Abstract
Failure in structure and machine component subjected to vibration generally takes place at natural frequencies at which amplitude of vibration becomes quite high. For failure analysis it is therefore important to understand the behaviour of component at natural frequencies. In this paper study of out-of-plane vibrations in square plate and tweeder by digital speckle pattern interferometry (DSPI) is studied and presented. For analysis of the DSPI fringes, speckle noise has to be removed. Removal of speckle noise in the speckle interferograms depends mainly upon texture and number of speckles present in the speckle interferograms. Our recent investigations show that a filtering scheme based on combination of average and Symlet wavelet filter and combination of Wiener and Symlet wavelet filter is effective in removing the speckle noise present in the speckle interferograms of vibrating square plate made of aluminum and tweeder surface made of diffused foil respectively. Experimental results are presented.
