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Proceedings Paper

Design and performance optimization of magneto-rheological oleopneumatic landing gear
Author(s): David C. Batterbee; Neil D. Sims; Roger Stanway; Zbigniew Wolejsza
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Paper Abstract

Magnetorheological (MR) fluids provide a novel solution to adapt damping levels in aircraft landing gear, so that optimal performance can be achieved over a wide range of conditions. The present study helps to demonstrate the feasibility of this solution by sizing an MR valve within the constraints of an existing commercial (passive) oleopneumatic shock strut. Previous work on MR landing gear has tended to focus on potential control strategies rather than design and sizing issues. However these latter aspects are of great importance in aircraft systems, where space and weight are vital design constraints. To aid the sizing analysis performed in this study, accurate quasi-steady and dynamic impact models of passive and MR oleopneumatic landing gears are developed. The model is validated against experimental data incorporating the passive device, which is then used as a benchmark for the MR designs and to assess fail safety. The dynamic model is particularly important as it incorporates fluid compressibility, which may be a significant contributor to the overall response of the device in an impact scenario. The present study also aims to give further insight into high velocity MR valve flow, which will be inevitable during impulsive loading. This area remains largely unexplored and particular importance is given to valve Reynolds number since turbulent values are known to reduce device performance. The feasibility of an MR landing gear will be largely dependant on these factors.

Paper Details

Date Published: 16 May 2005
PDF: 12 pages
Proc. SPIE 5760, Smart Structures and Materials 2005: Damping and Isolation, (16 May 2005); doi: 10.1117/12.599619
Show Author Affiliations
David C. Batterbee, The Univ. of Sheffield (United Kingdom)
Neil D. Sims, The Univ. of Sheffield (United Kingdom)
Roger Stanway, The Univ. of Sheffield (United Kingdom)
Zbigniew Wolejsza, The Institute of Aviation (Poland)

Published in SPIE Proceedings Vol. 5760:
Smart Structures and Materials 2005: Damping and Isolation
Kon-Well Wang, Editor(s)

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