กก
Sound is sound waves hit the
surface energy loss phenomenon, can reduce indoor acoustic sound
pressure level. Describe the sound-absorbing index is the
absorption coefficient a, representing ratio of acoustic energy
and material to absorb the energy of incident. In theory, if a
material fully reflected sound, then it's a=0; if a material
will absorb all incident acoustic energy, then it a=1. In fact,
all of the material a between 0 and 1, which is not all of the
reflection, it is not possible to absorb all.
At present the best sound-absorbing material belongs to the
polyester fiber sound-absorbing cotton we also called cotton
insulation, sound-absorbing cotton polyester fiber is
characteristic of sound absorption layer compression of a good
performance, but for polyester fiber sound-absorbing cotton
density on the absorption coefficient is directly related to the
general 30-35kg/ m3 as the best sound-absorbing effect.
.