News

Scientists Create Material That Blocks Sound, but Not Air or Light

Scientists Create Material That Blocks Sound, but Not Air or Light
Technology
By combining math with 3D printing, researchers from Boston University have created a new material that seemingly defies logic: light and air have no trouble passing through it — but sound cannot.

“The idea is that we can now mathematically design an object that can block the sounds of anything,” researcher Xin Zhang said in a press release  — meaning the future could be far quieter than the present.

In a paper published in the journal Physical Review B , the researchers describe the work that went into creating what they call their “ acoustic metamaterial .”

They started by calculating the dimensions and specification a material would need to have to be able to reflect incoming sound waves back to their source without blocking air or light. Then they 3D printed the material into a donut shape and attached it to one end of a PVC pipe, the other end of which they attached to a loudspeaker.

When they blasted a high-pitched note from the loudspeaker, they found that the shape blocked 94 percent of the sound coming through the pipe.

“The moment we first placed and removed the silencer…was literally night and day,” researcher Jacob Nikolajczyk said in the press release. “We had been seeing these sorts of results in our computer modeling for months — but it is one thing to see modeled sound pressure levels on a computer, and another to hear its impact yourself.”

The researchers envision many applications for their acoustic metamaterial, which they claim isn’t limited to the donut shape demonstrated by their research.

“Our structure is super lightweight, open, and beautiful,” Zhang and her fellow researcher Reza Ghaffarivardavagh said in the  press release . “Each piece could be used as a tile or brick to scale up and build a sound-canceling, permeable wall.”

They also note the potential to use the material to dampen the sound of drones, HVAC systems, or even MRI machines — seemingly anything that makes noise could make less noise with the addition of this new material.
Read more on futurism.com
News Topics :
Similar Articles :
Science
The mathematically designed, 3D printed acoustic metamaterial is shaped in such a way that it sends incoming sounds back to where they came from, Ghaffarivardavagh and Zhang say. Inside the outer...
Technology
Researchers at the Advanced Science Research Center ASRC at The Graduate Center of The City University of New York and at the City College of New York CCNY have developed...
Technology
This metamaterial surface has been engineered to perfectly and simultaneously control the transmission and reflection of incoming sound waves. Credit Junfei Li This metamaterial surface has been engineered to perfectly...
Technology
The creation pushes the boundaries of metamaterials a new class of finely engineered surfaces that perform nature defying tasks. These materials have already shown remarkable results with light manipulation, allowing scientists...
Technology
The researchers developed the first nonreciprocal mechanical materials using metamaterials, which are synthetic materials with properties that cannot be found in nature. Credit Cockrell School of Engineering The researchers developed...