Absorption Coefficient Of Hardwood

Sound absorption properties of wood have a close relationship with their micropores structure and gas permeability.
Absorption coefficient of hardwood. Hardwood burning was identified as the dominant source of carbonaceous aerosols. Absorption coefficients are an average of how absorptive each product is at numerous frequencies generally at 500 hz 1000 hz and 2000 hz. Sound absorption coefficient greater than 1 01 sound absorption coefficient greater than 1 02. Generally speaking soft porous materials will be more absorptive than hard reflective surfaces.
The length and pattern of the slots cut through the panels influence their absorption of soundwaves. In general when sound waves strike on the surface of porous materials sound energy could get channelized as. For hackberry hardwood species the better sound absorption coefficient is identified in a wide frequency range of 2 khz 6 khz due to the presence of more pores and larger passageway. Plywood hardwood panels over 25mm airspace on solid backing 0 30 0 20 0 15 0 10 0 10 0 05 solid backing with absorbent material in air space 0 40 0 25 0 15 0 10 0 10 0 05.
The measured aerosol absorption ångström exponent aae at 370 880 nm aae 370 880nm was 1 71 0 24.