Phononic transistors and mechanical calculators

Abstract eng:
The realization of mechanical metamaterials analogous to electronics systems, like diodes, transistors and logic elements, opens new horizons towards the fabrication of advanced acoustic systems, smart actuators and adaptable vibration mitigating materials. Previous realizations of acoustic diodes and mechanical switches have employed nonlinearities to break transmission symmetry, but have not yet been able to demonstrate amplification or to execute complex logic operations. Our work harnesses the interaction between geometric nonlinearities and nonlinear magnetic potentials, to engineer frequency-agile band gaps in mechanical metamaterials. These gaps are utilized to demonstrate, both numerically and experimentally, the switching and amplification of a mechanical signal in a mechanical circuit board. The tunability of the proposed system in real-time enables the realization of the complete set of mechanical logic elements. We fabricate and test a mechanical metamaterial that utilizes interconnected phononic transistors to execute simple calculations.

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