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Qiu, Y. (author)
Optimal flow control problems are important for applications in science and engineering. Solving such problems usually requires the solution of a large linear generalized saddle-point system. This linear system is sparse and highly indefinite. In order to solve such systems using Krylov subspace methods, efficient preconditioners are necessary...
doctoral thesis 2015
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Van Solingen, E. (author)
In the past decades wind energy has evolved into a mature source of sustainable energy such that onshore wind turbines have become cost competitive with other fossil-based energy sources. Onshore wind energy, however, faces social resistance and a lack of available locations. Offshore wind energy, on the other hand, offers vast amounts of...
doctoral thesis 2015
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Gebraad, P.M.O. (author)
Each wind turbine in a cluster of wind turbines (a wind power plant) can influence the performance of other turbines through the wake that forms downstream of its rotor. The wake has a reduced wind velocity, since the turbine extracts energy from the flow, and the obstruction by the wind turbine rotor causes increased turbulence. If another...
doctoral thesis 2014
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Antonello, J. (author)
Microscopy is an essential tool for life sciences. Thanks to the development of confocal and multiphoton microscopy, scientists are able to obtain high-resolution 3D views of biological specimens. Nevertheless, spatial variations in the index of refraction within specimens cause aberrations that degrade the quality of the 3D views. One can...
doctoral thesis 2014
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Torres Tapia, P.I. (author)
In this thesis, three novel state-space identification algorithms for linear interconnected systems are proposed. The computational complexity and the topology reconstruction of the interconnected system are addressed. Possible applications of this theory can be found in Biology, Economics, Transportation, Electrical and Mechanical Engineering....
doctoral thesis 2014
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Haber, A. (author)
Extreme UltraViolet (EUV) lithography is a new technology for production of integrated circuits. In EUV lithographic machines, optical elements are heated by absorption of exposure energy. Heating induces thermoelastic deformations of optical elements and consequently, it creates wavefront aberrations. These Thermally Induced Wavefront...
doctoral thesis 2014
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Van der Veen, G.J. (author)
In the next decades wind energy is expected to secure a firm share of the total energy production capacity in many countries. To increase competitiveness of wind power with other power sources it is essential to lower the cost of wind energy. Given the design of a turbine, this objective can be attained in several ways, for instance by...
doctoral thesis 2013
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De Vries, E.J.H. (author)
The objective of the thesis is to develop a method for controlled braking of a vehicle. The brake pedal depression has been considered to be proportional to the intended deceleration. The brake controller is not aimed to replace a cruise control; it will have an anti-lock braking (ABS) function. The brake control is essentially designed to be a...
doctoral thesis 2012
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Houtzager, I. (author)
Further developments in data-driven control techniques for the load reduction of modern wind turbines can achieve an increased lifetime of components and make the scaling to larger rotor diameters possible, and therefore improve the cost effectiveness of modern wind turbines. Also the success of future rotor designs will heavily depend for their...
doctoral thesis 2011
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Ellenbroek, R.M.L. (author)
The refractive index of air varies a.o. with temperature, humidity, pressure and the CO2 concentration. Due to atmospheric turbulence this refractive index varies both in space and in time, leading to aberrations in images of light having passed though it. These aberrations limit the achievable resolution of optical telescopes such that the...
doctoral thesis 2011
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Gerard, M.P. (author)
Mobility and traffic safety is a major concern in the society today. Many accidents take place because the vehicle is not following the trajectory that the driver desires. To avoid such accidents, an increasing number of active safety systems are introduced in modern vehicles. Still, most of the time, those systems are designed independently,...
doctoral thesis 2011
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Song, H. (author)
Adaptive optics (AO), also called as Smart Optics, has received increasing attention in the past decades. The main idea behind AO is to actively sense and compensate the optical aberration in the system such that the image resolution is improved or the light beam is well focused. The applications of AO include ground-based telescopes, scanning...
doctoral thesis 2011
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Rice, J.K. (author)
Distributed systems are all around us, and they are fascinating, and have an enormous potential to improve our lives, if their complexity can be properly harnessed. All scientists and engineers are aware of the great potential of this subject, since we witness fantastic distributed control systems every day, in the flocks of birds in the sky and...
doctoral thesis 2010
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Massioni, P. (author)
The recent progress in technology, as in miniaturization and microtechnologies, is now forcing control engineers to confront themselves with systems of incredibly high dimensionality, with an ever growing number of input and output channels. For such systems, which we call "large scale systems", it is necessary to take a new approach in order to...
doctoral thesis 2010
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Dong, J. (author)
The main stream research on fault detection and fault tolerant control has been focused on model based methods. As far as a model is concerned, changes therein due to faults have to be extracted from measured data. Generally speaking, existing approaches process measured inputs and outputs either by a filter designed based on a known model (e.g....
doctoral thesis 2009
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Van Wingerden, J.W. (author)
Active control is becoming more and more important for the wind energy community. If we compare the 'old' stall regulated turbines with today's individual pitch controlled turbines we see that the loads can be considerably reduced, leading to lighter or larger turbines. However, limited actuator bandwidth and component fatigue impose significant...
doctoral thesis 2008
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Hallouzi, R. (author)
doctoral thesis 2008
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Gietelink, O.J. (author)
This thesis presents new tools and methods for the design and validation of advanced driver assistance systems (ADASs). ADASs aim to improve driving comfort and traffic safety by assisting the driver in recognizing and reacting to potentially dangerous traffic situations. A major challenge in designing these systems is to guarantee high...
doctoral thesis 2007
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Hinnen, K.J.G. (author)
Adaptive optics (AO) is a technique to actively correct the wavefront distortions introduced in a light beam as it propagates through a turbulent medium. Nowadays, it is commonly applied in ground-based telescopes to counteract the devastating effect of atmospheric turbulence. This thesis focuses on the control aspects of AO. Whereas most AO...
doctoral thesis 2007
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de Vries, R.A.J. (author)
This thesis presents a novel approach to robust controller design. It describes how linear constraints can be derived on the output of an arbitrary controller, that guarantee robust bounded-input/bounded-output stability and asymptotic perfect tracking of the reference when the external signals become constant. The results are applicable to a...
doctoral thesis 2006
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