction Stir Welding Tool 2.2 Material Constitutive of Workpiece 3 Finite Element Analysis 3.1 Finite Element Module Method 3.2 Material Parameter 4 Results and Analysis 4.1 Model Reliability Verification 4.2 Temperature Field of T-type Friction Stir Welding Process 4.3 Equivalent Plastic Strain of T-type Friction Stir Welding Process 4.4 Stress Evaluation of T-type Friction Stir Welding Process 4.5 Reaction Force in T-type Friction Stir Welding Process 5 Experimental Verification 5.1 Test Equipment 5.2 Test Result 6 Conclusion References Experimental Research on the Aero Derivative Gas Turbine with Emulsified Fuel 1 Introduction 2 Mechanism and Emission Reduction Scheme 2.1 Mechanism of Nitrogen Oxide Formation 2.2 Emission Reduction Scheme 3 Experimental Setup 4 Results and Discussion 4.1 Emissions 4.2 Performance 5 Conclusions References Prediction of Cavity Noise Based on IDDES and NLAS Methods 1 Introduction 2 Numerical Methods 2.1 Numerical Solution of IDDES Method 2.2 Non-linear Acoustics Solver 3 Calculation Model and Parameter Settings 4 Numerical Results and Discussion 5 Conclusions References Curing Agent and Additive Matrix Effect of Graphene Nanosheets-Exfoliated Manganese Oxides Absorbing Composites 1 Introduction 2 Experimental Sections 2.1 Reagents 2.2 Preparation and Formation of Materials 2.3 Characterization and Measurements 3 Results and Discussion 3.1 Electromagnetic Responses of Blank Composites 3.2 Electromagnetic Response of Matrix Subtracted for GNS-EMO Composites 3.3 Electromagnetic Loss of Unfilled Composites 3.4 Electromagnetic Loss Way of the Filled and Unfilled Composites 4 Conclusions References On-site Abnormal Monitoring and Analysis Platform for Aircraft Assembly and Its Application 1 Introduction 2 Analysis of Typical Abnormal Problems in Aircraft Assembly Site 2.1 Analysis on Characteristics of Abnormal Problems 2.2 Classification of Typical Abnormal Problems 3 On-site Abnormal Monitoring and Analysis Platform for Aircraft Assembly 3.1 Analysis of Requirements of Management and Control of Abnormal Problems on Assembly Site 3.2 On-site Abnormal Monitoring and Analysis Platform Architecture 4 Case Application 5 Conclusion References Force-Position Hybrid Control of Motion Simulation Platform Based on Cable Drive 1 Introduction 2 Kinematics and Dynamics Modeling 2.1 Cable Drive Motion Simulation Platform 2.2 Kinematic Modeling of Simulated Motion Platform 2.3 Dynamic Modeling of Simulated Motion Platform 3 Cable Tension Distribution 4 Control System Design 5 Simulation and Analysis 6 Conclusion References Preliminary Study on Sonic Boom Measurement in Wind Tunnel Based on PIV Technique 1 Introduction 2 The New Method 3 Validation of the Method 3.1 Simulation Method 3.2 Validation of Simulation 3.3 Validation of Sonic Boom Measurement 4 Analysis of Errors’ Effects 5 Conclusions References A Helicopter Scheduling Model for Flood Aviation Emergency Rescue Considering Bilateral Matching and Time Satisfaction 1 Introduction 2 Problem Description 2.1 Assumption 2.2 Problem Analysis 3 Model Building 3.1 The Perceptual Satisfaction Function for Bilateral Matching of Helicopters and Tasks Based on Prospect Theory 3.2 The Task Time Satisfaction Function Based on Soft Time Window 3.3 Model Parameters 3.4 Emergency Rescue Helicopter Scheduling Model Considering Bilateral Matching and Time Satisfaction 4 Model Solving 4.1 Chromosome Encoding and Decoding 4.2 Algorithm Design 5 Numerical Examples 5.1 Example Solution 5.2 Comparison and Analysis of Scheduling Plans Considering and not Considering Bilateral Matching Degree 5.3 Comparison and Analysis of Scheduling Plans Under Different Model Solving Strategies 6 Conclusion References Research on Multi-objective Optimization Methods for Aircraft Energy Conversion System Control Unit 1 Introduction 2 System Model Design and Control Strategy 2.1 Multi-energy System Topology Design 2.2 Multi-energy System