Abstract
A commonly studied structure in active metamaterial research is an elastodynamic beam outfitted with piezoelectric patches with electronic circuitry used to modify the beam’s local material properties. These active beams have been used to validate a variety of conceptual strategies, including those to reduce vibrations, enhance flexural wave sensing, and break reciprocity. Here, we show how the coupling of adjacent piezoelectric patches can be used to create a nonlocal metamaterial featuring the highly nonreciprocal transmission of flexural waves. We discuss how a modified Bernoulli–Euler beam theory was used to design a controller to drive a piezoelectric patch using the signal from a spatially separate patch. We discuss conditions for stability and present experimental data validating model predictions.
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