(American Institute of Physics) Typically, when a soundwave strikes a surface, it reflects back at the same fundamental frequency with a different amplitude. A new model, reported in the Journal of Applied Physics, shows that when a sound wave hits a nonlinear elastic metasurface, the incident fundamental frequency does not bounce back. Instead, the metasurface converts that energy into the wave's second harmonic resonance. Developing this metasurface could help architects reduce noise from performance halls to cityscapes.
from EurekAlert! - Social and Behavioral Science https://ift.tt/2GrU5lk
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