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Abstract
Noise control devices such as panels and barriers, when of high efficiency, generally are of difficult acquisition due to high costs turning in many cases their use impracticable, mainly for limited budget small-sized companies. There is a huge requirement for new acoustic materials that have satisfactory performance, not only under acoustic aspect but also other relevant ones and are of low cost. Vegetable fibers are an alternative solution when used as panels since they promise satisfactory acoustic absorption, according to previous researches, exist in abundance, and derive from renewable sources. This paper, therefore, reports on the development of panels made from vegetable fibers (coconut, palm, sisal, and açaí), assesses their applicability by various experimental (flammability, odor, fungal growth, and ageing) tests, and characterize them acoustically in terms of their sound absorption coefficients on a scale model reverberant chamber. Acoustic results point out that the aforementioned fiber panels play pretty well the role of a noise control device since they have compatible, and in some cases, higher performance when compared to commercially available conventional materials.
Highlights
Most of the products used in acoustical devices and treatments use nonrenewable source materials
Vegetable fibers are intrinsically flammable, so it is important that they can resist to the fire spreading or fungus proliferation when used as panels for the noise control purpose in environment indoors
This paper reports on development of newly manufactured panels using different vegetable fibers, namely, coconut, palm, sisal, and acaı fibers, and on their applicability for noise control purpose
Summary
Most of the products used in acoustical devices and treatments use nonrenewable source materials. Vegetable fibers are intrinsically flammable, so it is important that they can resist to the fire spreading or fungus proliferation when used as panels for the noise control purpose in environment indoors. Regarding those panels, the requested procedures and infrastructure to determine important properties (such as flow resistivity and tortuosity) to their acoustic characterization have been developed [5], and further have been applied in other similar researches [2, 6, 7]. It is important to mention that all the acoustic measurements mentioned here have been carried out on a scale model reverberant chamber, the same used in [2, 3] (see Figure 1(c))
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