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.
The key to understanding the reaction: the new configuration of the material, in periodically distributed panels, allows sound waves to easily enter the material and increases the interaction between it –the wave- and the structure, thereby increasing the absorption. As for its possible applications, it open a new way to design new noise reduction solutions such as the development of new baffles to reduce noise pollution caused by roads, railways, etc.
“Our study tackles one of the most important problems of society today from a new point of view: the design of materials and surfaces able to significantly reduce noise. In view of the results, we believe we have taken an important step toward the perfect absorber. And that has been done just by reconfiguring a known material,” says Víctor Sánchez-Morcillo, researcher at the Campus de Gandia of the Universitat Politècnica de València.
All the experimental development of this work has been done at the Campus de Gandia of the Universitat Politècnica de València, a center with a wide research and teaching experience related to acoustics.
Citation: J. Christensen, V. Romero-García, R. Picó, A. Cebrecos, F. J. García de Abajo, N. [parcial]Picó, A. Mortensen, M. Willatzen, Christensen, V. J. Sánchez-Morcillo, 'Extraordinary absorption of sound in porous lamella-crystals', Scientific Reports 4, doi:10.1038/srep04674
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- Part I: Bee Deaths Mystery Solved? Neonicotinoids (Neonics) May Actually Help Bee Health
- Education: Stop New Age Thinking, Chalk And Talk Might Be The Best Way After All
- Big Data Could Be A Big Problem For Workplace Discrimination Law
- Interstellar Is A Dangerous Fantasy Of US Colonialism
- Reasons Serious Scientist Should Not Fear The Winnower and other OA Open Review Journals.
- The BPA Paradox – Too Many Studies?
- 3X Saturated Fat In The Diet Doesn't Increase It In Blood
- "thanks to the information provided, it adds insight for us and add more extensive knowledge obat..."
- "thanks to the information provided, it adds insight for us and add more extensive knowledge http..."
- "Intriguing article. Science fiction at its best, but who knows what my grandchildren's grandchildren..."
- "I haven't seen the film yet, but I think this review is trying to make a big ol' mountain where..."
- "Are you a Neurologist? Why should anyone believe you? What are your credentials? I think it's pretty..."
- Adult survivors of childhood eye cancer experience few cognitive or social setbacks
- Healthy gut microbiota can prevent metabolic syndrome, researchers say
- Schizophrenia may be triggered by excess protein during brain development
- The sound of status: People know high-power voices when they hear them
- Mutant protein takes babies' breath away