Modeling and Simulation 3 Results 4 Conclusion References Direct Numerical Simulation of Turbulent Spray Autoignition of n-Heptane/Air Under Low Initial Air Temperature 1 Introduction 2 Numerical Method 2.1 Liquid Phase Governing Equations 2.2 Gas Phase Governing Equations 2.3 Numerical Method 3 Computational Details 4 Results and Discussion 4.1 General Autoignition Process 4.2 Analysis of the Ignition Kernel 5 Conclusions References Research on Design of Low Reynolds Number Airfoil Based on DISC Method 1 Introduction 2 Theory of DISC Method 3 Numerical Method Validation 3.1 DISC Method Programming 3.2 Calculation Method and Grid Generation 3.3 Example Validation 4 Low Reynolds Number Airfoil Inverse Design 5 Aerodynamic Characteristics of Design Airfoil 6 Conclusion References Research on Optimization Design of Low Reynolds Number Airfoils Based on CFD 1 Introduction 2 Simulation Method and Verification 2.1 Transition Model 2.2 Computational Grid and Methods 2.3 Numerical Method Validation 3 Airfoil Parameterization 4 Optimization Algorithm 5 Airfoil Optimization Design 6 Design Conditions and Optimization Results 6.1 Design Conditions 6.2 Optimization Results 7 Conclusions References Investigation on the Simplified Engine Model in Propulsion Airframe Integration of the Blended Wing Body Transport 1 Introduction 2 Research Method 2.1 Numerical Simulation Method 2.2 Intake and Exhaust Simulation 3 Comparison of Isolated Nacelles 3.1 Nacelle Models 3.2 Cruise Condition 3.3 Low-Speed Maximum Thrust Condition 4 The Influence of Nacelle Models on BWB Airframe 4.1 Influence on High Speed Aerodynamic Characteristics 4.2 Influence on Low Speed Aerodynamic Characteristics 5 Conclusion References FBG Strain Measurement of the Aircraft High Temperature Structure 1 Introduction 2 Measurement Theory and System 3 Installation Process 4 Response Characteristic Calibration 5 Test Application 6 Conclusion References Research on Improving the Heat Dissipation Ability of Airborne Fuel Heat Sink Based on Aircraft/Engine Integration 1 Introduction 2 The Challenges Faced by Existing Fuel Thermal Sinks 3 Methods and Modeling of Fuel Thermal Sinks Improvement 3.1 Improvement Methods 3.2 Fuel Thermal Management Modeling 4 Fuel Simulation Analysis and Computational Results 4.1 Calculation Conditions 4.2 Result Analysis 5 Conclusion References A High Precision Design Method for Airborne High Frequency Power Supply 1 Introduction 2 Methods 3 Circuit Hardware Design 3.1 High Precision Sine Instruction Signal Generation 3.2 High Frequency Sine Wave Power Amplification 3.3 Reactive Power Compensation of High Frequency Loop 4 Simulation and Experimental Verification 5 Conclusion References Experimental Study on the Tensile Behavior of Asymmetrically Tapered Composite Laminates 1 Introduction 2 Experiments 3 Experiment Results 3.1 LS-38-A Configuration 3.2 LS-38-B Configuration 3.3 LS-76-A Configuration 3.4 LS-76-B Configuration 4 Discussion 5 Conclusions References Optimization of Decoupling Technology for Hub-And-Spoke Multi-component Sensors 1 Introduction 2 Research on Modeling and Simulation of Multi-component Spoke Sensor 2.1 Structural Modeling of Multi-component Spoke Sensor 2.2 Stress and Strain Analysis of Spoke Sensor 3 Analysis of Decoupling Method for Multi-dimensional Force Sensor 3.1 Least Multiplication Linear Fitting Decoupling Solution Method 3.2 Matrix Decoupling Solving Method Based on Genetic Algorithm 4 Decoupling Test of Multi-dimensional Spoke Force Sensor 5 Conclusions References Multi-objective Optimization of Airport Runway Construction Schedule Considering Activity Overlapping Based on BIM and Genetic Algorithm 1 Establishment of Multi-objective Optimization Model 2 Schedule Optimization 2.1 Fitness Function 2.2 Genetic Algorithm 3 Optimize Software Development and Design 4 Optimize Software Development and Design 4.1 BIM Model Building and Initial Construction Schedule Drawing 