title: Dynamic response mitigation of floating wind turbine platforms using tuned liquid column dampers.
abstract: In this paper, we experimentally study and compare the effects of three combinations of multiple tuned liquid column dampers (MTLCDs) on the dynamic performance of a model floating tension-leg platform (TLP) structure in a wave basin. The structural stability and safety of the floating structure during operation and maintenance is of concern for the performance of a renewable energy device that it might be supporting. The dynamic responses of the structure should thus be limited for these renewable energy devices to perform as intended. This issue is particularly important during the operation of a TLP in extreme weather conditions. Tuned liquid column dampers (TLCDs) can use the power of sloshing water to reduce surge motions of a floating TLP exposed to wind and waves. This paper demonstrates the potential of MTLCDs in reducing dynamic responses of a scaled TLP model through an experimental study. The potential of using output-only statistical markers for monitoring changes in structural conditions is also investigated through the application of a delay vector variance (DVV) marker for different conditions of control for the experiments.
authors.affiliation: Hydraulics and Maritime Research Centre (HMRC), School of Engineering, University College Cork, Youngline Industrial Estate, Pouladuff Road, Cork, Ireland Dynamical Systems and Risk Laboratory, Civil and Environmental Engineering, School of Engineering, University College Cork, College Road, Cork, Ireland.
authors.forename: V
authors.initials: V
authors.lastname: Jaksic
authors.affiliation: Hydraulics and Maritime Research Centre (HMRC), School of Engineering, University College Cork, Youngline Industrial Estate, Pouladuff Road, Cork, Ireland.
authors.forename: C S
authors.initials: CS
authors.lastname: Wright
authors.affiliation: Hydraulics and Maritime Research Centre (HMRC), School of Engineering, University College Cork, Youngline Industrial Estate, Pouladuff Road, Cork, Ireland.
authors.forename: J
authors.initials: J
authors.lastname: Murphy
authors.affiliation: Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai, India Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai, India.
authors.forename: C
authors.initials: C
authors.lastname: Afeef
authors.affiliation: Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai, India.
authors.forename: S F
authors.initials: SF
authors.lastname: Ali
authors.affiliation: Department of Electrical and Electronic Engineering, Imperial College London, London SW7 2BT, UK.
authors.forename: D P
authors.initials: DP
authors.lastname: Mandic
authors.affiliation: Dynamical Systems and Risk Laboratory, Civil and Environmental Engineering, School of Engineering, University College Cork, College Road, Cork, Ireland v.pakrashi@ucc.ie.
authors.forename: V
authors.initials: V
authors.lastname: Pakrashi
keywords: offshore wind energy; structural dynamics; surge motions; tension-leg platform; tuned liquid column damper; wave-induced
  vibrations