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Proceedings Paper

Improvement of aeroelastic stability of hingeless helicopter rotor blade by passive piezoelectric damping
Author(s): Seung Jo Kim; Changheon Han; Chul Yong Yun
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Paper Abstract

To augment weakly damped lag mode stability of a hingeless helicopter rotor blade in hover, piezoelectric shunt with a resistor and an inductor circuits for passive damping has been studied. A shunted piezoceramics bonded to a flexure of rotor blade converts mechanical strain energy to electrical charge energy which is dissipated through the resistor in the R-L series shunt circuit. Because the fundamental lag mode frequency of a soft-in-plane hingeless helicopter rotor blade is generally about 0.7/rev, the design frequency of the blade system with flexure sets to be so. Experimentally, the measured lag mode frequency is 0.7227/rev under the short circuit condition. Therefore the suppression mode of this passive damping vibration absorber is adjusted to 0.7227/rev. As a result of damping enhancement using passive control, the passive damper which consists of a piezoelectric material and shunt circuits has a stabilizing effect on inherently weakly damped lag mode of the rotor blades, at the optimum tuning and resistor condition.

Paper Details

Date Published: 2 June 1999
PDF: 11 pages
Proc. SPIE 3672, Smart Structures and Materials 1999: Passive Damping and Isolation, (2 June 1999); doi: 10.1117/12.349776
Show Author Affiliations
Seung Jo Kim, Seoul National Univ. (South Korea)
Changheon Han, Seoul National Univ. (South Korea)
Chul Yong Yun, Seoul National Univ. (South Korea)

Published in SPIE Proceedings Vol. 3672:
Smart Structures and Materials 1999: Passive Damping and Isolation
T. Tupper Hyde, Editor(s)

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