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perforated plate of mineral wool
sound-absorbing board absorption coefficient
The principle of material is wooden sound-absorbing panels:
Vibration and sound color sound-absorbing board source on the object, it
is caused by vibration in the air and the adjacent formation acoustic
wave, and in the air medium to spread around, when the incoming sound
component material surface, part of the sound energy is reflected
through a part of materials, as well as a component material in
vibration or sound due to the propagation and around medium by friction,
the sound energy into heat energy, sound energy loss, often said that
the sound is absorbed by the material.
Sound absorption coefficient
The sound absorption performance of the material is good or bad, with
the sound absorption coefficient. For the E /E0 absorption loss
coefficient, and penetration coefficient is E / E0 and penetration. The
sound absorption performance of the material is related to the
structure, thickness and the surface characteristics of the material,
but also with the incident direction and frequency of the sound.
Any sound-absorbing material can absorb the sound, but the extent of
absorption is very different. National regulations: sound absorption
coefficient of more than 0.2 of the material, as a sound absorption
material.
The sound-absorbing material is a professional R & D and production of
the acoustic material accounting strictly, such as groove wood panels,
fabric panels, leather panels, wood cement panels, polyester fiber
board, sound-absorbing cotton, beryllium beauty sound-absorbing panels,
the acoustic absorption mechanism is in-depth material pore, and pore
openings for the inner hole are communicated with each other by the air
molecules, friction and viscous resistance, and the fines for mechanical
vibration, so that the sound energy into heat. The sound absorption
coefficient of this kind of sound absorption material is gradually
increasing from low frequency to high frequency, so it is better to
absorb the high frequency and intermediate frequency.
Wooden sound-absorbing plate is what?
Generally, the larger the room volume, the longer reverberation time,
the worse the language definition, in order to ensure the clarity of the
language, the need to do sound absorption in the room, control
reverberation time. Such as the auditorium, the classroom, the stadium,
the cinema, KTV, the court, the subway station, the music room, the
opera house, the hotel, the conference room, the concert hall, the piano
room, the computer room, the factory workshop and so on.
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