Predicting Near-Ground Vortex Lifetimes Using Weibull Density Functions

Abstract

To mitigate safety hazards posed by near-ground vortex lateral transport, under instrument flight rules (IFR), parallel runway operations must adopt aircraft spacing standards that often reduce capacity. Once the phenomenon of lateral transport is understood, it is conceivable that, under IFR, new separation standards could restore some runway capacity. In this context, it is of interest to establish the probability that a wake vortex is still surviving in lateral transport t seconds after it began migrating. This paper applies survival data analysis methods to demonstrate how to generate predictions of survival probability that are specific to aircraft type. Modeling assumptions lead to a family of Weibull probability densities, a form that is useful for modeling wind phenomena.

Influence of Disinfectants on Airport Conveyor Belts

“…Thanks to its versatility and relative simplicity, the Weibull distribution is also widely used in material engineering for the analysis of different kinds of materials, including metals and their alloys [8,9], ceramics [20], plastic materials [21,22], and asphalt mixtures [23]. Nowadays, research in the area of composite materials is very extensive, in connection with statistical predictions and probability models based on the Weibull distribution [24][25][26].…”