Searched for: mods_originInfo_publisher_s%3A%22American%255C+Institute%255C+of%255C+Aeronautics%255C+and%255C+Astronautics%255C+%255C%2528AIAA%255C%2529%22
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Tadema, J. (author), Theunissen, E. (author)
conference paper 2011
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Wright, A.D. (author), Fleming, P. (author), Van Wingerden, J.W. (author)
Wind turbines are complex, nonlinear, dynamic systems forced by aerodynamic, gravitational, centrifugal, and gyroscopic loads. The aerodynamics of wind turbines are nonlinear, unsteady, and complex. Turbine rotors are subjected to a complicated 3-D turbulent wind inflow field, with imbedded coherent vortices that drive fatigue loads and reduce...
conference paper 2011
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Correale, G. (author), Popov, I.B. (author), Ratikin, A.E. (author), Starikovskii, A.Y. (author), Hulshoff, S.J. (author), Veldhuis, L.L.M. (author)
An experimental study of flow separation control with a nanosecond pulse plasma actuator was performed in wind-tunnel experiments. The discharge used had a pulse width of 12 ns and rising time of 3 ns with voltage up to 12 kV. Repetition frequency was adjustable up to 10 kHz. The first series of experiments was to measure integral effects of the...
conference paper 2011
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Pereira, R. (author), Schepers, G. (author), Pavel, M.D. (author)
The aim of this study is to assess the load predicting capability of a classical Beddoes-Leishman dynamic stall model in a horizontal axis wind turbine (HAWT) environment, in the presence of yaw-misalignment. The dynamic stall model was tailored to the HAWT environment, and validated against unsteady thick airfoil data. Subsequently, the dynamic...
conference paper 2011
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Fleming, P.A. (author), Wright, A.D. (author), Fingersh, L.J. (author), Van Wingerden, J.W. (author)
The CART3 (Controls Advanced Research Turbine, 3-bladed) at the National Wind Technology Center has recently been converted from a 2-bladed constant speed machine to a 3-bladed variable speed machine designed specifically for controls research. The purpose of this conversion was to develop an advanced controls field-testing platform which has...
conference paper 2011
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De Vries, E. (author), Subbarao, K. (author)
Potential function based swarm control is a technique using artificial potential functions to generate steering commands resulting in swarming behavior. This means that the vehicles in the swarm autonomously take care of flying in formation, resulting in steering the swarm, instead of all the individual vehicles being tasked separately. This...
conference paper 2011
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Verhaagen, N.G. (author)
The experimental study focuses on the effects of the leading-edge radius on the flow over 50º swept delta wing models. Three models were tested, one model has a sharp leading edge and two other have a semi-circular leading edge of different radius. The vortical flow on and off the surface of the models was investigated using an oil-flow...
conference paper 2011
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Mayordomo, A.F. (author), Ghobbar, A.A. (author), Ghijs, S.S.A. (author), Cator, E. (author)
This paper presents a model that helps engine management make cost saving decisions. The model is developed around airline-influenced factors that have an impact on engine Maintenance Repair & Overhaul (MRO): Operations, maintenance philosophy, contract type, and fleet age. Within the model a decision support tool is developed to analyze the...
conference paper 2010
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Nagy, A.P. (author), Abdalla, M.M. (author), Gürdal, Z. (author)
Thin-walled composite structures, typically modeled as Cosserat continua during the design phase, are of particular importance in aerospace and automotive applications. At the dawn of industrial scale adoption of advanced fibre placement technology, it became viable to better exploit the directional properties of composite materials. In the...
conference paper 2010
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Steenhuizen, D. (author), Van Tooren, M.J.L. (author)
In order to asess the merit of novel high-lift structural concepts to the design of contemporary and future transport aircraft, a highly automated design routine is elaborated. The structure, purpose and evolution of this design routine is set-out with the use of Knowledge-Based Engineering techniques. As a case-study, the automated design of...
