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There are two methods to
measure the absorption coefficient of sound absorbing material,
one is the reverberation chamber method, a method of standing
wave tube. The sound absorption coefficient measurement method
of reverberation chamber random incidence, namely voice from the
sound absorbing material when the energy loss from all sides
into proportion, and the method of measuring the sound
absorption coefficient of the standing wave tube at normal
incidence, the sound incident angle is only 90 degrees. The
absorption coefficient of two measuring methods are different,
the most commonly used in engineering is the absorption
coefficient of the reverberation chamber method of measurement,
because the sound application in building incident is random. In
some measurement report will appear in the absorption
coefficient is greater than 1, this is due to the laboratory
measurement conditions, the theory of acoustic energy does not
absorb any sound-absorbing material may be greater than the
incident energy, the absorption coefficient is always less than
1. No more than 1 lines of numerical calculation in the actual
measurement of sound absorption in acoustic engineering can use
by more than 1, most were calculated by 1.
In the room, the sound will soon be full of every corner, so the
sound-absorbing materials are placed in the room any surface
acoustic effect. The greater the absorption coefficient of
sound-absorbing materials, sound-absorbing area more
sound-absorbing effect is more obvious. You can use
sound-absorbing ceiling, wall panels, sound absorption, sound
absorption and noise reduction of low frequency trap.
.