Building on their breakthrough in 2019, the researchers reveal a new ultra-open metacaterous that make a wider spectrum of noise and the ventilation of the fan silence.
A new breakthrough from the Zhang laboratory from Boston University is waves in the world of sound control. Led by Professor Xin Zhang (Me, ECE, BME, MSE) The team has published a new paper in Scientific reports With the title “Ultra -open meta materials of the phase gradients for broadband acoustic mute switching. ““ The article is a great progress in its long-term acoustic meta material silencer project.
The Zhang laboratory is known in the areas of meta materials and microsystems for the continuous further development of real applications. As early as 2019, their research on an acoustic metacassic silencer – or the “Sound Shield” – for “significantly blocked, while the air flow based on Fano -Resonance effects was significantly blocked”. At that time, the applications focused on fans, propeller and HLK systems that aim to reduce narrow -band noise and equalSee 2019 edge Article for more on the original breakthrough).
Since then, the Zhang laboratory has expanded its work to examine a wider range of acoustic silent circuit strategies to investigate multi-gang, broadband and adjustable acceptance, which makes technology in new environments such as factories, offices and public spaces, in which diverse and unpredictable sound frequencies are common and the air flakes are still of crucial importance.
Your latest advance payment focuses on broadband stump circuit. While this wider control with a modest compromise in the maximum mute circuit performance-a frequent challenge when shifting narrowband to broadband suppression-powerful new opportunities relaxed. The breakthrough was made possible by the use of phase gradient metacin materials, which led to the phase gradient-ultra-open metasmaterial (pguom).
“Earlier designs based on Fano Resonance – Developed by our team – were like a radio to block a single station,” says Zhang. “PGUOM follows a more intelligent approach to a broadband of undesirable sounds with noise cantoners. Spread a wide range of frequencies. “
Further progress in the project has made it possible for the team to greater design flexibility and enable them to preserve the air flow and at the same time adapt the structure to real systems. Zhang explains that the meta material consists of individual or repeating super cells, each consisting of three cells of the lower wavelength. Fixed barriers are integrated into the cells of the first and third unit to induce controlled phase shifts in the incoming sound waves, while the center of the central unit remains open in order to enable an unabated air flow. These technical phase shifts create a complete 2π phase gradient via any super cell and convert incoming sound waves in periodician waves -acoustic counterparts in electromagnetic surface plasmons -caught and replaced along the surface.
The result: broadband sounds are oppressed efficiently, while the air flow and geometric adaptability are retained.
“Our design is not a large and that is a strength,” says Zhang. “Depending on the application, it can be adapted both in the frequency range and at air flow level.” In contrast to conventional phase gradient structures with uniform unit cells, its design enlarges the central cell to meet the different air -electricity claims without affecting the silent circuit performance.
The motivation behind the work is clear: “Chronic exposure to excessive noise – often overlooked compared to air and water pollution – can seriously influence human health and contribute to hearing loss, sleep disorders, increased stress level and even cardiovascular diseases,” says Zhang.
However, the influence does not stop in humans – wild animals, change in mating and hunting patterns and destabilizing ecosystems also interfere without pollution. In view of the latest design advances that focus on lighter, more open and broadband-capping materials, the team now increases these challenges in more comprehensive standards of the effects on the real world.
These breakthroughs are not only theoretical. The team has successfully switched from the simulation to physical prototypes and is now starting the future use.
“We concentrate on integrating our designs into certain products and applications and at the same time optimizing the meta materials for scalable manufacturing processes,” says Zhang. “We are also working on improving the performance of the noise blocking-a high level of weakening for even broader frequency straps, while we maintain a low air flow resistance and minimize the total thickness.”
Ultimately, the Zhang laboratory develops versatile, scalable solutions that can be used in industries to make the world a quieter, healthier place.
So Stay on it– Further innovations are on the way!
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