Nonlinear Model for Landing Gear Shimmy


In the landing gear of a taxiing aircraft, shimmy is a condition of self-excited oscillation driven by the interaction between the tire and the ground. In extreme cases shimmy can cause severe damage to the landing gear hardware or even the loss of the aircraft. In less extreme cases, shimmy is little more than an annoyance. However, it does affect pilot satisfaction and comfort and can lead to added maintenance expense. This paper will consider a nonlinear shimmy model that includes components and features typically found in the nose landing gear of fighter aircraft. The gear structural model includes inertia, coulomb and viscous damping, stiffness, tire flexibility and torsional freeplay. Experience has shown that torsional freeplay can contribute to the development of shimmy. This effect is also observed in model simulations. Application of this program to existing aircraft has given results consistent with these observed in the field

Meeting Name

ASME Winter Annual Meeting


Mining Engineering

Second Department

Mechanical and Aerospace Engineering

Keywords and Phrases

Dynamics; Kinematics-Mathematical Models; Mathematical Techniques - Nonlinear Equations; Structural Analysis - Dynamic Response

Document Type

Article - Conference proceedings

Document Version


File Type





© 1991 American Society of Mechanical Engineers (ASME), All rights reserved.

Publication Date

01 Jan 1991

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