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Open AccessArticle

Modal Parameters Evaluation in a Full-Scale Aircraft Demonstrator under Different Environmental Conditions Using HS 3D-DIC

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Departamento de Ingeniería Mecánica y Minera, Campus Las Lagunillas, Universidad de Jaén, 23071 Jaén, Spain
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Departamento de Ingeniería Mecánica y Minera, Campus Científico Tecnológico de Linares, Universidad de Jaén, 23700 Linares, Spain
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Airbus Defence and Space, Paseo John Lennon s/n, 28906 Getafe, Spain
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Author to whom correspondence should be addressed.
Materials 2018, 11(2), 230; https://doi.org/10.3390/ma11020230
Received: 11 December 2017 / Revised: 23 January 2018 / Accepted: 1 February 2018 / Published: 2 February 2018
(This article belongs to the Special Issue Advanced Materials for Transport Applications)
In real aircraft structures the comfort and the occupational performance of crewmembers and passengers are affected by the presence of noise. In this sense, special attention is focused on mechanical and material design for isolation and vibration control. Experimental characterization and, in particular, experimental modal analysis, provides information for adequate cabin noise control. Traditional sensors employed in the aircraft industry for this purpose are invasive and provide a low spatial resolution. This paper presents a methodology for experimental modal characterization of a front fuselage full-scale demonstrator using high-speed 3D digital image correlation, which is non-invasive, ensuring that the structural response is unperturbed by the instrumentation mass. Specifically, full-field measurements on the passenger window area were conducted when the structure was excited using an electrodynamic shaker. The spectral analysis of the measured time-domain displacements made it possible to identify natural frequencies and full-field operational deflection shapes. Changes in the modal parameters due to cabin pressurization and the behavior of different local structural modifications were assessed using this methodology. The proposed full-field methodology allowed the characterization of relevant dynamic response patterns, complementing the capabilities provided by accelerometers. View Full-Text
Keywords: aerospace; full-field analysis; HS 3D-DIC; operational deflection shapes; natural frequencies; experimental modal analysis aerospace; full-field analysis; HS 3D-DIC; operational deflection shapes; natural frequencies; experimental modal analysis
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Molina-Viedma, Á.J.; López-Alba, E.; Felipe-Sesé, L.; Díaz, F.A.; Rodríguez-Ahlquist, J.; Iglesias-Vallejo, M. Modal Parameters Evaluation in a Full-Scale Aircraft Demonstrator under Different Environmental Conditions Using HS 3D-DIC. Materials 2018, 11, 230.

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