Cochlear outer hair cell bio-inspired metamaterial with negative effective parameters
Title of Paper:
Cochlear outer hair cell bio-inspired metamaterial with negative effective parameters
Summary:
Inspired by periodical outer hair cells (OHCs) and stereocilia clusters of mammalian cochlear, a type of bio-inspired metamaterial with negative effective parameters based on the OHC structure is proposed. With the structural parameters modified and some common engineering materials adopted, the bio-inspired structure design with length scales of millimeter and lightweight is presented, and then, a bending wave bandgap in a favorable low-frequency with width of 55 Hz during the interval 21–76 or 116 Hz during the interval 57–173 Hz is obtained, i.e., the excellent low-frequency acoustic performance turns up. Compared with the local resonance unit in previous literatures, both the size and weight are greatly reduced in our bio-inspired structure. In addition, the lower edge of low-frequency bandgap is reduced by an order of magnitude, almost to the lower limit frequency of the hearing threshold as well, which achieves an important breakthrough on the aspect of low-frequency and great significance on the noise and vibration reduction in lowfrequency range.
Co-author:
Fuyin Ma, Jiu Hui Wu, Meng Huang, and Siwen Zhang
Papers
