A Methodology For Identification Of Dynamic
Parameters In Assembled Aircraft Structures
Author(s)
S. Hernández, E. Menga, A. Baldomir, C. López, M. Cid
& S. Moledo
Abstract
Finite Element Models (FEM) are widely used in order to study and predict the
dynamic properties of structures. Comparing dynamic experimental data and
analytical results, respectively, of the real and modelled structure, shows that the
prediction of the dynamic response can be obtained with much more accuracy in
the case of a single component than in the case of assemblies.
Generally speaking, as the number of components in the assembly increases
the calculation quality declines because the connection mechanisms among
components are not represented sufficiently.
Specifically for aircrafts, it is quite common that Frequency Response
Functions (FRF) obtained via Ground Vibration Test (GVT) show a certain
degree of discrepancy from the FRF calculated with the FEM, particularly across
the sections where joining is discontinued.
When this happens it is necessary to tune up the values of the dynamic
parameters of the joints, to allow the numerical FRF to match the results of the
experimental FRF. From a modelling and computational point of view, these
types of joints can be seen as localized sources of stiffness and damping and can
be modelled as lumped spring/damper elements.
In this paper this is done by formulating an optimization problem. The
approach has been applied to a FEM that mimics the rear fuselage of a
commercial aircraft and the numerical results shows that the procedure is very
efficient and promising.
Keywords: aircraft design, assembled structures, ground vibration test, dynamic
analysis, optimization methods.
Keywords
Keywords: aircraft design, assembled structures, ground vibration test, dynamic
analysis, optimization methods.
Related Book
Other papers in this volume
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