Purpose
The purpose of this study is to provide an alternative graph-based airspace model for more effective free-route flight planning.
Design/methodology/approach
Based on graph theory and available data sets describing airspace, as well as weather phenomena, a new FRA model is proposed. The model is applied for near to optimal flight route finding. The software tool developed during the study and complexity analysis proved the applicability and timed effectivity of the flight planning approach.
Findings
The sparse bidirectional graph with edges connecting only (geographically) closest neighbours can naturally model local airspace and weather phenomena. It can be naturally applied to effective near to optimal flight route planning.
Research limitations/implications
Practical results were acquired for one country airspace model.
Practical implications
More efficient and applicable flight planning methodology was introduced.
Social implications
Aircraft following the new routes will fly shorter trajectories, which positively influence on the natural environment, flight time and fuel consumption.
Originality/value
The airspace model proposed is based on standard mathematical backgrounds. However, it includes the original airspace and weather mapping idea, as well as it enables to shorten flight planning computations.
This article describes some of tasks carried out as a part of an international project ERA (Enhanced RPAS Automation, RPAS -Remotely Piloted Aircraft Systems). The works were focused on a control system for an optionally piloted aircraft MP-02 Czajka, especially on adapting the control system for piloting the aircraft in take-off and landing phases. The entry point was the control system built on using PID controllers in the aircraft. The quality of the control system was insufficient; especially for steering in critical flight states such as take-off and landing. The aim was to improve and fine-tune it to the object, which would allow to shorten time constants of the system, reduce overshoots and errors. It was decided to leave a general structure of a control algorithm based on PID controllers, however, it was extended with additional elements, among others blocks of additional damping, "fit forward" blocks and others. The article describes control laws and their modification as well as effects on steering in longitudinal motion, primarily an angle of pitch of the aircraft, as well as lateral movement, by controlling an angle of roll and a course of the aircraft.
A new software tool for web-server clusters development is presented. The tool consist of a set of predefined Hierarchical Timed Coloured Petri Net (HTCPN) structures-patterns. The patterns make it possible to naturally construct typical and experimental server-cluster structures. The preliminary patterns are executable queueing systems. A simulation based methodology of web-server model analysis and validation has been proposed. The paper focuses on presenting the construction of the software tool and the guidelines for applying it in cluster-based web-server development.
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