Design of Acoustic Metamaterials for Passive Hearing Protector

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: D11PC20099
Agency Tracking Number: 10SB3-0086
Amount: $98,908.00
Phase: Phase I
Program: SBIR
Awards Year: 2011
Solitcitation Year: 2010
Solitcitation Topic Code: SB103-006
Solitcitation Number: 2010.3
Small Business Information
CFD Research Corporation
215 Wynn Dr., 5th Floor, Huntsville, AL, -
Duns: 185169620
Hubzone Owned: N
Woman Owned: Y
Socially and Economically Disadvantaged: N
Principal Investigator
 Debbie Reeves
 Senior Engineer
 (256) 726-4994
 tsb@cfdrc.com
Business Contact
 Deb Phipps
Title: Sr. Contract Specialist
Phone: (256) 726-4884
Email: dap@cfdrc.com
Research Institution
 Stub
Abstract
CFDRC proposes to develop new acoustic metamaterials, more specifically Locally Resonant Sonic Materials (LRSM), to be used in passive Hearing Protection Devices (HPD). LRSM derive their unique properties from resonators contained within each unit cell. Sound attenuation of finite size of LRSM is determined by the interaction of an incident elastic pulse with the resonators within the unit cells. The components that correspond to the resonance frequencies excite the resonators, taking its energy out of the propagating pulse. This trapped energy is then gradually passed to the surrounding material. The direction of the waves emitted by the resonant vibrations is in general different from the direction of the incident pulse, yielding a net attenuation of these frequency components. We can tune the band gaps of the LRSM response by varying the size and geometry of the structural unit. To accomplish the design objective, CFDRC proposes to use our existing software toolkit as a tool to design the optimum LRSM for HPD in Phase I. We will use existing modules as well as adding new modules to suit the needs for LRSM design. We plan to incorporate our existing auditory computational model to virtually test conceptual HPD designs using the LRSM.

* information listed above is at the time of submission.

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