High-Speed Rotor Dynamics - An Assessment of Current Technology for Small Turboshaft Engines

Abstract

Problem areas connected with rotor dynamics which are peculiar to the special requirements of rotor-bearing systems in the class of small turboshaft engines being developed for U.S. Army helicopters are identified. The present and past philosophy of design is discussed, including the impact of the demand for front drives. Methods for critical speed prediction and high-speed balancing are reviewed. The trend to higher speeds is seen to require consideration of new approaches to balancing through flexural modes. The major parameters available for control by the designer are shown to be the bearing support properties, and recommendations are made for improving the accuracy of prediction of these properties.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1974
Accession Number
AD0787319

Entities

People

  • John M. Vance

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Aircraft Engines
  • Aircrafts
  • Army Aircraft
  • Bearings
  • Computer Programs
  • Equations
  • Friction
  • Gas Bearings
  • Gas Turbines
  • Heat Transfer
  • Helicopter Engines
  • Mechanical Engineering
  • Mechanics
  • Turbines
  • Turbojet Engines
  • Turboshaft Engines

Readers

  • Aerospace Engineering
  • Systems Analysis and Design