A technique to directly update nonconservative Finite Element dynamic models from input-output experimental data is developed. The method totally circumvents the modal identification process and thus is advantageous in eliminating the adverse effects of a host of identification errors. In addition, the procedure requires neither the matching, or pairing, of experimental and analytical data sets nor the use of the discrepancy between values of the two sets, In general, the theory allows any type of force input(s) and complete updating of the mass, damping and stiffness matrices is accomplished using only the response measured at two time instants. However, to avoid the simultaneous measurement of displacements, velocities and accelerations, harmonic excitation is recommended at this stage. The system's spatial matrices are modeled using the Finite Element model submatrices. Damping mechanisms can be modeled as viscous, structural, a combination of the two, or others. Several simulated experiments are presented in support of the proposed approach.
展开▼
