Papers by Vincenzo D'Alessandro
A review of the vibroacoustics of sandwich panels: Models and experiments
V. D'Alessandro, G. Petrone, F. Franco, S. De Rosa. A review of the vibroacoustics of sandwich panels: Models and experiments, Journal of Sandwich Structures and Materials September, 2013, vol. 15 no. 5, Pages 541-582 , Sep 2013
This paper reviews the most significant works in literature about the acoustic behaviour of sandw... more This paper reviews the most significant works in literature about the acoustic behaviour of sandwich panels, starting from the first examples of multi-layered structures, comprising a series of different layers enclosing an air-gap, to the actual configurations in which the opportunities of emerging manufacturing technologies are considered in the design stages. The focus is on presenting an exhaustive list of dedicated and validated models, which are able to predict the sound transmission through sandwich panels according to their specific configuration. Some experimental works, aimed to the model correlations, are reviewed, too.
Nonlinear Vibrations of Laminated and Sandwich Rectangular Plates with Free Edges, Part 2: Experiments & Comparisons
F. Alijani, M. Amabili, G. Ferrari, V. D’Alessandro. Nonlinear vibrations of laminated and sandwich rectangular plates with free edges. Part 2: Experiments & comparisons, Composite Structures, Volume 105, November 2013, Pages 437-445, ISSN 0263-8223, Nov 2013
Large-amplitude (geometrically nonlinear) forced vibrations of completely free sandwich rectangul... more Large-amplitude (geometrically nonlinear) forced vibrations of completely free sandwich rectangular plates are investigated experimentally. Harmonic excitation is applied by using an electro-dynamic exciter and the plate vibration is measured by using laser Doppler vibrometers. A scanning laser Doppler vibrometer is used for experimental modal analysis since it provides non-contact vibration measurements with very high spatial resolution. The large-amplitude vibration experiments are carried out by using a single point laser Doppler vibrometer and a stepped-sine testing procedure. The nonlinear frequency response curves are obtained by increasing and decreasing the excitation frequency in very small steps at specific force amplitudes controlled in a closed-loop. The experimental results are compared to numerical simulations obtained by reduced-order models and show very good agreement. The nonlinear damping is experimentally obtained as a function of the vibration amplitude.
V. D'Alessandro, M. Amabili, S. De Rosa, F. Franco. Preliminary identifications of sandwich panels. In Proceedings of NOVEM2012 Conference “Noise and Vibration: Emerging Methods”, Sorrento 01-04 April 2012 ISBN: 9788890648403, Paper # 20. 10 pag., Apr 1, 2012
Sandwich panels are extensively analyzed and used in the transportation field due to their specif... more Sandwich panels are extensively analyzed and used in the transportation field due to their specific strength and stiffness values, higher than the metal homogeneous. Often, it is highlighted that one of the main drawbacks is related to their increased acoustic emissions, which especially in the past has limited their use in the application where a high level of comfort is required. In the last decade, new types of core for sandwich panels have been designed to obtain good structural and acoustical performances. In order to create a reference for future analysis on new configurations of truss-core, in the present study the experimental modal analysis on sandwich panels with honeycomb and foam cores is carried out in the low-mid frequency range. The results obtained from modal analysis are used to estimate the acoustic power radiated by both panels. The panels’ faces are in carbon/epoxy so that all the attention is concentrated on the cores which represent the variables to be investigated. This activity has been developed inside the framework offered by the
SUPERPANELS project (www.superpanels.unina.it).
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Papers by Vincenzo D'Alessandro
SUPERPANELS project (www.superpanels.unina.it).
SUPERPANELS project (www.superpanels.unina.it).