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Berdowski, T.J. (author), Ferreira, Carlos (author), van Zuijlen, A.H. (author), van Bussel, G.J.W. (author)A PhD project is being carried out on the topic of far-wake aerodynamics of Horizontal Axis Wind Turbines (HAWTs) in yawed conditions, which has a large relevance for wind farm design and optimization. Characteristic for a turbine in yaw are the inherent unsteady and non-uniform rotor loading, and the typical wake deflection and strong three...abstract 2017
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LeBlanc, B.P. (author), de la Garza Cuevas, R. (author), Ferreira, Carlos (author)Research into the Vertical Axis Wind Turbine (VAWT) has been progressing over the last few years due to<br/>the large shift in design constraints for large floating offshore wind turbines by leveraging tools and experience<br/>from research beginning in the 1970s and lasting until the HAWT established market dominance in the 1990s. The beginning...abstract 2017
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De Tavernier, D. (author), Ferreira, Carlos (author), Goude, Anders (author)This chapter highlights the main aerodynamic phenomena and challenges of vertical-axis wind turbines. First, an introduction is provided on the VAWT history and (dis-)advantages. The basics of VAWT aerodynamics and the various rotor simplifications/representations are presented. Further, the state-of-the art aerodynamic modeling techniques,...book chapter 2022
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- Van der Pijl, F.F.A. (author), Bauer, P. (author), Ferreira, J.A. (author), Polinder, H. (author) conference paper 2007
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- Bang, D. (author), Polinder, H. (author), Shrestha, G. (author), Ferreira, J.A. (author) conference paper 2009
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Shrestha, G. (author), Polinder, H. (author), Bang, D. (author), Jassal, A.K. (author), Ferreira, J.A. (author)A direct drive generator used in wind turbine has high energy yield compared to other drivetrain topologies and low maintenance is expected as the technology matures. On the other hand direct drive generator weight and size increases rapidly when scaled up to larger units. This paper will investigate the possibility of weight reduction of large...conference paper 2009
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J.J. Wolmarans, J.J. (author), Ferreira, J.A. (author)At the hand of a case study alternative energy sources, methods of transportation and their effect on the electricity grid oncefossilfuels have been depleted is discussed. Three methods of sustainable transport are presented. The energy requirement for each is calculated as well as the requirements from the electricity grid for traveling a 200km...conference paper 2007
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Weber, J.H. (author), Schouhamer Immink, K.A. (author), Ferreira, H.C. (author)Knuth's celebrated balancing method consists of inverting the first z bits in a binary information sequence, such that the resulting sequence has as many ones as zeroes, and communicating the index z to the receiver through a short balanced prefix. In the proposed method, Knuth's scheme is extended with error-correcting capabilities, where it is...conference paper 2011
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- Zhou, Y. (author), Bauer, P. (author), Ferreira, J.A., Pierik, J. (author) conference paper 2007
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- de Jong, E.C.W. (author), Popovic, J. (author), Ferreira, J.A. (author) conference paper 2006
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Tomé, M.F. (author), Castelo, A. (author), Ferreira, V.G. (author)This work presents a numerical method for solving three-dimensional viscoelastic free surface flows governed by the Oldroyd-B constitutive equation. It is an extension to three dimensions of the technique introduced by Tomé et al. [1] (see also [5]). The governing equations are solved by a finite difference method on a 3D-staggered grid. Marker...conference paper 2006
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Ani, S.O. (author), Polinder, H. (author), Ferreira, J.A. (author), Ockels, W.J. (author)This paper discusses the possibilities of applying high temperature superconducting (HTS) synchronous motor to Superbus, an alternative and sustainable type of public transportation developed at TU Delft. Two important factors within the Superbus drive that influence the operating range are weight and efficiency: increasing the weight results in...conference paper 2009
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- Shrestha, G. (author), Polinder, H. (author), Bang, D.J. (author), Ferreira, J.A. (author) conference paper 2007
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- Bang, D.J. (author), Polinder, H. (author), Ferreira, J.A. (author), van Rooij, R.P.J.O.M. (author) conference paper 2007
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Akay, B. (author), Micallef, D. (author), Ferreira, C.S. (author), Van Bussel, G.J.W. (author)This paper sets out to describe the measurements and computations to construct three components of velocity field around the blade. The primary aim of the measurements was to gain insight into the physics of the flow field produced by a horizontal axis wind turbine-HAWT blade. Stereo Particle Image Velocimetry experiments were performed on a two...conference paper 2011
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Katsigiannis, G. (author), Schweiger, H.F. (author), Ferreira, P. (author), Fuentes, R. (author)This paper focuses on the derivation of design prop loads for supported excavations in stiff clay with increasing excavation depth and number of prop levels. For multi-propped walls there are a number of empirical graphs to obtain the design prop forces. CIRIA C517 (Twine & Roscoe, 1999) enhancing Terzaghi & Peck's work (Terzaghi & Peck (1967)...conference paper 2015
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- Manoj Mandru, Prabu Sai (author), Leuthold, Rachel (author), Schmehl, Roland (author), Ferreira, Carlos (author) conference paper 2017
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Fiorito, S. (author), Orsi, F. (author), Serdoura, F.M. (author), Ferreira, V. (author)The present work constitutes the first stage of an ongoing research on the interaction between morphological characteristics of the urban fabric and the amount of social activity in such spaces. In order to analyze such correlation, the current research links together two different field of studies: Space Syntax on one side, for the...conference paper 2013
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Coutinho, F. (author), Mateus, L. (author), Duarte, J.P. (author), Ferreira, V. (author), Kruger, M. (author)This paper describes a generative design approach integrating real building data in the process of developing a shape grammar. The goal is to assess to which extent it is feasible the use of a reverse engineering procedure to acquire actual building data and what kind of impact it may have on the development of a shape grammar.The paper...conference paper 2013
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Van der Geest, M. (author), Wolmarans, J.J. (author), Polinder, H. (author), Ferreira, J.A. (author), Zeilstra, D. (author)High speed fault tolerant permanent magnet machines have strong asynchronous airgap harmonics, making them susceptible to rotor eddy-current losses. These losses can be reduced by using novel high resistivity materials like plastic bonded magnets and carbon fiber reinforced retaining sleeves. This paper examines by numerical studies the...conference paper 2012