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de Boer, A. (author), van Woerkom, P.Th.L.M. (author)
report 1994
document
Velldman, A.E.P. (author), Lindhout, J.P.F. (author), de Boer, E. (author)
A description is given of VISIAN - a simulation method for 2-D viscous flows with strong viscous-inviscid interaction. The mathematical mode and the numerical algorithm are presented. VISIAN has been coupled with the inviscid-flow solver TRAPS. Results are shown for a number of airfoils; a comparison is made with results from other computations...
report 1988
document
van den Berg, B. (author), Piers, W.J. (author), de Boer, E. (author)
The attached flow around a swept wing has been calcTilated with allowance for the effects of boundary layer and wake. In part I a swept wing was considered with a turbulent boundary layer on both the upper and lower wing surface. The present part of the study deals with the calculation of the flow around the same swept wing with a laminar...
report 1977
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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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Riks, E. (author), Merazzi, S. (author), de Boer, A. (author)
In many practical problems of plate and shell buckling, the pre-buckling state is linear and can be obtained from the linearized equations of elasticity. The computation of the buckling load and mode in such cases correponds to a linear eigenvalue problem that can easily be formulated and implemented in a finite element code. This report...
report 1988
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Bunnik, N.J.J. (author), Verhoef, W. (author), de Jongh, R.W. (author), van Kasteren, H.W.J. (author), Geerts, R.H.M.E. (author), Noordman, H. (author), Uenk, D. (author), de Boer, T.A. (author)
Canopy reflectance simulation studies have demonstrated that a simplified relation between leaf area index and reflectance exists for the hot-spot observed at a zenith angle of approximately 52°. Based on this principle a prototype ground-based hot-spot reflectance meter (HSM) has been developed and tested, The objective of the project is to...
report 1984
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de Boer, W.P. (author), Huynh, H.T. (author), Nicholas, O.P. (author), Schafranek, D. (author), van Engelen, J.A.J. (author)
This report contains a summary of the main conclusions and recommendations from extensive work performed by the Flight Mechanics Action Group on Handling Qualities (FM/AGOl) of the Group for Aeronautical Research and Technology in Europe (GARTEUR). The work of this Action Group, which involved cooperation between research institutes of France ...
report 1990
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de Boer, J.B. (author), van Oosterom, T. (author)
report 1961
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de Boer, W.P. (author)
report 1972
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Ellenbroek, M.H.M. (author), de Boer, A. (author)
Fokker Space and Systems and the National Aerospace Laboratory NLR performed a study to integrate more systematically the experimental and analytical analysis of the dynamic behaviour of structures. The study focused on the correlation of experimental and analytical data, matrix and parameter updating methods. In this paper an overview will be...
report 1993
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Lindhout, J.P.F. (author), de Boer, E. (author)
A method is presented to compute the 3D compressible turbulent boundary layer on an adiabatic wall under infinite swept wing conditions. The mathematical model of turbulence is based on a generalisation of Bradshaw's 2D shear stress equation. This results in a system of 5 equations valid along 5 distinct characteristics. A brief discussion is...
report 1975
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de Boer, W.P. (author)
In this study the dynamics of very large aircraft in the landing approach are discussed. The flight dynamics of the DC-8 and Boeing-747 are compared with those of hypothetical very large aircraft. These hypothetical aircraft have landing weights of 1, 2 and 4x10(6) lbs. Aircraft data and stability and control derivatives for these hypothetical...
report 1971
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van Woerkom, P.T.L.M. (author), de Boer, A. (author), Ellenbroek, M.H.M. (author), Wijker, J.J. (author)
A brief description is given of the European Robot Arm (ERA), and its intended application to assembly, maintenance, and servicing of the Russian segment of the International Space Station Alpha. The need for manipulator simulation is recalled, and ERA simulator development is outlined. System characteristics that must be modelled for...
report 1994
document
de Boer, A. (author), Riks, E. (author)
In this report a description is given of the nonlinear package of B2000. The set-up of the continuation procedure which controls the nonlinear calculations is explained. At some points the existing continuation procedure was modified to enhance its performance. The nonlinear package contains a nonlinear rod element and a nonlinear thick shell...
report 1988
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van Woerkom, P.T.L.M. (author), de Boer, A. (author)
report 1992
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Zandbergen, T. (author), de Boer, E. (author)
A computer program written in Fortran IV and based on the method of Levinsky has been developed for the calculation of the spanwise lift distribution on wings with deflected slipstreams. This report gives a description of Levinsky's method and detailed information on the computer program. Results of computations are compared with experimental...
report 1972
document
Bunnik, N.J.J. (author), Verhoef, W. (author), de Jongh, R.W. (author), van Kasteren, H.W.J. (author), Geerts, R.H.M.E. (author), Uenk, D. (author), de Boer, T.A. (author)
A new ground-based hot-spot reflectance meter (HSM) has been developed and tested for the estimation of green crop biomass and for crop growth monitoring. The concept of the HSM is based on theoretical studies on canopy hotspot reflectance measurements for a selected oblique illumination and view angle of 52° with respect to the vertical. A...
report 1983
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Lindhout, J.P.F. (author), de Boer, E. (author), van den Berg, B. (author)
A computational method is presented for threedimensional turbulent boundary layers. The turbulence model is a simple eddy-viscosity formulation. An hybrid difference scheme is used, which has the robustness of first order schemes and accuracy of second order schemes. The boundary layer is computed in the region of determinacy of the initial data...
report 1982
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Lindhout, J.P.F. (author), de Boer, E. (author)
This report consists of two parts. The first part describes a finite-difference scheme for the computation of 3D laminar boundary layers over developable surfaces. The stability of the first variation of the difference scheme is investigated. Some results of actual boundary-layer calculations are presented for flows over swept wings. The second...
report 1976
document
Dieleman, P. (author), de Boer, A. (author)
This technical note gives the results of the work carried out in the workpackage on Compliance Matrix Determination (WP 2202) as carried out by NLR during the HERA phase CO contract. During operations with the HErmes Robot Arm (HERA) situations will occur in which the End-Effector (EE) of the manipulator has mechanical interaction with its...
report 1989
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