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Appl. Sci. 2018, 8(1), 45; doi:10.3390/app8010045

Application of the Wave Propagation Approach to Sandwich Structures: Vibro-Acoustic Properties of Aluminum Honeycomb Materials

1
Department of Mechanical and Industrial Engineering, University of Brescia, 25128 Brescia, Italy
2
Department of Aeronautical and Vehicle Engineering, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden
*
Author to whom correspondence should be addressed.
Received: 3 December 2017 / Revised: 16 December 2017 / Accepted: 16 December 2017 / Published: 1 January 2018
(This article belongs to the Section Acoustics)
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Abstract

Sandwich structures are manufactured using multiple combinations of materials for core and laminates. The real performances are influenced by variability in the composing layers and even by the uncertainties introduced while bonding them together. Therefore, experimental tests are usually the preferred way to assess the most important parameters required to develop and to characterize the product, the main downsides lying in their cost and time consumption. This work explores a practical application of the wave propagation approach by means of a case study, in which some significant properties of an aluminum honeycomb panel are obtained starting from simple vibro-acoustic tests carried out on beam specimens. After determining the frequency-dependent bending stiffness function, the sound transmission loss is predicted and compared with the experimental results obtained in sound transmission suites. The same vibro-acoustic tests are used to estimate the core shear modulus. Finally, a parametric study is proposed to show how this technique can be effectively used in the early design stage, when producing physical samples is often impossible due to time and money constraints. The method proved to be a reliable and powerful tool in all the tested applications, providing good results with limited computational effort. View Full-Text
Keywords: bending wave propagation; bending stiffness; sandwich panel; sound transmission loss bending wave propagation; bending stiffness; sandwich panel; sound transmission loss
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Piana, E.A.; Petrogalli, C.; Paderno, D.; Carlsson, U. Application of the Wave Propagation Approach to Sandwich Structures: Vibro-Acoustic Properties of Aluminum Honeycomb Materials. Appl. Sci. 2018, 8, 45.

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