Design of Acoustic Metamaterials for Passive Hearing Protector

Award Information
Agency:
Department of Defense
Branch
n/a
Amount:
$98,908.00
Award Year:
2011
Program:
SBIR
Phase:
Phase I
Contract:
D11PC20099
Award Id:
n/a
Agency Tracking Number:
10SB3-0086
Solicitation Year:
2010
Solicitation Topic Code:
SB103-006
Solicitation Number:
2010.3
Small Business Information
215 Wynn Dr., 5th Floor, Huntsville, AL, -
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
Y
Duns:
185169620
Principal Investigator:
Debbie Reeves
Senior Engineer
(256) 726-4994
tsb@cfdrc.com
Business Contact:
Deb Phipps
Sr. Contract Specialist
(256) 726-4884
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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