An Electrorheologically Controlled Semi-Active Landing Gear

Lou, Zheng; Ervin, R D; Filisko, Frank E.; Winkler, C B

doi:10.4271/931403

Cited by 31 publications

(29 citation statements)

References 7 publications

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“…When compared to ER fluids, MR fluids have superior properties, including an order of magnitude higher yield stress, typically 50-100 kPa, and a much wider operational temperature range, typically -40 to 150 degrees C. High payoff may result by applying these materials in dampers for aerospace systems such as the lag mode damper for stability augmentation of helicopter rotor systems [2, 3], dampers for landing gear to enhance crashworthiness [4,5], and shock and vibration isolation mounts for avionics packages.…”

Section: Er Electrorheological Mr Magnetorheological Nbp Nonlinear Bimentioning

confidence: 99%

Analysis and testing of a linear stroke magnetorheological damper

Pang

Kamath

Wereley

1998

39th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference and Exhibit

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The hysteresis behavior of a linear stroke magnetorheological damper is characterized for sinusoidal displacement excitation at 2.0 Hz (nominal). First, we characterize the linearized MR damper behavior using equivalent viscous damping and complex stiffness. Four different nonlinear modeling perspectives are then discussed for purposes of system identification procedures, including: (1) nonlinear Bingham plastic model, (2) nonlinear biviscous model, (3) nonlinear hysteretic biviscous model, and (4) nonlinear viscoelastic-plastic model. The first three nonlinear models are piecewise continuous in velocity. The fourth model is piecewise smooth in velocity. By adding progressively more model parameters with which to better represent pre-yield damper behavior, the force vs. velocity hysteresis model is substantially improved. Of the three nonlinear piecewise continuous models, the nonlinear hysteretic biviscous model provides the best representation of force vs. velocity hysteresis. The nonlinear viscoelastic plastic model is superior for purposes of simulation to the hysteretic biviscous model because it is piecewise smooth in velocity, with a smooth transition from pre-yield to post-yield behaviors. The nonlinear models represent the force vs. displacement hysteresis behavior nearly equally well, although the nonlinear viscoelastic-plastic is quantifiably superior. Thus, any of the nonlinear damper models could be used equally successfully if only a prediction of energy dissipation or damping were of interest. Nomenclature ER Electrorheological MR Magnetorheological NBP Nonlinear Bingham-Plasticis primarily manifested as a substantial increase in the dynamic yield stress of the fluid, while the viscosity remains relatively constant [1]. When compared to ER fluids, MR fluids have superior properties, including an order of magnitude higher yield stress, typically 50-100 kPa, and a much wider operational temperature range, typically -40 to 150 degrees C. High payoff may result by applying these materials in dampers for aerospace systems such as the lag mode damper for stability augmentation of helicopter rotor systems [2, 3], dampers for landing gear to enhance crashworthiness [4,5], and shock and vibration isolation mounts for avionics packages.This article presents a systematic procedure with which to analyze the hysteresis behavior of MR dampers. Because the rheological behavior of ER fluids is qualitatively similar to that of MR fluids [6], these results can also be extended to ER dampers.

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Section: Er Electrorheological Mr Magnetorheological Nbp Nonlinear Bimentioning

confidence: 99%

Analysis and testing of a linear stroke magnetorheological damper

Pang

Kamath

Wereley

1998

39th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference and Exhibit

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“…Rheological fluids are commonly used in the field of vibration control, in automotive applications [17], [18], and the aerospace industry [19]- [23].…”

Section: A Magnetorheological Fluidsmentioning

confidence: 99%

Electromagnetic Modeling and Design of Haptic Interface Prototypes Based on Magnetorheological Fluids

et al. 2007

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We report on the design and implementation of innovative haptic interfaces based on magnetorheological fluids (MRFs). We developed 2-D and quasi-3-D MRF-based devices capable of suitably energizing fluids with a magnetic field in order to build shapes that can be directly felt and explored by hand. We obtained this effect by properly creating a distribution of a magnetic field over time and space inducing the fluid to assume a desired shape and compliance. We implemented different prototypes, synthesized and designed with the help of preliminary simulations by a 3-D finite-element code. In this way, both magnetic field and shear stress profiles inside the fluid could be carefully predicted. Finally, we evaluated and experimentally assessed the performance of these devices.

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“…Mikulowski et al [6] discuss the application of piezoactuators and magneto-rheological damper in the adaptive landing gear design. And there are some other researchers applying ER [7] or MR [8] technology in semi-active land gear system.…”

Section: Introductionmentioning

confidence: 99%

RBF-based backstepping control of semi-active landing gear system with solenoid valve actuator

Liu

2009

2009 IEEE International Conference on Intelligent Computing and Intelligent Systems

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In this paper, we present a RBF-based backstepping scheme for the semi-active control of landing gear system using high speed solenoid valve actuator. The full dynamics of a novel semi-active shock strut including solenoid valve are considered. The proposed nonlinear controller is based on a hierarchical structure which contains three loops. The outer loop computes the expected optimal strut force on both touchdown and taxiing situation. The middle loop realizes the tracking of optimal strut force via backstepping design method and uses a RBF network to approximate the unmodelled nonlinear dynamics. The inner loop is responsible for precise tracking of valve current. A rigorous proof of stability is given and simulations are conducted on both touchdown and taxiing conditions to verify performance of proposed controller.

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An Electrorheologically Controlled Semi-Active Landing Gear

Cited by 31 publications

References 7 publications

Analysis and testing of a linear stroke magnetorheological damper

Analysis and testing of a linear stroke magnetorheological damper

Electromagnetic Modeling and Design of Haptic Interface Prototypes Based on Magnetorheological Fluids

RBF-based backstepping control of semi-active landing gear system with solenoid valve actuator

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