Investigation of a cross-coupling drift compensation method on a single axis gyro stabilized platform

In this report the phenomenon of cross-coupling drift (both S-IA and S-OA) due to vehicular angular movements is investigated. In a hardware test set-up, using an experimental Single Axis Platform composed of surplus parts from the former Eldo-A program, the theoretical result as well as a proposed method of compensation is verified.

Gedaechtniseffekte in der Turbulenz

NOTE: REPORT IN GERMAN, ONLY THE ABSTRACT IS IN ENGLISH Memory effects in the flow of fluids are known long since. One has to reckon with such effects when studying the flow of non-Newtonian fluids, for instance when they exhibit a visco-elastic behaviour. Certain phenomena in turbulence also seem to point towards a visco-elastic behaviour. If,...

Calculation of the flow around a swept wing, taking into account the effect of the three-dimensional boundary layer. Part I: Wing with turbulent boundary layer

The attached flow around a swept wing has been calculated with allowance for the effects of boundary layer and wake. The outer potential flow has been computed with an adapted version of the NLR panel method. The displacement effect of the boundary layer and the wake has been taken into account by the outflow concept. For the calculation of the...

Propagation of short gravity waves in shoaling waters: Refraction and diffraction

In this report,a description is given of some approximation methods, to solve the problem of short wave propagation in shoaling water. The problem is stated as an elliptic initial value problem, which is in general not properly posed. After reduction of the wave equation to the Helmholtz equation, the transition to amplitude and phase is...

The thickness effect in plane stress fracture toughness

Residual strength tests were carried out on center cracked aluminium alloy panels of various thicknesses. Slow crack growth, crack opening displacements and compliances were recorded. In addition to the test data, the report presents discussions on the residual strength "behaviour, the thickness effect, R-curves and COD and compliance measurements

Comparison of Fokker F28 wind tunnel and flight data; a summary

For an accurate prediction of aircraft characteristics the wind tunnel tests are of paramount impoitance. Therefore the significance of the test results and available extrapolation techniques have to be investigated as thoroughly as possible. For this reason a program for comparing wind tunnel and flight test data of the Fokker F-28 was set up,...

Fysical-engineering model of reinforced concrete frames in compression

A calculation of the complementary moments due to second-order effects and the analysis of the stability of reinforced concrete framed structures can be conceived as follows. With the aid of a computer a very large number of M-N-x diagrams can be produced on the basis of the standard specified stress-strain diagrams for concrete and steel. A...

Memory Effect in a Turbulent Boundary-Layer Flow Due to a Relatively Strong Axial Variation of the Mean-Velocity Gradient

Measurements have been made of the distributions of mean velocity, turbulence intensities and turbulence shear-stress in a turbulent boundary-layer downstream of a hemi-spherical cap attached onto the plane rigid wall. The eddy-viscosity, when computed in the classical way according to Boussinesq's concept from the lateral gradient of the mean...

Calculation of the displacement effect in two-dimensional subsonic attached flow around aerofoils: examples of calculations using measured displacement thicknesses

Using measured displacement thicknesses the classical displacement effect on lift and pressure distribution has been calculated for a number of aerofoils in viscous attached flow. For this purpose the displacement concept boundary condition (in its "leak flow" form) has been incorporated in a potential flow calculation method that uses a...

Manuscripten van H.J. Schoemaker uit de periode 1946-1971: Deel C: Getijden, Getij-reproductie en Getij-analyse

C1: Getijstromen in zee (1962) C2: Roterende coördinatiesystemen; centrifugale kracht en Coriolis-kracht1 (1958) C3: Invloed van aardrotatie bij waterloopkundig onderzoek² (1958) C4: Roterende cylinder in een parallelstroom tussen twee evenwijdige wanden (1958) C5: Reproduction of geostrophic effects in hydraulic models by means of the Magnus...

Reproductie zouttoestand getijrivieren (VI): Reproductie Rotterdamse Waterweg in getijgoot

Het Magnus-effekt bij cylindrische tollen met schijven en de toepasbaarheid in hydraulische modellen

Reproductie van de geostrofische versnelling in M1000

Duwvaart in kanalen, deel V: Passeermanoeuvres

Duwvaart in kanalen, deel III: Schaaleffecten in scheepvaartmodellen

Duwvaart in kanalen, deel IV: Schaaleffecten in scheepvaartmodellen (samenvatting modelonderzoekingen)

Geleidelijke sluiting III: Stabiliteit van een dam opgebouwd uit normale of vaste zandzakken