PROPELLER BLADE VIBRATION AND STRESS ANALYSIS

Abstract

Presented is a computer program for generating the natural frequencies, mode shapes, and modal stress distributions for the ten lowest modes of vibration of propeller blades. This information, coupled with the fact that the eigenvectors are normalized with respect to the strain energy matrix is sufficient to conduct any response analyses of propeller blades. After accepting the input data which describe the blade geometry, the program generates a polynomial which fits, in the least squares sense, the camber distribution over the planform of the blade. The program then constructs a quadrature mesh which is later used to integrate the strain energy and kinetic energy, matrices over the blade planform. The two-matrix eigenvalue problem is reduced to a one matrix eigenvalue problem by factoring the strain energy matrix in triple- precision. This problem is then solved, and the resulting eigenvalues and eigenvectors are written as output. The relative stresses and displacements are calculated at mesh points over the blade planform, and are written as output.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1963
Accession Number
AD0423377

Entities

People

  • Edward Lieberman

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Computer Programs
  • Computers
  • Equations
  • Fluid Dynamics
  • Fluid Mechanics
  • Frequency
  • Geometry
  • Leading Edges
  • Mechanics
  • Model Basins
  • Modulus Of Elasticity
  • New York
  • Plastic Explosives
  • Propeller Blades
  • Resonant Frequency
  • Ship Model Basins

Readers

  • Aerospace Engineering
  • Computational Modeling and Simulation
  • Fluid Dynamics.