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Sokołowski, Piotr (author)State-of-the-art tilt-rotor flight mechanics models appear to be inadequate in predicting the flight dynamics behavior across the entire flight envelope due to a lack of experimental data suggesting the need for more generic models. This paper presents a middle ground between model flexibility (genericity) and accuracy. For this purpose a...master thesis 2022
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Castillo Capponi, Diego (author)In the last few years, a new aircraft configuration has been developed: the electric Vertical Take-off/Landing aircraft (eVTOL). To improve aircraft efficiency, structures are lighter and more flexible. Due to the structure's flexible nature and the use of propellers for propulsion, eVTOL are prone to whirl flutter, which consists of a dynamic...master thesis 2022
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Dos Santos Pereira Malveiro, Carlos (author)The most effective way to decrease the cost of energy of wind turbines is to increase the rotor diameter. Therefore, this calls for the need of aerodynamic research on large wind turbines. This thesis project will tackle the topics addressed by the IEA Wind Task 47 which is focused on the aerodynamic analysis and comparison of the newly proposed...master thesis 2022
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de Gruijl, Wouter (author)To make propellers more viable as a greener alternative to jet engines, the issue of propeller noise needs to be addressed. Previous propeller design optimization studies rarely take into account the effects on aerodynamic and aeroacoustic performance due to non-uniform inflow, the type of flow the propeller would experience if it was installed...master thesis 2022
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Beinema, Thomas (author)With the climate goals of the Paris Agreement and the European Green Deal, countries need to reduce their carbon footprint and increase their renewable energy production. For countries with high population density, land-based photovoltaics (solar) takes up valuable space. Therefore, solar application at sea is considered. <br/><br/>One of the...master thesis 2022
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Lasisi, S.O. (author), Benson, T.M. (author), Greenaway, M.T. (author), Gradoni, G. (author), Cools, K. (author)We demonstrate how the coupling of a full-wave time-domain boundary element method (BEM) solver with a circuit solver can be used to model 1) the generation of high frequency oscillations in resonant tunneling diode (RTD) oscillators, and 2) the mutual coupling and synchronization of non-identical RTDs with significant differences in frequencies...journal article 2022
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Hur, C. (author), Ferreira, Carlos (author), Schepers, Gerard (author)Horizontal axis wind turbines (HAWTs) experience yaw misalignments due to the physical limitations of yaw controllers and various novel active yaw controls. Moreover, the motion of floating offshore wind turbines (FOWTs) accelerates yaw misalignment. The blade element momentum (BEM) method is widely used due to its computational efficiency for...journal article 2022
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Dong, J. (author)In order to significantly increase the share of wind energy produced worldwide, wind energy technology is moving from onshore to offshore and from shallow water to deep water. Floating offshore wind turbines (FOWTs) are expected to be economically better than bottom-mounted turbines when placed in water deeper than 60 metres. Despite key...doctoral thesis 2021
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Mascini, Merlijn (author)Eddy currents are currents which are induced in a conducting object by a varying magnetic field. These currents generate a magnetic field of their own. Modelling this phenomenon constitutes a diverse and challenging set of problems, for which many applications exist. One such application is the degaussing system of a naval ship. To guarantee...master thesis 2021
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de Smalen, Teun (author)MRI is an non-invasive imaging technique used by many physicians to diagnose and treat diseases. The technique however is still very expensive and thus out of reach for developing countries. This has led to the goal to design a low-cost MRI system. The challenges that arise from this system make it necessary to design coils in a different way...master thesis 2021
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Zhao, M. (author), de Oliveira Barbosa, J.M. (author), Yuan, Jun (author), Metrikine, A. (author), van Dalen, K.N. (author)This paper investigates the instability of vertical vibrations of an object moving uniformly through a tunnel embedded in soft soil. Using the indirect Boundary Element Method in the frequency domain, the equivalent dynamic stiffness of the tunnel-soil system at the point of contact with the moving object, modelled as a mass-spring system or...journal article 2021
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Lotz, Jacob (author)Recently the interest in hydrofoil vessels using a fully submerged hydrofoil increased. Hydrofoil vessels experience a resistance hump and possible instabilities during their takeoff of which both are influence by waves. In order to determine the required power during the takeoff to overcome the resistance hump and to investigate whether the...master thesis 2020
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Bicker, Michiel (author)A variation study is conducted in which the tunnel width and depth are varied to envisage the effect on the required propulsion power and the longitudinal position of buoyancy. The propulsion power is calculated using a combined RANS - BEM model. Furthermore, the propeller is evaluated using different design difficulty indices.master thesis 2020
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Phadke, Rohit (author)The battle against climate change begins with maximizing the share of renewable energy in the total energy mix, such that the cost of energy will be minimum. Wind energy will play a vital role in maximizing the share of renewables in the total energy mix. In order to reach the LCOE projection of 0.09 Euro/KWh a decrease in the material cost...master thesis 2019
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Han, J. (author), Zhang, Lingling (author), Zhang, Qunfei (author), Leus, G.J.T. (author)Orthogonal signal-division multiplexing (OSDM) is a generalized modulation scheme to bridge the gap between orthogonal frequency-division multiplexing (OFDM) and single-carrier frequency-domain equalization. It allows significantly more flexibility in system design; however, over doubly-selective channels, it suffers from a special signal...journal article 2019
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Maljaars, P.J. (author), Bronswijk, L.M.E. (author), Windt, Jaap (author), Grasso, Nicola (author), Kaminski, M.L. (author)In the past several decades, many papers have been published on fluid–structure coupled calculations to analyse the hydro-elastic response of flexible (composite) propellers. The flow is usually modelled either by the Navier–Stokes equations or as a potential flow, by assuming an irrotational flow. Phenomena as separation of the flow, flow...journal article 2018
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Maljaars, P.J. (author), Kaminski, M.L. (author), den Besten, J.H. (author)Boundary element methods (BEM) have been used for propeller hydrodynamic calculations since the 1990s. More recently, these methods are being used in combination with finite element methods (FEM) in order to calculate flexible propeller fluid–structure interaction (FSI) response. The main advantage of using BEM for flexible propeller FSI...journal article 2018
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Ramdin, S.F. (author)The Blade Element Momentum (BEM) theory is widely used for the design of wind turbine blades and predicting aerodynamic loads because of its ability to compute fast and reasonable results. However, the Prandtl tip loss factor is needed to improve the accuracy of the results near the tip. In this thesis the limitations and shortcomings of this...master thesis 2017
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Maljaars, P.J. (author), Grasso, Nicola (author), Kaminski, M.L. (author), Lafeber, Wim (author)This paper presents numerical and experimental results for the validation of a coupled Boundary Element Method (BEM)-Finite Element Method (FEM) simulation for uniform flows. In the first part of the paper the numerical models and the BEM-FEM coupling are presented. A large part of the paper is dedicated to the validation procedure which has...conference paper 2017
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Den Heijer, A. (author)Pigs (pipeline inspection gauges) are free moving piston-like devices, that are used for inspecting or cleaning pipelines in for example the oil and gas industry. Here they are used for onshore and offshore pipelines, where they are propelled by the production fluids. A better control of the velocity of the pig in the pipeline can be achieved by...master thesis 2016
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