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Supervisor's Foreword; Abstract; Parts of this thesis have been published in the following articles:Zheng SM, Zhang YL (2017) Analytical study on hydrodynamic performance of a raft-type wave power device. Journal of Marine Science and Technology. (doi:10.1007/s00773-017-0436-z)Zheng SM, Zhang YL (2016) Wave diffraction and radiation by multiple rectangular floaters. Journal of Hydraulic Research, 54(1):102-115.Zheng SM, Zhang YH, Zhang YL et al. (2015) Numerical study on the dynamics of a two-raft wave energy conversion device.; Acknowledgements; Contents; Abbreviations; 1 Introduction
1.1 Background and Significance of the Research1.2 Review of Wave-Powered Desalination Technology; 1.3 Review of Raft-Type Wave Energy Converters; 1.4 Research Contents and Outline of the Thesis; References; 2 Analytical Study on Hydrodynamic Characteristics; 2.1 Brief Introduction; 2.2 Analytical Model; 2.2.1 Diffraction and Radiation Problem; 2.2.2 Response of Raft-Type Device; 2.2.3 Power Absorption Efficiency, Reflection and Transmission Coefficients; 2.3 Model Validation; 2.4 Effects of Multiple Parameters; 2.4.1 Linear PTO Damping; 2.4.2 Spacing Distance; 2.4.3 Draft; 2.4.4 Raft Numbers
2.4.5 Raft Length2.4.6 Raft Length Ratio; 2.5 Summary; References; 3 Numerical Study on Hydrodynamic Characteristics; 3.1 Brief Introduction; 3.2 Formulation of the Problem; 3.2.1 Frequency Domain Analysis; 3.2.2 Time Domain Analysis; 3.3 Convergence Analysis and Model Validation; 3.4 Results of Frequency Domain Analysis; 3.4.1 Effect of Raft Length and Linear Damping; 3.4.2 Effect of Radius of Gyration; 3.4.3 Effect of Axis Ratio; 3.4.4 Effect of PTO Stiffness; 3.5 Results of Time Domain Analysis; 3.5.1 Effect of Coulomb Damping; 3.5.2 Effect of Radius of Gyration
3.5.3 Effect of Latching Control3.6 Summary; References; 4 Maximum Power Absorption by Two Interconnected Rafts; 4.1 Brief Introduction; 4.2 Mathematical Model; 4.2.1 Maximum Power Absorption with No Constraints; 4.2.2 Maximum Power Absorption with Constraints; 4.3 Results and Discussion; 4.3.1 Model Validation; 4.3.2 Maximum Power Absorption with Optimized cPTO; 4.3.3 Maximum Power Absorption with Optimized cPTO and zPTO; 4.3.4 Wave Power Absorption Under Different Principles; 4.4 Summary; References; 5 Maximum Power Absorption by Multiple Connected Rafts; 5.1 Brief Introduction
5.2 Mathematical Model5.2.1 System Without Connection Constraints or Motion Constraints; 5.2.2 System with Motion Constraints; 5.2.3 System with Connection Constraints; 5.2.4 System with Connection Constraints and Motion Constraints; 5.3 Numerical Method; 5.4 Results and Discussion; 5.4.1 Model Validation; 5.4.2 Effect of Connection Condition; 5.4.3 Effect of Raft Width]; 5.4.4 Effect of Motion Constraints; 5.5 Summary; References; 6 Hydrodynamics of a Raft-Type Device with Oscillator System; 6.1 Brief Introduction; 6.2 Mathematical Model; 6.2.1 Frequency Domain Analysis
1.1 Background and Significance of the Research1.2 Review of Wave-Powered Desalination Technology; 1.3 Review of Raft-Type Wave Energy Converters; 1.4 Research Contents and Outline of the Thesis; References; 2 Analytical Study on Hydrodynamic Characteristics; 2.1 Brief Introduction; 2.2 Analytical Model; 2.2.1 Diffraction and Radiation Problem; 2.2.2 Response of Raft-Type Device; 2.2.3 Power Absorption Efficiency, Reflection and Transmission Coefficients; 2.3 Model Validation; 2.4 Effects of Multiple Parameters; 2.4.1 Linear PTO Damping; 2.4.2 Spacing Distance; 2.4.3 Draft; 2.4.4 Raft Numbers
2.4.5 Raft Length2.4.6 Raft Length Ratio; 2.5 Summary; References; 3 Numerical Study on Hydrodynamic Characteristics; 3.1 Brief Introduction; 3.2 Formulation of the Problem; 3.2.1 Frequency Domain Analysis; 3.2.2 Time Domain Analysis; 3.3 Convergence Analysis and Model Validation; 3.4 Results of Frequency Domain Analysis; 3.4.1 Effect of Raft Length and Linear Damping; 3.4.2 Effect of Radius of Gyration; 3.4.3 Effect of Axis Ratio; 3.4.4 Effect of PTO Stiffness; 3.5 Results of Time Domain Analysis; 3.5.1 Effect of Coulomb Damping; 3.5.2 Effect of Radius of Gyration
3.5.3 Effect of Latching Control3.6 Summary; References; 4 Maximum Power Absorption by Two Interconnected Rafts; 4.1 Brief Introduction; 4.2 Mathematical Model; 4.2.1 Maximum Power Absorption with No Constraints; 4.2.2 Maximum Power Absorption with Constraints; 4.3 Results and Discussion; 4.3.1 Model Validation; 4.3.2 Maximum Power Absorption with Optimized cPTO; 4.3.3 Maximum Power Absorption with Optimized cPTO and zPTO; 4.3.4 Wave Power Absorption Under Different Principles; 4.4 Summary; References; 5 Maximum Power Absorption by Multiple Connected Rafts; 5.1 Brief Introduction
5.2 Mathematical Model5.2.1 System Without Connection Constraints or Motion Constraints; 5.2.2 System with Motion Constraints; 5.2.3 System with Connection Constraints; 5.2.4 System with Connection Constraints and Motion Constraints; 5.3 Numerical Method; 5.4 Results and Discussion; 5.4.1 Model Validation; 5.4.2 Effect of Connection Condition; 5.4.3 Effect of Raft Width]; 5.4.4 Effect of Motion Constraints; 5.5 Summary; References; 6 Hydrodynamics of a Raft-Type Device with Oscillator System; 6.1 Brief Introduction; 6.2 Mathematical Model; 6.2.1 Frequency Domain Analysis