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Experimental methodology to assess the dynamic equivalent stiffness properties of elliptical orthotropic plates

Journal Contribution - Journal Article

This paper deals with the dynamic characterisation of plate structures with elliptical or- thotropic stiffness properties, using an equivalent thin plate theory using a wave fitting approach. The method consists in projecting the experimentally determined transverse dis- placement field of a plate on an analytical Green’s function of an elliptical orthotropic plate based on Hankel’s functions. The error between the projected and measured fields is then minimized, varying the characteristics of the function until an optimal fit is reached. The thus obtained characteristics are the two flexural rigidities defining the elliptical or- thotropy of the plate, and the orthotropy angle. This fitting procedure is applied at each frequency, enabling the determination of frequency dependent dynamic material proper- ties. The method is applied to a honeycomb sandwich panel to validate the proposed fit- ting approach. The identified flexural rigidities are compared to the estimations obtained by means of an analytical model and the IWC (Inhomogeneous Wave Correlation) method assuming three different type of plate characteristics (anisotropic, orthotropic and ellipti- cal orthotropic). For the elliptical orthotropic assumption, consistent results are observed between the methods and the model over a large frequency range (from 1 to 50 kHz).
Journal: Journal of Sound and Vibration
ISSN: 0022-460X
Volume: 495
Publication year:2021
BOF-keylabel:yes
IOF-keylabel:yes
BOF-publication weight:1
CSS-citation score:2
Authors:International
Authors from:Higher Education
Accessibility:Open