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Proceedings Paper

Hover testing of a Mach-scaled rotor with piezoelectric-bender-actuated trailing-edge flaps
Author(s): Nikhil A. Koratkar; Inderjit Chopra
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Paper Abstract

This paper presents the open-loop hover testing of a Mach- scaled (1/7-scale) rotor with piezoelectric bender actuated trailing-edge flaps. The flap motion generates new unsteady aerodynamic loads, which if correctly phased can be used to achieve active vibration suppression. The objective of the present tests is to demonstrate the open-loop control authority of the actuator-flap system. The model rotor was tested in hover condition on the University of Maryland rotor test rig. These tests were conducted using a Bell-412 Mach- scaled rotor hub. Trailing-edge flap deflections of ±5 to ±10 degrees were achieved in the 1 - 4/rev frequency range at 1800 RPM. The associated oscillatory rotor thrust per blade for 3/rev flap excitation was ±6.9 lbs (40% of steady rotor thrust per blade at 8 degrees collective). These results demonstrate the open-loop effectiveness of the actuator-flap system. Future work will include closed-loop control tests conducted in forward flight in the Glen L. Martin wind tunnel.

Paper Details

Date Published: 22 June 2000
PDF: 9 pages
Proc. SPIE 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems, (22 June 2000); doi: 10.1117/12.388807
Show Author Affiliations
Nikhil A. Koratkar, Univ. of Maryland/College Park (United States)
Inderjit Chopra, Univ. of Maryland/College Park (United States)

Published in SPIE Proceedings Vol. 3985:
Smart Structures and Materials 2000: Smart Structures and Integrated Systems
Norman M. Wereley, Editor(s)

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