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Atzampou, P. (author), Meijers, P.C. (author), Tsouvalas, A. (author), Metrikine, A. (author)Current offshore wind turbine installation and positioning methods require mechanical equipment attached on the lifted components and human intervention. The present paper studies the development of a contactless motion compensation technique by investigating a magnetically controlled pendulum. The technique involves the interaction of a...journal article 2024
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Molenkamp, T. (author), Tsouvalas, A. (author), Metrikine, A. (author)Offshore wind energy holds significant promise as a solution in the energy transition. However, installing offshore pile foundations can generate substantial levels of underwater noise, posing potential risks to marine life. This paper examines the influence of asymmetric impact forces and pile inclination on producing underwater noise and...journal article 2024
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Molenkamp, T. (author), Tsetas, A. (author), Tsouvalas, A. (author), Metrikine, A. (author)Vibratory offshore pile driving offers a potential solution for reducing the underwater noise generated during the installation of foundation piles compared to using impact hammers. Existing noise prediction models are specifically tailored to impact pile driving scenarios. This paper introduces a novel methodology for underwater noise...journal article 2024
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Molenkamp, T. (author), Tsouvalas, A. (author), Metrikine, A. (author)The growing interest in offshore wind leads to an increasing number of wind farms planned to be constructed in the coming years. Installation of these piles often causes high underwater noise levels that harm aquatic life. State-of-the-art models have problems predicting the noise and seabed vibrations from vibratory pile driving. A significant...journal article 2023
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Peng, Y. (author), Jarquin Laguna, A. (author), Tsouvalas, A. (author)Underwater noise from offshore pile driving has raised significant concerns over its ecological impact on marine life. To protect the marine environment and maintain the sustainable development of wind energy, strict governmental regulations are imposed. Assessment and mitigation of underwater noise are usually required to ensure that sound...journal article 2023
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Tsetas, A. (author), Tsouvalas, A. (author), Metrikine, A. (author)This paper presents a computationally efficient model for vibratory pile installation. A semi-analytical finite element (SAFE) model for thin cylindrical shells is derived to represent the pile. The linear dynamic response of the soil medium is described by means of Green's functions via the Thin-Layer Method (TLM) coupled with Perfectly...journal article 2023
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Tsetas, A. (author), Tsouvalas, A. (author), Metrikine, A. (author)Gentle Driving of Piles (GDP) is a new vibratory installation technology for tubular (mono)piles. It is characterized by the simultaneous application of low-frequency axial and high-frequency torsional vibrations, envisaged to achieve both high installation performance and reduced underwater noise emissions. The concept of GDP has been...journal article 2023
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Kementzetzidis, Evangelos (author), Pisano, F. (author), Elkadi, A.S.K. (author), Tsouvalas, A. (author), Metrikine, A. (author)Gentle Driving of Piles (GDP) is a new technology for the vibratory installation of tubular (mono)piles. Its founding principle is that both efficient installation and low noise emission can be achieved by applying to the pile a combination of axial and torsional vibrations. Preliminary development and demonstration of the proposed technology...journal article 2023
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Tsetas, A. (author), Tsouvalas, A. (author), Sánchez Gómez, S. (author), Pisano, F. (author), Kementzetzidis, Evangelos (author), Molenkamp, T. (author), Elkadi, A.S.K. (author), Metrikine, A. (author)Gentle Driving of Piles (GDP) is a new technology for the vibratory installation of tubular (mono)piles. Its founding principle is that both efficient installation and low noise emission can be achieved by applying to the pile a combination of axial and torsional vibrations. Preliminary development and demonstration of the proposed technology...journal article 2023
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Tsetas, A. (author), Tsouvalas, A. (author), Molenkamp, T. (author), Metrikine, A. (author)In the original publication, Eqs. (11) and (17) are published incorrectly, and this has been corrected as follows: (Formula presented.) The original article has been revised.journal article 2022
