Technical note. Robust multivariable control of rotorcraft in forward flight: Impact of bandwidth on fatigue life

James N. Rozak, Asok Ray

Research output: Contribution to journalArticle

20 Scopus citations


This paper presents the analysis and synthesis of a multivariable control systems for a UH-60 Black Hawk helicopter in forward flight by taking the fatigue life of critical components into consideration. In particular, this paper investigates the impact of the control system bandwidth on both the handling qualities of the helicopter and the fatigue life of a rotor component control horn. The results of non-linear model simulations of on-axis doublets and one maneuver reveals that fatigue life is very sensitive to the control system bandwidth and the level of initial damage. For example, a 45° right turn at 140 knots may cause a 148% increase in fatigue damage in the control horn for only a 1.3 radian per second increase in control system bandwidth.

Original languageEnglish (US)
Pages (from-to)195-201
Number of pages7
JournalJournal of the American Helicopter Society
Issue number3
Publication statusPublished - Jul 1 1998


All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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