A Finite Element-Based Acoustic Engineering Design Program for Advancements in Passive Noise Reduction Performance of Helmet Mounted Noise Defenders

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-02-C-0439
Agency Tracking Number: N022-0520
Amount: $69,985.00
Phase: Phase I
Program: SBIR
Awards Year: 2002
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
1700 Kraft Drive, Suite 2350, Blacksburg, VA, 24060
DUNS: 364131011
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Michael Vaudrey
 Vice President
 (540) 951-1284
Business Contact
 Michael Vaudrey
Title: Vice President
Phone: (540) 951-1284
Email: mike@adaptivetechinc.com
Research Institution
"Adequate hearing protection for U.S. Navy crew personnel is mandatory and may be achieved through the use of earcups, earplugs, or both. Donning only the earcups or only the earplugs is referred to as single hearing protection (SHP), while the use ofearplugs under earcups is called double hearing protection (DHP). This Phase I program offers a comprehensive engineering study and design strategy that relies on Acoustic Finite Element Analyses (AFEA) and correlated test-based models to prioritize allspecific acoustic phenomena that affect SHP noise transmission to the ear across the entire audible frequency bandwidth. This prioritization of controlling noise mechanisms will then form a much-needed framework for exploitation of new design principlesin both SHP and DHP applications. The Phase I Option and Phase II will continue the evolution of the model to address further problems in the DHP application. Finally, comparisons between the DHP FEA results to measured DHP system performancemeasurements, will help to identify the absolute best possible noise attenuation that can be achieved in the occluded space, not accounting for bone conduction paths. The most significant benefit of the Phase I program will be the contribution of adetailed acoustic engineering study that prioritizes all noise propagation mechanisms participating in the noise attenuation/transmission paths created by helmet mounted hearing defenders. Commercially,

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

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