In order to refine existing wake-vortex separation distances through the application of technology, the issues associated with defining the basis for separation criteria must be addressed. This includes understanding the significance of a wake vortex encounter. To further the process of understanding the significance of such encounters, a flight simulator was used to evaluate the response of a jet-transport aircraft to wake-vortex encounters. The objective was to evaluate the response of a twin-engine, commercial jet transport to a variety of wake characteristics and operational assumptions. The study was conducted using a modified simulation of a twin-engine, commercial jet transport. The simulations included: 1) the free response of a trimmed airplane encountering a wake; 2) the response of an airplane controlled by only the autopilot; and 3) the response of an airplane controlled by a 'math pilot' designed to maintain wings level. The latter two modes of airplane control were chosen in order that the airplane response could be evaluated without incurring the variation associated with pilot-in-the-loop simulations. The strip theory used in the study provides a reasonable simulation of the forces and moments for many encounters; however, the method overestimates the yaw moments induced by the vertical tail when the airplane passes through or above the wake. The results also suggest that the dynamic response of an airplane to an encounter with a wake is dependent on the flight path through the wake. However, the limited nature of this study precludes a conclusive determination of the sensitivity of the aircraft's dynamic response to parameters such as entry height, intercept angle, and Gamma.
The dynamic response of a twin-engine, commercial jet transport to wake vortex encounters
Dynamische Antwort eines zweistrahligen Verkehrsflugzeuges auf Zusammenstöße mit Nachlaufwirbeln
1996
12 Seiten, 12 Bilder, 1 Tabelle, 9 Quellen
Aufsatz (Konferenz)
Englisch
The Dynamic Response of a Twin-Engine, Commercial Jet Transport to Wake Vortex Encounters
British Library Conference Proceedings | 1996
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