Effect of Viscous Damping on Hydrodynamic Response of Spar with Heave Plate

Subbulakshmi, A.; Jose, Jithin; Sundaravadivelu, R.; Selvam, R. Panneer

doi:10.1016/j.aqpro.2015.02.066

Cited by 13 publications

(2 citation statements)

References 6 publications

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“…Further, it is reported that the control strategy is most effective when the tuning of the passive device is to the dominant frequency of wave excitation, and not to the structural frequency, which follows from the principle of the dynamic vibration absorber and the fact that the forcing and structural frequencies are well-separated from each other. Apart from the conventional ship-shaped FPSOs, there have been studies to reduce the heave motions of cylindrical FPSOs, by means of a heaveplate, which is an external appendage plate surrounding the base of the main hull of the FPSO (Amin et al, 2022; Sathia and Vijayalakshmi, 2020; Subbulakshmi et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Wave-induced vibration control of Floating production storage and offloading systems by tuned mass damper inerter

Sarkar,

Chakraborty,

Ghosh

2024

Advances in Structural Engineering

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Floating production storage and offloading systems (FPSOs) are gaining prominence in the offshore industry. FPSOs are generally designed to weathervane, necessitating surge vibration control for station keeping. Since the natural period of surge vibration is far higher than the dominant period of the input wave load, instead of supplemental damping, a high inertial device, such as the tuned mass damper inerter (TMDI), would be effective. This concept has hitherto not been investigated for the FPSO. A frequency domain formulation of the FPSO-TMDI system under wave force, considering interaction of the liquid cargo is presented. Utilizing Froude-Krylov theory, suitably modified to account for diffraction effects, wave force on the FPSO is obtained using field data from North Sea. TMDI parameters are optimized using Genetic Algorithm under different tank-fill conditions. The results demonstrate that the TMDI holds potential in providing an effective and robust performance in controlling the surge motion of FPSOs.

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Section: Introductionmentioning

confidence: 99%

Wave-induced vibration control of Floating production storage and offloading systems by tuned mass damper inerter

Sarkar,

Chakraborty,

Ghosh

2024

Advances in Structural Engineering

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“…Generally, the spar platform performs well in a heave response under waves, provided the diameter at the waterplane is kept to a minimum value. Further, several studies have been conducted on spar platforms that use heave plates to reduce the heave response by increasing added mass and heave damping [19][20][21]. The hydrodynamic effects of heave plates which are usually attached at the bottom of the platform to reduce heave motion have been researched in various studies [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Potential Use of Damping Plates in a Spar-Type Floating Offshore Wind Turbine

Srinivasamurthy,

Ishida,

Yoshida

2024

JMSE

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Spar is one of the promising floating platforms to support offshore wind turbines. Wind heeling moment is large in the case of floating offshore wind turbines and, therefore, it is important to reduce the pitch motion of the floating platform. To address this issue, a spar platform with damping plates is proposed and investigated in this study. (i) Type-A, (ii) Type-B, and (iii) Type-C models of 1/120 scale were fabricated with similar stability parameters. Type-A is a classic spar, Type-B and Type-C are spar with damping plates by replacing the ballast water part with horizontal plates and vertical plates, respectively. The rotor model consists of (i) no disk and (ii) with disk conditions. A series of model scale experiments were carried out in the water tank in regular waves, and motion response was measured. A calculation method based on classic frequency-domain was developed to incorporate damping plates and validated with the experiment results in no disk and with disk conditions. When pitch response of Type-B and Type-C were compared with respect to Type-A, it was found that the spar platform with damping plates reduced the pitch response in most wave frequencies.

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Heave Plate

Wang

Song

2022

Encyclopedia of Ocean Engineering

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Effect of Viscous Damping on Hydrodynamic Response of Spar with Heave Plate

Cited by 13 publications

References 6 publications

Wave-induced vibration control of Floating production storage and offloading systems by tuned mass damper inerter

Wave-induced vibration control of Floating production storage and offloading systems by tuned mass damper inerter

Investigation into the Potential Use of Damping Plates in a Spar-Type Floating Offshore Wind Turbine

Heave Plate

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