![]() ![]() These functionalities encompass sound focusing, unconventional sound reflection, sound transmission manipulation, and more. “It can be broadened to achieve various functions similar to other metasurfaces. ![]() “The potential of this metasurface extends beyond sound insulation,” said Sabat. At the success of two coupled resonators, the researchers added more, until their device resembled a square sheet of punctured pingpong balls, multiplying the number of resonant frequencies that could be absorbed.īy adjusting the number of balls, number of holes, and hole size, the researchers could change the metasurface’s acoustic properties, proving it is possible to design a sound absorption panel without expensive materials. More resonant frequencies meant the device was able to absorb more sound. “The originality of the work was to consider the effect of the coupling between two resonators, leading to the occurrence of two resonance frequencies.” “The Helmholtz resonator has the unique ability to capture ambient sound waves precisely at its natural frequency and can be represented as cavities connected to their environment via a narrow neck,” Sabat said. This metasurface uses hollow pingpong balls with small holes punctured in each, modeling Helmholtz resonators. Pingpong balls therefore present an economical alternative to acoustic insulators for both low cost and potential recycling.”Īcoustic metasurfaces are materials specially engineered to manipulate sound waves. “Our motivation was to use these easily accessible objects to create a low-frequency insulating panel structure. Eat Sleep Table Tennis Repeat T-Shirt, Table Tennis Gift, Table Tennis Player Shirt, Playing Ping Pong Shirt, Gift For Her, Table Tennis Top (251) Sale Price 15.50 15. “Pingpong balls are well-known, everyday objects, present in large numbers all over the world,” said author Robine Sabat. In Journal of Applied Physics, from AIP Publishing, researchers from the University of Lille and the National Technical University of Athens describe an acoustic metasurface that uses pingpong balls as Helmholtz resonators to create inexpensive but effective low-frequency sound insulation. Because it is produced by a range of sources and is less affected by structures than higher-frequency sound, low-frequency noise can be challenging to avoid. Though potentially heard as background in the acoustic landscape, it can trigger earaches, respiratory impairment, irritability, and other long-term adverse effects. Low-frequency noise is ubiquitous in cities, near roads, and by airports. ![]() Conventionally thought of as the hollow plastic balls that speed through the air during a fast-tempo game of table tennis, with a few modifications, pingpong balls can help absorb the city din. 10, 2023 – Long-term exposure to low-frequency noise can cause numerous health problems, but the solution may be found in an unexpected object, a pingpong ball. Low-frequency noise is bad for health, but a pingpong ball acoustic metasurface can stop it.įrom the Journal: Journal of Applied Physics Experimental setup and numerical model of sound transmission through an acoustic metasurface based on pierced pingpong balls. ![]()
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