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Definition of sound absorption

Sound absorption is defined as the effect of conversion from acoustic energy into thermal energy after the sound enters the porous materials or causes the plate to flexibly deform.

Sound wave causes vibration friction when it spreads in the air, which will be converted into heat energy, causing the sound wave to gradually attenuate with the increase of the propagation distance, which is called air absorption.

When sound wave is incident on the porous sound absorbing materials, a considerable part of the sound energy is converted into heat energy and absorbed due toviscous resistance of the air, the vibration of air and the wall of the hole, called material sound absorption.