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| Operational Deflection Shape of a Blade Based on Scanning Laser Doppler Velocimeter |
| Received:June 25, 2018 Revised:September 25, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.09.014 |
| KeyWord:laser velocimeter operational deflection shape modal natural frequency vibration mode |
| Author | Institution |
| HANG Chao |
Engine Integrity & Strength Department, AVIC Aircraft Strength Research Institute, Xi'an , China |
| YAN Qun |
Engine Integrity & Strength Department, AVIC Aircraft Strength Research Institute, Xi'an , China |
| HUANG Wen-chao |
Engine Integrity & Strength Department, AVIC Aircraft Strength Research Institute, Xi'an , China |
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| Abstract: |
| Objective To keep integrity of the blade. Methods The theory of structural operational deflection shape was applied. The operational deflection shape test system of aeroengine blade was established with a scanning laser Doppler velocimeter which has advantages of measurement multi-points, non-contact and high precision. A fast sine sweep base excitation was applied to the blade by a vibration table. The velocity response of 55 points on the blade was measured with the laser velocimeter. The front six natural frequencies and vibration modes of the blade were obtained through the operational deflection shape analysis method. The correlation between the above 6 modes of vibration was s evaluated according to the modal assurance criteria (MAC). Results The front six modes are first bending, two kinds of first twist, second bending, second twist and bending-twist coupling. The MAC of different modes was all smaller or equal to 0.2. Conclusion The correlation of different mode shapes is very small. The result correctness of operational deflection shape analysis is validated. |
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