Selective sensitive finite element model updating: an improved approach

SUMMARY This paper discusses the realization of dynamic excitations that are used to complete finite element model updating, based on the selective sensitivity approach. It is explained how structures with many DOFs respond in desired parameter (in-) sensitive output patterns and how such patterns can be achieved without substantial previous theoretical knowledge. The excitation of selective sensitive response patterns has been defined in the literature as the fundamental requirement to perform parameter (in-) sensitive model updating. Up to now, the practical generation of selective sensitive response patterns on existing and possible complex structures has been questionable. Consequently, in this paper, a major effort is dedicated to overcome this problem and to provide an excitation approach that can be realized in practice. In a test example, the system parameters of a continuous steel beam are identified, taking into account the minimum excitation configuration given by four available electro dynamic shakers. The realization of different and independent experimental configurations is shown. Copyright © 2014 John Wiley & Sons, Ltd.

[1]  Y. Ben-Haim,et al.  Model Order Reduction by Selective Sensitivity , 1997 .

[2]  Sara Casciati,et al.  Model Order Reduction vs. Structural Monitoring , 2012 .

[3]  Christian Bucher,et al.  System identification based on selective sensitivity analysis: A case-study , 2013 .

[4]  Christian Bucher,et al.  On model updating of existing structures utilizing measured dynamic responses , 2005 .

[5]  Pietro Salvini,et al.  Regularisation techniques for dynamic model updating using input residual , 1996 .

[6]  Yakov Ben-Haim,et al.  Updating linear elastic models with modal selective sensitivity , 1995 .

[7]  John E. Mottershead,et al.  Finite Element Model Updating in Structural Dynamics , 1995 .

[8]  Łukasz Jankowski,et al.  Experimental study of the substructure isolation method for local health monitoring , 2012 .

[9]  Christian Bucher,et al.  Local finite element model updating with forced vibration measurements , 2014 .

[10]  Heung-Fai Lam,et al.  Optimal sensor configuration of a typical transmission tower for the purpose of structural model updating , 2011 .

[11]  Sara Casciati,et al.  Stiffness identification and damage localization via differential evolution algorithms , 2008 .

[12]  Hans Günther Natke,et al.  Einführung in Theorie und Praxis der Zeitreihen- und Modalanalyse , 1983 .

[13]  Thomas M. Murray,et al.  Use of a force plate versus armature accelerometer for measuring frequency response functions , 2011 .

[14]  Alex H. Barbat,et al.  Predictive Control of Structures , 1987 .

[15]  M. Friswell,et al.  Finite–element model updating using experimental test data: parametrization and regularization , 2001, Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[16]  Uwe Prells,et al.  Selective sensitivity in the frequency domain--I. Theory , 1993 .

[17]  Yakov Ben-Haim.  Adaptive diagnosis of faults in elastic structures by static displacement measurement: The method of selective sensitivity , 1992 .

[18]  G. Lang,et al.  Understanding the physics of electrodynamic shaker performance , 2001 .

[19]  Sara Casciati,et al.  Structural damage detection and localization by response change diagnosis , 2004 .

[20]  Uwe Prells,et al.  Selective sensitivity in the frequency domain--II. Applications , 1993 .