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Jain, A. (author), van Dalen, K.N. (author), Metrikine, A. (author), Faragau, Andrei B. (author), Steenbergen, M.J.M.M. (author)ransition zones in railway tracks experience strong amplification of stress and strain fields due to the passage of train over inhomogeneity. The inhomogeneity in these zones can be attributed to changes in mechanical properties of material along the longitudinal direction of the track, and to displacement/traction discontinuities at interfaces...conference paper 2023
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Maya, P. (author), Alday Gonzalez, M.F. (author), Metrikine, A. (author), Lavidas, G. (author)Climate change is expected to have an impact on wind patterns, and therefore the generation of waves. Phase 6 of the Coupled Model Intercomparison Project (CMIP6), provides various realization of outputs integrated global coupled models for different centuries. Wind quality is a cornerstone for wave energy as it is the primary generation driver...conference paper 2023
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Raghavan, V. (author), Simonetti, Irene (author), Lavidas, G. (author), Metrikine, A. (author), Cappietti, Lorenzo (author)Utilization of Boundary Element Method (BEM) based on linear potential flow for modelling Oscillating Water Column (OWC) devices has gained popularity in the last two decades. The commercial BEM solver WAMIT has been used widely for modelling OWCs and validated using experimental modelling (Delauré et. al. 2003, Bingham et. al. 2015, Faÿ 2020)....conference paper 2023
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Faragau, Andrei B. (author), Jain, A. (author), de Oliveira Barbosa, J.M. (author), Metrikine, A. (author), van Dalen, K.N. (author)This paper studies the effectiveness of adding auxiliary rails as a mitigation measure for degradation in transition zones of railway tracks. More specifically, it investigates the settlement mechanisms counteracted by the additional rails. Results show that when the system’s response is in the quasi-static regime, adding auxiliary rails over...conference paper 2023
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Tsetas, A. (author), Tsouvalas, A. (author), Metrikine, A. (author)In this paper, the characteristics of the induced ground motion are studied for two pile installation methods. Specifically, the classical axial vibratory driving is compared with the Gentle Driving of Piles (GDP) method, to investigate the effect of high-frequency torsional excitation in the soil response. For that purpose, a non-linear 3-D...conference paper 2023
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Sánchez Gómez, S. (author), Tsetas, A. (author), Tsouvalas, A. (author), Metrikine, A. (author)For offshore wind turbines (OWTs), the monopile comprises the most common type of foundation and vibratory driving is one of the main techniques for monopile installation (and decommissioning). In practice, prior to pile installation, a pile driving analysis is performed to select the appropriate installation device and the relevant settings....conference paper 2023
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Saeidtehrani, S. (author), Lavidas, G. (author), Metrikine, A. (author)The process of finding values of extreme waves and their impacts on wave energy converter (WEC) responses, depends on both wave resources and WEC dynamic characteristics. A wide range of waves can influence the reliability of operation and survivability of a WEC. In this paper, a methodology is described to find specific values of wave heights...conference paper 2022
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Tsetas, A. (author), Tsouvalas, A. (author), Metrikine, A. (author)The Alternating Frequency-Time (AFT) Harmonic Balance method has been widely applied in the analysis of non-linear mechanical systems under periodic excitation. Customarily, a periodic displacement is considered as ansatz in a harmonic balance analysis. In the present work, a deviation from the latter ansatz is realized and the periodicity is...conference paper 2022
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Faragau, Andrei B. (author), Metrikine, A. (author), van Dalen, K.N. (author)Hyperloop is an emerging high-speed transportation system in which air resistance is minimised by having the vehicle travel inside a de-pressurised tube supported by columns. This design leads to a strong periodic variation of the stiffness (among other parameters) experienced by the vehicle. Also, along its route, the Hyperloop will encounter...conference paper 2022
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Saeidtehrani, S. (author), Cabboi, A. (author), Lavidas, G. (author), Metrikine, A. (author)Faults in complex systems such as Wave Energy Converters (WECs) are inevitable. WECs are expected to work in harsh environments to produce more power which increases the possibility of major failures. Increasing the reliability of WECs calls for the development of early Fault Detection (FD) algorithms which needs understanding of the enormous...conference paper 2022
