Identification of Equivalent Elastic and Damping Parameters for Roll Core Sandwich Panels of Railway Vehicles

摘要

Since composite materials such as roll core sandwich panels have high specific strength, high structural efficiency and durability, in recent years they have been used in many structural applications of the railway vehicles. It is therefore very important for the design and the structural analysis to make clear the dynamic properties of the roll core sandwich panels. Especially, elastic and damping parameters are essential for dynamic analyses. On the other hand, an inverse analysis method has already been proosed by one of the authors to identify equivalent parameters of composite materials using the FEM eigenvalue analysis. The purpose of this paper is to apply the proposed method to a roll core sandwich panel, and to identify the equivalent elastic and damping parameters of the panel. First, by applying the experimental modal analysis technique to a roll core sandwich square panel, natural frequencies and modal damping ratios of the panel are obtained. Next, from the natural frequencies and modal damping ratios, the equivalent elastic and damping parameters of the panel are identified numerically.