Aerodynamic/Structural Mistuning Technologies for Assessing IBR/Blisk Repairs

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$749,993.00
Award Year:
2008
Program:
STTR
Phase:
Phase II
Contract:
N68335-08-C-0027
Award Id:
78148
Agency Tracking Number:
N064-015-0018
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
6688 Kinsman Road, Pittsburgh, PA, 15217
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
170204825
Principal Investigator:
Jerry Griffin
Vice President for Engineering
(412) 398-2914
JerryHGriffin@BladeDiagnostics.com
Business Contact:
Linda Griffin
CEO
(412) 398-0643
LindaNGriffin@BladeDiagnostics.com
Research Institute:
DUKE UNIV.
Phillip Grosshans
326 North Building
Durham, NC, 27708
(919) 681-5132
Nonprofit college or university
Abstract
Blade-to-blade variations in frequencies lead to the phenomenon of mistuning. Even very small amounts of mistuning can cause some blades to vibrate much more than others. Mistuning can cause an amplification of resonant response by up to 400 percent, and has been identified as a primary factor in HCF failures. One issue in setting blend limits is whether or not the blending operation will exacerbate mistuning so that the Blisk will have significantly higher vibratory response and fail from HCF. It is proposed in this STTR that BDC's mistuning technology be extended to assess the effect of blending on structural mistuning. The inspection machine could be used during the repair process to determine if blending produces mistuning that significantly increases the risk of failure from high vibratory response. Also, BDC will develop new technologies to assess how blending affects aerodynamic mistuning and to integrate these technologies with BDC's Mistuning Inspection Machine. These new technologies will be developed using the combined strengths of Blade Diagnostics Corporation and Duke University. The technology is also applicable to other Blisk repair techniques that may result in non-standard blade geometries. Also, the latest models of commercial aircraft engines are also using IBRs/Blisks.

* information listed above is at the time of submission.

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