Application of model updating techniques in dynamics for the identification of elastic constants of composite materials

This work consists of the identification of the stiffness properties of com posite materials from dynamic tests. Unknown coefficients are identified by a technique of model updating. The formulation used (modal approach) is ba sed on the minimization of the eigensolution residuals (sensitivity method) . This technique allows the simultaneous identification of several properti es from a single test. Stiffness properties of extension, bending, twisting and transverse shear have been identified. A discussion of the different i dentification approaches of elastic constants of composite materials from d ynamic tests has been presented. Important points of the model updating in dynamics have been addressed: generalized mass errors, placement of sensors and approximate reanalysis of eigensolutions. Results obtained by numerica l simulations show the efficiency of the proposed methodology. (C) 1999 Els evier Science Ltd. All rights reserved.