In a new study, theoretical physicists found that materials made from conical chains of spherical beads can help muffle sounds that lie in the upper range of human hearing or beyond.
The effect of these noises on health has not been determined. But some studies suggest that the consequences may include nausea, headaches, dizziness, hearing loss, or other symptoms.
The study used computer simulation – scientists wanted to understand how well various materials will absorb incoming sounds with a frequency of up to 20 kilohertz.
The best kit they found consisted of conical chains of beads made of tungsten carbide, alternating with conical chains of plastic. In computer simulation, this system effectively helped filter out high-frequency noises of various volumes, reducing these sounds.
“The advantage of our device is its simple configuration: spherical beads are correctly bounded and positioned,” the researchers noted. “This allows us to create a prototype of a lightweight construction with low cost and low maintenance”.