EFFECTS OF LANDING GEAR NONLINEARITIES ON GROUND RESONANCE OF HELICOPTER

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One of key targets in helicopter design is to be free from ground-resonance, which may occur when lead-lag frequency of rotor is coupled with natural frequencies of rotor-fuselage-landing gear system. Typical analytical approach to this problem is based on simplified linear modeling for the landing gear. In practice, however, the landing gear has nonlinear characteristics not only when touching down but also when operating on ground, depending on stroke, velocity and friction of oleo-pneumatic shock absorber in the landing gear. In this study, a method is proposed to predict the vibration severity and unstable range of rotor speed, by including the nonlinear characteristics in the landing gear. Then, effects of landing gear nonlinearities will be discussed.
Publisher
ICSV
Issue Date
2007
Citation

The Fourteenth International Congress on Sound and Vibration (ICSV14)

URI
http://hdl.handle.net/10203/6005
Appears in Collection
ME-Conference Papers(학술회의논문)

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