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Approach to include load sequence effects in the design of an offshore wind turbine substructure

Dragt, R.C. (author), Allaix, D.L. (author), Maljaars, J. (author), Tuitman, J.T. (author), Salman, Y. (author), Otheguy, M.E. (author)

Fatigue is one of the main design drivers for offshore wind substructures. Using Fracture Mechanics methods, load sequence effects such as crack growth retardation due to large load peaks can be included in the fatigue damage estimation. Due to the sequence dependency, a method is required that represents the sequences of loads in the design or...

conference paper 2017

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Including load sequence effects in the fatigue damage estimation of an offshore wind turbine substructure

Dragt, R.C. (author), Maljaars, J. (author), Tuitman, J.T. (author), Salman, Y. (author), Otheguy, M.E. (author)

Retardation is a load sequence effect, which causes a reduced fatigue crack growth rate after an overload is encountered. Retardation can be cancelled when the overload is followed by an underload. The net effect is beneficial to the fatigue lifetime of Offshore Wind Turbines (OWTs). To be able to take this into account, computationally...

conference paper 2016

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Interaction tools for underwater shock analysis in naval platform design

Aanhold, J.E. (author), Tuitman, J.T. (author), Trouwborst, W. (author), Vaders, J.A.A. (author)

In order to satisfy the need for good quality UNDerwater EXplosion (UNDEX) response estimates of naval platforms, TNO developed two 3D simulation tools: the Simplified Interaction Tool (SIT) and the hydro/structural code 3DCAV. Both tools are an add-on to LS-DYNA. SIT is a module of user routines for generating the UNDEX loading and accounts for...

conference paper 2016

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Generalized modes in time-domain seakeeping calculations

Tuitman, J.T. (author), Malenica, Š. (author), van 't Veer, R. (author)

The concept of "generalized modes" is to describe all degrees of freedom by mode shapes and not using any predefined shape, like rigid body modes. Generalized modes in seakeeping computations allow one to calculate the response of a single ship, springing, whipping, multibody interaction, etc., using a uniform approach. The generalized modes...

conference paper 2013

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Fatigue in high-speed aluminium craft: A design methodology for predicting the fatigue life

Tuitman, J.T. (author), Hoogendoorn, D. (author)

Within the VOMAS project, a methodology has been developed to predict the fatigue life of high-speed aluminium crafts. This paper describes this methodology and its implementation into a computational tool. This methodology computes the seakeeping and resulting pressure at the structure for all conditions within the vessel’s operational profile....

conference paper 2013

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Fatigue in high speed aluminium craft: Evaluating a design methodology for estimating the fatigue life using large scale tests and full scale trials

Drummen, I. (author), Schiere, M. (author), Tuitman, J.T. (author)

Within the VOMAS project, a methodology has been developed to estimate the fatigue life of high-speed aluminium crafts. This paper presents the large scale test and full scale trials which were done to acquire data for evaluating the developed methodology and presents results of this evaluation. During the large scale laboratory test, three...

conference paper 2013

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Local structural response to seakeeping and slamming loads

Tuitman, J.T. (author)

A common approach to investigate the response of a structural detail such as a hatch corner is to compute the seakeeping loads using a linear 3D Boundary Element Method (BEM) and transfer the seakeeping loads to a Finite Element (FE) model of the ship structure. This approach is suitable for computations of the fatigue loading of structural...

article 2013

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Generalized modes in time-domain seakeeping calculations

Tuitman, J.T. (author), Malenica, S. (author), van 't Veer, R. (author)

The concept of "generalized modes" is to describe all degrees of freedom by mode shapes and not using any predefined shape, like rigid body modes. Generalized modes in seakeeping computations allow one to calculate the response of a single ship, springing, whipping, multibody interaction, etc., using a uniform approach. The generalized modes...

article 2012

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Validation of hydro-elastic whipping prediction using full scale measurements

Tuitman, J.T. (author)

conference paper 2012

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Global hydroelastic ship response comparison of numerical model and WILS model tests

Bigot, F. (author), Derbanne, Q. (author), Sireta, F.X. (author), Malenica, S. (author), Tuitman, J.T. (author)

It is nowadays well recognized that the hydroelastic ship response might be an important part of the overall ship structural response. We usually talk about two phenomena: namely springing and whipping, even if sometimes it is not trivial to distinguish between the two of them. Usually, springing is defined as a continuous resonant wave-induced...

conference paper 2011

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Local structural response by slamming

Tuitman, J.T. (author)

conference paper 2010

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Hydro-elastic response of ship structures to slamming induced whipping

Tuitman, J.T. (author), TNO Bouw en Ondergrond (author)

public lecture 2010

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Validation of the global hydroelastic model for springing & whipping of ships

Derbanne, Q. (author), Malenica, Š. (author), Tuitman, J.T. (author), Bigot, F. (author), Chen, X.B. (author), TNO Bouw en Ondergrond (author)

Hydroelastic response of the ship can represent an important part of the overall structural response. This is true both for the extreme ship structural response as well as for the fatigue loads of some structural details. Several full scale monitoring campaigns on the container ships clearly show an important high frequency contribution coming...

conference paper 2010

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Slamming and whipping. Extra belasting van de scheepsconstructie

Tuitman, J.T. (author), TNO Bouw en Ondergrond (author)

article 2010

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Hydro-elastic response of ship structures to slamming induced whipping

TNO Bouw en Ondergrond (author), Tuitman, J.T. (author)

doctoral thesis 2010

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Transfer of non-linear seakeeping loads to FEM model using quasi static approach

Tuitman, J.T. (author), Bosman, T.N. (author), TNO Bouw en Ondergrond (author)

conference paper 2009

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Fully coupled seakeeping, slamming and whipping calculations

Tuitman, J.T. (author), Malenica, S. (author), TNO Bouw en Ondergrond (author)

article 2009

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Local hydro-structure interactions due to slamming

Malenica, S. (author), Sireta, F.X. (author), TomaŠević, S. (author), Tuitman, J.T. (author), Schipperen, I. (author), TNO Bouw en Ondergrond (author)

It is fair to say that the general seakeeping problem of ship advancing with arbitrary forward speed in rough waves is still a challenge and no fully satisfactory numerical model exists up to now. Indeed physics involved in this problem is extremely complex and includes many different physical phenomena which can not be handled by a single...

conference paper 2009

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Some aspects of whipping response of container ships

Tuitman, J.T. (author), TNO Bouw en Ondergrond (author)

conference paper 2008

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3DFEM-3DBEM model for springing and whipping analysis of ships

Malenica, S. (author), Tuitman, J.T. (author), TNO Bouw en Ondergrond (author)

The paper deals with the modeling of the wave induced ship structural vibrations. The presented method is fully integrated in both the linear frequency domain and non-linear time domain seakeeping calculations. Due to the transient non-linear nature of slamming loading, the corresponding whipping response is calculated in the time domain only,...

conference paper 2008