4.2 Optimization and Result Analysis 5 Conclusion References Application of Constant-Power Control Electronically Technology in Local Electrical Hydraulic Generation System 1 Introduction 2 Constant-Power Control Electronically LEHGS 2.1 LEHGS 2.2 Constant-Power Control Electronically Technology 2.3 The Analysis Method of Phase Current Load 3 Control Strategy of Constant-Power of LEHGS 4 Simulation Analysis and Test Verification of Constant-Power LEHGS 4.1 Amesim Simulation 4.2 The Analysis of Phase Current Load 4.3 Experimental Validation 5 Conclusion References End-To-End Aircraft Skin Damage Detection Method Based on Ghostnet 1 Introduction 2 Model Structure 2.1 Based on Ghostnet Network Feature Extraction Module 2.2 Multi-layer Feature Fusion Module 2.3 Improved Loss Function 3 Experimental Results and Analysis 3.1 Aircraft Skin Dataset Establishment and Evaluation Indicators 3.2 Experimental Environment and Evaluation Indicators 4 Conclusion References Experimental Study of Bending Vibration Bandgaps for an Acoustic Metamaterial Beam 1 Introduction 2 Vibration Transmissibility for the Locally Resonant Beam 3 Numerical Calculation 4 Experiment 5 Conclusion References Research on AR Adaptive Deck Motion Prediction Technology Based on Forgetting Factor 1 Introduction 2 Design of an AR Model Parameter Estimation Algorithm Based on the Least Squares Method with Multi-innovtion Forgetting Factor 2.1 Design of AR Adaptive Deck Motion Prediction 2.2 Design of Prediction Model Order 2.3 Design of the Future S-Step Prediction Algorithm 3 Deck Motion Prediction Simulation Vadation 3.1 Sine Wave Superposition Form Deterministic Deck Motion Model Prediction Simulation 3.2 Real Measurement Data Form Stochastic Deck Motion Model Prediction Simulation 4 Conclusion References Learning from Temporal Aviation Data to Detect Anomaly Events 1 Introduction 2 Methodology 2.1 Basic LSTM Module 2.2 Residual Module 2.3 Decoder Module 2.4 Distribution-Aware Shuffling Scheme 3 Experiment 3.1 Experiment Setup 3.2 Method Comparisons 3.3 Ablation Study 3.4 Experiment Analysis 4 Conclusion References Simulation and Analysis of Low-Velocity Impact and Buckling of a CFRP 1 Introduction 2 Pre-processing of Finite Element Analysis 3 Result Analysis 3.1 Printing Area 3.2 Comparison of Impact Damage Under Different Inputs 3.3 Analysis of Ultimate Compressive Strength 4 Conclusion References Study on the Influence of the Height Variation of Center of Gravity on Longitudinal Static Stability of AEW 1 Introduction 2 Analysis of Center of Gravity Data of Typical AEW 3 Analysis of the Influence of Center of Gravity Change on Aerodynamic Characteristics 3.1 Conceptual Scheme Data Analysis 3.2 Theoretical Analysis of Flight Mechanics 4 Sensitivity Analysis of Longitudinal Static Stability to Height Variation of Center of Gravity 5 Conclusion References Analysis of Type Certificate for Large Civil Aircraft Engine Lubricating System 1 Introduction 2 Overview of Lubrication System for Large Civil Aircraft Engine 3 Applicable Standards of Large Civil Aircraft Engine Lubrication System 4 Method Recommendation for Oil System Compliance to CCAR-25-R4 4.1 Summary of Oil System Standards 4.2 Recommendations for Oil System Compliance 5 Suggestions for Certification 6 Conclusions References Trending Analysis in Aviation Emissions and Type Certification 1 Introduction 2 Main Factors of Civil Aviation Emissions 3 Civil Aviation Emission Regulations Revision 3.1 ICAO Annex 16 “Environmental Protection” Amendment 3.2 Current Emission Regulations of Major World Contracting States 3.3 Compliance of In-Service Engines with Emission Regulations 4 Impact of New CCAR-34 Regulations on Large Transport Category Aircraft Type Certification Process 5 Conclusions References Wideband Transmission/Absorption Switchable Metasurface with Dual-Polarization 1 Introduction 2 Unit Cell Design 2.1 Switchable FSS 2.2 Reconfigurable Lossy Layer 