Vibration Analysis Using Shadow Speckle Metrology and Line Broadening Techniques,

Abstract

This paper describes the application of two different computer based optical methods for locating the positions ans amplitudes of nodes and antinodes in vibrating members. In a technique called shadow speckle metrology, artificial speckles are projected at an angle onto a vibrating surface using a 35mm projector and a speckled slide. In the second technique called line broadening, a single line is used for projection. The vibrating surface and the projected images are captured either directly using a vidicon camera/digitizer system, or indirectly using an ordinary camera to record a time average photograph which is digitized subsequently. Computer programs compare these images to images recorded prior to excitation in order to determine the mode shape and the amplitude of vibration. Keywords: Vibration Analysis, Modal Analysis, Speckle Metrology; Reprints.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1987
Accession Number
ADA178626

Entities

People

  • David L. Lehner
  • Donald R. Matthys
  • John A. Gilbert
  • T. D. Dudderar

Organizations

  • University of Alabama in Huntsville

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Amplitude
  • Cameras
  • Computer Programs
  • Data Analysis
  • Dynamic Response
  • Excitation
  • Frequency
  • Intensity
  • Measurement
  • Military Research
  • Modal Analysis
  • Photographs
  • Photography
  • Still Projectors
  • Transverse
  • Universities
  • Vibration

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Image Processing and Computer Vision.
  • Structural Dynamics.