FREE VIBRATION CHARACTERISTICS OF MULTIPLE LOAD PATH BLADES BY THE TRANSFER MATRIX METHOD.

V. R. Murthy, Arun M. Joshi

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The determination of free vibrational characteristics is basic to any dynamic design, and these characteristics can form the basis for aeroelastic stability analyses. Conventional helicopter blades are typically idealized as single-load path blades, and the transfer matrix method is well suited to analyze such blades. Several current helicopter dynamic programs employ transfer matrices to analyze the rotor blades. In this paper, however, the transfer matrix method is extended to treat multiple-load-path blades, without resorting to an equivalent single-load-path approximation. With such an extension, these current rotor dynamic programs which employ the transfer matrix method can be modified with relative ease to account for the multiple load paths. Unlike the conventional blades, the multiple-load-path blades require the introduction of the axial degree-of-freedom into the solution process to account for the differential axial displacements of the different load paths. The transfer matrix formulation is validated through comparison with the finite-element solutions.

Original languageEnglish (US)
Pages (from-to)43-50
Number of pages8
JournalJournal of the American Helicopter Society
Volume31
Issue number4
DOIs
StatePublished - 1986

ASJC Scopus subject areas

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

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