Industries working in the automotive and building fields are interested in the prediction and the determination of the sound reduction index given by lightweight partitions. The investments in this research field are aiming to find experimental methods capable to assess the sound insulation performances of small specimens instead of full scale partitions. Using software packages based on FEM-BEM methods, some variables deriving from the manufacturing stage and influencing the sound transmission index are not taken into account. In the last decades a few methods based on the determination of the dynamic properties of sandwich beams have been developed and validated. The actual bending stiffness of the beam specimen can be determined on the basis of the least square method applied to a set of frequency dependent bending stiffness points determined for each natural frequency of a beam tested in free-free conditions. For this reason, it is of interest to examine the method used to perform a successful curve fitting. The aim of the present paper is to investigate possible alternative approaches to the solution of the computational problem.

Implementation of a numerical method for the best fitting of the bending stiffness curve to a set of experimental points

FORTINI, MASSIMO;
2016-01-01

Abstract

Industries working in the automotive and building fields are interested in the prediction and the determination of the sound reduction index given by lightweight partitions. The investments in this research field are aiming to find experimental methods capable to assess the sound insulation performances of small specimens instead of full scale partitions. Using software packages based on FEM-BEM methods, some variables deriving from the manufacturing stage and influencing the sound transmission index are not taken into account. In the last decades a few methods based on the determination of the dynamic properties of sandwich beams have been developed and validated. The actual bending stiffness of the beam specimen can be determined on the basis of the least square method applied to a set of frequency dependent bending stiffness points determined for each natural frequency of a beam tested in free-free conditions. For this reason, it is of interest to examine the method used to perform a successful curve fitting. The aim of the present paper is to investigate possible alternative approaches to the solution of the computational problem.
2016
Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future
978-3-939296-11-9
Bending stiffness; Least square method; Sound reduction index; Acoustics and Ultrasonics
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1016906
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