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
J. Baumann et al., "Nonlinear Model for Landing Gear Shimmy," American Society of Mechanical Engineers (Paper), American Society of Mechanical Engineers (ASME), Jan 1991.
ASME Winter Annual Meeting
Mining and Nuclear Engineering
Mechanical and Aerospace Engineering
Keywords and Phrases
Dynamics; Kinematics-Mathematical Models; Mathematical Techniques - Nonlinear Equations; Structural Analysis - Dynamic Response
Article - Conference proceedings
© 1991 American Society of Mechanical Engineers (ASME), All rights reserved.
01 Jan 1991