References of "Le Sourne, Hervé"
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See detailAnalytical method to assess the crashworthiness of a Floating Offshore Wind Turbine (FOWT)
Echeverry Jaramillo, Sara ULiege; Le Sourne, Hervé; Rigo, Philippe ULiege

Poster (2017, December 04)

With the purpose of using more renewable energies and the decarbonisation of EU, some European countries are implementing floating wind farms, which are closer to traffic lanes. It is important to have a ... [more ▼]

With the purpose of using more renewable energies and the decarbonisation of EU, some European countries are implementing floating wind farms, which are closer to traffic lanes. It is important to have a complete scope of the structure’s response to a ship impact, in order to implement a risk assessment of the floating wind turbines. In this regard, finite elements solvers are widely used nowadays, which provide accurate results but are time-demanding, not suitable for an early design stage. A faster and reliable method is required in order to study a wide range of parameters: impact velocity, impact location, wind-wave-structure interaction, mooring system response and overall dynamics. This poster presents the methodology used to develop an analytical method to compute the crashworthiness of FOWT. [less ▲]

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See detailShip collision analysis on Offshore Wind Turbines with monopile foundations
Bela, Andreea ULiege; Le Sourne, Hervé; Rigo, Philippe ULiege

Poster (2017, December 04)

Every year the offshore wind industry is expanding and new offshore wind farms are built in deeper waters and closer to the traffic lanes for commercial and passenger ships leading to possible collision ... [more ▼]

Every year the offshore wind industry is expanding and new offshore wind farms are built in deeper waters and closer to the traffic lanes for commercial and passenger ships leading to possible collision events. The consequences of such events can range from minor structural damage to collapse of the Offshore Wind Turbine (OWT), with probability of ship sinking, pollution and at worst, to loss of human lives. Therefore, a collision risk analysis becomes a necessity in the pre-design stage of an offshore wind farm in order to identify the collision scenarios having the greatest probabilities of occurrence but also the most dangerous ones. The objective of this research is to investigate numerically the influence of the impact velocity and wind loads on the OWT’s behaviour when subjected to ship impact. A 5 MW wind turbine was considered for this research and the striking ship was conservatively assumed to be rigid. The description of the Finite Element model is presented as well as the main results obtained. [less ▲]

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See detailDesign methods to assess the resistance of Offshore wind Turbine Structures impacted by a ship
Echeverry Jaramillo, Sara ULiege; Le Sourne, Hervé; Bela, Andreea ULiege et al

Conference (2017, July 07)

The dynamic modes of jacket, monopile and Floating offshore wind turbines (FOWT) after a collision event are presented. The authors have developed simplified analytical formulations based on plastic limit ... [more ▼]

The dynamic modes of jacket, monopile and Floating offshore wind turbines (FOWT) after a collision event are presented. The authors have developed simplified analytical formulations based on plastic limit analysis to assess the resistance of an offshore wind turbine jacket impacted by a ship. For the case of collisions with monopile foundations and FOWT, the crushing behavior and structure dynamics are studied by means of finite element simulations. Numerical results for both monopile and floating structures will serve for further developments of simplified analytical tools, similar to that used for jacket structures. [less ▲]

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See detailValidation of a simplfied method for the crashworthiness of offshore wind turbine jackets using finite elements simulations
Pire, Timothée ULiege; Echeverry Jaramillo, Sara ULiege; Rigo, Philippe ULiege et al

in Guedes Soares, Carlos; Garbatov, Yordan (Eds.) Progress in the Analysis and Design of Marine Structures (2017, May 08)

The work presented in this paper focuses on crashworthiness of jacket foundations used to support offshore wind turbines in moderately deep waters. In a previous research work, the authors have developed ... [more ▼]

