Outer-loop control design and simulation handling qualities assessment for a coaxial-compound helicopter and tiltrotor

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

Research output: Contribution to conferencePaperpeer-review

3 Scopus citations

Abstract

This paper describes the development of full flight envelope dynamic inversion outer-loop control laws used to control airspeed and flight path for two Future Vertical Lift-relevant rotorcraft configurations-a lift offset coaxial helicopter with a pusher propeller and a tiltrotor. The outer-loop control laws for both aircraft include a control allocation scheme to account for redundant controls and reduce pilot workload. A piloted simulation experiment was conducted at the Penn State Flight Simulator facility using a series of high-speed handling qualities demonstration maneuvers to evaluate the handling qualities of the control laws. Overall, the outer-loop control laws for both coaxial-pusher and tiltrotor aircraft were assigned Level 1 handling qualities for the Break Turn and High-Speed Acceleration/Deceleration tasks, and reduced pilot workload over previously developed inner-loop control laws. The outer-loop control laws also improved performance and reduced pilot workload in a formation flying task developed for this experiment. The coaxial-pusher outer-loop control laws received borderline Level 1/Level 2 ratings for the Pitch Attitude Capture and Hold and Sum-of-Sines Tracking tasks, while the tiltrotor outer-loop control laws (with their increased value of pitch attitude dropback) received Level 2 ratings.

Original languageEnglish (US)
StatePublished - 2020
EventVertical Flight Society's 76th Annual Forum and Technology Display - Virtual, Online
Duration: Oct 5 2020Oct 8 2020

Conference

ConferenceVertical Flight Society's 76th Annual Forum and Technology Display
CityVirtual, Online
Period10/5/2010/8/20

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Control and Systems Engineering

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