3 Full Structure Evaluation 4 Feeding Strategy 4.1 Feeding Strategy for Switchable FSS 4.2 Feeding Strategy for Reconfigurable Lossy Layer 5 Summary and Discussion References A Simple Method for Studying Aero-Propulsion Characteristics of a Distributed Electric Propulsion Aircraft 1 Introduction 2 Methodology 2.1 Multidisciplinary Analysis Framework for Electric Aircraft 2.2 Modeling of Electric Propulsion System 2.3 Propeller/Wing Aero-Propulsion Coupling Model 3 Aerodynamic Verification and Validation of the Model 3.1 Model Description 3.2 Verification and Validation 4 Case Studies 4.1 Research on the Different Rotating Direction of Distributed Propellers 4.2 Aerodynamic Optimization Design 4.3 Analysis of Electric Propulsion System Parameters 5 Conclusions References System Design and Underwater Trajectory Tracking Control of Dual-Rotor Unmanned Aerial-Aquatic Vehicle 1 Introduction 2 Design and Modeling 2.1 Configuration and Operating Mode 2.2 Mathematical Model 3 Underwater Simulation 3.1 Control Allocation 3.2 Controller Design 4 Simulation Results 5 Conclusion References Research on Failure Cause Analysis Method Based on Aircraft Maintenance Records 1 Introduction 2 Analysis of Aircraft Maintenance Record Text Data 3 Analysis Model for Fault Causes of Aircraft Maintenance Records 3.1 Model Framework 3.2 Preprocessing of Aircraft Maintenance Record Datasets 3.3 Input Vector Representation of Aircraft Maintenance Records 3.4 Aircraft Maintenance Record Feature Presentation Layer 3.5 Feature Extraction and Classification of Aircraft Maintenance Records 4 Experimental Results and Analysis 4.1 Experimental Environment and Data 4.2 Analysis of Experimental Results 5 Conclusion References Mechanical Properties of a Tapered Composite Structure in a Movable Aircraft Wing 1 Introduction 2 Compression Test 2.1 Materials and Structure 2.2 Testing Results 3 Simulation Results Under Compression 4 Conclusions References Synchronicity Analysis of Electric Thrust Reverser Actuation System 1 Introduction 2 Operation Principle of Thrust Reverser System 2.1 Structure Schematic of Cascade Thrust Reverser 2.2 Operation of E-TRAS 2.3 Principle of Synchronous Mechanism of Actuation System 3 Actuation System Modeling 3.1 Mathematical Model of Synchronous Mechanism 3.2 Simscape Model of Synchronous Mechanism 4 Simulation and Analysis Results 4.1 Simulation Parameters Setting 4.2 Analysis of Actuators Synchronicity 4.3 Analysis of the Influence of Actuator Transmission Ratio on System Synchronicity 4.4 Analysis of the Influence of FS Flexibility on System Synchronicity 4.5 Analysis of the Influence of Asynchronous Loads on System Synchronicity 5 Conclusion References Flight Safety Assessment Method of Civil Aircraft During Approach Based on Cluster Analysis 1 Introduction 2 Selection of Flight Safety Monitoring Parameters During Approach 2.1 Decision Requirement Analysis During Approach 2.2 Decision Requirement Analysis of the Stable Approach 2.3 Monitoring Parameter Selection of the Stable Approach 3 Stable Approach Safety Boundary Establishment Method Based on Cluster Analysis 3.1 One-Class Support Vector Machine (OCSVM) 3.2 Density Based Spatial Clustering of Applications with Noise (DBSCAN) 3.3 Example for Calculation of Stable Approach Safe Boundary 4 Example of Unsafe Event Assessment in the Civil Aviation Approach Phase 5 Conclusions References Numerical Simulation of Ground-Effect Wing with Front Engine Blowing 1 Introduction 2 Numerical Method and Validation 3 Computational Model and Grid 4 Results and Discussions 5 Conclusions References Optimization Design of Electrical Axial Fan Based on NSGA - II Algorithm 1 Introduction 2 Fan Blade Parametric Design 2.1 Initial Design 2.2 Parametric Modeling 3 Optimization Method for Fan Blades 3.1 Optimization Objectives 3.2 Optimization Parameters 3.3 Constraint Conditions 3.4 Optimization Algorithm 3.5 Realization of Fan Blade Optimization 