Journal of Marine Science and Application

, Volume 16, Issue 3, pp 243–260 | Cite as

Numerical study of a novel procedure for installing the tower and Rotor Nacelle Assembly of offshore wind turbines based on the inverted pendulum principle

Article

Abstract

Current installation costs of offshore wind turbines (OWTs) are high and profit margins in the offshore wind energy sector are low, it is thus necessary to develop installation methods that are more efficient and practical. This paper presents a numerical study (based on a global response analysis of marine operations) of a novel procedure for installing the tower and Rotor Nacelle Assemblies (RNAs) on bottom-fixed foundations of OWTs. The installation procedure is based on the inverted pendulum principle. A cargo barge is used to transport the OWT assembly in a horizontal position to the site, and a medium-size Heavy Lift Vessel (HLV) is then employed to lift and up-end the OWT assembly using a special upending frame. The main advantage of this novel procedure is that the need for a huge HLV (in terms of lifting height and capacity) is eliminated. This novel method requires that the cargo barge is in the leeward side of the HLV (which can be positioned with the best heading) during the entire installation. This is to benefit from shielding effects of the HLV on the motions of the cargo barge, so the foundations need to be installed with a specific heading based on wave direction statistics of the site and a typical installation season. Following a systematic approach based on numerical simulations of actual operations, potential critical installation activities, corresponding critical events, and limiting (response) parameters are identified. In addition, operational limits for some of the limiting parameters are established in terms of allowable limits of sea states. Following a preliminary assessment of these operational limits, the duration of the entire operation, the equipment used, and weather- and water depth-sensitivity, this novel procedure is demonstrated to be viable.

Keywords

offshore wind turbine installation crane vessel shielding effects critical events limiting parameters inverted pendulum allowable sea states 

基于倒置单摆原理的海上风机塔柱和转子机舱新的安装过程的数值模拟研究

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Notes

Acknowledgments

This work has been financially supported by the Research Council of Norway granted through the Department of Marine Technology, the Centre for Ships and Ocean Structures (CeSOS) and the Centre for Autonomous Marine Operations and Systems (AMOS) from the Norwegian University of Science and Technology (NTNU).

The first author also acknowledges the financial support from Escuela Politécnica Nacional (EPN) through the project PIMI-15-03 “Investigación y evaluación de sistemas innovadores de propulsión distribuida con ingestión de capa límite para mejorar la eficiencia propulsiva y térmica de vehículos aéreos no tripulados aplicados en los sectores: agrícola, medicina y vigilancia”.

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Copyright information

© Harbin Engineering University and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Wilson Guachamin Acero
    • 1
    • 2
    • 3
    • 4
  • Zhen Gao
    • 1
    • 3
    • 4
  • Torgeir Moan
    • 1
    • 3
    • 4
  1. 1.Department of Marine TechnologyNorwegian University of Science and TechnologyTrondheimNorway
  2. 2.Departamento de Ingeniería MecánicaEscuela Politécnica NacionalQuitoEcuador
  3. 3.Centre for Ships and Ocean StructuresNorwegian University of Science and TechnologyTrondheimNorway
  4. 4.Centre for Autonomous Marine Operations and SystemsNorwegian University of Science and TechnologyTrondheimNorway

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