Cone Of Silence: Creating A Perfect Acoustic Absorber
Researchers of the Universitat Politècnica de València at the Campus de Gandia have designed and experimentally evaluated a new structure that permit the complete absorption of sound at a wide range of frequencies.The best part is that they used conventional porous materials already common in the construction industry. No expensive metamaterials or mathematical wizardry.The researchers demonstrated how the structure achieves extraordinary sound absorption using what might seem like a contradictory strategy - the sound attenuation increases when the quantity of absorbent material is reduced, so a totally reflective surface becomes a perfect absorbent despite the fact that, for the most part, there is no material that absorbs sound. read more