Emmanuel Sunil

A conceptual third party risk model for personal and unmanned aerial vehicles

A conceptual third party risk (TPR) model is developed, implemented, and tested to demonstrate the capability of determining the risk to the population in a metropolitan city exposed to personal aerial vehicles (PAVs) and unmanned aerial vehicles (UAVs) traffic operations. The conceptual model that is primarily based on the methodology and experience of risk modelling for conventional aircraft is modified and the parameters are adjusted suitable for a determination of risk in the arrival, departure and cruise phase of flight for those new aircraft types. Without the availability of the empirical accident data of these aircraft, however, a validation of the conceptual model is not possible. For the purpose of comparison of different future operation concepts and different scenarios in a metropolitan area the model suffices the need. Two examples of operation concepts and traffic scenarios for PAV and UAV aircraft movements, respectively, are demonstrated.

Analysis of Airspace Structure and Capacity for Decentralized Separation Using Fast-Time Simulations

The work that is presented in this paper is part of an ongoing study on the relationship between airspace structure and capacity. The present paper investigates the degree of structuring needed to maximize capacity for decentralized en-routeairspace. To this end, four decentralized en-route airspace concepts, which vary in terms of the number of constrained degrees of freedom, were comparedusing fast-time simulations, for both nominal and non-nominal conditions. The airspace structure-capacity relationship was studied from the effect of multiple traffic demand densities on airspace metrics. The results indicated that structuring methods that over-constrained the horizontal path of aircraft reduced capacity, as traffic demand displays no predominant patterns in the horizontal dimension for decentralization. The results also showed that capacity was maximized when a vertical segmentation of airspace was used to separate traffic with different travel directions at different flight levels.This mode of structuring improved performance over completely unstructured airspace by reducing relative velocities between aircraft cruising at the same altitude,while allowing direct horizontal routes.