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

Autor: Molina-Viedma ÁJ; Departamento de Ingeniería Mecánica y Minera, Campus Las Lagunillas, Universidad de Jaén, 23071 Jaén, Spain. ajmolina@ujaen.es., López-Alba E; Departamento de Ingeniería Mecánica y Minera, Campus Las Lagunillas, Universidad de Jaén, 23071 Jaén, Spain. elalba@ujaen.es., Felipe-Sesé L; Departamento de Ingeniería Mecánica y Minera, Campus Científico Tecnológico de Linares, Universidad de Jaén, 23700 Linares, Spain. lfelipe@ujaen.es., Díaz FA; Departamento de Ingeniería Mecánica y Minera, Campus Las Lagunillas, Universidad de Jaén, 23071 Jaén, Spain. fdiaz@ujaen.es., Rodríguez-Ahlquist J; Airbus Defence and Space, Paseo John Lennon s/n, 28906 Getafe, Spain. javier.i.rodriguez@airbus.com., Iglesias-Vallejo M; Airbus Defence and Space, Paseo John Lennon s/n, 28906 Getafe, Spain. manuel.iglesias@airbus.com.
Jazyk: angličtina
Zdroj: Materials (Basel, Switzerland) [Materials (Basel)] 2018 Feb 02; Vol. 11 (2). Date of Electronic Publication: 2018 Feb 02.
DOI: 10.3390/ma11020230
Abstrakt: 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.
Competing Interests: The authors declare no conflict of interest.
Databáze: MEDLINE
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