Final report for WP4.3: Enhancement of design methods ... - Upwind

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UPWIND WP4: Offshore Support Structures and Foundations Figure 8.41: Time series of OC3-Hywind platform translation in surge direction with MBS and quasi-static mooring system Figure 8.42: Time series of OC3-Hywind Tower Base My with MBS and quasi-static mooring system 130
UPWIND WP4: Offshore Support Structures and Foundations 9. Development of design requirements 9.1 Literature review of floating offshore standards A literature review of current design standards relevant to offshore floating structures has been performed, together with comments on applicability to floating offshore wind turbines (FOWT), in order to provide input for the standardization of floating wind turbines. GL Guidelines 2005 – Guideline for the Certification of Offshore Wind Turbines Scope: • Guideline applies to the design assessment and certification of offshore wind turbines and offshore wind farms. Applicability for FOWT: • Detailed requirements for design calculations. Description of load cases which cover design situations and external conditions. Is applicable for FOWT too. Extension to further specific requirements is under development with focus on stability requirements and mooring applications. • Restrictions: specific requirements for FOWT (e.g. floating units, mooring) mainly as reference to GL Rules (cited below). GL Rules for Classification and Construction 2007 - Part 6 Offshore Technology – Chapter 2 Mobile Offshore Units Scope: Requirements for the different types of mobile offshore units as: • Units connected to the sea bed by anchoring (mooring) • Units kept on position by dynamic positioning/propelling system • Units connected by legs in jacked up condition Applicability for FOWT: • Requirements for floating and anchored units. Contains mooring requirements • Restrictions: No wind turbine specific design load case requirements IEC 61400-3 - Guideline for Offshore Wind Turbines, Edition 1.0 International Electrotechnical Commission (IEC), Wind Turbines – Part 3: Design requirements of offshore wind turbines, 2009 Scope: • Guideline for fixed offshore wind turbines Applicability for FOWT: • Detailed requirements for design calculations. Description of load cases which cover design situations and external conditions. • Restrictions: No specific requirements for FOWT (e.g. floating units, mooring). • Two extensions have been proposed: DNV - Commentary and amendments to IEC 61400-3 concerning offshore floating turbines ([117], also included in WP 1A1 as an Annex), and IEC TC88 proposal for new work item from Korean NC – Standard for floating offshore wind turbines [118]. DNV Energy Report: Guideline for offshore floating wind turbine structures, 2009 Scope: • This provides requirements and recommendations for design floating support structures for offshore wind turbines. Applicability for FOWT: • Sections in the guideline made mostly reference to the DNV OS-J101, Design of Offshore Wind Turbine Structures, October 2007 and to other Rules for Offshore Structures • Restrictions: Specific load cases for floating offshore wind turbines are still under development and some related aspects are briefly mentioned. DNV OS-J101, Design of Offshore Wind Turbine Structures, October 2010 Scope: • Guideline applies to the design assessment and certification of offshore wind turbines and offshore wind farms. 131
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Project UpWind Contract No.: 019945
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Acknowledgement The presented work
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Summary The overall aim of the UpWi
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Table of Contents Acknowledgement..
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Task 4.1 Integration of support str
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Sequential coupling The sequential
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analysis. In the new multibody code
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Figure 2.4: 2nd global bending mode
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3.2 Comparison of deterministic loa
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Figure 3.5: Time series of axial fo
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• Time domain simulation in ADCoS
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• A supplementary load vector for
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The following results are found: Fi
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Figure 4.5: Output positions in the
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It is directly visible that there i
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ated eigenfrequency is shifted into
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Water levels For the calculation of
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guidelines for the inclusion of cli
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damaging if the frequency of the ex
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uncertain parameters carefully. Thr
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Table 5.3 shows annual reliability
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Steel substructure for offshore win
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Table 5.16 shows the required FDF v
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A Fracture Mechanical (FM) modellin
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Figure 5.4: Annual reliability indi
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Further, the effect of possible ins
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Rainflow evaluation The load cases
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For DLC 7.2 it has to be considered
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Guideline, DLC 1.5). Furthermore, t
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Table 5.28: Output locations for da
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From these results it can be clearl
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Figure 5.11: Normalised DELs with v
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Figure 5.14 presents normalized DEL
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Figure 5.16: Output locations for e
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UPWIND WP4: Offshore Support Struct
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Final report for WP4.3: Enhancement of design methods ... - Upwind

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