Mooring forces and motion responses of pontoon-type floating breakwaters

Sannasiraj, S. A.; Sundar, V.; Sundaravadivelu, R.

doi:10.1016/s0029-8018(96)00044-3

Cited by 127 publications

(66 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The extended quasi-static model of mooring cable that has been applied into moored floating breakwaters (Sannasiraj et al 1998) is used in this paper. In this model, the cable is assumed to be perfectly flexible, inextensible, and heavy.…”

Section: Model Of the Mooring Cablementioning

confidence: 99%

“…Each blade is modeled as a Bernoulli-Euler cantilever beam vibrating in its fundamental mode. The mooring cables are modeled using an extended quasi-static method (Sannasiraj et al 1998). The hydrodynamic effects are calculated by using Morison's equation and strip theory, and consist of added mass forces, fluid inertia forces and viscous drag forces.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of spar-nacelle-blade coupling on the edgewise response of floating offshore wind turbines

Dinh¹,

Basu²,

Nielsen³

2013

Coupled systems mechanics

View full text Add to dashboard Cite

Abstract. The impact of spar-nacelle-blade coupling on edgewise dynamic responses of spar-type floating wind turbines (S-FOWT) is investigated in this paper. Currently, this coupling is not considered explicitly by researchers. First of all, a coupled model of edgewise vibration of the S-FOWT considering the aerodynamic properties of the blade, variable mass and stiffness per unit length, gravity, the interactions among the blades, nacelle, spar and mooring system, the hydrodynamic effects, the restoring moment and the buoyancy force is proposed. The aerodynamic loads are combined of a steady wind (including the wind shear) and turbulence. Each blade is modeled as a cantilever beam vibrating in its fundamental mode. The mooring cables are modeled using an extended quasi-static method. The hydrodynamic effects calculated by using Morison's equation and strip theory consist of added mass, fluid inertia and viscous drag forces. The random sea state is simulated by superimposing a number of linear regular waves. The model shows that the vibration of the blades, nacelle, tower, and spar are coupled in all degrees of freedom and in all inertial, dissipative and elastic components. An uncoupled model of the S-FOWT is then formulated in which the blades and the nacelle are not coupled with the spar vibration. A 5MW S-FOWT is analyzed by using the two proposed models. In the no-wave sea, the coupling is found to contribute to spar responses only. When the wave loading is considered, the coupling is significant for the responses of both the nacelle and the spar.

show abstract

Section: Model Of the Mooring Cablementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of spar-nacelle-blade coupling on the edgewise response of floating offshore wind turbines

Dinh¹,

Basu²,

Nielsen³

2013

Coupled systems mechanics

View full text Add to dashboard Cite

show abstract

“…It was concluded that though the stiffness of mooring lines did not modify the hydrodynamic performance characteristics of the breakwater, use of mooring lines with adequate stiffness is essential. Sannasiraj et al (1998) based on the experimental and theoretical investigations on the behavior of pontoon type floating breakwaters concluded that theoretical and experimental measurements showed good agreement. The moorings at the water surface and at the bottom of the floating breakwater yielded significantly smaller mooring forces than those obtained with crossed mooring.…”

Section: Introductionmentioning

confidence: 98%

Peak mooring forces in the horizontal interlaced multi-layered moored floating pipe breakwater

Mane¹,

Rajappa²,

Rao³

et al. 2011

International Journal of Naval Architecture and Ocean Engineeri

View full text Add to dashboard Cite

“…flexibility of future extensions, mobility, preservation of environments and economical efficiency, etc. As a result, a few investigations have proposed to improve the performance of floating breakwaters [1,2,3,5,8,11,12,14]. Of these, most numerical approaches relating to floating breakwaters have focused on developing numerical techniques that capture the fully nonlinear free-surface motion based on a grid system.…”

Section: Introductionmentioning

confidence: 99%

Numerical prediction for the performance of a floating-type breakwater by using a two-dimensional particle method

Lee¹,

Hwang²,

Nam³

et al. 2011

International Journal of Ocean System Engineering

View full text Add to dashboard Cite

The nonlinear free-surface motions interacting with a floating body were investigated using the Moving Particle Semi-implicit (MPS) method proposed by Koshizuka and Oka [6] for incompressible flow. In the numerical method, more realistic Lagrangian moving particles were used for solving the flow field instead of the Eulerian approach with a grid system. Therefore, the convection terms and time derivatives in the Navier-Stokes equation can be calculated more directly, without any numerical diffusion, instabilities, or topological failure. The MPS method was applied to a numerical simulation of predicting the efficiency of floating-type breakwater interacting with waves.

show abstract

Mooring forces and motion responses of pontoon-type floating breakwaters

Cited by 127 publications

References 4 publications

Impact of spar-nacelle-blade coupling on the edgewise response of floating offshore wind turbines

Impact of spar-nacelle-blade coupling on the edgewise response of floating offshore wind turbines

Peak mooring forces in the horizontal interlaced multi-layered moored floating pipe breakwater

Numerical prediction for the performance of a floating-type breakwater by using a two-dimensional particle method

Contact Info

Product

Resources

About