Searched for: mods_originInfo_publisher_s%3A%22IOP%255C+Publishing%22
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Yokoyama, T. (author), Eto, M. (author), Nazarov, Y.V. (author)We study theoretically the critical current in semiconductor nanowire Josephson junction with strong spin-orbit interaction. The critical current oscillates with an external magnetic field. We reveal that the oscillation of critical current depends on the orientation of magnetic field in the presence of spin-orbit interaction. We perform a...journal article 2014
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Micallef, D. (author), Akay, B. (author), Simao Ferreira, C.J. (author), Sant, T. (author), Van Bussel, G.J.W. (author)The tip vortex of a wind turbine rotor blade originates as a result of a complex distribution of vorticity along the blade tip thickness. While the tip vortex evolution was extensively studied previously in other work, the mechanism of the initiation of the tip vorticity in a 3D rotating environment is still somewhat obscured due to lack of...journal article 2014
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Alblas, L. (author), Bierbooms, W.A.A.M. (author), Veldkamp, D. (author)Atmospheric stability is known to influence wind farm power output, by affecting power losses due to wakes. This research tries to answer what atmospheric stability does to the power production and how conventional simulations using the Jensen wake model compare and can be improved. Data is used from two offshore wind farms, Egmond aan Zee (OWEZ...journal article 2014
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Van Kuik, G.A.M. (author)Most state of the art rotor design methods are based on the actuator disc theory developed about one century ago. The actuator disc is an axisymmetric permeable surface carrying a load that represents the load on a real rotor with a finite number of blades N. However, the mathematics of the transition from a real rotor load to an...journal article 2014
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Wouters, B. (author), Bonin, J.A. (author), Chambers, D.P. (author), Riva, R.E.M. (author), Sasgen, I. (author), Wahr, J. (author)Continuous observations of temporal variations in the Earth's gravity field have recently become available at an unprecedented resolution of a few hundreds of kilometers. The gravity field is a product of the Earth's mass distribution, and these data—provided by the satellites of the Gravity Recovery And Climate Experiment (GRACE)—can be used to...journal article 2014
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Perez Garza, H.H. (author), Kievit, E.W. (author), Schneider, G.F. (author), Staufer, U. (author)Mechanically straining graphene opens the possibility to exploit new properties linked to the stressed lattice of this two-dimensional material. In particular, theoretical analyses have forecast that straining graphene by more than 10% is a requirement for many novel applications that have not yet been experimentally demonstrated. Recently, we...journal article 2014
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Simao Ferreira, C.J. (author), Aagaard Madsen, H. (author), Barone, M. (author), Roscher, B. (author), Deglaire, P. (author), Arduin, I. (author)Multi-megawatt Vertical Axis Wind Turbines (VAWTs) are experiencing an increased interest for floating offshore applications. However, VAWT development is hindered by the lack of fast, accurate and validated simulation models. This work compares six different numerical models for VAWTS: a multiple streamtube model, a double-multiple streamtube...journal article 2014
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Segeren, M.L.A. (author), Hermans, K.W. (author)The failure of the traditional grouted connections of offshore wind turbines has led to the investigation of alternatives that provide a connection between the foundation pile and the turbine tower. An alternative to the traditional joint is a steel-to-steel connection also called a slip joint. To ensure a proper fit of the slip joint a dynamic...conference paper 2014
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Gebraad, P.M.O. (author), Van Wingerden, J.W. (author)In this paper, we present a novel control-oriented model for predicting wake effects in wind plants, called the FLOw Redirection and Induction Dynamics (FLORIDyn) model. The model predicts the wake locations and the effective flow velocities at each turbine, and the resulting turbine electrical energy productions, as a function of the control...conference paper 2014
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Van Solingen, E. (author), Navalkar, S.T. (author), Van Wingerden, J.W. (author)In this paper Linear Individual Pitch Control (LIPC) is applied to an experimental small-scale two-bladed wind turbine. LIPC is a recently introduced Individual Pitch Control (IPC) strategy specifically intended for two-bladed wind turbines. The LIPC approach is based on a linear coordinate transformation, with the special property that only two...conference paper 2014
