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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/18692

Title: Numerical continuation analysis of a dual-sidestay main landing gear mechanism
Authors: Knowles, James A.C.
Krauskopf, Bernd
Lowenberg, Mark H.
Neild, Simon A.
Thota, P.
Issue Date: 2014
Publisher: © American Institute of Aeronautics and Astronautics
Citation: KNOWLES, J.A.C. ...et al., 2014. Numerical continuation analysis of a dual-sidestay main landing gear mechanism. Journal of Aircraft, 51(1), pp.129-143.
Abstract: A model of a three-dimensional dual-sidestay landing gear mechanism is presented and employed in an investigation of the sensitivity of the downlocking mechanism to attachment point deflections. A motivation for this study is the desire to understand the underlying nonlinear behavior, which may prevent a dual-sidestay landing gear from downlocking under certain conditions. The model formulates the mechanism as a set of steady-state constraint equations. Solutions to these equations are then continued numerically in state and parameter space, providing all state parameter dependencies within the model from a single computation. The capability of this analysis approach is demonstrated with an investigation into the effects of the aft sidestay angle on retraction actuator loads. It was found that the retraction loads are not significantly affected by the sidestay plane angle, but the landing gear’s ability to be retracted fully is impeded at certain sidestay plane angles. This result is attributed to the landing gear’s geometry, as the locklinks are placed under tension and cause the mechanism to lock. Sidestay flexibilities and attachment point deflections are then introduced to enable the downlock loads to be investigated. The investigation into the dual sidestay’s downlock sensitivity to attachment point deflections yields an underlying double-hysteresis loop, which is highly sensitive to these deflections. Attachment point deflections of a few millimeters were found to prevent the locklinks from automatically downlocking under their own weight, hence requiring some external force to downlock the landing gear. Sidestay stiffness was also found to influence the downlock loads, although not to the extent of attachment point deflection.
Description: This paper was accepted for publication in the journal Journal of Aircraft and the definitive published version is available at http://dx.doi.org/10.2514/1.C032130
Version: Accepted for publication
DOI: 10.2514/1.C032130
URI: https://dspace.lboro.ac.uk/2134/18692
Publisher Link: http://dx.doi.org/10.2514/1.C032130
ISSN: 0021-8669
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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