  Shimmy is a dangerous phenomenon that occurs when aircraft's nose landing
gears oscillate in a rapid and uncontrollable fashion. In this paper, we
propose the use of two nonlinear control approaches (zero average control and
model reference adaptive control based on minimal control synthesis) as simple
yet effective strategies to suppress undesired oscillations, even in the
presence of uncertainties and partial state measurements. Numerical results are
presented to validate the proposed control approaches.
