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Magnetorheological landing gear: 2. Validation using experimental data

Batterbee, D.C., Sims, N.D., Stanway, R. and Rennison, M. (2007) Magnetorheological landing gear: 2. Validation using experimental data. Smart Materials and Structures, 16 (6). pp. 2441-2452. ISSN 0964-1726

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Abstract

Aircraft landing gears are subjected to a wide range of excitation conditions with conflicting damping requirements. A novel solution to this problem is to implement semi-active damping using magnetorheological (MR) fluids. In part 1 of this contribution, a methodology was developed that enables the geometry of a flow mode MR valve to be optimized within the constraints of an existing passive landing gear. The device was designed to be optimal in terms of its impact performance, which was demonstrated using numerical simulations of the complete landing gear system. To perform the simulations, assumptions were made regarding some of the parameters used in the MR shock strut model. In particular, the MR fluid's yield stress, viscosity, and bulk modulus properties were not known accurately. Therefore, the present contribution aims to validate these parameters experimentally, via the manufacture and testing of an MR shock strut. The gas exponent, which is used to model the shock strut's nonlinear stiffness, is also investigated. In general, it is shown that MR fluid property data at high shear rates are required in order to accurately predict performance prior to device manufacture. Furthermore, the study illustrates how fluid compressibility can have a significant influence on the device time constant, and hence on potential control strategies.

Item Type: Article
Copyright, Publisher and Additional Information: © 2007 IOP Publishing Ltd. This is an author produced version of a paper published in "Smart Materials and Structures". Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Magnetorheological, aircraft landing gear, semi-active damping, smart fluids, model validation
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield)
Depositing User: Dr Neil D Sims
Date Deposited: 21 Jul 2009 12:29
Last Modified: 08 Feb 2013 16:58
Published Version: http://dx.doi.org/10.1088/0964-1726/16/6/047
Status: Published
Publisher: Institute of Physics
Refereed: Yes
Identification Number: 10.1088/0964-1726/16/6/047
URI: http://eprints.whiterose.ac.uk/id/eprint/8861

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