Installation of offshore wind turbines (OWTs) requires careful planning to reduce costs and minimize associated risks. The purpose of this paper is to present a method for assessing the allowable sea states for the initial hammering process (shallow penetrations in the seabed) of a monopile (MP) using a heavy lift floating vessel (HLV) for use in the planning of the operation. This method combines the commonly used installation procedure and the time-domain simulations of the sequential installation activities. The purpose of the time-domain simulation is to quantitatively study the system dynamic responses to identify critical events that may jeopardize the installation and the corresponding limiting response parameters. Based on the allowable limits and the characteristic values of the limiting response parameters, a methodology to find the allowable sea states is proposed. Case studies are presented to show the application of the methodology. The numerical model of the dynamic HLV–MP system includes the coupling between HLV and MP via a gripper device, and soil–MP interaction at different MP penetration depths. It is found that the limiting parameters are the gripper force and the inclination of the MP. The systematic approach proposed herein is general and applies to other marine operations.
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August 2016
Research-Article
Assessment of Allowable Sea States During Installation of Offshore Wind Turbine Monopiles With Shallow Penetration in the Seabed
Lin Li,
Lin Li
Centre for Ships and Ocean Structures (CeSOS),
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: lin.li@ntnu.no
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: lin.li@ntnu.no
Search for other works by this author on:
Wilson Guachamin Acero,
Wilson Guachamin Acero
Centre for Ships and Ocean Structures (CeSOS),
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
Search for other works by this author on:
Zhen Gao,
Zhen Gao
Centre for Ships and Ocean Structures (CeSOS),
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
Search for other works by this author on:
Torgeir Moan
Torgeir Moan
Centre for Ships and Ocean Structures (CeSOS),
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
Search for other works by this author on:
Lin Li
Centre for Ships and Ocean Structures (CeSOS),
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: lin.li@ntnu.no
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: lin.li@ntnu.no
Wilson Guachamin Acero
Centre for Ships and Ocean Structures (CeSOS),
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
Zhen Gao
Centre for Ships and Ocean Structures (CeSOS),
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
Torgeir Moan
Centre for Ships and Ocean Structures (CeSOS),
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
Centre for Autonomous Marine Operations and Systems (AMOS),
Department of Marine Technology,
Norwegian University of Science and Technology (NTNU),
Trondheim NO-7491, Norway
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received December 21, 2015; final manuscript received April 20, 2016; published online June 1, 2016. Assoc. Editor: Yi-Hsiang Yu.
J. Offshore Mech. Arct. Eng. Aug 2016, 138(4): 041902 (17 pages)
Published Online: June 1, 2016
Article history
Received:
December 21, 2015
Revised:
April 20, 2016
Citation
Li, L., Guachamin Acero, W., Gao, Z., and Moan, T. (June 1, 2016). "Assessment of Allowable Sea States During Installation of Offshore Wind Turbine Monopiles With Shallow Penetration in the Seabed." ASME. J. Offshore Mech. Arct. Eng. August 2016; 138(4): 041902. https://doi.org/10.1115/1.4033562
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