Journal of Theoretical
and Applied Mechanics

38, 1, pp. 65-91, Warsaw 2000

Ground resonance of a helicopter

Zbigniew Dżygadło, Grzegorz Kowaleczko
A method of the ground resonance phenomenon analysis is presented in this paper. It has been carried out for a one-main rotor helicopter on the basis of a complete set of nonlinear differential equations, known in flight mechanics. It has been modified by taking into account the forces and moments produced by a landing gear. Some results of numerical calculations for two models of landing gear-ground interactions are shown.
Keywords: ground resonance; nonlinear helicopter dynamics