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Wewerinke, P.H. (author)This paper deals with the resiilts of a theoretical and experimental program concerning human monitoring behavior. Apart from monitoring an automatic approach combined monitoring and manual flight director control was studied to determine the interference between subtasks. Also simultaneously monitoring and auditory tracking was included. The...report 1976
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't Hart, W.G.J. (author)Some residual strength tests have been performed on 610 mm wide centre-cracked panels at a temperature of -50 C, in order to examine whether equal Ke values are obtained as for 300 mm wide panels, tested at -50°C. This work is a continuation of the residual strength investigation reported in NLR TR 76103 and NLR TR 75168.report 1976
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- King-Hele, D.G. (author), Walker, D.M.C. (author) report 1975
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Olivari, D. (author)This note describes some experimental results obtained by investigating the behaviour of a pulsated turbulent, circular jet using a synchronous frequency sampling technique. Results are given for the development of mean velocity profiles, decay of centerline velocity, both as function of time inside a period and of the distance from the nozzle....report 1974
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Tiggelaar, J.J. (author)A comparison is made of some formulas and integration rules for computing the duration correction to aircraft noise. It is found that the calculation procedure "by integration of the noise history is approximated to within O.5 to 1.0 dB hy a closed formula in most practical cases (excluding sharp turns, for example). Further, the steplength of...report 1973
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Kacprzynski, J.J. (author)Results of a second investigation of the shockless lifting airfoil No. 1, performed in the improved NAE high Reynolds number 15 inch x 60 inch two-dimensional test facility, are presented. Better agreement with theoretical design conditions is demonstrated. Off-design characteristics for several Mach numbers are analysed, particularly with...report 1973
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van der Vooren, J. (author), Slooff, J.W. (author)Properties of inviscid isentropic flow models underlying finite difference methods for the calculation of two-dimensional transonic flows with embedded shocks about airfoils are discussed and compared. Attention is drawn to the fact that the isentropic time-dependent model described by Magnus and Yoshihara and the isentropic model used in...report 1973
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Backx, E. (author)This report gives an estimation of vibrational frozen temperatures in the testing reg10n for the range of running conditions used in the von Karman Institute Longshot hypersonic wind tunnel. To assess the extent of the non-equilibrium effects caused by the vibrational freezing, the static temperature and pressure variation along the nozzle are...report 1972
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- Allen, G.A.S. (author) report 1971
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- Davis, P.L. (author) report 1971
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Hockenhull, B.S. (author), Owston, C.N. (author), Hacking, R.G. (author)An improved 20kHz fatigue apparatus has been constructed. This equipment allows tests at up to 50% higher strain levels than those achieved with earlier apparatus and also has the facility of control of amplitude, force or power during test. Preliminary evolution tests have been made on the equipment and these are described. Starting in 1946 as...report 1970
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- Poinssot, J.C. (author) report 1969
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- de Jong, J.L. (author), van Ingen Schenau, H.A. (author), Pietersen, O.B.M. (author) report 1969
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Trenouth, J.M. (author), Grzedzielski, M.S. (author)Although optically isotropic, niobium and the niobium alloys B66 and FS85 can be made to respond to polarized light by a suitable etching treatment. The etching technique and possible uses of the ensuing activity in polarized light are described. New evidence that the activity of such isotropic metals is due to the surface topography is...report 1969
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South, P. (author)This Report describes an experimental investigation of the model lift coefficients required to cause flow breakdown in low speed wind tunnels having test section breadth-to-height ratios of 0.5. 1.0, and 2.0. A family of jet flap wing models was used in the investigation. The model height-to-span, the momentum-area-to-tunnel-area, and the model...report 1968
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Enkenhus, K.R. (author), Parazzoli, C. (author)An approximate analytical solution is presented for the free-piston cycle in the VKI Longshot Hypersonic Tunnel. The Longshot differs from a conventional gun tunnel in that a heavy piston is used to compress the nitrogen test gas, which is then trapped at the end of the barrel at very high pressure by the closing of a system of check valves as...report 1968
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Makomaski, A.H. (author)A method, together with a FORTRAN IV computer program, is presented for the calculation of the trajectory and properties of a shock wave generated on normal reflection of an idealized gaseous detonation wave in a tube. The detonation wave is assumed to be formed by energetic ignition resulting in zero detonation induction distance. The...report 1967
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Schijve, J. (author), de Rijk, P. (author)Constant-amplitude tests and simplified flight-simulation tests with 10 or 50 gust cycles per flight were performed. The effect of the ground-to-air cycle is compared with the Palmgren-Miner prediction. Optical and electron microscope observations of the fracture are presented.report 1966
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Mooij, H.A. (author)In dit rapport wordt een onderzoek beschreven dat werd uitgevoerd om de stabiliteits- en besturingsafgeleiden van het stelsel bewegingsvergelijkingen voor de dwarsbeweging van het Queen Air laboratoriumvliegtuig van het NLR te bepalen. Twee vliegtuig- en vliegtoestanden zijn onderzocht. Een vooronderzoek was erop gericht met een analoge...report 1966
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Picken, J. (author), Greenwood, G.H. (author)Local heat transfer and surface pressure were measured on a caret wing incorporated in a four-wing Maikapar body. The design Mach number was 2.47 and the design incidence 12.130. Data were obtained over a Mach number range of 1.6 to 3.6 at Reynolds numbers based on ridge line length and free-stream conditions of up to 24 million. Transition...report 1965