Gain-Scheduled Higher Harmonic Control for Full Flight Envelope Vibration Reduction
Name
AHSF2014_8.pdf
Size
1.38 MB
Format
Adobe PDF
Checksum (MD5)
464e51741c2af164e5f5e1514e7c06f1
Author(s)
Fan, Frank H.
Hall, Steven
Date Issued
May 2014
Journal
Proceedings of the American Helicopter Society 70th Annual Forum
Publisher
American Helicopter Society International, Inc.
Citation
Fan, Frank H., and Steven R. Hall. "Gain-Scheduled Higher Harmonic Control for Full Flight Envelope Vibration Reduction." American Helicopter Society 70th Annual Forum (May 2014).
Version
Author's final manuscript
Abstract
This paper investigates the dynamics of the SMART rotor, and presents a method to design a gain-scheduled controller to reduce the harmonic vibration throughout the flight envelope. The dynamics of the SMART rotor was examined at various flight conditions through nonlinear simulation. The simulation results showed that the dynamics is strongly dependent on the advance ratio, but only weakly dependent on the blade loading and the rotor shaft angle. To reduce the higher harmonic vibration throughout the flight envelope, a controller gain-scheduled on the advance ratio is presented. Output from linear time-invariant higher harmonic controllers designed for different flight conditions are blended to form the gain-scheduled controller. Closed-loop simulations of the helicopter rotor undergoing transitional flight with increasing advance ratio were conducted. The results from the closed-loop simulations show that the 5 per rev normal vibration was reduced by over 97% at the rotor hub.
MIT Department
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://vtol.org/store/product/gainscheduled-higher-harmonic-control-for-full-flight-envelope-vibration-reduction-9498.cfm
