Identification of Integrally Bladed Rotor (IBR) Damping

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-06-M-2639
Agency Tracking Number: F061-162-0756
Amount: $99,937.00
Phase: Phase I
Program: SBIR
Awards Year: 2006
Solicitation Year: 2006
Solicitation Topic Code: AF06-162
Solicitation Number: 2006.1
Small Business Information
6688 Kinsman Road, Pittsburgh, PA, 15217
DUNS: 170204825
HUBZone Owned: N
Woman Owned: Y
Socially and Economically Disadvantaged: N
Principal Investigator
 Drew Feiner
 Vice President,Technical Developme
 (412) 901-3467
Business Contact
 Linda Griffin
Title: President and CEO
Phone: (412) 398-0643
Research Institution
Due to funding and scheduling limitations, current testing for different IBR damping techniques and treatments has been forced to be accomplished simultaneously on a single IBR. Just like IBRs in service, the rotors are mistuned and the modal response is highly coupled. Mistuning refers to the fact that slight manufacturing differences cause each blade to have a different natural frequency – they are mistuned. Even very small amounts of mistuning can cause some blades to vibrate much more than others. Practically, every IBR is mistuned and even small amounts of mistuning can affect the frequency response of the IBR in a way that is currently indistinguishable from damping variations. Furthermore, different damping treatments change the frequencies of the blades as well as their damping. As a result, there are currently no accurate, reliable methods for extracting the individual damping contributions of each blade from the vibratory response of an IBR. The purpose of the work proposed here is to develop such methods.

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

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