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Table of Contents
Preface; Acknowledgements; List of Abbreviations; Contents; 1 Introduction; Abstract; 1.1 Background; 1.1.1 Space Debris Problem; 1.1.2 Active Debris Removal; 1.1.2.1 Removal Methods Comparison; 1.1.2.2 Capture Methods Comparison; 1.1.3 Space Net Capture and Deorbiting; 1.2 Related Project Research; 1.2.1 Tethered Satellite; 1.2.2 Space Nets; 1.3 Related Technology Progress; 1.3.1 Tether Dynamics; 1.3.2 Dynamics and Control of Nonrotating Space Net; 1.3.3 Dynamics and Control of Rotating Space Net; 1.3.4 Dynamics and Control of Tethered Combination Deorbiting; 1.4 Outline
2 Cable Dynamics ElementsAbstract; 2.1 Geometric Nonlinear Characteristics of Cable; 2.2 Continuous Model of Cable; 2.2.1 General Dynamics Equation of Space Cable Coordinate System; 2.2.2 Dynamics of Continuous Space Cable; 2.2.3 Simplification for Dynamics of Continuous Space Cable; 2.2.4 Reflection and Transmission of Stress Wave Between Cable Sections; 2.2.4.1 Basic Equation; 2.2.4.2 Discussion of Several Cases; 2.2.5 Numerical Solution of Stress Waves with Characteristic Line; 2.2.5.1 Discretization of Characteristic Line Equation; 2.2.5.2 Numerical Simulation
2.3 Spring Damper Model of Cable2.3.1 Description of Model; 2.3.2 Computation of Internal Force; 2.3.3 Computation of External Force; 2.3.4 System Dynamics; 2.4 Multi-rigid-body Model of Cable; 2.4.1 Description of Model; 2.4.2 Recurrence of Constraint Force; 2.5 Conclusion; 3 Dynamics of Space Nets; Abstract; 3.1 Introduction; 3.1.1 System Description; 3.1.2 Material; 3.2 Modeling Methodology; 3.2.1 Basic Assumption; 3.2.2 Finite Element Model; 3.2.3 Forces on Tether Node; 3.2.4 Equation of Motion; 3.3 Ejection Mode Analysis; 3.3.1 Multi-point Ejection Mode
3.3.2 Evaluation Index of Space Nets3.3.2.1 Design Index; 3.3.2.2 Property Index; 3.3.2.3 Intensity Index; 3.3.3 Numerical Simulation; 3.4 Ejection Parametric Sensitivity Analysis; 3.4.1 Orthogonal Experimental Method; 3.4.2 Ejection Parameter Analysis; 3.5 Multi-objective Optimization; 3.5.1 MOP of Space Net; 3.5.2 Framework of MOEA/D; 3.5.3 Optimization Result; 4 Simulation of Space Net Capture Process; Abstract; 4.1 Introduction; 4.1.1 Systematic Simulation Model; 4.1.1.1 Space Net Model; 4.1.1.2 Satellite Model; 4.1.1.3 Flying Weight Model with Net-Closing Device
4.1.2 Element Types and Selection4.1.3 Meshing of Finite Element; 4.1.4 Selection of Contact Type; 4.2 Deploying Simulation Analysis; 4.2.1 Simulation Result; 4.2.2 Result Analysis; 4.2.2.1 Effects of Initial Velocity on Deploying Process; 4.2.2.2 Effects of Directions for Initial Velocity on Deploying Process; 4.2.2.3 Effects of Damping Between Cables on Deploying Process; 4.2.2.4 Effects of Rotating Space Net on Deploying Process; 4.3 Impact Simulation Analysis; 4.3.1 Frontal Impact Analysis; 4.3.2 Oblique Impact Analysis; 4.3.2.1 Elevation Deviation; 4.3.2.2 Azimuth Angle Deviation
2 Cable Dynamics ElementsAbstract; 2.1 Geometric Nonlinear Characteristics of Cable; 2.2 Continuous Model of Cable; 2.2.1 General Dynamics Equation of Space Cable Coordinate System; 2.2.2 Dynamics of Continuous Space Cable; 2.2.3 Simplification for Dynamics of Continuous Space Cable; 2.2.4 Reflection and Transmission of Stress Wave Between Cable Sections; 2.2.4.1 Basic Equation; 2.2.4.2 Discussion of Several Cases; 2.2.5 Numerical Solution of Stress Waves with Characteristic Line; 2.2.5.1 Discretization of Characteristic Line Equation; 2.2.5.2 Numerical Simulation
2.3 Spring Damper Model of Cable2.3.1 Description of Model; 2.3.2 Computation of Internal Force; 2.3.3 Computation of External Force; 2.3.4 System Dynamics; 2.4 Multi-rigid-body Model of Cable; 2.4.1 Description of Model; 2.4.2 Recurrence of Constraint Force; 2.5 Conclusion; 3 Dynamics of Space Nets; Abstract; 3.1 Introduction; 3.1.1 System Description; 3.1.2 Material; 3.2 Modeling Methodology; 3.2.1 Basic Assumption; 3.2.2 Finite Element Model; 3.2.3 Forces on Tether Node; 3.2.4 Equation of Motion; 3.3 Ejection Mode Analysis; 3.3.1 Multi-point Ejection Mode
3.3.2 Evaluation Index of Space Nets3.3.2.1 Design Index; 3.3.2.2 Property Index; 3.3.2.3 Intensity Index; 3.3.3 Numerical Simulation; 3.4 Ejection Parametric Sensitivity Analysis; 3.4.1 Orthogonal Experimental Method; 3.4.2 Ejection Parameter Analysis; 3.5 Multi-objective Optimization; 3.5.1 MOP of Space Net; 3.5.2 Framework of MOEA/D; 3.5.3 Optimization Result; 4 Simulation of Space Net Capture Process; Abstract; 4.1 Introduction; 4.1.1 Systematic Simulation Model; 4.1.1.1 Space Net Model; 4.1.1.2 Satellite Model; 4.1.1.3 Flying Weight Model with Net-Closing Device
4.1.2 Element Types and Selection4.1.3 Meshing of Finite Element; 4.1.4 Selection of Contact Type; 4.2 Deploying Simulation Analysis; 4.2.1 Simulation Result; 4.2.2 Result Analysis; 4.2.2.1 Effects of Initial Velocity on Deploying Process; 4.2.2.2 Effects of Directions for Initial Velocity on Deploying Process; 4.2.2.3 Effects of Damping Between Cables on Deploying Process; 4.2.2.4 Effects of Rotating Space Net on Deploying Process; 4.3 Impact Simulation Analysis; 4.3.1 Frontal Impact Analysis; 4.3.2 Oblique Impact Analysis; 4.3.2.1 Elevation Deviation; 4.3.2.2 Azimuth Angle Deviation