Identification of stiffness properties of composite tubes from dynamic tests

The identification of the stiffness properties of typical laminated composi te tubes from dynamic tests is presented. Unknown coefficients are identifi ed by a technique of model updating. The formulation is based on the minimi zation of the eigensolution residuals (sensitivity method). Errors of gener alized masses are considered. The technique allows for the simultaneous ide ntification of several properties from a single test. Stiffness properties of extension, bending/twisting and transverse shear are identified. Importa nt points of the model updating of tubes in dynamics are addressed: potenti al energy evaluation, placement of sensors and the problem of multiple eige nvalues. Results obtained by numerical simulation show the efficiency of th e proposed method.