Effects of Blade-to-Blade Dissimilarities on Rotor-Body Lead-Lag Dynamics,

Abstract

Small blade-to-blade property differences are investigated to determine their effects on the behavior of a simple rotor-body system. An analytical approach is used which emphasizes the significance of these effects from the experimental point of view. It is found that the primary effect of blade-to-blade dissimilarities is the appearance of additional peaks in the frequency spectrum which are separated from the conventional response modes by multiples of the rotor speed. These additional responses are potential experimental problems because when they occur near a mode of interest they act as contaminant frequencies which can make damping measurements difficult. The effects of increased rotor-body coupling and a rotor shaft degree of freedom act to improve the situation by altering the frequency separation of the modes. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1985
Accession Number
ADA160497

Entities

People

  • M. J. Mcnulty

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Amplitude
  • Army Aviation
  • Coordinate Systems
  • Couplings
  • Data Analysis
  • Differential Equations
  • Eigenvalues
  • Equations
  • Equations Of Motion
  • Experimental Data
  • Frequency
  • Frequency Domain
  • Linear Differential Equations
  • Measurement
  • Physical Properties
  • Resonant Frequency
  • Spectra

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Aerospace Engineering
  • Systems Analysis and Design