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Finding local non-linearities using error localization from model updating theory

A. Linderholt ; Thomas Abrahamsson (Institutionen för tillämpad mekanik, Dynamik)
30th IMAC, A Conference on Structural Dynamics, 2012; Jacksonville, FL; United States; 30 January 2012 through 2 February 2012 (2191-5644). Vol. 3 (2012), p. 323-334.
[Konferensbidrag, refereegranskat]

Within the aerospace industry, linear finite element models are traditionally used to describe the global structural dynamics of an aircraft. Ground vibration test data serve to facilitate the validation of models which are then used to characterize the aeroelastic behavior of the aircraft and to predict the responses due to dynamic loads. Thus, it is vital that the models contain the essential dynamics of the aircraft. Observed nonlinearities are judged to be local in nature whereas the main part of the structure behaves linearly under normal loading. In this work we focus on the identification of nonlinear effects and do that based on model updating theory. That includes methods for error localization with proper selection of candidate error parameters. The nonlinearities are treated as local modeling errors not considered in the linear system model. The error localization behavior is studied using synthetic test data from a simple system, known as the ECL Benchmark, with known nonlinear properties.

Nyckelord: Data informativeness , Error localization , Model updating , Non linear , Optimization , Parameter identifiability

Denna post skapades 2015-05-04.
CPL Pubid: 216264


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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Dynamik


Teknisk fysik

Chalmers infrastruktur