Active Control of Rotor-Lock Noise in Turbofan Engines

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$69,896.00
Award Year:
2002
Program:
SBIR
Phase:
Phase I
Contract:
NAS3-02008
Agency Tracking Number:
012575
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Hersh Acoustical Engineering, Inc.
780 Lakefield Road, Unit G, Westlake Village, CA, 91361
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Bruce Walker
Principal Investigator
(805) 373-8533
haebew@iswest.com
Business Contact:
Alan Hersh
Vice President
(805) 373-8533
haeash@iswest.com
Research Institution:
n/a
Abstract
The proposed innovation is the design of an active control system to reduce aircraft turbofan engine rotor-lock inlet noise generated when rotor tip speeds become transonic. The system design for this program would be tailored to the requirements of the NASA GRC 22-inch diameter Source Diagnostic Fan. The proposed Phase I research program consists of (1) a conceptual design of a prototype active control sound source and (2) a MatLab based design of an active control system. The concept is an innovation because it uses an active/passive segmented liner noise cancellation concept, developed at Hersh Acoustical Engineering, Inc. (HAE) to cancel rotor-lock noise. A successful Phase I research program will establish the feasibility of developing an active control system capable of efficiently suppressing rotor-lock noise.

* information listed above is at the time of submission.

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