Dynamic Analysis of Geared Rotors by Finite Elements

Abstract

A finite-element model of a geared rotor system on flexible bearings has been developed. The model includes the rotary inertia of shaft elements, the axial loading on shafts, flexibility and damping of bearings, material damping of shafts and the stiffness and the damping of gear mesh. The coupling between the torsional and transverse vibrations of gears were considered in the model. A constant mesh stiffness was assumed. The analysis procedure can be used for forced vibration analysis of geared rotors by calculating the critical speeds and determining the response of any point on the shaft to mass unbalances, geometric eccentricities of gears and displacement transmission error excitation at the mesh point. The dynamic mesh forces due to these excitation can also be calculated. The model has been applied to several systems for the demonstration of its accuracy and for studying the effect of bearing compliances on system dynamics.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1990
Accession Number
ADA230898

Entities

People

  • Ahmet Kahraman
  • Donald R. Houser
  • H. N. Ozguven
  • James J. Zakrajsek

Organizations

  • National Aeronautics and Space Administration

Tags

DTIC Thesaurus Topics

  • Army Aviation
  • Axial Loads
  • Bearings
  • Couplings
  • Dynamic Loads
  • Engineering
  • Equations
  • Finite Element Analysis
  • Frequency
  • Mechanical Engineering
  • Modal Analysis
  • Modulus Of Elasticity
  • Moment Of Inertia
  • Resonant Frequency
  • Static Loads
  • Stiffness
  • Transient Response Analysis

Fields of Study

  • Engineering

Readers

  • Control Systems Engineering.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).