AN EXPERIMENTAL INVESTIGATION OF ROTOR HARMONIC AIRLOADS INCLUDING THE EFFECTS OF ROTOR-ROTOR INTERFERENCE AND BLADE FLEXIBILITY

Abstract

Experimental airload harmonics from the first to the tenth at various blade spanwise stations are presented for single and rear tandem rotor configurations for various rotor angles of attack, tip-speed ratios, and thrust loadings. The results include the effect of blade bending motion on airload harmonics for selected test cases. Evaluation of the experimental results indicates several general conclusions of importance with regard to vibration levels of compound helicopters, tandem helicopters, and three- and four-bladed rotors.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1965
Accession Number
AD0615922

Entities

People

  • Norman D. Ham
  • Paul A. Madden

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Army Aviation
  • Dynamic Response
  • Flight Speeds
  • Frequency
  • Gages
  • Measurement
  • Pressure Gages
  • Pressure Measurement
  • Pressure Transducers
  • Resonant Frequency
  • Statistical Analysis
  • Steady State
  • Strain Gages
  • Transducers
  • Transportation
  • United States
  • Vibration

Fields of Study

  • Physics

Readers

  • Aerodynamics.