ABS 206-2014 GUIDANCE NOTES ON GLOBAL PERFORMANCE ANALYSIS FOR FLOATING OFFSHORE WIND TURBINE INSTALLATIONS.pdf
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1、 Guidance Notes on Global Performance Analysis for Floating Offshore Wind Turbine Installations GUIDANCE NOTES ON GLOBAL PERFORMANCE ANALYSIS FOR FLOATING OFFSHORE WIND TURBINE INSTALLATIONS FEBRUARY 2014 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Co
2、pyright 2014 American Bureau of Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA ii ABSGUIDANCE NOTES ON GLOBAL PERFORMANCE ANALYSIS FOR FLOATING OFFSHORE WIND TURBINE INSTALLATIONS .2014 Foreword Foreword The Guidance Notes contained herein should be used in conjunction with the ABS
3、Guide for Building and Classing Floating Offshore Wind Turbine Installations (FOWTI Guide). These Guidance Notes provide suggested global performance analysis methodologies, modeling strategies and numerical simulation approaches for floating offshore wind turbines. These Guidance Notes do not set a
4、dditional design requirements and criteria other than those specified in the FOWTI Guide, and should be used as a supporting document to the FOWTI Guide. These Guidance Notes become effective on the first day of the month of publication. Users are advised to check periodically on the ABS website www
5、.eagle.org to verify that this version of these Guidance Notes is the most current. We welcome your feedback. Comments or suggestions can be sent electronically by email to rsdeagle.org. ABSGUIDANCE NOTES ON GLOBAL PERFORMANCE ANALYSIS FOR FLOATING OFFSHORE WIND TURBINE INSTALLATIONS .2014 iii Table
6、 of Contents GUIDANCE NOTES ON GLOBAL PERFORMANCE ANALYSIS FOR FLOATING OFFSHORE WIND TURBINE INSTALLATIONS CONTENTS SECTION 1 Introduction 1 1 General . 1 3 Applications . 1 5 Terms and Definitions . 1 5.1 Terminology . 1 5.3 Abbreviations . 6 7 References 6 SECTION 2 Characteristics of Floating Of
7、fshore Wind Turbines 8 1 General . 8 3 Floating Support Structures 8 3.1 TLP-Type Floating Support Structures 8 3.3 Spar-Type Floating Support Structures . 9 3.5 Column-Stabilized (Semi-submersible) Floating Support Structures 10 3.7 Other Types of Floating Support Structures 10 5 Stationkeeping Sys
8、tems . 10 5.1 General 10 5.3 Catenary Moorings 11 5.5 Taut Moorings . 11 5.7 Tendons 11 7 RNA and Control and Safety Systems 12 9 Coupling Effects 12 9.1 General 12 9.3 Aero-elastic Coupling 12 9.5 Aero-control Coupling 12 9.7 Tower-Hull and Mooring Coupling . 12 9.9 Hull-Mooring Coupling . 13 9.11
9、Other Coupling 13 TABLE 1 Representative Natural Periods of Typical FOWT Floating Support Structures 8 iv ABSGUIDANCE NOTES ON GLOBAL PERFORMANCE ANALYSIS FOR FLOATING OFFSHORE WIND TURBINE INSTALLATIONS .2014 SECTION 3 Modeling of Floating Offshore Wind Turbines . 14 1 General . 14 3 Modeling of th
10、e Hull 14 3.1 Hydrostatic Loads 14 3.3 Wave Loads on the Large-Volume Floating Hull . 15 3.5 Wind Loads, Current Loads and Hull VIM 16 3.7 Instability 16 5 Modeling of Flexibility of Tower 16 7 Modeling of Stationkeeping System . 16 7.1 General 16 7.3 Mooring Line Nonlinearity 17 7.5 Finite Element
11、Analysis Approach . 17 9 Modeling of Dynamics of Drive Trains 18 11 Modeling of Rotor Blade and Control and Safety Systems 18 11.1 General 18 11.3 Gravitational and Inertia Loads 18 11.5 Aerodynamic Loads . 19 11.7 Actuation Loads (Operational Loads) 19 13 Modeling of Wind Farm Wake Effects 20 15 El
12、ectrical Cable Considerations 20 SECTION 4 Determination of Environmental Loads 21 1 General . 21 3 Aerodynamic Loads on RNA . 21 5 Typical Environmental Loads on Mooring Lines . 21 5.1 Current Induced Loads 21 5.3 Ice-induced Loads . 22 5.5 Vortex-induced Vibrations of the Mooring Lines 22 5.7 Dire
