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- W2949150963 abstract "Acoustic nonreciprocity has been shown to enable a plethora of effects analogous to phenomena seen in quantum physics and electromagnetics, such as immunity from backscattering and unidirectional band gaps, which could lead to the design of direction-dependent acoustic devices. One way to break reciprocity is by spatiotemporally modulating material properties, which breaks parity and time-reversal symmetries. In this paper, we present a model for a medium in which a slow nonlinear deformation modulates the effective material properties for small overlaid disturbances (often referred to as ``small-on-large'' propagation). The medium is modeled as a discrete spring-mass chain that undergoes large deformation via prescribed displacements of certain points in the unit cell. A multiple-scale perturbation analysis shows that, for sufficiently slow modulations, the small-scale waves can be described by a linear monatomic chain with time- and space-dependent on-site stiffness. The modulation depth can be tuned by changing the geometric and stiffness parameters of the unit cell. The accuracy of the small-on-large approximation is demonstrated using direct numerical simulations." @default.
- W2949150963 created "2019-06-27" @default.
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- W2949150963 date "2019-01-14" @default.
- W2949150963 modified "2023-10-10" @default.
- W2949150963 title "Nonreciprocal wave phenomena in spring-mass chains with effective stiffness modulation induced by geometric nonlinearity" @default.
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- W2949150963 doi "https://doi.org/10.1103/physreve.99.013001" @default.
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