The work presented in this paper focuses on crashworthiness of jacket foundations used to support offshore wind turbines in moderately deep waters. In a previous research work, the authors have developed a solver based on analytical formulations, derived from limit plastic analysis, to assess the damage of such foundations when impacted by a ship. The present paper describes the methodology followed to perform numerical validations of the theoretical developments, including a description of the finite element models, the computation hypotheses and the simulations performed using LS-DYNA code. Many parameters describing the collision scenario are investigated, namely the type, the mass, the initial velocity and the trajectory of the striking ship. Some comparisons between analytical and numerical results are finally shown. [less ▲]

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See detailInvestigation of the added mass method for seismic design of lock gates
Buldgen, Loïc ULiege; Le Sourne, Hervé; Caprace, Jean-David ULiege et al

in Engineering Structures (2017)

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See detailShip collision analysis on Offshore Wind Turbine monopile foundations
Bela, Andreea ULiege; Le Sourne, Hervé; Buldgen, Loïc ULiege et al

in Marine Structures (2017), 51

An offshore wind farm covers a large maritime area and the site can be located close to traffic lanes of commercial and passenger ships, which may lead to possible collision events. The work presented in ... [more ▼]

An offshore wind farm covers a large maritime area and the site can be located close to traffic lanes of commercial and passenger ships, which may lead to possible collision events. The work presented in this paper aimed to understand both the crushing behavior and the nacelle dynamics of a predefined monopile offshore wind turbine when impacted by a ship. Another objective was to deeply investigate the influence of various parameters like ship impact velocity and location, wind direction, soil stiffness and deformability of the striking ship. First, nonlinear numerical simulations of ship - Offshore Wind Turbine (OWT) collisions have been carried out with a rigid striking ship for a better understanding of the OWT’s structural behaviour during collision. Different configurations for the wind turbine’s structure have been used in order to highlight the modifications in behaviour induced by changing the soil conditions or the loading scenario. The resulting resistant force and internal energies have been compared as well as the tower top (nacelle) displacements and accelerations. Then, another series of simulations have been performed with a deformable ship in order to investigate the influence of the deformability of the striking ship on the OWT’s behaviour. It is worth noting that all these numerical results will further serve to fix the hypotheses for the development of a simplified tool based on analytical formulations. [less ▲]

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See detailPresentation of an algorithm to assess the crashworthiness of an offshore wind turbine jacket using analytical formulations
Pire, Timothée ULiege; Le Sourne, Hervé; Rigo, Philippe ULiege

Poster (2016, December 05)

In a context of ecological issues, renewable energy systems are developed and enhanced and, amongst them, offshore wind energy. Many wind farm projects will be carried out in the near future and their ... [more ▼]

In a context of ecological issues, renewable energy systems are developed and enhanced and, amongst them, offshore wind energy. Many wind farm projects will be carried out in the near future and their locations are closer and closer to traffic lanes. For safety, ecologic or economic reasons, it is required to perform a collision risk analysis for each new offshore structure. Finite elements softwares, widely used actually, provide accurate results but are time-demanding and not suitable for a first design stage. A faster analytical method, based on the plastic limit analysis, is developed by the authors to compute the resistance of an offshore wind turbine jacket when collided by a ship. This poster presents the methodology used to develop an analytical method to compute the crashworthiness of jackets. Then, some results are given and compared to numerical simulations to validate the model. [less ▲]

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See detailInvestigation of bulbous bow resistance during oblique collisions against tubes or plane walls
Buldgen, Loïc ULiege; Le Sourne, Hervé; Berthonneau, Pierre

in Proceedings of the International Conference on Ships and Offshore Structures (2016, September 02)

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See detailAnalytical developments to assess the crashworthiness of an offshore wind turbine jacket impacted by a ship
Pire, Timothée ULiege; Le Sourne, Hervé; Buldgen, Loïc ULiege et al

Poster (2015, December 10)

As the number of offshore wind farms is constantly increasing, impacts between ships and wind turbines is becoming a major concern. Nowadays, design offices use finite elements simulations to assess the ... [more ▼]

