Numerical and experimental approach for identifying elastic parameters in sandwich plates

Issue title: COBEM 2001

Article type: Research Article

Authors: Bastos, Sergio Ferreira | Borges, Lavinia | Rochinha, Fernando A.

Affiliations: SENAI -- CETIQT, Rua Dr. Manoel Cotrim 195, Riachuelo, Rio de Janeiro, RJ, Brazil. E-mail: sbastos@cetiqt.senai.br | LMS -- Solid Mechanics Laboratory, Mechanical Engineering Department, Federal University of Rio de Janeiro, C.P. 68503, Rio de Janeiro, RJ, Brazil. E-mail: lavinia@ufrj.br; faro@serv.com.ufrj.br

Note: [] Corresponding author

Abstract: This article deals with the identification of elastic parameters (engineering constants) in sandwich honeycomb orthotropic rectangular plates. A non-destructive method is introduced to identify the elastic parameters through the experimental measurements of natural frequencies of a plate undergoing free vibrations. Four elastic constant are identified. The estimation of the elastic parameter problem is solved by minimizing the differences between the measured and the calculated natural frequencies. The numerical method to calculate the natural frequencies involves the formulation of Rayleigh-Ritz using a series of characteristic orthogonal polynomials to properly model the free edge boundary conditions. The analysis of the results indicates the efficiency of the method.

Keywords: identification of parameters, sandwich plates, optimization

Journal: Shock and Vibration, vol. 9, no. 4-5, pp. 193-201, 2002