Individual Blade Pitch Control (IBC) for Vibration Reduction of Lift-Offset Coaxial Rotor Vehicles with Auxiliary Propulsion

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The present study investigates the vibration reduction potential of single harmonic individual blade pitch control (IBC) applied to a lift-offset coaxial main rotor. An open-loop phase sweep is conducted using comprehensive aeroelastic simulations of the XH-59A rotor to quantify the effects of IBC on the hub vibration index and the rotor effective lift-to-drag ratio. Applying 4/rev, 1° amplitude IBC at 0° phase to both rotors decreased the hub vibration index by 64% at 200 knots and only decreased the rotor lift-to-drag ratio by 2%. Single harmonic IBC retained effective hub vibration index reduction with varying flight speed, including a 56% decrease at 160 knots and a 69% decrease at 240 knots. Higher amplitude IBC inputs were more effective at higher forward flight speeds. The vibration reduction of single harmonic IBC with 2° pitch amplitude increased from 24% to 69% when the forward flight speed increased from 160 to 240 knots. Application of a closed-loop control algorithm using multiple-harmonic IBC achieved an 84% decrease in the hub vibration index with only a 2% decrease in the rotor effective lift-to-drag ratio.

Original languageEnglish (US)
Title of host publicationFORUM 2023 - Vertical Flight Society 79th Annual Forum and Technology Display
PublisherVertical Flight Society
ISBN (Electronic)9781713874799
StatePublished - 2023
Event79th Vertical Flight Society Annual Forum and Technology Display, FORUM 2023 - West Palm Beach, United States
Duration: May 16 2023May 18 2023

Publication series

NameFORUM 2023 - Vertical Flight Society 79th Annual Forum and Technology Display

Conference

Conference79th Vertical Flight Society Annual Forum and Technology Display, FORUM 2023
Country/TerritoryUnited States
CityWest Palm Beach
Period5/16/235/18/23

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Control and Systems Engineering

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