Elastic Metasurfaces for Full Wavefront Control and Low-Frequency Energy Harvesting
نویسندگان
چکیده
Abstract Controlling and manipulating elastic/acoustic waves via artificially structured metamaterials, phononic crystals, metasurfaces have gained an increasing research interest in the last decades. Unlike others, a metasurface is single layer host medium with array of subwavelength-scaled patterns introducing abrupt phase shift wave propagation path. In this study, elastic composed slender beam resonators proposed to control wavefront low-frequency flexural waves. The gradient based on Snell’s law achieved by tailoring thickness thin connecting two media. Through analytical numerical models, phase-modulated are designed verified accomplish three dynamic functions, namely, deflection, non-paraxial propagation, focusing. An oblique incident also demonstrated show versatility design for focusing energy from multiple directions. Experimentally measured has nearly times amplification at focal point which validates theoretical models. Furthermore, exploited harvesting piezoelectric harvester improved almost nine terms harvested power output as compared baseline pure plate without metasurface.
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ژورنال
عنوان ژورنال: Journal of Vibration and Acoustics
سال: 2021
ISSN: ['1048-9002', '1528-8927']
DOI: https://doi.org/10.1115/1.4050275