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Comprehensive Landing Gear Shimmy Analysis

Authors: [tex2html_wrap4312]C. Deng, G.X. Li, J. Angeles

Investigator username: angeles

Category: robotics

Subcategory: modelling and simulation

Aircraft landing gear shimmy is the self-induced swivelling characterized by the rapid build-up of a high-frequency oscillation accompanied by the shudder progressing along the aircraft from the gear to the trail surface. Not only does shimmy create nuisance in taxiing steering control, but can also lead to irreparable damage of the aircraft.

In this project, a new approach is introduced to formulate the landing-gear shimmy problem by a finite element formulation of the structure, while incorporating a comprehensive tire model. The dynamics model under non-holonomic constraints obtained with the natural orthogonal complement. A criterion on the dynamic stability of the system is formulated that can be used in virtually any type of landing-gear systems. A correlation with the results of tests and theoretical models is reported. Simulation is performed with DADS and comparison is made with the theoretical models.