GROUND RESONANCE PREVENTING DEVICE FOR HELICOPTER AND HELICOPTER PROVIDED WITH GROUND RESONANCE PREVENTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a ground resonance preventing device for a helicopter and the helicopter provided with this ground resonance preventing device. ;SOLUTION: In this ground resonance preventing device for a helicopter, based on a signal of an accelerometer 2 monitoring vibration by rotation of a rotor 10a of a helicopter, a variable electric field is generated by a variable electric field generating device. This variable field is applied to an electroviscous fluid damper 1 provided in a skid 11, viscosity of electroviscous fluid in the damper 1 is changed, a characteristic frequency of vibration mode of a helicopter airframe is changed, and generation of resonance by this vibration is prevented, so as to effectively damp this vibration.;COPYRIGHT: (C)1998,JPO