Switchgrass-based noise absorbing material: Characterization and modeling
Keywords:Acoustic wave absorption, Absorbing materials, Adjacent layers, Experimental data, Geometrical parameters, Optimal thickness, Reliable models, Sound absorbing panels, Sound absorption coefficients, Space between, Switchgrass
AbstractSwitchgrass is a tall grass plant largely present in North America and especially in Canada. It grows from rhizomes and is characterized by stems that can reach, like bamboo or sugarcane, up to 2 meters high. Moreover, its roots can be as deep as 2 meters. It is important to mention that during the measurement, samples were not compressed. The only pressure to which they were subjected were their own weight. This model takes into account geometrical parameters of spheres, the porosity and the space between two adjacent layers of spheres. This approach can be applied as far as one can approximate the shape of switchgrass stems by a sphere. Two models were used to simulate the sound absorption coefficient and compared to experimental data. The Johnson Champoux Alard model was shown to be the most reliable model which allows the assumption that it can be used to find the optimal thickness for the design of switchgrass-based sound absorbing panels.
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