Sound Absorption Coefficient in Natural Flax Fibers

There are two methods of measuring the amounts of sound absorbed by various materials. One is the reverberation method, in which a specimen of the material to be tested is mounted on the walls of a reverberation chamber and the coefficient of absorption is deduced from the effect, which the presence of the specimen has on the rate of decay of sound in the chamber. The other consists in placing the specimen at the end of a Standing Wave Tube down which sound-waves are made to pass. The reflected and incident waves interfere, and the coefficient of absorption is calculated from observations made on the interference pattern within the impedance tube.

In this work the variables that affect the behaviour of the natural flax fiber is analyzed, when it is measured under different assembly conditions and methods