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- van der Hoeven, W. (author) report 1988
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Verhoef, W. (author)In the past, a relatively simple radiative transfer model, based on scattering and extinction of two semi-isotropic diffuse fluxes and two direct fluxes (solar beam and radiance in the viewing direction), has been applied to vegetation canopies and to the atmosphere. This model takes little computing power, but its numerical accuracy had not yet...report 1988
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Kolkman, H.J. (author), 't Hart, W.G.J. (author), Schra, L. (author)One of the first commercially available Al-Li plate alloys, DTD XXXA-T651, produced by ALCAN International Ltd., was tested in the framework of a European cooperative programme (GARTEUR). The engineering properties were determined in a previous investigation. The present report describes the results of an additional investigation with respect to...report 1987
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- van den Assem, D. (author), Huijser, R.H. (author) report 1987
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van Es, P. (author)Van een gegeven raketkonfiguratie werden voor verschillende Machgetallen de aërodynamische krachten en momenten bepaald bij: - diverse invalshoeken van de gehele raket - een groot aantal deflekties van de vleugels. Hiertoe werd gebruik gemaakt van de numerieke prediktiemethode MISSILE 2A, die theoretisch berekende resultaten samenvoegt met een...report 1986
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van Gelder, P.A. (author)Since 1981 the National Aerospace Laboratory NLR has been involved in a research program to study the aeroelastic effects of active control systems. This research program was concentrated on the performance of a number of windtunnel tests with a dynamic windtunnel model, exhibiting "hard" flutter characteristics, lightly damped rigid body modes...report 1986
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- de Pagter, P.J. (author), Dekker, G.J. (author), Joosten, L.J.M. (author) report 1986
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Huisman, W.C. (author), Verhoef, W. (author), Okkes, R.W. (author)Rate distortion bounds are derived for SAR images and compared with the rate versus distortion relations obtained with the speckle suppression and data compression algorithm described in Part II. A method is given for optimally processing multispectral SAR-images. The method makes use of the spectral correlation between the mean return power...report 1986
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- Haasz, A.A. (author), Davis, J.W. (author), Auciello, O. (author), Stangeby, P.C. (author) report 1986
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- Haasz, A.A. (author), Auciello, O. (author), Stangeby, P.C. (author) report 1986
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Ohman, L.H. (author), Brown, D. (author), Bowker, A.J. (author), Ellis, F.A. (author)Although the NAE 5 ft X 5 ft Blowdown Wind Tunnel was conceived in the 1950's, with commissioning in 1962/63, it has stood the test of time very well and is still, in 1985, in heavy demand. We may cite three main reasons for this situation: (i) the basic wind tunnel design was fundamentally very sound, (li) the wind tunnel circuit and its...report 1985
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- Hu, T.C.J. (author), Shirouzu, M. (author) report 1985
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- Shen, F. (author) report 1985
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Walker, D.M.C. (author)The orbit of 1970-47B passed very slowly through 14th-order resonance, and the changes in orbital inclination and eccentricity have been analysed over a four-year period, from January 1977 to January 1981, using 208 US Navy orbits. The analysis has yielded values for three pairs of lumped harmonic coefficients of 14th order, which have...report 1985
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Wickens, R.H. (author)This report presents aerodynamic data on an NACA 0018 airfoil oscillating in pitch in the N AE 2m X 3m Low Speed Tunnel. The purpose of the test was to simulate the dynamic aerodynamic behaviour of a Vertical Axis Wind Turbine blade section at the equatorial plane under the dynamic stall conditions which may occur at low ratios of tip speed to...report 1985
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Abbink, F.J. (author), Pijpers, E.W. (author)This report gives an overview of the development of the airliner structure, engines and systems, and the impact on the cockpit design. The influence of the developments of micro-electronics, digital computer technology and display technology on the avionics design and cockpit lay-out of the recently introduced airliners as the Airbus A-310 is...report 1985
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Labrujere, T.E. (author)A description is given of a method for the determination of global corrections for wall interference in both solid- and ventilated wall windtunnels, 2D as well as 3D. The method is based on the assumption that the flow velocity is known at a control surface surrounding the model and that the main part of the flow field may be considered...report 1984
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- Guimaraes Cavalcanti, S. (author) report 1984
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Hoeijmakers, H.W.M. (author)A review is presented of computational methods to simulate the aerodynamics of configurations with leading-edge vortex flow. The various methods in use at present are discussed in some detail, primarily with a view towards three-dimensional steady flow applications. The strengths and weaknesses of the methods are indicated and results of...report 1984
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de Wolf, W.B. (author), Sarin, S.L. (author)This paper reviews the acoustic research carried out in the past 10 years by Fokker and NLR to support the aircraft development programmes in the Netherlands. The following subjects are highlighted, emphasizing the development of the necessary experimental techniques and design tools. For jet noise reduction the feasibility of a lined ejector...report 1984