High-speed rotorcraft pitch axis response type investigation

Tom Berger, Mark B. Tischler, Joseph F. Horn

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

Abstract

This paper presents a systematic investigation of high-speed rotorcraft pitch-axis response types, command models, and handling-qualities specifications. The investigation was done using two Future Vertical Lift-relevant rotorcraft configurations-a lift offset coaxial helicopter with a pusher propeller and a tiltrotor. Five response types were investigated, consisting of: a pitch rate-command/attitude-hold response type typically used for rotorcraft, a pitch rate-command/attitude-hold response type using a higher-order command model based on the conventional airplane pitch rate transfer function, a normal acceleration/angle-of-attack hold response type, a flight path rate command/flight path hold response type, and a “blended” flight path rate command response type which varies the command model bandwidth based on stick input size. Designs of varying levels of pitch attitude bandwidth, flight path bandwidth, control anticipation parameter, and pitch attitude dropback were evaluated in a piloted simulation experiment conducted at the Penn State Flight Simulator facility using two high-speed Mission Task Elements. The results of the piloted simulation suggest that both the pitch attitude bandwidth and the pitch attitude dropback requirements must be met for Level 1 handling qualities. In addition, the current fixed-wing boundary for pitch attitude dropback appears to be too loose for high speed rotorcraft, and should be tightened to better match with pilot ratings. A set of recommended specifications and associated updated Level boundaries is provided in the Appendix.

Original languageEnglish (US)
Title of host publication77th Annual Vertical Flight Society Forum and Technology Display, FORUM 2021
Subtitle of host publicationThe Future of Vertical Flight
PublisherVertical Flight Society
ISBN (Electronic)9781713830016
StatePublished - 2021
Event77th Annual Vertical Flight Society Forum and Technology Display: The Future of Vertical Flight, FORUM 2021 - Virtual, Online
Duration: May 10 2021May 14 2021

Publication series

Name77th Annual Vertical Flight Society Forum and Technology Display, FORUM 2021: The Future of Vertical Flight

Conference

Conference77th Annual Vertical Flight Society Forum and Technology Display: The Future of Vertical Flight, FORUM 2021
CityVirtual, Online
Period5/10/215/14/21

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Control and Systems Engineering

Cite this