| 摘要 |
A lead lag damper (10, 11) for a helicopter rotor unit has a rotor and a hub (8). The rotor has an N number of rotor modes, wherein the N is the number of blades. The single lead lag damper (10, 11), which is the center part of the rotor unit, is essentially formed into the shape of a cylinder. Elastomeric substance shearing elements arranged between a first surface (7) and a second surface (9) has constant tolerance against shearing strain and are axially loaded in advance so that the lead lag damper (10, 11) can constantly act in rotor inplane eigenmodes. Thus, the lead lag damper (10, 11) acts as a single unit in the critical inplane modes of a rotor having an N number of identical blades (1-4). Elastomeric substances are loaded by the constant shearing strain in contrast with ordinarily used vibration strain. |
