Effect of defects on the vibrations of a paper in elements of packages

The effect of stiffness and mass defects on eigenvalues of bending vibrations of paper is analyzed in the paper. The histograms of the effect of change of stiffness and mass of finite elements for the first eigenmodes are determined. Experimental procedure based on the method of projection moire was used to determine the eigenmodes of the standing waves of the paper excited with vibrations for the paper with and without defects. The proposed method of optical diagnostics of defects is applicable in the systems of automatic control of packaging materialsKauno technologijos universitetasVytauto Didžiojo universiteta