Novel Acoustic Materials for Passive Hearing Protection

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: D11PC20100
Agency Tracking Number: 10SB3-0087
Amount: $98,929.00
Phase: Phase I
Program: SBIR
Awards Year: 2011
Solicitation Year: 2010
Solicitation Topic Code: SB103-006
Solicitation Number: 2010.3
Small Business Information
5835 Schumann Dr., Fitchburg, WI, 53711-5176
DUNS: 831845826
HUBZone Owned: N
Woman Owned: Y
Socially and Economically Disadvantaged: N
Principal Investigator
 Yuri Shkel
 Managing Member
 (608) 277-9417
 yshkel@ieee.org
Business Contact
 Irina Shkel
Title: Chief Financial Officer
Phone: (608) 277-9417
Email: ishkel@charter.net
Research Institution
 Stub
Abstract
A bi-stable meta-material which rejects high amplitude harmful sound but transfers sound levels needed for the situation awareness is proposed. A threshold intensity of the sound is determined by the material design and is set to 90 dBA all signals exceeding this level will be attenuated at least at 25 dB. More specifically, the material is composed by meta-structural elements having two stable states: an element transmits a low intensity pressure wave by uniaxial elastic deformation. However, under the load exceeding the critical level, uniaxial deformations are replaced by bending deformations of the meta-structure. Since bi-stable elements are prone to mechanical instability and are switchable by the sound wave, they will perform best by having linear sizes much smaller than the wave length. In addition, the desired acoustic performance can be achieved within a few millimeters thick monolayer of the meta-elements. This is a critical advantage for designing wearable protective devices. Finally, the material can be mass fabricated using lithography free low cost manufacturing approaches.

* Information listed above is at the time of submission. *

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