Journal ArticleDOI
Helicopter Blade Response and Aeromechanical Stability with a Magnetorheological Fluid Based Lag Damper
TLDR
In this paper, the feasibility of using magnetorheological fluid-based dampers for lag damping augmentation in helicopters is explored and two different control schemes are presented-namely the On-Off scheme and the Feedback Linearization scheme.Abstract:
This paper explores the feasibility of using Magnetorheological (MR) fluid-based dampers for lag damping augmentation in helicopters. An 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 periodic damper loads in forward flight. It is shown that an 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 ajudicious choice of operation scheme.read more
Citations
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Journal ArticleDOI
Magnetorheological fluid devices: Principles, characteristics and applications in mechanical engineering
TL;DR: In this article, the modes of operation of MR fluid devices are analyzed and a comprehensive review is presented of the principles, characteristics and engineering applications of the MR fluids devices (especially dampers) studied in the last decade.
Journal ArticleDOI
A state of art on magneto-rheological materials and their potential applications:
TL;DR: A recent progressive review on magneto-rheological materials technology is presented in this paper, focusing on numerous application devices and systems utilizing magneto rheology materials, including fluids, foams, grease, elastomers, and plastomers.
Journal ArticleDOI
Hybrid magnetorheological fluid–elastomeric lag dampers for helicopter stability augmentation
Wei Hu,Norman M. Wereley +1 more
TL;DR: In this article, a hybrid magnetorheological fluid elastomeric (MRFE) damper is investigated for adjustable or programmable lag mode damping in helicopters, so that damping requirements can be varied as a function of different flight conditions.
Proceedings ArticleDOI
Semi-active vibration control with piezoelectric materials as variable-stiffness actuators
TL;DR: In this paper, a semi-active control law is used to switch the electrical shunt circuit of a piezoelectric actuator for energy dissipation in a simple mechanical system.
Journal ArticleDOI
Modelling and Dynamic Response of a Damper with Relief Valve
TL;DR: In this article, a simple algebraic model is derived which is developed into a more computationally complex model incorporating the dynamics of the internal spring valve and fluid compressibility, and numerical simulations indicate realistic dynamical phenomena and suggest key design parameters.
References
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Journal ArticleDOI
Phenomenological model for magnetorheological dampers
TL;DR: In this article, a model for controllable fluid dampers is proposed that can effectively portray the behavior of a typical magnetorheological (MR) damper and compared with experimental results for a prototype damper.
Phenomenological Model of a Magnetorheological Damper
TL;DR: In this article, a new model for controllable fluid dampers is proposed that can effectively portray the behavior of a typical magnetorheological damper and compared with experimental results for a prototype damper indicates that the model is accurate over a wide range of operating conditions.
Journal ArticleDOI
Commercial magneto-rheological fluid devices
TL;DR: Controllable magnetorheological (MR) fluid devices have reached the stage where they are in commercial production as discussed by the authors, and such devices are finding application in a variety of real world situations ranging...
Journal ArticleDOI
Seismic Response Reduction Using Magnetorheological Dampers
TL;DR: In this article, a clipped-optimal control strategy for controlling magnetorheological dampers to reduce structural responses due to seismic loads is presented, employing a newly developed model that accurately portrays the salient characteristics of the MR dampers.
Journal ArticleDOI
Structural Vibration Control Via Electrorheological-Fluid-Based Actuators With Adaptive Viscous And Frictional Damping
Kon-Well Wang,Y.S. Kim,D.B. Shea +2 more
TL;DR: In this article, a new control law is developed to maximize the damping effect of electrorheological dampers for structural vibration suppression under actuator constraints and viscous-frictional-combined damping.
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