Design and characterization of cochlea-inspired tonotopic resonators

TL;DR

This paper introduces a cochlea-inspired spiral resonator that mimics the ear's frequency mapping, demonstrating its potential for signal discrimination and applications in testing and vibration control.

Contribution

A novel cochlea-inspired spiral design for tonotopic resonators, optimized and validated through simulations and experiments, enabling frequency-based signal analysis.

Findings

Resonator exhibits out-of-plane vibration modes with frequency-dependent spatial distribution.

Experimental validation confirms the numerical simulation results.

Potential applications include non-destructive testing and vibration attenuation.

Abstract

The cochlea has long been the subject of investigation in various research fields due to its intriguing spiral architecture and unique sensing characteristics. One of its most interesting features is the ability to sense acoustic waves at different spatial locations, based on their frequency content. In this work, we propose a novel design for a tonotopic resonator, based on a cochlea-inspired spiral. The resulting structure was subjected to an optimization process to exhibit out-of-plane vibration modes with mean out-of-plane displacement maxima distributed along its centerline spanning nearly a two-decade frequency range. Numerical simulations are performed to demonstrate the concept, which is also confirmed experimentally on a 3D printed structure. The obtained frequency-dependent distribution is shown to be a viable source of information for the discrimination of signals with various frequency components. The harnessed tonotopic features can be used as a fundamental principle to design structures with applications in areas such as non-destructive testing and vibration attenuation.