4 Analysis of Optimization Result 4.1 Optimized Blade Model 4.2 Simulation Calculation and Analysis 5 Conclusions References An Evaluation Method of Pilot’s Respiratory Status Based on Mask Pressure 1 Introduction 2 Method 2.1 Preprocessing of Mask Pressure 2.2 Feature Extraction - Respiratory Rate 2.3 Feature Extraction - Respiratory Depth 2.4 Feature Extraction – Tidal Volume 3 Experiment and Results 4 Conclusion References Research on Performance of Adaptive Solver Based on Joint Simulation of Aviation Systems 1 Foreword 2 Methodology and Theoretical Support 2.1 Method 2.2 Theoretical Support 3 Tool 3.1 FMI Standard 3.2 Python 4 Analysis and Discussion 4.1 Error 4.2 Calculation Duration 5 Conclusion References A Rapid Evaluation Method of Fatigue Life for Structures Based on Notch Geometry Parameters 1 Introduction 2 Introduction of the New Model 2.1 Linear Description of Stress Field at Notch Root 2.2 The New Fatigue Damage Parameter 3 Test Data Collection and Verification 4 Conclusion References Research on Modeling and Simulation of Environmental Control System for Multipurpose Thermal Utilization of Fighter Aircraft 1 Introduction 2 Modeling and Working Principle of Thermal Comprehensive Utilization Environmental Control System 3 Mathematical Model of Key Components in Environmental Control System 3.1 Calculation Model of Rammed Air Inlet 3.2 Heat Exchanger Model 3.3 Refrigeration Module Model 3.4 Temperature Control Module Model 4 Simulation Results and Analysis 5 Conclusions References Fast Dynamic Simulation Analysis of the Thermal Environment of Aircraft Lubricating Oil and Hydraulic Cooling System 1 Introduction 1.1 A Subsection Sample 2 Basic Principle and Calculation Method 2.1 Mechanism of Heat Transfer in Cabin Thermal Environment 2.2 Fluid Governing Equation 2.3 Co-simulation Method 3 One-Dimensional Thermal Analysis of Cabin Thermal System 3.1 Thermal System Composition 3.2 Simulation Model 3.3 Simulation Result 4 CFD Numerical Simulation of Cabin Thermal Environment 4.1 Mesh Model 4.2 Boundary Conditions 4.3 Simulation Results 5 CFD Numerical Simulation of Cabin Thermal Environment References Calculation of Temperature Control and Heat Dissipation in Hydraulic System 1 Introduction 2 Thermal Calculation Method of Hydraulic System 2.1 Teat Generation in Hydraulic System 2.2 Environment Heat Dissipation of Hydraulic System 3 Thermal Simulation of Hydraulic System 3.1 Thermal Simulation Model of Hydraulic System 3.2 Thermal Simulation Calculation of Hydraulic System 4 Conclusions References Numerical Simulation Analysis of Fire Prevention in Electronic Components 1 Introduction 2 Introduction 2.1 Simulation Model 2.2 Verification of Numerical Methods 2.3 Mesh Independence Verification 2.4 Simulation Process Conclusion 3 Analysis of Simulation Results 4 Conclusion References Research and Analysis of Civil Aircraft Engineering Simulator Configuration Management 1 Introduction 2 Goal 3 Objects 4 Implementation 4.1 Configuration Identification 4.2 Configuration Baseline 4.3 Configuration Changes 4.4 Configuration Documentary 5 Summary References Numerical Investigation on Aerodynamic Vector Performance of a Axisymmetric Bypass Dual Throat Nozzle 1 Introduction 2 Computational Models and Numerical Methods 2.1 Computing Methods. 2.2 Grid Irrelevance and Model Verification 2.3 Performance Calculation Formula 3 Calculation Results and Analysis 3.1 Nozzle Flow State Analysis 3.2 Effect of NPR on Internal Flow Characteristics 3.3 Nozzle Vector Performance 4 Conclusions References Battle Damage Repair and Test of Composite Fuselage Panel with Hat Stringer 1 Introduction 2 Test Specimen Design 2.1 Test Plan 2.2 Material Selection 2.3 Specimen Parameters 2.4 Battle Damage Repair Patch Design 3 Finite Element Analysis 3.1 Boundary Conditions 3.2 FEA Results 4 Test Results and Discussion 5 Conclusions References Effects of Hygrothermal Environment on Behavior of Composite