Abstract
Finless porpoises have evolved to equip a unique sound reception system composed of acoustic structures with gradient sound speed and density to achieve sound reception. Through numerical simulations and experiments, we demonstrated that this reception feat can be accomplished through physical implementation. Using the effective medium theory, we built respective composites to form an artificial bioinspired receptor to mimic the sound reception system of porpoise. This paper introduces an alternate aspect to bridge the gap between natural biosonar and artificial construction, shedding lights on inspiring additional advanced sound reception designs and systems.
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