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Proceedings Paper

Aeromechanical stability augmentation of helicopters using enhanced active constrained layer (EACL) treatment on flex beams
Author(s): Askari Badre-Alam; Kon-Well Wang; Farhan Gandhi
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Paper Abstract

This paper investigates the feasibility of employing Enhanced Active Constrained Layer (EACL) damping treatments on the flex beams of soft in plane bearingless main rotors (BMR) for lag mode damping and aeromechanical stability augmentation. A finite element based mathematical model of the EACL damping treatment of flex beam has been developed. The flex beam is modeled using beam-rod elements and the blade is modeled as a lumped inertia. A simple derivative controller based on the flexbeam tip transverse velocity is used in this investigation. A thorough parametric study is conducted to understand the influence of various design parameters such as viscoelastic layer thickness, PZT actuator thickness, and edge element stiffness, on actuator electrical field levels and axial stress induced in PZT actuator. The results of this study shows that the EACL treatments on the flex beams has good potential for rotor stability augmentation.

Paper Details

Date Published: 16 June 1998
PDF: 12 pages
Proc. SPIE 3327, Smart Structures and Materials 1998: Passive Damping and Isolation, (16 June 1998); doi: 10.1117/12.310714
Show Author Affiliations
Askari Badre-Alam, The Pennsylvania State Univ. (United States)
Kon-Well Wang, The Pennsylvania State Univ. (United States)
Farhan Gandhi, The Pennsylvania State Univ. (United States)

Published in SPIE Proceedings Vol. 3327:
Smart Structures and Materials 1998: Passive Damping and Isolation
L. Porter Davis, Editor(s)

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