Active Noise Reduction Technology

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N65538-05-M-0005
Agency Tracking Number: N043-222-0702
Amount: $69,732.00
Phase: Phase I
Program: SBIR
Awards Year: 2004
Solitcitation Year: 2004
Solitcitation Topic Code: N04-222
Solitcitation Number: 2004.3
Small Business Information
ETREMA PRODUCTS, INC.
2500 N. Loop Drive, Ames, IA, 50010
Duns: 798683355
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Rachel Dudley
 Senior Engineer
 (515) 296-8030
 rachel.dudley@etrema.com
Business Contact
 Jonathon Snodgrass
Title: Vice President and Chief Scientist
Phone: (515) 296-8030
Email: jon.snodgrass@etrema.com
Research Institution
N/A
Abstract
The proposed effort will actively reduce noise from flight operations at watchstander stations below the flight deck to levels that do not require hearing protection. Long-term hearing loss of personnel is projected to cost the Navy on the order of $12.6 billion over a 30 year retirement period. Active noise reduction (ANR) has long been known as the best method of controlling low-frequency noise but has been limited by available technologies. Recent developments in modern control methods and microprocessors have made active noise reduction a practical, realizable solution for controlling low-frequency noise. Etrema Products, Inc. proposes to implement an ANR system to reduce noise levels from shipboard flight operations by >20 dBA over the frequency range from 50-800 Hz. The proposed approach uses a combination of active structural acoustic control and active noise cancellation by vibrating ship bulkheads and/or speaker panels to actively control noise in ship compartments using the magnetostrictive material, TERFENOL-D. The Phase I effort will be to generate a design concept, demonstrate its feasibility through modeling, and develop a concept validation plan. If successful, the proposed work will reduce costs to the Navy of long-term hearing loss and other detrimental effects of excessive noise exposure.

* information listed above is at the time of submission.

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