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 synthesized 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.
Model updating and validation of the GARTEUR benchmark using resonance and antiresonance errors / W., D'Ambrogio; Fregolent, Annalisa. - STAMPA. - 1-5:(2002), pp. 1047-1055. (Intervento presentato al convegno Proceedings of the 2002 International Conference on Noise and Vibration Engineering, ISMA tenutosi a Leuven nel 16 September 2002 through 18 September 2002).
Model updating and validation of the GARTEUR benchmark using resonance and antiresonance errors
FREGOLENT, Annalisa
2002
Abstract
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 synthesized 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.