RESEARCH PAPERS: Papers on Transportation

Longitudinal Instability in Braked Landing Gear

[+] Author and Article Information
R. R. Allen

School of Engineering and Applied Science, University of California, Los Angeles, Calif. 90024

R. C. O’Massey

Civil/Mechanical Technology, Douglas Aircraft Company, Long Beach, Calif. 90846

J. Dyn. Sys., Meas., Control 103(3), 259-265 (Sep 01, 1981) (7 pages) doi:10.1115/1.3140637 History: Received January 29, 1980; Online July 21, 2009


An instability in the form of a self-excited, bounded longitudinal oscillation may occur in aircraft landing gear when one or more wheels lock due to excessive braking. The instability usually appears at ground speeds below 40 knots (20 m/s) and results from interaction between structural elasticity and the nonlinear characteristics of tire-runway friction. A nonlinear mathematical model is developed to study the dynamics of this divergence in a braked, dual tire landing gear. Analytical methods are presented to determine critical ground speeds in terms of runway friction characteristics and to predict the amplitude of steady-state oscillations. The effect of design variables on longitudinal stability is evaluated and design guidelines are presented which insure reduction of the severity of this divergent dynamic behavior.

Copyright © 1981 by ASME
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