INVESTIGATION OF ELASTIC COUPLING PHENOMENA OF HIGH SPEED RIGID ROTOR SYSTEMS

Abstract

The report describes an investigation of the effects of variations in design parameters on the dynamic characteristics of cantilever blade or 'rigid' rotors. Some fundamental concepts of rigid rotor dynamics including decoupling are presented, as well as a 10-degree-of-freedom rotor stability analysis in hovering and a brief study of the static stability of the model. A dynamic helicopter wind tunnel model having a 10-foot rotor diameter was constructed with three sets of blades and a hub which allowed many variations in geometry and stiffness. Seven rotor configurations were tested. The model and rotors and the testing technique are described, and all the data collected are included. A principal focus of the program was the decoupled, or 'matched blade', type of rigid rotor. It was demonstrated to simulated air speeds on the order of 240 miles per hour that this type of rotor is stable with extremely small values of control gyro inertia. In addition, it was found that blade matching has a major influence on chordwise oscillating blade loads.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1964
Accession Number
AD0604030

Entities

People

  • John E. Yeates

Organizations

  • Lockheed Martin

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aerodynamic Characteristics
  • Army Aviation
  • Dynamics
  • Frequency
  • Geometry
  • Helicopters
  • Mach Number
  • Resonant Frequency
  • Reynolds Number
  • Synchronous Motors
  • Test And Evaluation
  • Three Dimensional
  • Two Dimensional
  • Vibration
  • War Colleges
  • Wind Tunnel Models
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Aerospace Engineering
  • Control Systems Engineering.