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research-article

Methodology for assessment of the allowable sea states during installation of an offshore wind turbine transition piece structure onto a monopile foundation

[+] Author and Article Information
Wilson Guachamin Acero

Department of Marine Technology, Norwegian University of Science and Technology (NTNU), Centre for Ships and Ocean Structures (CeSOS), Centre for Autonomous Marine, Operations and Systems (AMOS), Trondheim NO-7491, Norway; Departamento de Ingeniería Mecánica, Escuela Politécnica Nacional (EPN), Quito, 17-01-2759, Ecuador
wilson.i.g.acero@ntnu.no
wilson.guachamin@epn.edu.ec

Zhen Gao

Department of Marine Technology, Norwegian University of Science and Technology (NTNU), Centre for Ships and Ocean Structures (CeSOS), Centre for Autonomous Marine, Operations and Systems (AMOS), Trondheim NO-7491, Norway
zhen.gao@ntnu.no

Torgeir Moan

Department of Marine Technology, Norwegian University of Science and Technology (NTNU), Centre for Ships and Ocean Structures (CeSOS), Centre for Autonomous Marine, Operations and Systems (AMOS), Trondheim NO-7491, Norway
Torgeir.Moan@ntnu.no

1Corresponding author.

ASME doi:10.1115/1.4037174 History: Received April 09, 2016; Revised June 21, 2017

Abstract

In this paper, a methodology suitable for assessing the allowable sea states for installation a transition piece (TP) onto a monopile (MP) foundation with focus on the docking operation is proposed. The TP installation procedure together with numerical analyses are used to identify critical and restricting events and their corresponding limiting parameters. For critical installation phases, existing numerical solutions based on frequency and time domain analyses of stationary processes are combined to quickly assess characteristic values of dynamic responses of limiting parameters for any given sea state. These results are compared against (nonlinear and non-stationary) time domain simulations of the actual docking operations. It is found that a critical event is the structural damage of the TP's bracket supports due to the potential large impact forces or velocities, and a restricting installation event (not critical) is the unsuccessful mating operation due to large horizontal motions of the TP bottom. By comparing characteristic values of dynamic responses with their allowable limits, the allowable sea states are established. Contact-impact problems are addressed in terms of assumed allowable impact velocities of the colliding objects. A possible automatic motion compensation system and human actions are not modeled. This methodology can also be used in connection with other mating operations such as float-over and topside installation.

Copyright (c) 2017 by ASME
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