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HCF and Mistuning Detection
Navy SBIR FY2011.2
| Sol No.: |
Navy SBIR FY2011.2 |
| Topic No.: |
N112-121 |
| Topic Title: |
HCF and Mistuning Detection |
| Proposal No.: |
N112-121-0210 |
| Firm: |
Prime Photonics, LC
1116 South Main Street
Suite 200
Blacksburg, Virginia 24060 |
| Contact: |
Dan Kominsky |
| Phone: |
(540) 961-2200 |
| Web Site: |
www.primephotonics.com |
| Abstract: |
During the course of operation the blades of a blisk are altered by erosion, fatigue, and FOD. In the case of more significant blade damage the blade may need to be blended to restore its strength. These changes can result in rotor mistuning, allowing for more damaging modes to be supported in the rotor, leading to high cycle fatigue and ultimately rotor failure.
Prime, with team partner Virginia Tech, will adapt the existing FOCIS technology platform to detect the vibrations of the rotor blades to prevent the onset of high cycle fatigue. This will be done by expanding the FOCIS probeA��,��,�s native ability to perform time of arrival measurements and instantaneous blade tip velocity measurements. In the proposed configuration, a multi-beam variant of the FOCIS probe will be developed allowing for simultaneous monitoring of a bladeA��,��,�s motion at multiple locations. By comparing the blade motions against a known good standard (e.g. a factory tuned rotor) the degree of mistuning can be assessed. Work on the project will include:
A��,�A� Refinement of the probe system to use additional beams
A��,�A� Theoretical analysis to determine the optimal placement of the beams
A��,�A� Experimental validation using the Virginia Tech blade vibration and flutter research rig
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| Benefits: |
By enabling the detection of mistuning and the onset of anomalous blade vibrations rotors can be removed from service prior to the failure that can result from high cycle fatigue (HCF). HCF is currently an issue which has no effective solution, and has resulted in the destruction of engines during operation. By detecting problematic blade motion prior to failure, end users will be able to avoid total loss of engines, as well as achieve ongoing savings though implementation of condition based maintenance methods. This technology is equally applicable to the commercial aviation market as well as the military one. Finally, by implementing it in conjunction with the other functions of the FOCIS probe, additional value can be obtained at minimal marginal cost. |
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