A real labyrinth capable of trapping sound waves is hidden inside the new anti-noise panels designed by six students of the Alta Scuola Politecnica (ASP), the international program reserved for the best students of the Politecnico di Milano and the Polytechnic of Turin. The technology, achievable at low cost thanks to 3D printing, can be applied in various sectors, from construction to automotive and aeronautics.
The panels are made with innovative materials (metamaterials) that exceed the potential of conventional ones. Their performance is due to the geometry of the labyrinthine structures present inside, on which the acoustic wave is reflected several times, slowly reducing until it is self-canceling. These structures are able to dampen various types of noise: from medium frequency sounds, typical of speech and some musical instruments, to low frequency ones, caused by motors.
The labyrinthine metamaterials have a high potential, as their light structure, not bulky and 100% manufactured through 3D printing, makes it possible to build acoustic products with waste plastics, managing to reduce final costs. A possible sector of use could be that of aeronautics: the application of the panel in the fuselage of an aircraft would allow to isolate passengers from external noise and reduce the environmental noise pollution caused by the aircraft.
The project was tested and validated at the Energy-DENERG ‘Galileo Ferraris’ Department of the Politecnico di Torino. He was also involved as an industrial partner Phononic Vibes, a company founded in 2018 as a spin-off of the Politecnico di Milano. The project will continue as part of the European research path FET – Boheme, coordinated by the University of Trento and in which the Polytechnic of Turin, the Imperial College of London and the Federal Polytechnic of Zurich (ETH) are involved among others. .
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Source From: Ansa
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