Model updating techniques are used to update dynamic finite element models of structures in light of experimental dynamic test data. While these techniques have been extensively developed and widely applied to structural dynamic finite element models, there is a need to develop and extend these techniques to vibroacoustic systems that involve an elastic structure enclosing a medium, like air. Examples of such systems are commonly found in aerospace, automotive, and some other applications. This paper develops a direct matrix updating formulation for vibroacoustic finite element models so as to allow the updating of the mass and stiffness matrix of both the structural as well the acoustic parts of the model by preserving their symmetry. A numerical example of a rectangular-box cavity backed by a flexible plate is presented to validate the updating method.
Direct Matrix Updating of Vibroacoustic Finite Element Models Using Modal Test Data
AIAA Journal ; 52 , 7 ; 1386-1392
01.07.2014
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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