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Design of Acoustic Metamaterials for Passive Hearing Protector

Award Information

Department of Defense
Award ID:
Program Year/Program:
2011 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
701 McMillian Way, NW Ste D HUNTSVILLE, AL 35806-2922
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Woman-Owned: Yes
Minority-Owned: Yes
HUBZone-Owned: No
Phase 1
Fiscal Year: 2011
Title: Design of Acoustic Metamaterials for Passive Hearing Protector
Agency: DOD
Contract: D11PC20099
Award Amount: $98,908.00


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.

Principal Investigator:

Debbie Reeves
Senior Engineer
(256) 726-4994

Business Contact:

Deb Phipps
Sr. Contract Specialist
(256) 726-4884
Small Business Information at Submission:

CFD Research Corporation
215 Wynn Dr., 5th Floor Huntsville, AL -

EIN/Tax ID: 630944385
Number of Employees:
Woman-Owned: Yes
Minority-Owned: No
HUBZone-Owned: No