As the number of offshore wind farms is constantly increasing, impacts between ships and wind turbines is becoming a major concern. Nowadays, design offices use finite elements simulations to assess the crashworthiness of offshore supporting structures, which give accurate results but is time demanding. There is therefore a need for a faster method, especially during the pre-design stage. The purpose of this research is to develop analytical formulations, based on the so-called continuous elements method in order to compute the resistance of offshore wind turbine jackets when submitted to an impact. [less ▲]

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See detailPresentation of a simplified method for the crashworthiness of offshore wind turbine jackets
Pire, Timothée ULiege; Le Sourne, Hervé; Buldgen, Loïc ULiege et al

Conference (2015, October 13)

More and more offshore wind farms will be built in a near future and it is mandatory to perform for every new project a collision risk analysis. Actually, this is done by using finite elements software ... [more ▼]

More and more offshore wind farms will be built in a near future and it is mandatory to perform for every new project a collision risk analysis. Actually, this is done by using finite elements software, which is time consuming and not suitable for pre-design stage. The presentation show analytical developments performed in order to assess the crashworthiness of an offshore wind turbine jacket quickly. [less ▲]

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See detailReview of existing solutions and presentation of a simplified method for the crashworthiness of lock gates
Buldgen, Loïc ULiege; Ehlers, Sören; Le Sourne, Hervé et al

in Proceedings of the Smart Rivers 2015 Conference (2015, September)

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See detailA simplified analytical method to evaluate the seismic pressure on plane lock gates
Buldgen, Loïc ULiege; Rigo, Philippe ULiege; Le Sourne, Hervé

in Engineering Structures (2015), 100

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See detailA simplified analytical method to estimate the resistance of plane lock gates impacted by river barges
Buldgen, Loïc ULiege; Le Sourne, Hervé; Rigo, Philippe ULiege

in Marine Structures (2015), 43

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See detailNumerical crashworthiness analysis of an offshore wind turbine monopile impacted by a ship
Bela, Andreea ULiege; Le Sourne, Hervé; Buldgen, Loïc ULiege et al

in Shenoi, R Ajit; Soares, Carlos Guedes (Eds.) Analysis and Design of Marine Structures (2015, March)

The consequences of collision events can range from minor structural damages of the supporting structure to complete collapse of the wind turbine, which may lead to disruptions of the electricity ... [more ▼]

The consequences of collision events can range from minor structural damages of the supporting structure to complete collapse of the wind turbine, which may lead to disruptions of the electricity production and, at worst, to sinking of the striking ship with probability of loss of human lives or/and pollution. For all these reasons, a collision risk analysis becomes mandatory at the pre-design stage in order to identify the collision scenarios having the greatest probabilities of occurrence, to estimate the consequences of collision events and to ensure safe operations through the wind farm service life. The goal of this paper is to outline the behavior of the monopile foundations during ship collision by performing non-linear finite element simulations. Many collision scenarios are analyzed in order to study the sensitivity of the monopile to various parameters like impact striking ship velocity, nacelle mass, wind direction, soil stiffness, vertical location of the impact point, wind orientation … The internal energy dissipated by deformation of the monopile, the crushing force and the indentation of the crushed area are compared for different situations, as well as the overall displacements of the supporting structure. [less ▲]

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See detailShip collision on monopile offshore wind turbines
Bela, Andreea ULiege; Le Sourne, Hervé; Buldgen, Loïc ULiege et al

Poster (2015)

Every year, the offshore wind industry is expanding and the location of the future wind farms tends to move to deeper waters and closer to the traffic lanes. The consequence of this growth is that the ... [more ▼]

