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Dynamic responses analysis of a 5 MW spar-type floating wind turbine under accidental ship-impact scenario

Lookup NU author(s): Yichi Zhang, Professor Zhiqiang Hu



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Ship impact against offshore floating wind turbine (OFWT) has been identified as one of the majorhazards with the development of OFWTs. The dynamic responses of OFWTs under ship impactshould be taken into consideration during the design phase. This paper addresses a study on thedynamic responses of an OFWT in ship collision scenarios. Firstly, a mathematical model forexternal mechanism of ship-OFWT collision scenario is developed. Secondly, this model is combinedwith an in-house programme, DARwind, which can be used to predict nonlinear dynamicresponses of whole OFWT system in time-domain. With the newly combined analysis tool,simulation cases for different scenarios are conducted to investigate the nonlinear dynamic responsesof OFWT system, including the cases of still water condition, wave-only condition andwind-wave condition. It is shown that in still water condition, the ship impact will more obviouslychange the responses of motions and mooring system, compared with those in wave and wavewindconditions. In the wave-only condition, these motions responses of platform are suppressedby wave effect, but the tower vibration and tower top deformation are sensitive to shipcollision. For the wave-wind combined condition, the motions increment in surge and pitch due toship collision becomes smaller than that of wave-only condition, but yaw motion has a considerablevariation compared with those of the other two conditions. Additionally, the blade tipdeformation increment due to ship collision are analyzed and it is found that the edgewise tipdeformation got more obvious increment than that of flapwise. To further asses the safety ofOFWT, the acceleration at nacelle are analyzed because some equipment might be sensitive toacceleration. The analysis results indicate that even though the OFWT structure doesn’t getcritical damage by ship impact, the equipment inside may still fail to work due to the high valueof acceleration induced by ship impact. The research outcomes can benefit the safety design ofOFWT in the engineering practice.

Publication metadata

Author(s): Zhang Y, Hu Z, Ng C, Jia C, Jiang Z

Publication type: Article

Publication status: Published

Journal: Marine Structures

Year: 2020

Volume: 75

Print publication date: 01/01/2021

Online publication date: 28/10/2020

Acceptance date: 28/08/2020

Date deposited: 28/10/2020

ISSN (print): 0951-8339

ISSN (electronic): 1873-4170

Publisher: Elsevier


DOI: 10.1016/j.marstruc.2020.102885


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