Acoustics - Active acoustic panels

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In this case we use the resonating characteristics of cavities. On the walls we'd set up some cavities that have a specific resonance frequency. When this frequency is excited, the cavity resonates, absorbing part of that frequency's energy. These cavities are called Helmotz resonators and are mainly used to attenuate low frequencies. The portion of energy that doesn't get absorbed by the resonator is re-radiated hemispherically towards the inside, which is an advantage because this way the sound gets diffused in all directions. Another kind of absorber is the so called bass trap whose scheme is illustrated in the following diagram:

Environmental acoustics - Bass trap acoustic absorber

Bass trap acoustic absorber

The cavity's depth is λ/4 and its opening is covered in porous material. It is used for absorbing frequencies ranging from 30 - 150 Hz.

The last absorption panel we will mention is the so-called diaphragm absorber. It consists in a diaphragm that resonates at certain specific frequencies, detracting energy from the environment's resonance frequency.








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