Response of the Mega-Float Equipped With Novel Wave Energy Absorber

Abstract

The hydroelastic response is significant from the viewpoint of the structural design of a Mega-Float. Equipping a Mega-Float with some additional structures, such as vertical plates, is one of the ways to reduce the hydroelastic response easily. However, in general, wave drift force acting on the Mega-Float may be increased, when the Mega-Float is equipped with the additional structures to reduce the response. In the present study, we developed a novel additional structure that was effective in the reduction of both hydroelastic response and wave drift force. Furthermore, we estimated the response of Mega-Float equipped with the additional structures, and compared the result with the value measured in at-sea experiments. As a result, we confirmed both the effectiveness of the novel additional structure and the validity of the estimation method.

Hydroelastic analysis of oblique irregular waves with a pontoon-type VLFS edged with dual inclined perforated plates

“…By means of the theoretical solutions and experimental tests, Ohta et al [12] investigated the performance of a submerged vertical plate attached to the fore-end of a VLFS. Masanobu et al [13] further developed the vertical anti-motion plate with slits and the inverted-L type anti-motion plate and concluded that the inverted-L type anti-motion plate can achieve more desirable efficiency in reducing the hydroelastic responses of the VLFS. Takagi et al [14] proposed another anti-motion device with a simple submerged vertical box attached at the fore-end of the VLFS, in which small-scale experiments were conducted and the results correlated well with the analytical solutions.…”

Mitigation of Hydroelastic Responses in a Very Large Floating Structure by a Connected Vertical Porous Flexible Barrier

“…Takagi et al [6] concluded that, when a box-shaped body is attached to an edge of a VLFS, it reduces not only the deformation but also the shearing force and the moment of the platform, also attaining a good anti-motion performance. Masanobu et al [7] proposed the additional wall with slits and the inverted-L type structures to mitigate the hydroelastic response of the VLFSs. They found that the drift force and the vertical displacement can be suppressed by providing slits for the anti-motion device.…”

Reducing hydroelastic response of very large floating structures by altering their plan shapes

“…These horizontal plates help in generating reverse flow at the aft-end of the plate that counteract with the incident wave. Curtain wall with slits (Masanobu et al 2003) attached to the fore-end of VLFS have also been proposed to mitigate the hydroelastic response through eddies generated by the slits. Pinkster (1997) also borrowed the air-cushion technology used in hovercrafts and surface effect ships (SES) to reduce the hydroelastic response of VLFS.…”