A. Pérez de la Serna, A. J. Rodríguez Jiménez, M. Oliver, H. Climent

DOI Number: N/A

Conference number: IFASD-2015-160

Aerial delivery is a typical operation of military transport aircraft. It consists on the extraction of payload while the aircraft is flying with the ramp open. The pallets are moved towards the rear of the fuselage and the ramp until they leave the aircraft. The extraction may be done either by gravity or using a parachute. These pallets release creates a dynamic response in the ramp that is transmitted to the rear fuselage. In addition the aircraft may encounter atmospheric turbulence that produces loads that have to be analysed. The result is a set of scenarios that are critical for the ramp, ramp-fuselage interface and rear fuselage. The aerial delivery dynamic loads analyses imply taking into account some parameters that are relevant for the simulations: — Non linearities in the ramp-fuselage interfaces. — Situations with variable “1g-steady flight” that leads to aircraft load factor > 1 This paper presents the continuation of the works performed at Airbus DS Military Transport Aircraft Aeroelasticity and Structural Dynamics department in the last years ([1] & [2]). It will focus on the methodology to calculate aerial delivery dynamic flight loads for a heavy military transport aircraft. Two main scenarios are analysed: — The release itself, which simulates the dynamic response of the ramp and its effect on the attachments and fuselage, which is divided in two different analyses: (cid:1) The first analysis computes the loads in the aircraft due to the pallet release. This analysis is linear and focused on obtaining the loads in the rear fuselage. (cid:1) The second analysis computes the loads in the ramp and ramp-fuselage interfaces (hinge, actuator and struts). This analysis is non-linear and more accurate in the ramp area. — The aircraft response to a discrete tuned gust produced during the extraction process: with the ramp open, before, during and after the release. Concluding remarks highlight how these results constitute a step forward in the understanding of aircraft dynamic response in this scenario. The paper will end with suggestions for further work in this topic.

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In Categories: 2. IFASD 2015, Structural Dynamics & Shimmy
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