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http://dx.doi.org/10.5139/IJASS.2005.6.1.017

Vibration Measurement and Flutter Suppression Using Patch-type EFPI Sensor System  

Kim, Do-Hyung (Rotorcraft Department Korea Aerospace Research Institute)
Han, Jae-Hung (Division of Aerospace Engineering Korea Advanced Institute of Science and Technology)
Lee, In (Division of Aerospace Engineering Korea Advanced Institute of Science and Technology)
Publication Information
International Journal of Aeronautical and Space Sciences / v.6, no.1, 2005 , pp. 17-26 More about this Journal
Abstract
An optical phase tracking technique for an extrinsic Fabry-Perot interferometer (EFPI) is proposed in order to overcome interferometric non-linearity. Basic idea is utilizing strain-rate information, which cannot be easily obtained from an EFPI sensor itself. The proposed phase tracking system consists of a patch-type EFPI sensor and a simple on-line phase tracking logic. The patch-type EFPI sensor comprises an EFPI and a piezoelectric patch. An EFPI sensor itself has non-linear behavior due to the interferometric characteristics, and a piezoelectric material has hysteresis. However, the composed patch-type EFPI sensor system overcomes the problems that can arise when they are used individually. The dynamic characteristics of the proposed phase tracking system were investigated, and then the patch-type EFPI sensor system was applied to the active suppression of flutter, dynamic aeroelastic instability, of a swept-back composite plate structure. The proposed system has effectively reduced the amplitude of the flutter mode, and increased flutter speed.
Keywords
extrinsic Fabry-Perot interferometer; PZT; patch; flutter; control;
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