Every year, the offshore wind industry is expanding and the location of the future wind farms tends to move to deeper waters and closer to the traffic lanes. The consequence of this growth is that the probability of ship collisions will increase. For any new offshore wind farm projects, a collision risk analysis must be performed in order to identify the collision scenarios having the greatest probabilities of occurrence and to evaluate the consequences on the supporting structure and also on the mechanical parts of the wind turbines. The goal of this paper is to outline the behaviour of the monopile foundations during ship collision by performing non-linear finite elements simulations. Many collision scenarios are analysed in order to study the sensitivity of the monopile to a series of parameters like impact velocity of the striking ship, wind loads and soil stiffness. [less ▲]

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See detailSHIP COLLISION ON LOCK GATES – TECHNICAL SOLUTIONS AND SIMULATION APPROACHES
Ehlers, Sören; Le Sourne, Hervé; Buldgen, Loïc ULiege et al

in Proceedings of the ICTWS 2014 7th International Conference on Thin-Walled Structures, Busan 28th September - 02 October 2014 (2014, September)

A ship colliding with a lock gate can result in severe structural damage and disrupt the lock operations. For heavily trafficked waterways containing locks such disruption of the lock operation can result ... [more ▼]

A ship colliding with a lock gate can result in severe structural damage and disrupt the lock operations. For heavily trafficked waterways containing locks such disruption of the lock operation can result in severe economic consequences if the gate has to be repaired, both for the lock operator and for the delayed ships. Consequently, the consequences of a ship colliding with a lock gate must be assessed. Therefore, this paper will present current regulatory requirements and recommendations including gate protection systems. Furthermore, simulation methods will be presented to allow for a direct assessment of the structural consequences. Thus, these methods will potentially lead to new structural design considerations as well as operational limitations in terms of specific ship approach velocities to remain below critical impact energies and thus allow for an undisrupted lock operation. [less ▲]

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See detailA SIMPLIFIED PROCEDURE TO ASSESS THE DYNAMIC PRESSURES ON LOCK GATES
Buldgen, Loïc ULiege; Gazerzadeh, Afshin; Bela, Andreea ULiege et al

in Proceedings of the ICTWS 2014 7th International Conference on Thin-Walled Structures, Busan 28th September - 02 October 2014 (2014, September)

The paper is concerned with the seismic design of lock gates. During an earthquake, it is evident that the liquid contained in the lock chamber is responsible for an additional hydrodynamic pressure ... [more ▼]

The paper is concerned with the seismic design of lock gates. During an earthquake, it is evident that the liquid contained in the lock chamber is responsible for an additional hydrodynamic pressure acting on the structure. This one is known to have three different contributions, which are respectively called the convective, rigid and flexible impulsive parts. The two first ones have already been extensively studied in the literature and are quite easy to evaluate. Nevertheless, characterizing the flexible contribution is more difficult, as it is largely influenced by the coupling occurring between the fluid and the gate. The only relevant way to overcome this difficulty seems to resort to finite elements software, which is not always convenient. Therefore, some research have been undertaken to provide a rapid meshless method leading to an approximation of the flexible pressure on lock gates. As detailed in the present paper, this is achieved by applying an analytical approach based on the virtual work principle. As a matter of validation, the results obtained analytically are compared to numerical solutions. The agreement between both of them is found to be satisfactory. [less ▲]

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See detailA Simplified procedure to assess the dynamic pressures on large reservoirs
Buldgen, Loïc ULiege; Degée, Hervé ULiege; Le Sourne, Hervé et al

in Proceedings of the 9th International Conference on Structural Dynamics - EURODYN 2014 (2014)

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See detailExtension of the Super-Elements to the Analysis of a Jacket Impacted by a Ship
Buldgen, Loïc ULiege; Le Sourne, Hervé; Pire, Timothée ULiege

in Marine Structures (2014)

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See detailA Rapid Procedure for Estimating the Ability of Lock Gates to Withstand Ship Collisions
Buldgen, Loïc ULiege; Le Sourne, Hervé; Rigo, Philippe ULiege

in Proceedings of the PIANC Smart Rivers 2013 Conference (2013, October)

Detailed reference viewed: 53 (16 ULiège)