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Hagmeijer, R. (author), de Boer, A. (author), Tinga, T. (author), ten Hoeve, H.J. (author)
An overview of the activities on integrated analysis of gas turbine components at the National Aerospace Laboratory NLR in the Netherlands is presented. Key elements are the multidisciplinary frame-work including Engine System Performance, Fluid Dynamics Analysis, Heat Flow Analysis, Stress Analysis and Life Assessment, and a complementary...
report 2000
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de Boer, A. (author), van Woerkom, P.Th.L.M. (author)
report 1994
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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
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de Boer, A. (author), van Woerkom, P.T.L.M. (author)
report 1993
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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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van Woerkom, P.T.L.M. (author), de Boer, A. (author)
report 1992
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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, A. (author), Ellenbroek, M.H.M. (author)
A description is given of the second problem, a clamped-free truss structure, defined in the GARTEUR Action Group 11. The measured and calculated modal data of the structure are correlated, the locations of the errors are determined and finally the finite element model of the structure is updated. These analyses are performed with the B2000...
report 1990
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Ellenbroek, M.H.M. (author), Wijker, J.J. (author), de Boer, A. (author)
At Fokker Space and Systems the measured and calculated modal data of an ARA 3-panel-clean-wing were correlated. The number of degrees of freedom (dof's) of the finite element model (FEM) is about 6400 and of the measurement 32. Three methods were used to obtain corresponding dof's namely: 1) the number of dof's of the FEM was reduced with a...
report 1989
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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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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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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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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
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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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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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de Boer, E. (author), Lindhout, J.P.F. (author)
The present report gives a brief survey of the theoretical background and the practical use of the boundary layer calculation system BOLA for the calculation of 3D laminar and turbulent boundary layers over non-developable STirfaces. A description of the driverprogram DRIBOLA which controls the BOLA processing, is included.
report 1982
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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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Lindhout, J.P.F. (author), Moek, G. (author), de Boer, E. (author), van den Berg, B. (author)
This paper gives a description of a calculation method for 3D turbulent and laminar boundary layers on non-developable surfaces. A simple eddy viscosity model is incorporated in the method. Special attention is given to the organization of the computations to circumvent as much as possible stepsize limitations. The method is also able to proceed...
report 1979
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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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