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Dostal, Leo (author), Hollm, Marten (author), Metrikine, A. (author), Tsouvalas, A. (author), van Dalen, K.N. (author)This paper aims at investigating the existence of localized stationary waves in the shallow subsurface whose constitutive behavior is governed by the hyperbolic model, implying non-polynomial nonlinearity and strain-dependent shear modulus. To this end, we derive a novel equation of motion for a nonlinear gradient elasticity model, where the...journal article 2022
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Tsetas, A. (author), Tsouvalas, A. (author), Molenkamp, T. (author), Metrikine, A. (author)This paper presents a computationally efficient mode-matching method to predict the relative axial motion of two elastic rods in frictional contact. The motion is of the stick-slip type and is non-uniform along the rods. The proposed method utilizes the piecewise linearity of the problem in time and space. The original set of nonlinear...journal article 2022
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Meijers, P.C. (author), Jolink, C. T. (author), Tsouvalas, A. (author), Metrikine, A. (author)To study the irreversible changes in the magnetic stray field surrounding a steel structure caused by impact-induced elastic and plastic deformations, a steel cylinder was repeatedly subjected to axial impacts of various magnitudes. Due to impacts that induce elastic deformation, the measured magnetic stray field of the structure converges to...journal article 2022
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Meijers, P.C. (author), Tsouvalas, A. (author), Metrikine, A. (author)This paper reports on a measurement campaign in which the magnetomechanical response of a steel monopile is recorded during installation with a hydraulic impact hammer. By comparing impact-induced changes in the magnetic stray field of the structure to the measured strain, this effect is analysed for the first time under dynamic loading...journal article 2021
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Tsetas, A. (author), Tsouvalas, A. (author), Metrikine, A. (author)During the last decade the offshore wind industry grew ceaselessly and engineering challenges continuously arose in that area. Installation of foundation piles, known as monopiles, is one of the most critical phases in the construction of offshore wind farms. Prior to installation a drivability study is performed, by means of pile driving...journal article 2021
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Peng, Y. (author), Tsouvalas, A. (author), Stampoultzoglou, Tasos (author), Metrikine, A. (author)Underwater noise pollution generated by offshore pile driving has raised serious concerns over the ecological impact on marine life. To comply with the strict governmental regulations on the threshold levels of underwater noise, bubble curtains are usually applied in practice. This paper examines the effectiveness of an air bubble curtain...journal article 2021
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Peng, Y. (author), Tsouvalas, A. (author), Stampoultzoglou, Tasos (author), Metrikine, A. (author)This paper presents a computationally efficient modeling approach for predicting underwater noise radiation from offshore pile driving. The complete noise prediction model comprises two modules. First, a sound generation module is adopted to capture the interaction between the pile, the fluid, and the seabed, aiming at modeling the sound...journal article 2021
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Tieleman, Orson (author), Hofland, Bas (author), Tsouvalas, A. (author), de Almeida Sousa, E. (author), Jonkman, Sebastiaan N. (author)This paper establishes a computationally efficient model to predict flood gate vibrations due to wave impacts including fluid–structure interaction. In contrast to earlier models, composite fluid domains are included to represent the situation of a flood gate in a dewatering sluice with the presence of an overhang that causes the confined-wave...journal article 2021
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Lu, T. (author), Tsouvalas, A. (author), Metrikine, A. (author)The in-plane steady-state response of a rotating ring on elastic foundation subjected to a stationary load is investigated theoretically using a high-order model in the framework of the plane strain assumption. The adopted high-order model accounts for the through-thickness variation of stresses and displacements, as well as the boundary...journal article 2020
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Tieleman, Orson (author), Tsouvalas, A. (author), Hofland, Bas (author), Peng, Y. (author), Jonkman, Sebastiaan N. (author)A model is developed to predict bending vibrations of flood gates with fluid on both sides. The liquid flow is three-dimensional and the gate is represented as a thin plate. The fluid response is considered within the linear potential flow theory including the effect of compressibility and the generation of free surface waves. This way, the...journal article 2019
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