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Raghavan, V. (author), Lavidas, G. (author), Metrikine, A. (author), Mantadakis, Nikolaos (author), Loukogeorgaki, Eva (author)Wave Energy Converters (WECs) are expected to significantly contribute to the energy transition; however, this depends on their interactions with the resource. Calculating the power generated by WECs depends heavily on the accurate modelling of wave-structure interactions. The Boundary Element Method (BEM) based on the potential flow theory has...conference paper 2022
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Tsouvalas, A. (author), Peng, Y. (author), Metrikine, A. (author)The prediction of underwater noise and the assessment of the influencing factors on noise transmission are significant for the control and mitigation of the noise generated by offshore pile driving. This paper presents a coupled two-step approach for modelling the underwater noise from offshore pile driving, with the focus being placed on...conference paper 2021
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Molenkamp, T. (author), Tsetas, A. (author), Tsouvalas, A. (author), Metrikine, A. (author)In this paper, a new model is developed to describe the nonlinear dynamics of twoaxially deformable bars sliding relative to each other in which the interaction is governed byfriction. The first bar is fixed at one end and is subjected to a distributed normal force perpen-dicular to its axis to activate friction at the common interface, while...conference paper 2020
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Lu, T. (author), Tsouvalas, A. (author), Metrikine, A. (author)Ring-like structures are very commonly used in civil, mechanical and aerospace engineering. Typical examples of such structures are components in turbomachinery, compliant gears, conventional pneumatic tires and more recent non-pneumatic tires, to name a few. In this paper, a ring on elastic foundation is considered. The foundation, modelled as...conference paper 2020
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Meijers, P.C. (author), Tsouvalas, A. (author), Metrikine, A. (author)Current methods to infer the penetration of a steel monopile during an offshore installation are rather inaccurate. Since a large number of foundation piles will be installed offshore in the coming years, a reliable technique to infer the penetration depth is vital. This paper proposes a non-contact method to monitor the pile progression into...conference paper 2020
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Tsetas, A. (author), Sánchez Gómez, S. (author), Tsouvalas, A. (author), van Beek, C. (author), Sadeghi Tehrani, F. (author), Kementzetzidis, E. (author), Pisano, F. (author), Elkadi, A.S.K. (author), Segeren, M.L.A. (author), Molenkamp, T. (author), Metrikine, A. (author)A novel pile-driving technique, named Gentle Driving of Piles (GDP), that combines axial low-frequency and torsional high-frequency vibrations has been developed and tested recently. During the experimental campaign, several piles were installed onshore, making use of the GDP shaker. Besides those, a number of additional piles were installed...conference paper 2020
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Peng, Y. (author), Tsouvalas, A. (author), Metrikine, A. (author)This paper presents a computationally efficient modelling approach for the prediction of underwater noise radiation from offshore pile driving. A near-source module is adopted to capture the interaction between the pile, fluid and soil, which is based on a previously developed semi-analytical vibro-acoustic model. This module primarily aims...conference paper 2020
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Tsouvalas, A. (author), Molenkamp, T. (author), Canny, Khairina (author), Kroon, D.P. (author), Versluis, Marco (author), Peng, Y. (author), Metrikine, A. (author)The paper establishes a computationally inexpensive method to deal with the dynamic response of liquid storage tanks subjected to seismic excitation including dynamic soil-structure interaction. The tank is modelled as a thin shell, the stored liquid is described asan inviscid and incompressible fluid and the soil medium is modelled as an...conference paper 2020
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Tsouvalas, A. (author), Peng, Y. (author), Metrikine, A. (author)In this paper, a pile-water-soil model is developed for the prediction of sound generated due to impact piling. The complete model consists of two modules: i) a near-source module aiming at the accurate description of the pile-water-soil interaction together with the sound generation and propagation in the vicinity of the pile; and ii) a far...conference paper 2019
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Masturi, L.M. (author), Hendrikse, H. (author), Jarquin Laguna, A. (author), Metrikine, A. (author)The vertical axis pendulum is a type of point absorber device which can absorb wave energy from a width exceeding the physical width of the device. Mechanical power is harvested from the rotation of the pendulum, in which the pivot point is directly connected to the generator. In this paper, a new concept of the vertical axis pendulum device is...conference paper 2019