Finite element model updating

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This provides a richer set of test data to serve as reference for updating element properties that are common in all configurations.

Such properties can be, for example, the joint stiffness or material properties.

The model updating method uses the discrepancy between FEA results and test, and sensitivities to determine a change in the update parameters that will reduce the discrepancy.

This is most efficient if superelements are used to model the parts that do not change.

resonance frequency or mass) as a result of modifying a parameter value.

The coefficients obtained for all combinations of responses and parameters are stored in a sensitivity matrix.

There are many different methods of finite element model updating.

FEMtools uses well-proven iterative, parametric, modal and FRF-based updating algorithms using sensitivity coefficients and weighting values (Bayesian estimation).

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