Lightweight structures find more and more applications in both vehicle and building engineering. To meet a growing demand, a variety of different types of double and sandwich panels have been developed during the last few decades. One of the problems to deal with is be the assessment of the acoustic performances of such panels once they are already mounted in their final place. In this case, it can be of importance to find a way to characterise their dynamic and acoustic properties, such as bending stiffness, internal losses and sound transmission loss, through non destructive testing. In the following paper a method for a quick determination of the bending stiffness of a lightweight ribbed panel is presented. On the basis of the apparent bending stiffness and of the losses, it is possible to predict the transmission loss of the panel in a fairly simple way. The results obtained from the mobility tests have been compared to the measurements carried out in sound transmission rooms according to the ISO standard procedure. The model used for the post processing of the mobility data allows parameter studies of the sound transmission loss and of the sound radiation ratio for structures with different thicknesses of the laminates and the core once the main physical data are known.

Acoustic properties of composite lightweight structures

PIANA, Edoardo Alessio;
2020-01-01

Abstract

Lightweight structures find more and more applications in both vehicle and building engineering. To meet a growing demand, a variety of different types of double and sandwich panels have been developed during the last few decades. One of the problems to deal with is be the assessment of the acoustic performances of such panels once they are already mounted in their final place. In this case, it can be of importance to find a way to characterise their dynamic and acoustic properties, such as bending stiffness, internal losses and sound transmission loss, through non destructive testing. In the following paper a method for a quick determination of the bending stiffness of a lightweight ribbed panel is presented. On the basis of the apparent bending stiffness and of the losses, it is possible to predict the transmission loss of the panel in a fairly simple way. The results obtained from the mobility tests have been compared to the measurements carried out in sound transmission rooms according to the ISO standard procedure. The model used for the post processing of the mobility data allows parameter studies of the sound transmission loss and of the sound radiation ratio for structures with different thicknesses of the laminates and the core once the main physical data are known.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11379/478603
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