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Multi‐mode wave propagation in damaged stiffened panels
Author(s) -
Huang T. L.,
Ichchou M. N.,
Bareille O. A.
Publication year - 2012
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.451
Subject(s) - wave propagation , modal , acoustics , wavenumber , structural engineering , range (aeronautics) , mode (computer interface) , normal mode , engineering , physics , computer science , materials science , optics , vibration , aerospace engineering , operating system , polymer chemistry
SUMMARY This paper addresses the issue of defect signature in stiffened panels at medium frequencies. With a tool for estimating the wave propagation characteristics of two‐dimensional structures by k ‐space analysis, namely the Inhomogeneous Wave Correlation, the estimation of wavenumbers for waves propagating in stiffened panels can be achieved. Here, the method is employed with the sparse‐simulated normal displacements of a set of stiffened panels. New insights into the use of their k ‐space behavior are hence highlighted. The guided wave behavior, which starts to appear at medium frequencies, can be extracted and treated in order to detect the presence of damage through a multi‐modal wave propagation analysis in stiffened panels. The sensitivity of guided waves to defects in stiffened panels at medium frequency range is studied numerically, and the phenomena observed are explained with an energy diffusion analysis of waves propagating in stiffened panels. Copyright © 2011 John Wiley & Sons, Ltd.