Multi-mode wave propagation in ribbed plates: Part I, wavenumber-space characteristics

• Published in: International journal of solids and structures Vol. 45; no. 5; pp. 1179 - 1195
• Main Authors: Ichchou, M.N., Berthaut, J., Collet, M.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-03-2008
• Subjects: k-Space; Medium frequencies; Orthotropic structures; Ribbed structures; Vibration; Wave propagation; Orthotropic structures; Wave propagation; Vibration; Ribbed structures; Medium frequencies; k-Space
• ISSN: 0020-7683; 1879-2146
• DOI: 10.1016/j.ijsolstr.2007.09.032

This paper addresses the issue of energy propagation features in ribbed panels over a wide frequency range. First, a tool for estimating the wave propagation characteristics of one- and two-dimensional structures by
k-space analysis is presented. This tool uses a concept of Inhomogeneous Wave Correlation with sparse measured or extracted data, and leads to the estimation of
θ-dependent wavenumbers. Here, the method is employed with the sparse simulated and measured normal velocities of a set of ribbed panels and new insights into their
k-space behavior are highlighted. Behavior is essentially characterized at low frequencies by structural orthotropy. Comparisons with homogenized data show very good agreement. At higher frequencies, a new behavior pattern is observed and explained both numerically and experimentally. This is a multi-modal waveguide type of propagation in a direction parallel to the ribs.