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Navalkar, S.T. (author), Van Wingerden, J.W. (author), Van Kuik, G.A.M. (author)Individual pitch control (IPC) for reducing blade loads has been investigated and proven successful in recent literature. For IPC, the multi-blade co-ordinate (MBC) transformation is used to process the blade load signals from the rotating to a stationary frame of reference. In the stationary frame of reference, the yaw error of a turbine can be...conference paper 2014
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Bos, R. (author), Bierbooms, W. (author), Van Bussel, G. (author)With the trend of moving towards 10-20MW turbines, rotor diameters are growing beyond the size of the largest turbulent structures in the atmospheric boundary layer. As a consequence, the fully uniform transients that are commonly used to predict extreme gust loads are losing their connection to reality and may lead to gross over dimensioning....journal article 2014
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- Gillebaart, T. (author), Bernhammer, L.O. (author), Van Zuijlen, A.H. (author), Van Kuik, G.A.M. (author) journal article 2014
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Van der Male, P. (author), Van Dalen, K.N. (author)The wind force on turbine blades, consisting of a drag and lift component, depends nonlinearly on the relative wind velocity. This relative velocity comprises mean wind speed, wind speed fluctuations and the structural response velocity. The nonlinear wind excitation couples the flap wise and edge wise response of a turbine blade. To analyze...journal article 2014
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Holtslag, M.C. (author), Bierbooms, W.A.A.M. (author), Van Bussel, G.J.W. (author)In this paper the dependence of wind turbine fatigue loads on atmospheric stability is assessed. It is shown that fatigue loads depend strongly on stability, and highest loads occur for very unstable conditions. For a given hub height wind speed one can dene an equivalent atmospheric stability that corresponds to the same cumulative loads as if...journal article 2014
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Jarquin-Laguna, A. (author)An innovative and completely different wind-energy conversion system is studied where a centralized electricity generation within a wind farm is proposed by means of a hydraulic network. This paper presents the dynamic interaction of two turbines when they are coupled to the same hydraulic network. Due to the stochastic nature of the wind and...journal article 2014
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Fechner, U. (author), Schmehl, R. (author)Kite power technology is a novel solution to harvest wind energy from altitudes that can not be reached by conventional wind turbines. The use of a lightweight but strong tether in place of an expensive tower provides an additional cost advantage, next to the higher capacity factor. This paper describes a method to estimate the wind velocity at...journal article 2014
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Zhang, Y. (author), Van Zuijlen, A. (author), Van Bussel, G. (author)In this paper, three dimensional flow over non-rotating MEXICO blades is simulated by CFD methods. The numerical results are compared with the latest MEXICO wind turbine blades measurements obtained in the low speed low turbulence (LTT) wind tunnel of Delft University of Technology. This study aims to validate CFD codes by using these...journal article 2014
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Hosseini Aria, S.E. (author), Menenti, M. (author), Gorte, B.G.H. (author)Reliability analysis is usually applied to evaluate classification procedures with different classes. In this research, we have applied the analysis to two different band sets to find out which one is more reliable. These band sets provide the most informative spectral regions covered by hyperspectral images. The informative regions are...journal article 2014
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Carvalho Monteiro De Sena Silv, I. (author), Schut, H. (author), Fedorov, A. (author), Luzginova, N. (author), Desgardin, P. (author), Sietsma, J. (author)Reduced Activation Ferritic/Martensitic steels are being extensively studied because of their foreseen application in fusion reactors. To reproduce neutron irradiation conditions, Eurofer97 samples were implanted at room temperature with helium ions at energies of 500 keV and 2 MeV and doses of 1x1015-1017 He /cm2. The implantation induced...conference paper 2014
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