Non-destructive analysis of defects and vibrations of a sheet of paper

Authors

  • K. Ragulskis
  • E. Kibirkštis
  • V. Miliūnas
  • V. Bivainis
  • L. Gegeckienė
  • L. Ragulskis

Keywords:

non-destructive testing, paper, bending vibrations, defect, eigenmode, eigenvalue, conjugate approximation, finite elements, conjugate smoothing, stroboscopic moiré, geometric moiré, image processing, intensity mapping, experimental results.

Abstract

The effect of the defects of the modulus of elasticity and of the density of the material to the eigenvalues of bending vibrations of a sheet of paper is analyzed. Representations of the effects of change of the modulus of elasticity and of the density of the material by intensity for the first eigenmodes are determined by using the procedure of conjugate smoothing.
A simple algorithm for processing of stroboscopic geometric moiré images is proposed. It enables to visualize the moiré fringes more clearly and thus to perform the interpretation of experimental results with higher precision.

Downloads

Published

2010-03-16

Issue

Vol. 65 No. 1 (2010)

Section

NON-DESTRUCTIVE TESTING AND DIAGNOSTIC METHODS

License

Copyright terms are indicated in the Republic of Lithuania Law on Copyright and Related Rights; Articles 4-37.
In the event the above Work is not accepted and is not published in the Publication or is withdrawn by Authors(s) before acceptance by the Publication; this guarantee form becomes null and void; and the submitted Work is not returned to the Author(s).