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http://dx.doi.org/10.5139/JKSAS.2011.39.7.605

Non-linear Shimmy Analysis of a Nose Landing Gear with Friction  

Yi, Mi-Seon (한국항공대학교 항공우주 및 기계공학과)
Bae, Jae-Sung (한국항공대학교 항공우주 및 기계공학부)
Hwang, Jae-Hyuk (한국항공대학교 항공우주 및 기계공학부)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.39, no.7, 2011 , pp. 605-611 More about this Journal
Abstract
Shimmy is a self-excited vibration in lateral and torsional directions of a landing gear during either the take-off or landing. It is caused by a couple of conditions such as a low torsional stiffness of the strut, a free-play in the landing gear, a wheel imbalance, or worn parts, and it may make the aircraft unstable. This study was performed for an analysis of the shimmy stability on a small aircraft. A nose landing gear was modeled as a linear system and characterized by state-equations which were used to analyze the stability both in the frequency and time-domain for predicting whether the shimmy occurs and investigating a good design range of the important parameters. The root-locus method and the 4th Runge-Kutta method were used for each analysis. Because the present system has a simple mechanism using a friction to reinforce the stability, the friction, a non-linear factor, was linearized by a describing function and considered in the analysis and observed the result of the instability reduction.
Keywords
Shimmy; Nose Landing Gear; Stability Analysis; Friction; Limit Cycle Oscillation;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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