Dynamic Characteristic Study of Hingeless Blade Stiffness Reinforcement for Bearingless Rotor Whirl Tower Test

摘要

Whirl tower test is conducted basically during helicopter rotor system development process. For whirlrntower test of rotor hub system, new designed blade or existing blade which is modified for new rotor hubrnsystem is used. BO-105 helicopter blade which has simple shape and efficient aerodynamic characteristicrnhas been used to helicopter rotor hub development project widely. Originally BO-105 blade was used forrnhingeless hub system and blade root is flexure. Flap bending stiffness and lag bending stiffness at BO-105rnblade root area is relatively low compare with airfoil area. So, in order to apply the BO-105 blade tornbearingless hub, blade root area must be reinforced. And in this process, blade root area's section propertyrnis changed. In this paper, we suggest reinforcement method of BO-105 blade root area and study dynamicrncharacteristic of bearingless rotor system with reinforcement BO-105 blade.