ROTOR AIR LOADS, BLADE MOTION, AND STRESS CAUSED BY TRANSIENT INPUTS OF SHAFT TORQUE AS RELATED TO STOPPABLE ROTOR OPERATION

Abstract

The transient-response calculation method is extended to yield aerodynamic loadings and elastic-blade motions in response to changes of shaft torque input. Loadings, bending moments, and modal responses are obtained for a teetering rotor experiencing both a 100- and a 50-percent power loss. Similarly, responses are computed for a hingeless rotor experiencing a 100- percent power loss and for a hingeless rotor being braked from an initial operational condition corresponding to 100-percent rpm and a nominal value of zero lift. This hingeless rotor is also started up from a stopped position. Examination of the results obtained in these computations indicates that (1) reasonable aerodynamic loadings can be predicted irrespective of the radial to tangetial velocity ratio and (2) no loading or structural response phenomena result in the examined flight condition which would indicate that power loss, braking, and rotor stopping have serious consequences with respect to the creation of unusual blade-wake interaction phenomena.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1967
Accession Number
AD0655268

Entities

People

  • L. Segel

Organizations

  • Calspan

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aerodynamic Forces
  • Aerodynamic Loading
  • Bending Moments
  • Computational Fluid Dynamics
  • Computational Science
  • Computations
  • Computer Programs
  • Convection
  • Equations Of Motion
  • Experimental Data
  • Mach Number
  • Modal Analysis
  • Resonant Frequency
  • Steady State
  • Structural Response
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Control Systems Engineering.
  • Educational Psychology