3 CASE-STUDIES IN FINITE-ELEMENT MODEL UPDATING

This article summarizes the basic formulation of two well-established finite element model (FEM) updating techniques for improved dynamic an alysis, namely the response function method (RFM) and the inverse eige nsensitivity method (IESM). Emphasis is placed on the similarities in their mathematical formulation, numerical treatment, and on the unique ness of the resulting updated models. Three case studies that include welded L-plate specimens, a car exhaust system, and a highway bridge w ere examined in some detail and measured vibration data were used thro ughout the investigation. It was experimentally observed that signific ant dynamic behavior discrepancies existed between some of the nominal ly identical structures, a feature that makes the task of model updati ng even more difficult because no unequivocal reference data exist in this particular case. Although significant improvements were obtained in all cases where the updating of the FE model was possible, it was f ound that the success of the updated models depended very heavily on t he parameters used, such as the selection and number of the frequency points for RFM, and the selection of modes and the balancing of the se nsitivity matrix for IESM. Finally, the performance of the two methods was compared from general applicability, numerical stability, and com putational effort standpoints. (C) 1995 John Wiley & Sons, Inc.