In aeronautics, hard landing is a critical condition as the aircraft approaches the runway with a vertical velocity that exceeds 2 m/s. Beyond that level, the energy that should be then absorbed by the whole structure could cause severe damage to the landing gear and the whole structural system. This document reports on the set-up, execution and results of a preparatory test campaign performed on a small landing gear (LG) demonstrator instrumented with a fibre-optic sensor system. In detail, a leaf spring landing gear was released from a drop tower to detect information about the strain state and the related acceleration history of some specific components during the impact. The objective of the present research is the development of a method for assessing whether hard landing is experienced, and to what extent. Deformation measurements through an integrated Fibre-Bragg Grating (FBG) network allowed retrieving impact velocity by a devoted, original algorithm. The proposed preliminary methodology is the base for assessing a more complex procedure to correlate structural response to the energy entering the structure during the touchdown event.

A Preliminary Assessment of an {FBG}-Based Hard Landing Monitoring System / Brindisi, Angela; Vendittozzi, Cristian; Travascio, Lidia; Di Palma, Luigi; Ignarra, Michele; Fiorillo, Vincenzo; Concilio, Antonio. - In: PHOTONICS. - ISSN 2304-6732. - 8:10(2021), pp. 1-24. [10.3390/photonics8100450]

A Preliminary Assessment of an {FBG}-Based Hard Landing Monitoring System

Cristian Vendittozzi;
2021

Abstract

In aeronautics, hard landing is a critical condition as the aircraft approaches the runway with a vertical velocity that exceeds 2 m/s. Beyond that level, the energy that should be then absorbed by the whole structure could cause severe damage to the landing gear and the whole structural system. This document reports on the set-up, execution and results of a preparatory test campaign performed on a small landing gear (LG) demonstrator instrumented with a fibre-optic sensor system. In detail, a leaf spring landing gear was released from a drop tower to detect information about the strain state and the related acceleration history of some specific components during the impact. The objective of the present research is the development of a method for assessing whether hard landing is experienced, and to what extent. Deformation measurements through an integrated Fibre-Bragg Grating (FBG) network allowed retrieving impact velocity by a devoted, original algorithm. The proposed preliminary methodology is the base for assessing a more complex procedure to correlate structural response to the energy entering the structure during the touchdown event.
2021
landing gear; drop test; hard impact; integrated sensor network; strain detection; Fibre Bragg Gratings (FBG); fibre optics; aircraft
01 Pubblicazione su rivista::01a Articolo in rivista
A Preliminary Assessment of an {FBG}-Based Hard Landing Monitoring System / Brindisi, Angela; Vendittozzi, Cristian; Travascio, Lidia; Di Palma, Luigi; Ignarra, Michele; Fiorillo, Vincenzo; Concilio, Antonio. - In: PHOTONICS. - ISSN 2304-6732. - 8:10(2021), pp. 1-24. [10.3390/photonics8100450]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1732403
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