A Study on an Active Hybrid Decomposed Mooring System for Model Testing in Ocean Basin for Offshore Platforms

Cao, Yusong; Tahchiev, Galin

doi:10.1115/omae2013-11471

Cited by 13 publications

(6 citation statements)

References 2 publications

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“…The truncated system is finally replaced by the full-depth one in the numerical analysis, and the QoI, such as extreme motions and mooring line tensions, are evaluated numerically. In spite of recent improvements in the truncation procedures, which have been reviewed for example in Sauder et al (2017); Cao and Tahchiev (2013), passive truncation still requires to calibrate a numerical model of the floater, which is time consuming and induces additional uncertainties. Furthermore, since the truncated system used in the model tests is only statically equivalent to the full-depth system, it can be argued that some highly nonlinear effects driven by the floater's dynamics (such as the occurrence of negative air gap or green water on deck) could remain undetected.…”

Section: Introductionmentioning

confidence: 99%

Active truncation of slender marine structures: Influence of the control system on fidelity

Sauder

Marelli

Larsen

et al. 2018

Applied Ocean Research

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Performing hydrodynamic model testing of ultra-deep water floating systems at a reasonable scale is challenging, due to the limited space available in existing laboratories and to the large spatial extent of the slender marine structures that connect the floater to the seabed. In this paper, we consider a method based on real-time hybrid model testing, namely the active truncation of the slender marine structures: while their upper part is modelled physically in an ocean basin, their lower part is simulated by an adequate numerical model.The control system connecting the two substructures inevitably introduces artefacts, such as noise, biases and time delays, whose probabilistic description is assumed to be known.We investigate specifically how these artefacts influence the fidelity of the active truncation setup, that is its capability to reproduce correctly the dynamic behaviour of the system under study. We propose a systematic numerical method to rank the artefacts according to their influence on the fidelity of the test. The method is demonstrated on the active truncation of a taut polyester mooring line.

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Section: Introductionmentioning

confidence: 99%

Active truncation of slender marine structures: Influence of the control system on fidelity

Sauder

Marelli

Larsen

et al. 2018

Applied Ocean Research

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“…Some examples of each discipline's fundamental progress or advanced methods have been provided by Sauder et al (2016) including control strategies (Carrion and Spencer Jr, 2007) and stability analyses (Kyrychko et al, 2006). The application of RTHA in renewable energy and marine technology can be found in Cao and Tahchiev (2013), Chabaud et al (2013), Li et al (2006), Munteanu et al (2010), Signorelli et al (2011 and references therein. The objective aerodynamic thrust and generator torque should be considered or actuated which are the most significant effects on floaters when using a modified numerical simulation.…”

Section: Hybrid Basin Experimentsmentioning

confidence: 99%

Review of Experimental-Numerical Methodologies and Challenges for Floating Offshore Wind Turbines

Chen

2020

J. Marine. Sci. Appl.

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Due to the dissimilar scaling issues, the conventional experimental method of FOWTs can hardly be used directly to validate the full-scale global dynamic responses accurately. Therefore, it is of absolute necessity to find a more accurate, economic and efficient approach, which can be utilized to predict the full-scale global dynamic responses of FOWTs. In this paper, a literature review of experimental-numerical methodologies and challenges for FOWTs is made. Several key challenges in the conventional basin experiment issues are discussed, including scaling issues; coupling effects between aero-hydro and structural dynamic responses; blade pitch control strategies; experimental facilities and calibration methods. Several basin experiments, industrial projects and numerical codes are summarized to demonstrate the progress of hybrid experimental methods. Besides, time delay in hardware-in-the-loop challenges is concluded to emphasize their significant role in real-time hybrid approaches. It is of great use to comprehend these methodologies and challenges, which can help some future researchers to make a footstone for proposing a more efficient and functional hybrid basin experimental and numerical method.

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“…ReaTHM testing has primarily been used to apply numerically simulated wind forces to model scale testing of an offshore floating wind turbine [5,6,7]. Recent studies have aspired to develop such methods for applications with truncated mooring lines, both in numerical studies [8,9] and in experimental applications [10,11]. The long-term aim of these studies is to emulate systems that are of too large geometric extent to be implemented as a pure physical test setup in a test basin (e.g.…”

Section: Introductionmentioning

confidence: 99%

Controller Analysis in Real-Time Hybrid Model Testing of an Offshore Floating System

Vilsen

Sauder

Føre

et al. 2018

Volume 7B: Ocean Engineering

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This paper presents an experimental study using Real-Time Hybrid Model (ReaTHM) testing of a moored floating cylindrical buoy, conducted in a wave basin. ReaTHM testing is a method for studying the dynamics of marine structures by partitioning the system into numerical and physical substructures that are then coupled in real-time using a control system. In this study, the floating cylinder buoy is modelled physically, and the mooring system modelled numerically. In this paper, the effect of selected controller parameters on the performance of the control system is studied, for both wave frequency and low-frequency ranges. The architecture/design of the control system is presented in the first part of the paper, while results from experimental tests with wave excitation on the physical substructure are presented in the second part of the paper.

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A Study on an Active Hybrid Decomposed Mooring System for Model Testing in Ocean Basin for Offshore Platforms

Cited by 13 publications

References 2 publications

Active truncation of slender marine structures: Influence of the control system on fidelity

Active truncation of slender marine structures: Influence of the control system on fidelity

Review of Experimental-Numerical Methodologies and Challenges for Floating Offshore Wind Turbines

Controller Analysis in Real-Time Hybrid Model Testing of an Offshore Floating System

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