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Sikorsky Aircraft: Achieving Helicopter Vibration Reduction through Improved Interactional Aerodynamic Modeling

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The information below was gathered from the 2018 Simcenter Conference - Americas that took place October 15-17 in Detroit, Michigan.

 

Author: Charles Berezin, Lockheed Martin Fellow

 

Interference effects of the helicopter rotor and hub on tail surfaces can be a significant source of unwanted vibration.  This can be a difficult problem to predict due to the complicated geometry and motion.  Additionally, transport of disturbances from the source (rotor and hub) to the receiver (tail surfaces) puts additional requirements on the volume grid.  STAR-CCM+ was used to predict tail vibrations on a UH-60M aircraft in several flight conditions.  Comparison with flight test showed that accurate tail air load predictions are now within reach.  Proposed uses of this capability include introducing active tail elements to counteract the aerodynamic loads.  STAR-CCM+ is proposed to be used in this effort.  Results to date and proposed additional work will be presented.