Abstract
This work investigates shimmy oscillations in the nose landing gear of a passenger aircraft and studies how they depend on changes in the tire inflation pressure. To achieve this, a mathematical model of a landing gear is considered that includes the influence of the tire pressure via different tire properties, such as cornering force and contact patch length. Experimental data obtained from two radial tires are used as a basis for modeling the influence of inflation pressure on tire properties. Bifurcation analysis of the mathematical model is then performed. It yields stability diagrams in the plane of velocity and vertical force for different values of the tire inflation pressure. Specifically, two-parameter bifurcation diagrams for five different inflation pressures are presented. This allows the conclusion that for the type of tires considered, the landing gear is less susceptible to shimmy oscillations at higher than nominal inflation pressures.
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