# Use of single crystal and soft piezoceramics for alleviation of flow separation induced vibration in a smart helicopter rotor

Thakkar, Dipali and Ganguli, Ranjan (2006) Use of single crystal and soft piezoceramics for alleviation of flow separation induced vibration in a smart helicopter rotor. In: Smart Materials and Structure, 15 (2). 331-341.

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## Abstract

Dynamic stall and flow separation induced vibration alleviation is investigated using single crystal and soft piezoceramic-induced shear actuation. PZT-5H performs well to reduce vibration at cruise speed (about 50%) but fails to achieve a substantial vibration reduction (about 20%) at high speed forward flight because dynamic stall and flow separation require a larger stroke for vibration reduction. $PZN-8\%PT{\langle}111{\rangle}$-induced shear actuation is found to generate a larger stroke and eventually a higher vibration reduction (about 60–70%) at both cruise and high speed flight. It is observed that the controller performs satisfactorily up to a noise level of 20% in the sensed data. Optimum placement of actuators along the span, as well as the eventualities of actuator failure and degradation are also addressed.

Item Type: Journal Article Copyright of this article belongs to Institute of Physics. Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering) 17 May 2006 19 Sep 2010 04:26 http://eprints.iisc.ernet.in/id/eprint/6708