Helicopter blade response and aeromechanical stability with a magnetorheological fluid-based lag damper

Sameer Marathe; Farhan Gandhi; Kon-Well Wang

doi:10.1117/12.316908

27 July 1998 Helicopter blade response and aeromechanical stability with a magnetorheological fluid-based lag damper

Sameer Marathe, Farhan Gandhi, Kon-Well Wang

Proceedings Volume 3329, Smart Structures and Materials 1998: Smart Structures and Integrated Systems; (1998) https://doi.org/10.1117/12.316908
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

Abstract

This paper explores the feasibility of using Magnetorheological (MR) fluid-based dampers for lag damping augmentation in helicopters. A MR damper model is integrated with a rotor aeromechanical model. Two different control schemes are presented--namely the On-Off scheme and the Feedback Linearization scheme. In the On-Off scheme, two criteria are used to obtain equivalent linear damping for the nonlinear MR damper as a function of the size of perturbation and the applied field. The Feedback Linearization scheme uses a feedback controller to linearize the force output of the MR damper. The two control schemes are compared for lag transient response in ground resonance and their ability to reduce damper load in forward flight. It is shown that a MR damper of a size comparable to an elastomeric damper can provide sufficient damping for ground resonance stabilization and can significantly reduce periodic damper loads with a judicious choice of operation scheme.

Citation Download Citation

Sameer Marathe, Farhan Gandhi, and Kon-Well Wang "Helicopter blade response and aeromechanical stability with a magnetorheological fluid-based lag damper", Proc. SPIE 3329, Smart Structures and Materials 1998: Smart Structures and Integrated Systems, (27 July 1998); https://doi.org/10.1117/12.316908

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