Results obtained by mimimising natural frequency and antiresonance errors of a beam model

In this paper an extension of the antiresonance-based model updating method that - by estimating antiresonances of unmeasured point FRFs - allows the use of previously identified modal data, is applied to the finite element model updating of the GARTEUR benchmark. The various steps of the process (modelling assumptions, selection of correction parameters, sensitivity analysis, model updating and validation) are carefully described and discussed. Unmeasured FRFs are synthesised using truncated modal expansion. Although modal truncation may seriously affect antiresonance location, this effect can be avoided by using appropriate low- and high-frequency residuals accounting for the contribution of truncated modes. Being unavailable for unmeasured FRFs, such residuals are estimated using rigid body and upper analytical modes.