Loads for use in the design of ships and offshore structures

Hirdaris, Spyros; Bai, Wei; Dessi, Daniele; Ergin, Ahmet; Gu, Xinjian; Hermundstad, Ole Andreas; Huijsmans, R.H.M.; Iijima, Kazuhiro; Nielsen, Ulrik Dam; Parunov, Joško; Fonseca, Nuno; Papanikolaou, Apostolos; Argyriadis, Kimon; Incecik, Atilla

doi:10.1016/j.oceaneng.2013.09.012

Cited by 267 publications

(108 citation statements)

References 194 publications

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“…Subsequently, there has been a significant change in the class rule formulations, wherein the requirements are specified by various formulae for environmental loads and allowable stresses based on simple principles of structural mechanics. Over the years the classification societies have been providing the necessary standards to ensure the adequacy of strength against all demands that can be envisaged during service life of the ship [4][5][6][7].…”

Section: Literature Reviewmentioning

confidence: 99%

Structural analysis of a ship on global aspect using ANSYS

Rahman¹,

Kamol²,

Islam³

2017

AIP Conference Proceedings

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Abstract. Ship is a complex geometry which undergoes a combination of loadings such as hydrostatic, hydrodynamic, wind, wave etc. at sea and thus adequate strength in a ship has always been one of the most challenging tasks for the ship designers. International Maritime Organization (IMO) and classification societies are providing the standards to ensure the adequacy of strength for the ship against all demands throughout its service life. Thus, structural analysis is needed to assess the overall strength of hull, and the means in this regard are based on finite element method which may be applied either local or global aspect of the ship. This paper is an attempt to carry out the structural analysis of a ship in global aspect using ANSYS software to locate the most stress concentration and deformed area, which will have ultimate effect on fatigue fracture.

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Section: Literature Reviewmentioning

confidence: 99%

Structural analysis of a ship on global aspect using ANSYS

Rahman¹,

Kamol²,

Islam³

2017

AIP Conference Proceedings

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“…However, restricted by the conditions of scientific research, the content of this paper is based on the following fundamental assumptions. Mechanical characteristics of deep water riser like that of the tender bar are with the top and the bottom boundary conditions [15]. …”

Section: Mathematical Model Of Transverse Vibration Of the Riser In Dmentioning

confidence: 99%

Transverse Vibration Analysis of the Riser in Deep Water

Li¹,

Wang²,

Zhao³

et al. 2015

TOPEJ

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With high international oil price, the exhaustion of onshore resources and declination of oil and gas production in shallow sea, deep water has become the important succeeding area of worldwide oil and gas. During deepwater oil and gas development, riser must be used to isolate seawater, circulate drilling fluid, and compensate the heaving movements of the string and so on. However, with the operating water depth increasing, the loads of waves and ocean currents on the riser become more complex, leading to extremely high construction risk and funds risk of deep-water operations. In this paper, considering the combined action of inside and outside fluid on the riser, transverse vibration partial differential equation is derived, and solved with finite difference method. Meanwhile, transverse displacement response of the riser acted by outer load is determined, and the shear force, bending moment and bend angle at different locations are solved, then the influence factors of riser transverse vibration are analyzed. The mechanical analysis of marine riser can provide a theoretical guidance for safe and effective drilling work, which is of great significance for the offshore oil and gas development.

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“…However, it is essential that the offshore turbine towers are designed for severe environmental conditions. Wind is considered as design force for onshore structures [5] while wave force is dominant in the offshore environment [6]. Approximately, 70% of the total environmental forces is composed of wave and current forces affecting the dynamic response [7].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Offshore Wind Turbine Tower Dynamics with Numerical Analysis

Dağlı

Tuskan

Gökkuş

2018

Advances in Civil Engineering

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A dynamic behaviour of a cylindirical wind tower with variable cross section is investigated under environmental and earthquake forces.e ground acceleration term is represented by a simple cosine function to investigate both normal and parallel components of the earthquake motions located near ground surface. e function of earthquake force is simplified to apply Rayleigh's energy method. Wind forces acting on above the water level and wave forces acting on below this level are utilized in computations considering earthquake effect for entire structure. e wind force is divided into two groups: the force acting on the tower and the forces acting on the rotor nacelle assembly (RNA). e drag and the inertial wave forces are calculated with water particle velocities and accelerations due to linear wave theory. e resulting hydrodynamic wave force on the tower in an unsteady viscous flow is determined using the Morison equation. e displacement function of the physical system in which dynamic analysis is performed by Rayleigh's energy method is obtained by the single degree of freedom (SDOF) model. e equation of motion is solved by the fourth-order Runge-Kutta method. e two-way FSI (fluid-structure interaction) technique was used to determine the accuracy of the numerical analysis. e results of computational fluid dynamics and structural mechanics are coupled in FSI analysis by using ANSYS software. Time-varying lateral displacements and the first natural frequency values which are obtained from Rayleigh's energy method and FSI technique are compared. e results are presented by graphs. It is observed from these graphs that the Rayleigh model can be an alternative way at the prelimanary stage of the structural analysis with acceptable accuracy.

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Loads for use in the design of ships and offshore structures

Cited by 267 publications

References 194 publications

Structural analysis of a ship on global aspect using ANSYS

Structural analysis of a ship on global aspect using ANSYS

Transverse Vibration Analysis of the Riser in Deep Water

Evaluation of Offshore Wind Turbine Tower Dynamics with Numerical Analysis

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