How to detect the sound absorption coefficient of acoustical materials

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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.






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Tags: acoustical materials