Panel with PMI Foam 1 Introduction 2 Structure Layout 2.1 Structure Design 2.2 Materials Selection 3 Test method and Procedure 3.1 Test Plan 3.2 Test Method 3.3 Test Procedure 4 Test results and Discussion 4.1 Test Results Under Room Temperature 4.2 Test Results Under Hygrothermal Environment 5 Conclusions References Design of Static Friction Coefficient Test Bench for Tire and Landing Gear Cabin Door 1 Introduction 2 Design of Test Bench 2.1 Test Principle 2.2 Main Points of Test System Design 3 Test Implementation 4 Summary References Redundant Control of Electric Aircraft Motor Based on Digital Twinning 1 Introduction 2 Mathematical Model of PMSM 3 Based on the MRAS Digital Twin 3.1 Model Reference Adaptive System 3.2 Adjustable Model and Adaptive Law 3.3 Construction of Digital Twin 4 Simulation 5 Conclusion References Effectiveness Verification of Bearing Health Assessment Method Based on SAE-MD 1 Introduction 2 Bearing Health Assessment Method Based on SAE-MD 2.1 Stacked Auto Encoder 2.2 Mahalanobis Distance 2.3 Bearing Health Assessment Method 3 Comprehensive Design Method for Performance Degradation Assessment Capability Test Verification Profile 3.1 Fusion of Flight Characteristics and Parameters Under Different Flight Profiles of Bearings 3.2 Analysis of the Correlation Between Fusion Results and Torque 3.3 Construction of Comprehensive Test Profile 4 Experiments 4.1 Verification Rig Test 4.2 Method Effectiveness Verification 5 Conclusion References Parameter Prediction for Aeroengine Lubrication System Based on a BiLSTM-LSTM Model with Attention Mechanism 1 Introduction 2 Lubrication System 3 Methodology 3.1 Long Short-Term Memory Network 3.2 Bi-directional Long Short-Term Memory Network 3.3 Attention Mechanism 3.4 BiLSTM-LSTM-Attention Network 4 Lubrication System Model Based on Flight Test Data 4.1 Model Establishment of Lubrication Parameters 4.2 Data Preprocessing 4.3 Model Hyperparameter Selection 4.4 Evaluation Indexes 4.5 Results Comparison 5 Conclusion References UAV Swarm Coordination Based on Intelligent Microservices 1 Introduction 2 Related Work 2.1 Artificial Intelligence Microservice 2.2 UAV Swarm Coordination 3 Scenario Analysis 3.1 High Data Throughput 3.2 Dynamic Topology Changes 3.3 Fault Tolerance 4 Key Technologies 4.1 Human-UAV Interaction 4.2 Service Split 4.3 Service Registration and Discovery 4.4 Security and Privacy 5 Future Directions 5.1 Optimization of Computing Resource Allocation 5.2 Integration of Advanced AI Algorithms 5.3 Human-UAV Interaction 6 Conclusions References Analysis on the Equipment SOS Development Through Drone Swarm Technology 1 Introduction 2 Development Status of Foreign Drone Swarm Technology 3 Analysis on Development of Drone Swarm Technology 3.1 Concept Proposal 3.2 Projects Layout 3.3 Technological Breakthroughs 3.4 Equipment Formation 4 Analysis on Development of SOS Confrontation Technology 4.1 Intelligent SOS ‘Optimization’ Construction 4.2 ‘Intelligent’ Confrontation of Intelligent SOS 4.3 ‘Plentiful’ Experience of Intelligent 5 Conclusions References Experience Replay Method with Attention for Multi-agent Reinforcement Learning 1 Introduction 1.1 A Subsection Sample 2 CTDE Deep Reinforcement Learning for Multi-agent 2.1 Muti-agent System 2.2 A Subsection Sample 3 Experience Replay Method with Attention for Multi-agent Reinforcement Learning 4 Results and Discussion 5 Conclusion References Research and Application of Airborne Equipment Management Technology for Large Aircraft Based on Dynamic View 1 Introduction 2 Airborne Equipment Identification Code 3 Dynamic View of Airborne Equipment 4 Airborne Equipment Library Construction 5 Airborne Equipment in Storage 6 Permission Control 7 Configuration Management 8 Change Control 8.1 Changeover Changes 8.2 Swap Number Change 9 Summary References Motion Reliability Analysis of Retractation Mechanism Based on Co-simulation 1 Introduction 2 Definition of