conference paper 2010
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Beelaerts van Blokland, W.W.A. (author), Elferink, N.H. (author), Van der Zwan, F.M. (author)
Theories on value creation, co-innovation and co-development and lean enterprise have gained in popularity in recent times. This research has taken aim at extending the investigation on how to quantify companies’ capabilities in creating value for their stakeholders. A theoretical framework was adopted to build the performance measurement method...
conference paper 2010
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Khani, A. (author), Abdalla, M.M. (author), Gürdal, Z. (author)
For a non-circular cylinder the radius of curvature changes around the circumference. Therefore for constant stiffness non-circular cylinders, some specific locations in the circumference are more prone to buckle. The same problem exists for circular cylinders with non-uniform loading in the cross-section like a cylinder under bending. This...
conference paper 2010
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Curran, R. (author), Van der Zwan, F.M. (author), Ouwehand, A. (author), Ghijs, S.S.A. (author)
The paper presents the results from a study in collaboration with an airline that looked at modeling the relationship of maintenance and fuel burn costs relative to minimizing the life cycle cost relative to schedule. The work has verified that the bucket theory presented in the paper is a correct and has a direct impact on the scheduling...
conference paper 2010
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Schroijen, M.J.T. (author), Van Tooren, M.J.L. (author)
Environmental issues play an increasingly important role in aviation, affecting the desirability of novel technologies directly. The desirability of a certain technology with respect to environmental issues is determined by the system of systems level impact instead of the often used system level impact. Changing this perspective introduces...
conference paper 2010
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Violato, D. (author), Bryon, K. (author), Moore, P. (author), Scarano, F. (author)
This paper describes an experimental investigation by time-resolved planar and tomographic PIV on the sound production mechanism of vortex pairing of a transitional water-jet flow at Re=5000. The shear layer is characterized by axisymmetric vortex rings which undergo pairing with a varicose mode. Three-dimensional measurements show the presence...
conference paper 2010
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Ridolfi, G. (author), Mooij, E. (author), Chiesa, S. (author)
The design of complex systems has become more and more articulated during the last decade, thus forcing radical modifications on the overall methodological approach. The authors developed a design methodology, which allows the user to design a particular category of complex systems usually called System-of-systems. This paper discusses the...
conference paper 2010
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Bertuccelli, L.F. (author), Beckers, N.W.M. (author), Cummings, M.L. (author)
With the increased use of Unmanned Aerial Vehicles (UAVs), it is envisioned that UAV operators will become high level mission supervisors, responsible for information management and task planning. In the context of search missions, operators supervising a large number of UAVs can become overwhelmed with the sheer amount of information collected...
conference paper 2010
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Lombaerts, T.J.J. (author), Looye, G.H.N. (author), Chu, Q.P. (author), Mulder, J.A. (author)
This paper describes how the previously developed concept of Pseudo Control Hedging (PCH) can be integrated in a Fault Tolerant Flight Controller (FTFC) as a safe flight envelope protection system of the first degree. This PCH algorithm adapts the reference model for the system output in case of unachievable commands due to control input...
conference paper 2010
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Nieuwenhuizen, F.M. (author), Van Paasen, M.M. (author), Mulder, M. (author), Bülthoff, H.H. (author)
A simulated model of the MPI Stewart platform can be used to identify the influence of motion system characteristics on human control behaviour in active closed-loop control experiments on the SIMONA Research Simulator. In this paper, a previously identified model of the MPI Stewart platform was analysed with describing function measurements,...
conference paper 2010
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Van Kampen, E. (author), Chu, Q.P. (author), Mulder, J.A. (author)
This paper applies interval optimization to the fixed-time multiple impulse rendezvous and docking problem. Current methods for solving this type of optimization problem include for example genetic algorithms and gradient based optimization. Unlike these methods, interval methods can guarantee that the globally best solution is found for a given...
conference paper 2010
Searched for: mods_originInfo_publisher_s%3A%22American%255C+Institute%255C+of%255C+Aeronautics%255C+and%255C+Astronautics%255C+%255C%2528AIAA%255C%2529%22
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