Analysis of the NLR airports pollution dispersion model on sensitivity for meteorological parameters and on source modeling

The NLR airports pollution dispersion model is analysed with regard to sensitivity for meteorological parameters and the modeling of the sources of pollution (i.e. airplanes). It is found that the weather resolution of the model is satisfactory in view of the present standards of meteorological measurement. Atmospheric stability (Pasquill class)...

A non-stationary model for atmospheric turbulence patches, for the prediction of aircraft design loads

In this report a model for atmospheric turbulence is proposed. It is assumed that atmospheric turbulence appears in patches and that within the patches the turbulence can be described as a modulated Gaussian process. Statistical properties of this model and of atmospheric turbulence are compared. Using data from various sources a probability...

Some investigations on the notching procedtire used in shaker tests on satellites

The notching procedure as used in the shaker test on a satellite is critically examined. In stead of the notching procedure an alternative test set-up, in which the dynamic interaction between launcher and spacecraft is taken into account, has been proposed and investigated for a simple model of launcher and satellite. Using this test set-up the...

Equations for the response of an airplane to non-stationary atmospheric turbulence patches

In this report a method is described to calculate the load exceedance curve for a linear system having a finite, modulated Gaussian process as input. The derivation is based on the use of ensemble averages, defined as the expected values at a certain point of time. The equations can be used for any airplane-transfer function for which the Power...

Airfoil design by the method of singularities via parametric optimization of a geometrically constrained least squares object function

The present report describes a method for the design of airfoils in incompressible flow which, subject to geometrical constraints generate approximately a given distribution of the pressure coefficient along the projection of the airfoil chord on an axis parallel to the onset flow. The flow is simulated by means of a distribution of...

Conditional Recurring Sequences

The theory of linear recurring sequences is generalized to the case of a limite set of generating functions. Sequences generated by such a set are called conditional recurring sequences and their properties are are investigated. Several examples are given.

Comparison between the statistical discrete gust method and the power spectral density method

The Power Spectral Density method and the Statistical Discrete Gust Method to calculate aircraft design loads due to atmospheric turbulence are compared qualitatively and quantitatively on the basis of the load exceedance curves for certain aircraft models. It is shown that both methods are related to each other, giving the same results for...

Human pilot describing function, remnant and associated information for pitch attitude control: in flight and ground-based tracking experiments

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...

Evaluation and development of water wave theories for engineering application, vol 2: Tabulation of dimensionless stream function theory variables

Table for wave computations.

Manuscripten van H.J. Schoemaker uit de periode 1946-1971: Deel G: Diversen

G1: Verband tussen Fourier-reeks en Fourier-integraal (1959) G2: Isoklinen en Isobachen (1957) G3: Berekening van coëfficiënten in exponentiële functies (1960) G4: Groei van een delta (1958) G5: Influence of bottom roughness on current patterns in freesurface flow (1958) G6: Virtuele massa bij golfklappen en daarop volgende trillingen in een...

Recent results obtained from a numerical wave theory for highly nonlinear shallow water waves

Analytical representation of shallow water wave phenomena is complicated due, in part, to the fact that nonlinear features are important in a predominant number, if not all , problems of shallow water wave motion. It therefore may not even be approximately valid to utilize the Airy wave theory and to assume that various wave components behave...

Error-Bars in Semi-Parametric Estimation

In in vivo metabolite-quantitation with a magnetic resonance spectroscopy (MRS) scanner, the model function of the attendant MRS signal is often only partly known. This unfavourable condition requires semi-parametric estimation. In the present study the unknown part is the form of the decay function of the MRS signal. The lack of knowledge is...

Investigating an automated method for the sensitivity analysis of functions

Automated sensitivity analysis approaches in system dynamics focus primarily on model parameters. Although table functions are often subjectively approximated, they do not form the focus of most sensitivity analyses. Recently, a promising approach that allows automation of sensitivity analysis on functions was proposed by Hearne (2010), but the...

Maximal functions, factorization, and the R-boundedness of integral operators

We generalize a recent result on the ℓs-boundedness of a family of integral operators from the weighted vector-valued Lp(Rd,w;Lq(Ω)) setting to the weighted vector-valued Lp(Rd,w;X) setting for a large class of Banach function spaces X. For this we first extensively study the first part of an unpublished manuscript on the factorization of ℓ2...

Stream function wave theory: Validity and application

The engineer required to calculate theoretical wave characteristics such as wave profiles and wave forces and moments on piling, is confronted with a problem which includes (1) selecting one of a number of available theories and (2) calculating the required information which, for some of the theories, is a relatively complicated procedure. This...