Aeromechanical stability augmentation of helicopters using enhanced active constrained layer (EACL) treatment on flex beams

Askari Badre-Alam; Kon-Well Wang; Farhan Gandhi

doi:10.1117/12.310714

16 June 1998 Aeromechanical stability augmentation of helicopters using enhanced active constrained layer (EACL) treatment on flex beams

Askari Badre-Alam, Kon-Well Wang, Farhan Gandhi

Author Affiliations +

Proceedings Volume 3327, Smart Structures and Materials 1998: Passive Damping and Isolation; (1998) https://doi.org/10.1117/12.310714
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

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.

Citation Download Citation

Askari Badre-Alam, Kon-Well Wang, and Farhan Gandhi "Aeromechanical stability augmentation of helicopters using enhanced active constrained layer (EACL) treatment on flex beams", Proc. SPIE 3327, Smart Structures and Materials 1998: Passive Damping and Isolation, (16 June 1998); https://doi.org/10.1117/12.310714

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