Multi-source Random Factors of the Retraction Mechanism 2.1 A Subsection Sample Rotary Tire Landing Gear Retraction Mechanism 2.2 Definition of Multi-source Random Factors 3 Motion Reliability Estimation Model of Retraction Mechanism 3.1 Failure Mode Analysis 3.2 Reliability Estimation Model 4 Co-simulation Model of Retraction Mechanism 4.1 Co-simulation Model 4.2 Test Platform 4.3 Co-simulation Model Verification 5 Reliability Influencing Factor Analysis Based on Co-simulation 5.1 Motion Reliability Calculation of Retraction Mechanism 5.2 Influence Analysis of Motion Reliability of Retraction Mechanism 6 Conclusion References Water Ingestion Test on Length Limited Runway 1 Introduction 2 Length Limited Runway 3 Test Points Arrangement 4 Brake Temperature Control 4.1 Dispatch Brake Temperature Limitation 4.2 Self-taxi Distance Control 5 Initial Deceleration Sign Setting 6 Summary Reference Safety Analysis of Large Aircraft Formation Based on Aerial Refueling Mission 1 Introduction 2 Soft Refueling Formation Configuration of Large Aircraft 3 Analysis on the Docking of the Oil-Receiving Aircrafts’ Dynamic Approach to the Oil-Refueling Aircraft 3.1 Approach Process of Refueling Formation of the oil Refueling Tanker and Oil-Receiving Aircrafts 3.2 Mutual Interference Between Refueling Aircraft and Receiving Aircraft 3.3 Oil-Receiving Plug and Oil-Filling Hose Taper Sleeve Butt-Joint 3.4 Complex Flow Field of Oil Receiving Aircraft in Approach State 4 Safety Design of Formation Refueling and Docking 4.1 Geometric Compatibility 4.2 Aerodynamic Compatibility 4.3 Emergency Treatment 5 Conclusions References Airborne Monocular Vision Guidance Method for Autonomous Landing 1 Introduction 2 The Problem Formulation and Notion 3 Method 3.1 Line Detection and Alignment 3.2 Region-Based Pose Tracking in the Approach Phase 3.3 Structural-Lines-Based Pose Estimation in the Proximity Phase 4 Experimental Evaluation 4.1 Experiments on Synthetic Sequence 4.2 Experiments on Real Sequence 5 Conclusion References Design of Variable Stiffness Liquid Inertial Vibration Eliminator 1 Introduction 2 Principle of the Variable Stiffness LIVE 2.1 Dynamical Equations of the Variable Stiffness LIVE 2.2 Parameter Analysis of the Variable Stiffness LIVE 3 Performance Analysis of the Variable Stiffness LIVE 4 Conclusion References Study on the Effect of Impeller on the Air Supply Parameters of a Partial Intake Pre-Swirl System in an Aero-Engine 1 Introduction 2 Calculation Model and Method 2.1 Research Object 2.2 Numerical Model and Boundary Condition 2.3 Meshing Reliability Verification 2.4 Parameter Definition 3 Calculation Results and Analysis 3.1 Basic Flow Field Information 3.2 Air Supply Mass Flow Rate Analysis 3.3 Air Supply Temperature Analysis 4 Conclusion References Study on Temperature Characteristics of Kerosene Propellant in Carrier Rocket Tanks before Launch 1 Introduction 2 Temperature Model of Parked Kerosene 2.1 Model of Heat Conduction between Kerosene and Environment 2.2 Identification Algorithm of Temperature Variation Coefficient 3 Temperature Variation Model Evaluation and Analysis 3.1 Experimental Data 3.2 Identification of Temperature Variation Coefficient 3.3 Prediction Accuracy of Model 3.4 Analysis of Temperature Variation Characteristics 4 Conclusion References Co-simulation Investigation on Hydraulic Thrust Reverser Actuation System 1 Introduction 2 Analysis of Thrust Reverse Actuation System 2.1 Motion Analysis of Thrust Reverser Device 2.2 Working Principle of Thrust Reverser Actuator System 3 Research Methods 3.1 Mathematical Model 3.2 Simulation Model 4 Results and Discussions 4.1 Function Logic Control Characteristics 4.2 Directional Control Valve Response Characteristics 4.3 Deployment and Stowage Characteristics 4.4 Internal Leakage Characteristics 4.5 Synchronization Characteristics 4.6 Effect of Temperature on the Deployment Performance 5 Conclusions References Author Index