H in flight

  • Ian Postlethwaite
  • Alex Smerlas
  • Daniel J. Walker
Part D Robust Control
Part of the Lecture Notes in Control and Information Sciences book series (LNCIS, volume 241)


This paper is about the flight testing of an H -controlled helicopter, the Bell 205 Airborne Simulator, carried out in Ottawa in July 1997. The tests are part of a major research activity between the University of Leicester (supported by the UK Engineering and Physical Sciences Research Council), the UK Defense and Evaluation Research Agency (Bedford), the Canadian NRC Flight Research Laboratory (Ottawa), and GKN Westland Helicopters. This is thought to be the first time that an H controller has been used on a helicopter in flight.


Flight Test Main Rotor Physical Science Research Council Handling Quality Flight Test Data 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    A. Yue and I. Postlethwaite. Improvement of Helicopter Handling Qualities Using H Optimisation. IEEE Proceedings, D:115–129, 1990.Google Scholar
  2. [2]
    D.J. Walker, I.Postlethwaite, J.Howitt, and N.P.Foster. Rotorcraft Flying Qualities Improvement Using Advanced Control. American Helicopter Society/NASA Conference on Flying Qualities and Human Factors, page No.2.3.1, 1993.Google Scholar
  3. [3]
    D.J. Walker and I. Postlethwaite. Advanced Helicopter Flight Control Using Two-Degrees-of-Freedom Optimal Control. Journal of Guidance Control and Dynamics, 19(2):461–468, 1996.zbMATHCrossRefGoogle Scholar
  4. [4]
    A.J. Smerlas, I.Postlethwaite, and D.J.Walker. Full Envelope Robust Control Law for the Bell-205 Helicopter. Proceedings. of the 22nd European Rotorcraft Forum, 17–19 Sept., Brighton, UK, pages 105.1–105.6, September 1996.Google Scholar
  5. [5]
    A.J. Smerlas, I.Postlethwaite, and D.J.Walker. Robust Gain Scheduling in Helicopter Control. Proceedings of the 23rd European Rotorcraft Forum, 16–18 Sept., Treff Hotel, Dresden, Germany, pages 84.1–84.5, 1997.Google Scholar
  6. [6]
    G. Cooper and R. Harper. The use of pilot rating in the evaluation of aircraft handling qualities. Technical Report D-5153, NASA, USA, 1986.Google Scholar
  7. [7]
    R.K. Heffley, W.F. Jewell, J.M. Lehman, and R.A. Van Winkle. A Compilation and Analysis of Helicopter Handling Qualities Data. Contractor Report 3144, NASA, 1979.Google Scholar
  8. [8]
    S.W. Baillie, J.M.Morgan, and K.R.Goheen. Practical Experiences in Control Systems Design using the NCR Bell 205 Airborne Simulator. Flight Mechanics Panel Symposium, pages 27.1–27.12, January 1994.Google Scholar
  9. [9]
    D. McFarlane and K. Glover. An H Design Procedure Using Robust Stabilization of Normalized Coprime Factors. Proceedings of the 27th Conference on Decision and Control, pages 1343–1348, December 1988.Google Scholar
  10. [10]
    D. McFarlane and K. Glover. Robust Controller Design Using Normalized Coprime Factor Plant Descriptions. Information and Control Sciences. Springer-Verlag, 1990.Google Scholar
  11. [11]
    J. Sefton and K. Glover. Pole-Zero Cancellations in the General H Problem with Reference to a Two Block Design. Systems & Control Letters, 14:295–306, 1990.zbMATHCrossRefMathSciNetGoogle Scholar
  12. [12]
    Anonymous. Handling Qualities Requirements for Military Rotorcraft, Aeronautical Design Standard ADS-33C. Technical report, US Army AVSCOM, St. Louis, Missouri, 1989.Google Scholar
  13. [13]
    D. Hoyle, R. Hyde, and D.J.N. Limebeer. An H Approach to Two-Degree-Of-Freedom Design. Proceedings of the IEEE CDC, pages 1581–1585, December 1991.Google Scholar
  14. [14]
    G.D. Padfield, M.T. Charlton, Maj. T. Mace, and Maj. R. Morton. Flying Qualities Evaluation of the UK Attack Helicopter Contenders Using the ADS-33 Methodology; Clinical Criteria and Piloted Simulation Trials. 21st European Rotorcraft Forum, Saint Petersburg, Russia, 2:IV–2.1-IV2.20, Aug. 30–Sept. 1 1995.Google Scholar

Copyright information

© Springer-Verlag London Limited 1999

Authors and Affiliations

  • Ian Postlethwaite
  • Alex Smerlas
  • Daniel J. Walker
    • 1
  1. 1.Department of EngineeringUniversity of LeicesterLeicesterUK

Personalised recommendations