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Delil, A.A.M. (author)The work described was done during a five months stay as visiting professor at the Institute of Space and Astronautical Science, in Sagamihara, Japan. The research concentrates on pulsating and oscillating heat transfer devices, being of interest for applications in spacecraft thermal control in microgravity, in planetary partial gravity and...report 2001
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Grooteman, F.P. (author), Ottens, H.H. (author), ten Hoeve, H.J. (author)Fatigue analysis, to determine the lifetime of a component or complete aircraft structure, normally is based on deterministic models, in which the parameters are constants. In order to compensate for neglecting the natural variability of the parameters and other uncertainties a safety factor is applied. Another way of dealing with the...report 2001
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Ottens, H.H. (author)A review is presented of the work on aeronautical fatigue that is performed in the Netherlands in the period March 1999 till March 2001.report 2001
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Wanhill, R.J.H. (author), Hattenberg, T. (author), van der Hoeven, W. (author), Koolloos, M.F.J. (author)Longitudinal lap splices from several types of transport aircraft pressure cabins were investigated for Multiple Site Damage (MSD) fatigue and corrosion. The lap splices came from five service aircraft, three Fokker F28s, a British Aerospace BAC 1-11 and a Boeing B727-100; and a fullscale test on a Fokker F100. The results are compared with NASA...report 2001
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van Es, G.W.H. (author), Roelen, A.L.C. (author), Kruijsen, E.A.C. (author), Giesberts, M.K.H. (author)The runway surface condition at airports is a critical safety concern. The exploratory study described in this paper has examined the influence of wet and contaminated runways on the takeoff and landing performance of aircraft. The operating problems that arise when taking off from or landing on wet or contaminated runways, are explained in...report 2001
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van der Geest, P.J. (author), Nieuwpoort, T.M.H. (author), van Es, G.W.H. (author)In the next decades, airline operations will continue to grow. It is expected that the number of departures will almost double by 2016. This increase in departures requires an increase of the capacity of many airports worldwide. An important aspect, which affects the potential growth of airport capacity, as well as the optimal layout of new...report 2001
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van Es, G.W.H. (author)Hydroplaning of aircraft tires is often a contributing factor in take-off and landing overrun and veeroff accidents. Therefore hydroplaning of aircraft tires has been studied for many years. The majority of the current knowledge on hydroplaning was obtained in the 60's by mainly NASA studies. Since then new tire types like radial tires were...report 2001
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de Wolf, W.B. (author), Woldendorp, S. (author), Tinga, T. (author)To support gas turbine operators, NLR is developing capabilities for life assessment of hot engine components. As a typical example the first rotor blades of the high pressure (HP) turbine of the FlOO- PW-220 military turbofan will be discussed. For these blades tools have been developed to derive the blade temperature history from flight data...report 2001
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Schippers, H. (author), Verpoorte, J. (author), Vos, G. (author)The aim of this paper is to describe a computational model for assessment of electromagnetic interaction of conformal antennas with the aircraft structure. The conformal array antennas are assumed to be flush-mounted on the surface of an aircraft. The model assumes a receiving conformal antenna, which is illuminated by a plane wave. The...report 2001
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Schultheiss, B.C. (author), Baalbergen, E.H. (author)Potentially unlimited computing power is provided today by computing facilities available via the Internet. Unfortunately, the facilities exhibit a variety of non-uniform interfaces to the users. Each facility has its own operating system, its own policy with respect to access and accounting, its own set of tools, and its own data. To utilize...report 2001
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Creemers, R.J.C. (author)In June 2000 a two-year joint programme by Fokker Space (FS), Centre of Lightweight Structures (CLC), and the National Aerospace Laboratory NLR was started to develop, manufacture, and qualify a demonstrator fairing. The programme is funded by the Netherlands Agency for Aerospace Programmes (NIVR) within the framework of the national NRT...report 2001
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Schulten, J.B.H.M. (author)A theoretical study on the potential of controlled vane vibration to reduce rotor-stator interaction noise is presented. A lifting surface method was applied to compute the interaction of viscous rotor wakes with vanes in a realistic fan configuration. The lifting surface modeling was extended to include a vibration in pitch of the unswept...report 2001
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Keuning, M. (author), van de Sluis, E. (author), ten Dam, A.A. (author)Distributed simulation requires a novel approach to exercise management. With the introduction of (geographically) distributed simulations, exercise management consists of managing a multitude of simulators in a common scenario. This imposes new challenges with respect to managing the distributed responsibilities of the simulation. NLR's...report 2001
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Brogliato, B. (author), ten Dam, A.A. (author), Paoli, L. (author), Génot, F. (author), Abadie, M. (author)This paper focuses on the problems related to the numerical simulation of finite dimensional nonsmooth multibody mechanical systems. The rigid body dynamical case is examined here. This class of systems involves complementarity conditions and impact phenomena which make its study and numerical analysis a difficult problem that cannot be solved...report 2001
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Nijboer, R.J. (author)A numerical method using finite elements for the solution of the eigenvalues and eigenfunctions in non-uniform, non-axial ducted flows is described. The method is validated against results from the literature for swirling flows and against an approximate analytical solution for a small solid block swirl. In non-uniform flows not only acoustic...report 2001
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Sijtsma, P. (author), Oerlemans, S. (author), Holthusen, H. (author)A method is described for the location of moving sources by a microphone array. This method can be applied to out-of-flow measurements in an open jet wind tunnel. For that purpose, an expression is derived for the pressure field of a moving monopole in a uniform flow. It is argued that the open jet shear layer does not form a serious obstacle. A...report 2001
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Rademaker, E.R. (author), Sijtsma, P. (author), Tester, B.J. (author)Modal measurement techniques in engine intakes have been used previously to analyse the generated fan noise. A proven method is to use a wall-mounted array of Kulite transducers and operate the (model) turbofan under constant shaft speeds. A drawback of this method is the large number of (expensive) microphones and acquisition channels needed to...report 2001
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Wanhill, R.J.H. (author)Archaeological silver may be embrittled by long-term corrosion and microstructural changes. The embrittlement of artifacts increases with increasing grain size. This is explained by considering the grain boundary character and models describing the interactions between microcracks, lattice dislocations and grain boundaries. Severely embrittled...report 2001
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Blom, H.A.P. (author), Daams, J. (author), Nijhuis, H.B. (author)This paper develops a mathematical model for cognitive performance of a tactical air traffic controller in an en-route ATC context. The aim of this model-based approach is to enable the evaluation of both accident risk and aspects like cognitive workload and effectiveness of ATC in managing air traffic situations safely.Use is made of human...report 2001
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Speijker, L.J.P. (author), Blom, H.A.P. (author), Bakker, G.J. (author), Karwal, A.K. (author), van baren, G.B. (author), Klompstra, M.B. (author), Kruijsen, E.A.C. (author)The increase in air traffic implies that for busy airports, such as Schiphol, new and advanced Air Traffic Management (ATM) procedures are being developed. For some proposed ATM procedures, ICAO regulations do not yet exist and a thorough safety assessment that incorporates the role of Air Traffic Control (ATC) and pilots is required. This study...report 2001