Abstract

SOTOMAYOR CASTELLANOS, Javier Ramón  and  VILLASENOR AGUILAR, José María. Material properties and acoustic performance indexes of twenty-two Mexican woods. Measurement by ultrasound. Madera bosques [online]. 2018, vol.24, n.3, e2431132.  Epub Nov 01, 2018. ISSN 2448-7597.  https://doi.org/10.21829/myb.2018.2431132.

The goal of the research was to evaluate the material properties (apparent density, ultrasound speed, dynamic modulus and damping coefficient) and the indexes of the acoustic performance (acoustic radiation coefficient, acoustic impedance, efficiency acoustic coefficient, acoustic radiation coefficient, acoustic vibration index and anti-vibration acoustic index) of twenty-two Mexican woods with the purpose of evaluating its potential use in acoustic applications, such as the manufacturing of musical instruments in general, and string instruments, in particular. It was found that the material properties and the indexes of the acoustic performance of twenty-two woods studied are characteristics specific to each one of them. The speed of the ultrasound does not have a linear relationship with the apparent density of the wood. In contrast, the dynamic modulus is proportional to the apparent density. Low density woods have better acoustic efficiency coefficients compared to high density species. A selection criterion for a wood with aptitudes to be used in the manufacture of musical instruments is the combination of a low bulk density, a high dynamic modulus and a low damping coefficient.

Keywords : apparent density; damping coefficient; musical instruments; dynamic modulus; ultrasound speed.

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