The Inter-2-Blade Lead-Lag Damper Concept

Abstract:
A novel concept of inter-blade damper rotor hub arrangement is proposed. Inter-blade lead-lag dampers currently used in some helicopters connect adjacent blades; their damping effect is associated with the relative lead-lag motion of the blades. In the proposed arrangement, called 'inter-2-blade,' dampers connect non-adjacent blades. The proposed arrangement improves ground-resonance stability and reduces harmonic components of the loads in the dampers. The Deutsch criterion for the sizing of lead-lag dampers is generalized to the inter-blade and inter-2-blade arrangements.

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