Abstract
Giant reeds represent a natural fiber widely available in some areas of the world. Its use can be particularly useful as the uncontrolled growth of giant reeds can be a problem because large areas are invaded by them and the crops are damaged. In this study, two models of numerical simulation of the acoustic behavior of giant reeds were put in comparison: the Hamet model and a model based on artificial neural networks. First, the characteristics of the reeds were examined and the procedures for the preparation of the samples to be analyzed were described. Then air flow resistance, porosity and sound absorption coefficient were measured and analyzed in detail. Finally, the results of the numerical modeling of the acoustic coefficient were compared. The neural network-based model showed high Pearson correlation coefficient value, indicating a large number of correct predictions.
Highlights
Experimental characterization and theoretical modeling of materials assumes a growing importance for the verification of their performance and for the ever-greater diffusion of simulation systems and analytical forecasting methods for the design of complex systems that include these materials
The models available in the literature and a new methodology based on artificial neural networks were examined
A detailed description of the procedure for measuring the acoustic properties of the material was reported, and the results were analyzed in detail
Summary
Experimental characterization and theoretical modeling of materials assumes a growing importance for the verification of their performance and for the ever-greater diffusion of simulation systems and analytical forecasting methods for the design of complex systems that include these materials. The behavior of a material can be modeled using different physical, mechanical, and acoustic parameters that summarize its properties to improve the vibro-acoustic performance of the systems analyzed [1,2,3]. Sound absorbing materials have a dual function. They are used in acoustic insulation, that is, to attenuate the sound pressure level in noisy environments. They are used for acoustic correction, that is, to control the reflections and the reverberation of the rooms. Many efforts are made to design and produce new materials obtained from different industrial recycling methods, or from vegetable or natural fibers [4,5,6]
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