S p e c if ic a t io n s
작성일자 : 2017. 2. 7.
품
명
영문 : Procurement of Elastomeric Lead-lag Dampers of
Small Scale Rotor Hub for Rotor Wind Tunnel Test
모 델 명
Elastomeric lead-lag damper
세부 사양
(1) Configuration
- Damper length between two rod end bearings is 85mm.
- The diameter or width of damper is less than 35mm.
(2) Damper loads
- Damper should withstand the maximum tension load of 600N and the
maximum compression load of 900N.
(3) Stiffness and damping
- Elastomeric dampers have the characteristics of elastic and damping and
complex stiffness is expressed as follows
K* = K' + j×K"
- Target stiffness and damping values of a damper
- Primary operating frequency for damper design is 1/rev and damper should
be designed to match the target values of stiffness and damping at 1/rev
requirements within 20% tolerance.
(4) Test
- Acceptance test reports for dampers should be provided.
Frequency
K′ (N/mm)
K (N/mm)
″
14.4 Hz(0.5/rev)
239
67
28.7 Hz(1/rev)
327
100