Coupled rotor/wing optimization procedure for high speed tilt-rotor aircraft

Thomas R. McCarthy, Aditi Chattopadhyay, Sen Zhang

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

11 Scopus citations

Abstract

A multidisciplinary optimization procedure is developed to investigate the design trade-offs associated with coupled rotor/wing performance in high speed tilt-rotor aircraft. The aerodynamic efficiency of the rotor in both hover and high speed cruise are coupled with the aerodynamic and aeroelastic performance of the wing while maintaining structural integrity of the wing/rotor configuration. The objectives are to maximize the hover figure of merit and the high speed cruise propulsive efficiency of the rotor and to minimize the wing weight. Constraints on the rotor include the first natural frequency in hover, the autorotational inertia and the blade weight. To avoid whirl flutter instabilities, constraints are imposed on the real part of the stability roots in the windmill flight condition. Constraints are also imposed on wing root stresses in both hover and cruise. An isotropic box beam model is used to represent the structural properties of the wing-box section. Design variables include rotor and wing planform variables and individual wall thicknesses in the wing. The Kreisselmeier-Steinhauser function approach is used to formulate the multiobjective optimization problem. A nonlinear programming technique based on the Broyden-Fletcher-Goldfarb-Shanno method is used as the optimization algorithm. The two-point exponential expansion approximation technique and a variable move limit scheme are used to reduce the computational effort. The optimum design is compared with an existing advanced tilt-rotor performance which is used as the baseline design. The results show significant improvements in both aerodynamic and structural performance without degradation of the aeroelastic stability.

Original languageEnglish (US)
Title of host publicationAnnual Forum Proceedings - American Helicopter Society
PublisherAmerican Helicopter Soc
Pages924-936
Number of pages13
Volume2
StatePublished - 1995
EventProceedings of the 1995 51st Annual Forum. Part 1 (of 3) - Fort Worth, TX, USA
Duration: May 9 1995May 11 1995

Other

OtherProceedings of the 1995 51st Annual Forum. Part 1 (of 3)
CityFort Worth, TX, USA
Period5/9/955/11/95

ASJC Scopus subject areas

  • Aerospace Engineering
  • Transportation

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    McCarthy, T. R., Chattopadhyay, A., & Zhang, S. (1995). Coupled rotor/wing optimization procedure for high speed tilt-rotor aircraft. In Annual Forum Proceedings - American Helicopter Society (Vol. 2, pp. 924-936). American Helicopter Soc.