Acoustic response for nonlinear, coupled multiscale model containing subwavelength designed microstructure instabilities

Abstract

Non-periodic arrangements of inclusions with incremental linear negative stiffness embedded within a host material offer the ability to achieve unique and useful material properties on the macroscale. In an effort to study such types of inclusions, the present work develops a time-*

Sound diffusion with spatiotemporally modulated acoustic metasurfaces

“…While the presence of these harmonics can complicate the design of nonreciprocal devices 17 , the generation of additional frequencies and wavenumbers is highly useful if one wishes to efficiently diffuse acoustic energy in time and space. The idea of scattering energy into multiple frequencies and wavelengths via nonlinear interactions is a well-known approach to efficiently absorb acoustic 34 and vibrational energy 35 , but this concept has not been considered as a means to improve acoustic diffusion. Further, the use of spatiotemporal modulation to scatter energy into different frequencies does not require nonlinear behavior or high amplitude signals.…”