Lead-lag dampers are present in most rotors to provide the required level of damping in all flight conditions. These dampers are a critical component of the rotor system but they also represent a major source of maintenance cost. A semi-active friction based lead-lag damper is proposed as a replacement for hydraulic and elastomeric dampers. In the semi-active damper, damping is provided by optimized energy dissipation using modulated frictional forces in joints. A conceptual design of a piezoelectric-actuated friction-based lag damper for a full-scale rotor is presented. A control law governing the actuation in the lag damper is designed to generate the desired level of damping for performing adaptive damping of individual blade lag motion. The investigation is extended to the ground resonance stability analysis of a comprehensive UH-60 model within the framework of finite element based multibody dynamics formulations.
The semi-active coulomb friction lead-lag damper concept
2006
9 Seiten, 6 Quellen
Conference paper
English
The Semi-Active Coulomb Friction Lead-Lag Damper Concept
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