UNIQUENESS ASPECTS OF MODEL-UPDATING PROCEDURES

Application of model-updating techniques to obtain improved finite-element models for dynamic behavior computations is often associated with the critical observation that model-update techniques can yield completely different models. In the past, this has been a reason for avoiding the use of such procedures. In order to obtain more insight into this phenomenon, a theoretical study about the uniqueness aspects of model update results is presented. A first problem is treated in which the equivalence of stiffness and mass modifications is evaluated. In a second step, the existence of equivalent finite-element models is investigated. As a result, practical conclusions about the quality of model-update results will be drawn. © 1990 American Institute of Aeronautics and Astronautics, Inc., All rights reserved.