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In this work we study the acoustic performance of a new absorbing material composed of waste of sugarcane. This performance is evaluated by the acoustic absorption coefficient. Delany-Bazley, Lafarge-Allard and Johnson-Allard models are used to estimate the absorption coefficient of the studied absorbent. Physical parameters such as flow resistivity, porosity, tortuosity, and characteristic lengths are measured thanks to direct and inverse methods to operate the used models. Indeed, we found that the absorption coefficient is strongly affected by these physical parameters. The choice of the adequate model is made by comparing the measured values of the absorption coefficient with its predicted values by different models. We have also investigated the effect of physical parameters variation on the absorption coefficient. The obtained results proved the good absorbing propriety of the studied material as well as the good agreement between the measured values of the absorption coefficient and predicted ones by the model of Johnson-Allard. [ABSTRACT FROM AUTHOR]

Agricultural residues present a challenge to the environment. Most of these residues are burnt in the farm causing several pollution hazards to the environment. There has been a lot of interest to find applications for these residues instead of burning them. One application can be using them as acoustic materials. This paper presents the results of the evaluation of the acoustic performance of the sugarcane wastes based material. This evaluation is made by measuring two acoustic parameters: the flow resistivity and the acoustic absorption coefficient. The manufacturing of multiple samples with different physical properties (sample thickness, fiber size, and resin content) allowed evaluating the effect of each property on the acoustical performance of the studied material. A comparison between experimental and theoretical results showed good agreement. [ABSTRACT FROM AUTHOR]