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Nonlinear ground resonance of a helicopter with free play in rotorblades hinges

Dżygadło Z., Kowaleczko G.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

2000

nr 10

89-94

Results of the ground resonance phenomenon analysis are presented in the paper. The analysis has been carried out for a one-main rotor helicopter on the basis of a complete set of nonlinear differential equations. Basic equations of helicopter spatial motion, adopted from flight mechanics, have been modified by taking into account forces and moments produced by a landing gear.