Use of Photogrammetry to Measure a Plate Vibration Mode

Abstract

Photogrammetry is used to measure the coordinates of points on the surface of three-dimensional bodies. The present report describes a preliminary experiment in the use of photogrammetry to determine the vibration mode shape of structure. Synchronised stroboscopic illumination was used to freeze the motion of a plate undergoing sinusoidal excitation at a natural frequency whilst a number of photographs were taken at different phase angles through the cycle of oscillation. The motion of the plate was non-sinusoidal due to the presence of non-linearities so a weighted least squares process was used to determine the required mode shape. This mode shape is compared with that measured by a more traditional method. Keywords: Australia.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1990
Accession Number
ADA227753

Entities

People

  • Betty Emslie
  • P. A. Farrell
  • T. G. Ryall

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Accelerometers
  • Air Force
  • Aircrafts
  • Cameras
  • Department Of Defense
  • Engineering
  • Equations
  • Frequency
  • Interpolation
  • Materials
  • Materials Engineering
  • Measurement
  • Photographs
  • Resonant Frequency
  • Three Dimensional
  • Vibration

Readers

  • Computer Vision.
  • Control Systems Engineering.
  • Structural Dynamics.