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- Leyds, F.B. (author), Fokkema, J.T. (author) journal article 1988
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- Wensink, G.J. (author), Valk, C. de (author) report 1987
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Erkelens, J.J. (author), van der Geest, P.J. (author)Due to the wide coverage volume of MLS, in both azimuth and elevation, the system enables the introduction of new approach and terminal area procedures. For several years the NLR has been investigating the potential of MLS with respect to the execution of non-straight-in approaches. In an earlier theoretical study four MLS-guided interception...report 1986
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- Dingemans, M.W. (author), Stive, M.J.F. (author), Bosma, J. (author), De Vriend, H.J. (author), Vogel, J.A. (author) conference paper 1986
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Mosselman, E. (author)A relaxation model for the response of the main wave direction to changes in wind direction is derived with a parametric approach of the energy balance of locally generated wind waves. An expression to quantify the time scale of this model is obtained from empirical growth relations of waves in a fetch-unlimited situation. The model is compared...master thesis 1985
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Kimura, A. (author)This report deals with second order, two-dimensional low frequency waves induced by the non-linear interactions of the first order component waves in a two-dimensional short wave field. The convolution to calculate the averaged two-dimensional low frequency wave spectrum is developed. Any given two-dimensional short wave spectrum can be used as...report 1984
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Pennekamp, J.G.S. (author), Booij, R. (author)In order to make predictions for the morphology of an alluvial bottom a thorough knowledge of the flow pattern is needed. In tidal channels, without a nett discharge over the tidal period, the main flow effects on the morphology will, on an average, remain relatively small because of the tidal variation. Therefore second order flow phenomena...report 1983
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- van Gool, M.F.C. (author) report 1982
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Pietersen, O.B.M. (author), Klinker, F. (author)An analysis is given of possible interference induced by a position marker system, called RASP, into aircraft radio altimeters. The RASP system is used as a marker beacon in flight tests for trajectory measurements, and operates on 4.3 GHz. It is concluded that radio altimeters will not experience any harmful interference from a RASP transmitter.report 1981
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Holthuijsen, L.H. (author)The objective of the present study is to determine characteristics of the directional energy distribution of wind generated waves on the basis of observations with a relatively high resolution. Approximately 75 observations of the above distribution are studied. They are selected from five spectra which are determined from stereophotographic...doctoral thesis 1981
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Mom, A.J.A. (author)This paper consists of two parts. In the first part, concerning operational conditions in gas turbines, the following topics are covered: - the magnitude of temperatures, temperature profiles, and stresses in various components - transient temperature conditions, occuring as a result of e.g. throttle setting changes and affecting thermal fatigue...report 1981
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Laan, J.N. (author)It is concluded from this limited analytic study of pure tone sound suppression in a cylindrical duct with uniform flow, based on the mode matching technique, that the optimum of the liner impedance heavily depends on the source distribution and also on the length of the duct.report 1981
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van der Vooren, J. (author), Huizing, G.H. (author)A method is discussed for the calculation of inviscid transonic flow about thin airfoils in moderately slow unsteady motion. It is an extension of a method which was developed by Ballhaus and Goorjian of NASA Ames and which is applicable for strictly slow unsteady motions only. The modifications involve extra unsteady terms in the boundary...report 1980
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de Boer, W.P. (author), Mooij, H.A. (author), van Gool, M.F.C. (author)The application of Active Control Technology concepts and in particular the Relaxed Static Stability principle in certain categories of future transport aircraft will lead to the introduction of primary flight control systems incorporating full-time stability augmentation. For this category of transport aircraft adequate handling quality...report 1979
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Laan, J.N. (author)A set of equations is presented for the sound propagation in an axisymmetric multisectional duct. For each side of a source section the combined duct effects of transmission, reflection and absorption are reduced to one matrix of coefficients. The procedure is compatible with a source description which takes the feedback of the sound field into...report 1979
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Laan, J.N. (author), Schulten, J.B.H.M. (author)The present status of a method to calculate the generation, transmission and radiation of fan noise is described. A steady uniform flow is assumed in the whole field. A hard-walled circular duct is considered which is terminated at the open end by an infinite baffle. The source mechanism is the impingement of wakes from an upstream blade row...report 1978
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- Wanhill, R.J.H. (author) report 1977
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Mooij, H.A. (author)The introduction of fly-by-wire primary flight control systems in certain categories of future transport aircraft, makes it highly desirable to initiate further studies into handling quality criteria for future guidance in system design and airworthiness certification. The handling quality criteria for such aircraft must be based on parameters...report 1976
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Laan, J.N. (author)In this report the sound propagation in a hard-walled annular duct of finite length is investigated. The individual modal solutions so found are described. The main properties which are calculated in the present report, are the modal intensity and the modal far field directivity pattern. The modal intensity is determined by the rate of mode...report 1975