Searched for: department%3A%22Aerospace%255C%252BDesign%252C%255C%252BIntegration%255C%252Band%255C%252BOperations%22
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Van Kuik, G.A.M. (author), Van Zuijlen, A.H. (author)
Actuator disc calculations can be divided in two categories: force models where, for a prescribed force field, the flow is calculated using a CFD method, and kinematic models, where the wake is calculated based on wake boundary conditions and the force field is known when the velocities are known. In both categories, but specifically for the...
conference paper 2009
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Bierbooms, W.A.A.M. (author), Peeringa, J. (author)
Up to now just deterministic gust shapes are specified in standards; e.g. the Extreme Operating Gust (IEC) is given by a Mexican hat like shape. In this paper gust shapes will be determined by application of so-called constrained stochastic simulation. This method specifies how to efficiently generate time series around some specific event (e.g....
conference paper 2009
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Lackner, M.A. (author), van Kuik, G.A.M. (author)
Modern wind turbines have been steadily increasing in size, and have now become very large, with recent models boasting rotor diameters greater than 120 m. Reducing the loads experienced by the wind turbine rotor blades is one means of lowering the cost of energy of wind turbines. Wind turbines are subjected to significant and rapid fluctuating...
conference paper 2009
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Timmer, W.A. (author)
This paper investigates the NACA 63 and 64 6-digit series of airfoils tested in the NACA LTPT in view to verify the RFOIL calculated airfoil characteristics for high Reynolds numbers. Some anomalies in the zero-lift angles of 15% and 18% thick airfoils from these series are identified, both in the airfoil clean case and in case of wrap-around...
conference paper 2009
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Micallef, D. (author), Kloosterman, M. (author), Simao Ferreira, C.J. (author), Sant, A. (author), Van Bussel, G.J.W. (author)
conference paper 2009
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Sorensen, J.N. (author), Van Kuik, G.A.M. (author)
conference paper 2009
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Simao Ferreira, C.J. (author), Hofemann, C. (author), Van Kuik, G. (author), Van Bussel, G. (author)
conference paper 2009
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Barlas, A. (author), van Kuik, G.A.M. (author)
A newly developed comprehensive aeroelastic model is used to investigate active flap concepts on the Upwind 5MW reference wind turbine. The model is specially designed to facilitate distributed control concepts and advanced controller design. Different concepts of centralized and distributed control schemes based on choices of realistic...
conference paper 2009
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Simao Ferreira, C.J. (author), Dixon, K.R. (author), Hofemann, C. (author), Van Kuik, G.A.M. (author), Van Bussel, G.J.W. (author)
One of the results of the development of wind energy conversion solutions for the built environment is the reappearance of Vertical Axis Wind Turbines (VAWTs). The application of wind turbines in urban environments presents design challenges driven by the complex wind fields experienced in the urban boundary layer. Urban Wind Turbines operate...
conference paper 2009
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Podgaets, A.R. (author), Ockels, W.J. (author)
A new innovative approach to sailing has been proposed by TU Delft. It allows sailing in any desired direction, including straight into the wind. The concept consists of generating energy with a sky sail and then using it in an electric motor of the ship. The paper describes a mathematical model of laddermill sail.
conference paper 2007
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Podgaets, A.R. (author), Ockels, W.J. (author)
Laddermill flight control problem with closed loop is considered in this paper. Laddermill is an alternative concept for energy production using high altitude kites. The kites have been simulated as rigid bodies and the cable as a thin elastic line. Euler angles and cable speed are controls. Flight control is written as a fusion of two...
conference paper 2007
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Breukels, J. (author), Ockels, W.J. (author)
For the purpose of ultimately building a fully dynamic simulation of kites, an investigation is launched into a viable model of the cable with which the kite is attached to the ground. In the model proposed in this paper, only the slow modes of motion are taken into account due to the fact that only the slow motions have a real effect on the...
conference paper 2007
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Podgaets, A.R. (author), Ockels, W.J. (author)
Laddermill sail is an innovative approach to propel the ship with the power generated by kites. The first Laddermill system is currently being designed however existing mathematical models of the system produce different optimal recommendations. Thus a decision has been made to step back and to take a closer look at the mathematical models of...
conference paper 2007
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Ockels, W.J. (author)
From his personal experience during a space flight (Challenger 1985) onward, the author has been struck repeatedly by the remarkable influence of Earth's environment on life, in particular by its most inevitable elements: time and gravity. Our life might be peculiar to the local Earth conditions, and not cosmic per se. In this article the...
conference paper 2007
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Williams, P. (author), Lansdorp, B. (author), Ockels, W. (author)
Non-powered flight vehicles such as kites can provide a means of transmitting wind energy from higher altitudes to the ground via tethers. Although there have been many proposals for systems to extract wind energy from higher altitudes, this paper focuses on the use of a light lifting body at the end of a tether to generate useful power. Two...
conference paper 2007
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Podgaets, A.R. (author), Ockels, W.J. (author)
Closed loop Laddermill flight control problem is considered in this paper. Laddermill is a high altitude kites system for energy production. The kites have been simulated as rigid bodies and the cable as a thin elastic line. Euler angles and cable speed are controls. Flight control is written as a fusion of two approaches: design of experiments...
conference paper 2007
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Melkert, J. (author), Van Wee, B. (author)
Since the year 2000 the Netherlands are using a new guideline for assessing the costs and benefits of transport systems. This guideline has been used several times now to assess transport systems using existing transport modes like trains. This paper reports on the first time this guideline was used to assess an innovative transport concept, the...
conference paper 2007
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Podgaets, A.R. (author), Ockels, W.J. (author)
One of novel concepts to use the energy of high altitude winds is by launching a series of kite on a long rope and let them pull the rope thus driving the generator. A mathematical model of tethered kites system has been developed consisting of models of kites and of the cable that links them together and to the generator on the ground energy...
conference paper 2006
Searched for: department%3A%22Aerospace%255C%252BDesign%252C%255C%252BIntegration%255C%252Band%255C%252BOperations%22
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