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Bruun, P. (author)Overview of procedures to protect the coastline of Florida.report 1964
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- Abkowitz, Martin A. (author) book 1969
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Campfens, S.F. (author), Zandvliet, S.B. (author), Meskers, C.G.M. (author), Schouten, A.C. (author), Van Putten, M.J.A.M. (author), Van der Kooij, H. (author)Abstract The possibility to regain motor function after stroke depends on the intactness of motor and sensory pathways. In this study, we evaluated afferent sensory pathway information transfer and processing after stroke with the coherence between cortical activity and a position perturbation (position-cortical coherence, PCC). Eleven subacute...journal article
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de Vos, D.M. (author)An investigation on a two-dimensional wing model with a double-slotted trailing edge flap is described where tunnel wall boundeo'y layer control by blowing was applied to prevent premature flow separations at the junctions between the model and the tunnel walls. From the results it is concluded that tunnel wall boundary layer control at the wall...report 1973
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- Boersma, G. (author), Sonnenschein, F.J. (author) report 1973
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Tijdeman, H. (author), Zwaan, R.J. (author)Possibilities to develop calculation methods for oscillating wings in transonic flow are discussed. Special attention is given to the question of linearisation. Recent NLR results of pressure measurements on an aerofoil with flap in transonic flow are analysed. Correlations are made between steady, quasi-steady and unsteady results. Shock motion...report 1973
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- Tijdeman, H. (author), Schippers, P. (author) report 1973
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Boersma, G. (author), Sonnenschein, F.J. (author)Due to the finite stiffness of rotor- and gimbal-suspensions, a double gimballed momentum wheel will oscillate with high natural frequencies. The stability of these oscillations is studied, in order to obtain requirements for the stiffness of the suspensions and/or the gimbal inertia properties. From energy considerations, it is concluded that...report 1973
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Wewerinke, P.H. (author)This report presents the results of an experimental program which was conducted to evaluate a linear rate field display. Various display formats are investigated. The status display configurations are compared with a flight director configuration whose design is briefly described and based on modern manual control theory. The experimental...report 1974
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Boersma, G. (author), Sonnenschein, F.J. (author)In this report the requirements of orbit control of geostationary communications satellites are investigated. A comparison between chemical and electrical propulsion is made for mission lives up to I5 years. The mass of electrical propulsion is lower than of chemical syetems, even when mass penalties for the low reliability of the ion thrusters...report 1974
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Stahlie, T.J. (author)The numerical integration of a non-linear function f(a (t), ap(t),.. a (t)) vith mutually independent variaties a, is considered for the case that the initial conditions for the integration process and time series of a, are determined by experiment. In order to minimize the error in the result of the integration process a technique is developed...report 1974
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Wewerinke, P.H. (author)A theoretical and experimental program was conducted to study human response characteristics in a variety of single- and dual-axis control situations. The object was to build and support a human control effort model. The aspect of human controller's effort is indispensable for a complete description and prediction of human operator behavior and...report 1974
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van Gool, M.F.C. (author), Mooij, H.A. (author)Servo-analysis techniques, using mathematical models of human control behaviour, are effectively used in studies of the system formed by the human pilot and the flight control system/aircraft combination. Measurement and data analysis techniques for the determination of pilot describing function, remnant and associated information needed in...report 1975
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Erkelens, L.J.J. (author), Schuring, J. (author)For the low wing-loading aircraft, considered in this investigation, vertical acceleration appeared to be an important factor concerning passenger comfort. To reduce vertical motions, a ride-comfort improvement system was introduced. Determination of parameters of the system, like gains and allowable performance limitations, required analog...report 1975
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Pool, A. (author)The paper starts with a review of the history of the use of models and statistical data for the assessment of separation standards. This work was mainly done by the ICAO Vertical Separation Panel, the North Atlantic Systems Planning Group and the ICAO Panel for the Review of the General Concept of Separation. After a brief description of the...report 1975
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Mooij, H.A. (author), van Gool, M.F.C. (author)After introductory background information on the landing approach piloting task and some arguments for expanding the knowledge on handling quality criteria for certain advanced transport designs, results are given of flight tests related to the effect of positive stick force stability on the longitudinal controllability in the landing approach...report 1976
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van Woerkom, P.T.L.M. (author)The document contains a general theory towards the observation and optimal control of disturbed, target following aerospace systems. Disturbed, target following aerospace systems eire defined as aerospace systems that are designed to track a moving target system, while they are subjected to external, time-varying disturbances. The first five...report 1976
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Prins, J.J.M. (author)The existing fine attitude system of the Astronomical Netherlands Satellite was designed on the basis of conventional digital control techniques. The possibility of a more advanced approach is presented in this report. As an example, an alternative control algorithm for the scan mode has been developed with the use of state estimation and state...report 1976
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Delil, A.A.M. (author)The scope of this report is: - to give a short description of the possible operation principles and applications of heat pipes - to derive the governing equations for a model of a conventional heat pipe (including the limits to the heat transfer capability) - to describe the theoretical derivation of the formulae for the various thermal...report 1976
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Wewerinke, P.H. (author)This paper deals with a theoretical framework describing human operator's participation in manned vehicle systems. Herewith, the human operator is described in terms commensurate with those used for other system elements, which is desirable because of the complex interaction between human functioning and his task environment (e.g. cockpit i...report 1976