Sound Absorption by Tree Bark

Mengmeng Li, Timothy Van Renterghem, Jian Kang, Dick Botteldooren
2019 Proceedings of the ICA congress  
Scattering of sound waves by trunks is part of the noise reducing potential of tree belts, and it has been shown before that the absorbing properties of the trunks are relevant in this respect. Detailed information on bark absorption is currently very limited. Therefore, laboratory experiments were conducted with an impedance tube to measure the bark sound absorption of various species, including variations in bark thickness, tree age, density, and trunk diameter. Preliminary measurements were
more » ... ade to define the relevant part of the trunk for its acoustic absorption and to come to a reproducible sample handling procedure. The measurements show that the absorption (at normal incidence) is generally below 0.1 for the deciduous species considered, and that there is a small variation in between them.
doi:10.18154/rwth-conv-239236 fatcat:7jcdghdn2be4dcyu4k5tjnmiui