13、ct Wave Loads on Mooring Lines 22 5.9 Marine Growth . 22 7 Typical Environmental Loads on Floating Support Structures 22 7.1 Wind Loads 22 7.3 Wave Loads . 23 7.5 Current Loads 23 7.7 Marine Growth . 23 7.9 Vortex-Induced Motions (VIM) of the Floating Support Structure 24 7.11 Directional Distributi
14、on . 24 9 Ice and Snow Accumulation Induced Loads . 24 11 Earthquake Loads . 24 13 Ice Loads . 25 SECTION 5 Definition of Analysis Methodologies . 26 1 Frequency-Domain and Time-Domain Analysis . 26 1.1 Frequency-Domain Analysis 26 1.3 Time-Domain Analysis . 26 1.5 Combined Time-Domain and Frequency
15、-Domain Analysis . 27 ABSGUIDANCE NOTES ON GLOBAL PERFORMANCE ANALYSIS FOR FLOATING OFFSHORE WIND TURBINE INSTALLATIONS .2014 v 3 Quasi-Static and Dynamic Analysis 27 3.1 Quasi-Static Analysis 27 3.3 Dynamic Analysis 27 5 Coupled, Semi-Coupled, and Uncoupled Analysis . 28 5.1 Coupled Analysis . 28 5
16、.3 Semi-Coupled Analysis . 28 5.5 Uncoupled Analysis . 28 SECTION 6 Global Motion Analysis 29 1 General . 29 3 Static and Mean Responses . 29 5 Low Frequency Motions 30 7 Wave Frequency Motions . 30 9 High Frequency Motions . 30 11 Tower and Turbine RNA Load Induced Vibrations . 30 13 Damping 30 13.
17、1 Damping of Low Frequency Motions . 30 13.3 Damping of High Frequency Motions 31 15 Analysis Methods 31 15.1 Frequency-Domain Approach 31 15.3 Time-Domain Approach. 32 15.5 Combined Time-Domain and Frequency-Domain Approach. 32 SECTION 7 Air Gap Analysis 33 1 General . 33 3 Air Gap Analysis Methods
18、. 33 3.1 Frequency-Domain Analysis 33 3.3 Time-Domain Analysis 33 3.5 Combined Time-Domain and Frequency-Domain Analysis . 34 3.7 Other Considerations 34 SECTION 8 Mooring Strength Analysis 35 1 General . 35 3 Mooring Strength Analysis Methods . 35 3.1 Frequency-Domain Analyses for Spread Mooring Sy
19、stems 36 3.3 Frequency-Domain Analyses for Single Point Mooring Systems . 36 3.5 Time-Domain Analyses . 36 3.7 Combined Time-Domain and Frequency-Domain Analyses 36 3.9 Maximum and Minimum Tendon Tensions 37 5 Suggested Time-Domain Analysis Procedure 37 7 Design Checks 37 9 Line Length and Geometry
20、Constraints 37 11 Anchor Forces . 38 vi ABSGUIDANCE NOTES ON GLOBAL PERFORMANCE ANALYSIS FOR FLOATING OFFSHORE WIND TURBINE INSTALLATIONS .2014 SECTION 9 Mooring Fatigue Analysis 39 1 General . 39 3 T-N Curve 40 5 Accumulated Fatigue Damage 40 7 Time-Domain Fatigue Analysis Method 41 9 Frequency-Dom
21、ain Fatigue Analysis Method . 41 11 Tendon Fatigue Analysis 41 13 Fatigue Design Checks . 42 SECTION 10 Suggestions for Numerical Simulations . 43 1 General . 43 3 Time Step 43 5 Initial Transient Response 43 7 Wind Generation and Grid Size 44 9 Simulation of Wave Conditions . 44 11 Flexibility of R
22、NA and Tower . 45 13 Simulation Length and Number of Random Seeds 45 15 Analysis Methods and Tools . 47 TABLE 1 Adjustment of Wind Conditions with Different Averaging Time Durations 44 TABLE 2 Adjustment of the Significant Wave Height . 45 TABLE 3 Suggested Minimum DOFs for Modeling Flexibility of t
23、he RNA and the Tower. 45 TABLE 4 Suggested Simulation Time Duration and Number of Random Seeds for the DLCs 47 TABLE 5 Suggested Analysis Methods for the DLCs 48 ABSGUIDANCE NOTES ON GLOBAL PERFORMANCE ANALYSIS FOR FLOATING OFFSHORE WIND TURBINE INSTALLATIONS .2014 1 Section 1: Introduction SECTION
24、1 Introduction 1 General Global performance analyses determine the global effects of environmental conditions and other loads on the Floating Offshore Wind Turbine (FOWT) and its components including the tower, hull structure, mooring lines or tendons, anchors, export electrical cable, etc. Global p
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