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Control laws for an active tunablevibration absorber designed for rotor blade dampingaugmentation

Published online by Cambridge University Press:  03 February 2016

F. Nitzsche,
D. G. Zimcik,
V. K. Wickramasinghe and
C. Yong
F. Nitzsche
Affiliation:
Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa, Canada
D. G. Zimcik
Affiliation:
Institute for Aerospace Research, National Research Council Canada, Ottawa, Canada
V. K. Wickramasinghe
Affiliation:
Institute for Aerospace Research, National Research Council Canada, Ottawa, Canada
C. Yong
Affiliation:
Institute for Aerospace Research, National Research Council Canada, Ottawa, Canada
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Abstract

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Most Individual Blade Control (IBC) approaches haveattempted to suppress the rotor vibration byactively altering the varying aerodynamic loads onthe blade using techniques such as trailing-edgeservoflaps or imbedded piezoelectric fibres to twistthe blade. Unfortunately, successful implementationof these approaches has been hindered byelectromechanical limitations of piezoelectricactuators. The Smart Spring is an unique approachthat is designed to suppress the rotor vibration byactively altering the structural stiffness of theblade out of phase with the time varying aerodynamicforces. The Smart Spring system is able toadaptively alter the stiffness properties of theblade while requiring only small deformations of theactuator, which overcomes the major problemsinherent in the former approaches. The theoreticalcharacterisation of the Smart Spring system as aclass of active Tunable Vibration Absorbers (TVA) ispresented in the paper. A real-time adaptive controlsystem was developed for a Smart Spring to suppressvibration. Initial aerodynamic wind tunnel testresults using the proof-of-concept model of thedevice in a fixed blade indicate that the SmartSpring can evolve into a powerful approach forIBC.

Information

Type
Research Article
Information
The Aeronautical Journal , Volume 108 , Issue 1079 , January 2004, pp. 35 - 42
Copyright
Copyright © Royal Aeronautical Society 2004 

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