Aerodynamic/Structural Mistuning Technologies for Assessing IBR/Blisk Repairs

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-08-C-0027
Agency Tracking Number: N064-015-0018
Amount: $749,993.00
Phase: Phase II
Program: STTR
Awards Year: 2008
Solicitation Year: 2006
Solicitation Topic Code: N06-T015
Solicitation Number: N/A
Small Business Information
6688 Kinsman Road, Pittsburgh, PA, 15217
DUNS: 170204825
HUBZone Owned: N
Woman Owned: Y
Socially and Economically Disadvantaged: N
Principal Investigator
 Jerry Griffin
 Vice President for Engineering
 (412) 398-2914
Business Contact
 Linda Griffin
Title: CEO
Phone: (412) 398-0643
Research Institution
 Phillip Grosshans
 326 North Building
Durham, NC, 27708
 (919) 681-5132
 Nonprofit college or university
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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