Searched for: author:"Yu, W."
(1 - 10 of 10)
document
Yu, W. (author), Kleijn, W.B. (author)
We describe a new method to estimate the geometry of a room and reflection coefficients given room impulse responses. The method utilizes convolutional neural networks to estimate the room geometry and multilayer perceptrons to estimate the reflection coefficients. The mean square error is used as the loss function. In contrast to existing...
journal article 2021
document
Engels, W. P. (author), van der Hoek, D.C. (author), Yu, W. (author), Reyes Baez, R. (author)
Many wind turbines are still controlled using gain scheduled, PI(D) controllers. Another option is to use a state feedback controller, such as LQG control. However, for wind turbines that is not straight forward solution, because the system is non-linear and the impact of pitching on the states varies in time. This paper presents a variation...
journal article 2020
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Yu, W. (author), De Tavernier, D.A.M. (author), Ferreira, Carlos (author), van Kuik, G.A.M. (author), Schepers, J.G. (author)
Two new engineering models are presented for the aerodynamic induction of a wind turbine under dynamic thrust. The models are developed using the differential form of Duhamel integrals of indicial responses of actuator disc type vortex models. The time constants of the indicial functions are obtained by the indicial responses of a linear and...
journal article 2019
document
Yu, W. (author)
Blade Element Momentum (BEM) is the most important aerodynamic analysis method for wind turbines. BEM is derived assuming stationary conditions, which limits its ability to model the unsteady aerodynamic effects. This becomes increasingly relevant for the flexible blades of current large-scale turbines, and the employment of passive and active...
doctoral thesis 2018
document
Yu, W. (author), Hong, V.W. (author), Ferreira, Carlos (author), van Kuik, G.A.M. (author)
The Blade Element Momentum model, which is based on the actuator disc theory, is still the model most used for the design of open rotors. Although derived from steady cases with a fully developed wake, this approach is also applied to unsteady cases, with additional engineering corrections. This work aims to study the impact of an unsteady...
journal article 2017
document
Yu, W. (author)
master thesis 2017
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Yu, W. (author), Hong, V.W. (author), Simao Ferreira, C.J. (author), van Kuik, G.A.M. (author)
The state of the art engineering dynamic in ow models of Pitt-Peters, ¬ye and ECN have been used to correct Blade Element Momentum theory for unsteady load prediction of a wind turbine for two decades. However, their accuracy is unknown. This paper is to benchmark the performance of these engineering models by experimental and numerical methods....
journal article 2016
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Yu, W. (author), Ferreira, Carlos (author), van Kuik, G.A.M. (author), Baldacchino, D. (author)
Although the Blade Element Momentum method has been derived for the steady conditions, it is used for unsteady conditions by using corrections of engineering dynamic inflow models. Its applicability in these cases is not yet fully verified. In this paper, the validity of the assumptions of quasi-steady state and annuli independence of the blade...
journal article 2016
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Van Kuik, G.A.M. (author), Yu, W. (author), Sarmast, S. (author), Ivanell, S. (author)
journal article 2015
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Yu, W. (author), Simao Ferreira, C.J. (author), van Kuik, G.A.M. (author)
Smart rotor emerges as an innovation technique to reduce the impact of dynamic loading on wind turbines. Local movements of distributed aerodynamic devices will enhance the non-uniformity and dynamic effects of loading, which will challenge the applicability of the blade element momentum theory (BEM) for smart rotor control design due to its...
conference paper 2014
Searched for: author:"Yu, W."
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