VIBRATION DAMPER FOR HELICOPTER ROTOR

摘要

PURPOSE: A vibration damper for a helicopter rotor is provided to have the satisfactory damping effect on the vibration of low amplitude as well as high amplitude. CONSTITUTION: The vibration damper comprises a driving element(10) and a rigid element(6) and includes a damper assembly functionally interconnecting the driving element and the rigid element. The damper assembly comprises a hydraulic damper device disposed in at least one viscous fluid cavity(3) and a laminated flexible device(1). The hydraulic damper device comprises first and second sets of interleaved plane vanes(40,50) and also has at least one damper element. The damper element is disposed in one of the viscous fluid cavities and secured to the driving element. The damper element has an outer outline to be tapered from a base(23) situated beside one axial end of the damper towards the apex situated beside the sets of plane vanes. Thereby satisfactory damping effect can be obtained.