The dynamics of a parabolic arch is studied in its undamaged and damaged states. The damage consists of a notch that reduces the height of the cross section at a given abscissa. A damage identification technique, based on the minimization of an objective function measuring the differences between numerical and experimental variations of natural frequencies for undamaged and damaged states, is used. The uniqueness of the solution in different damage configurations is investigated using pseudo-experimental data and the reliability of the identification procedure is assessed. The identification procedure is then applied to an experimental case, where frequencies are obtained by impulsive tests on a prototype arch. The minimum number of experimental data needed to identify damage parameters is defined and the sensitivity of the identification algorithm to different possible choices of sets of data is analyzed.

Numerical and experimental detection of concentrated damage in a parabolic arch by measured frequency variations / Pau, A.; Greco, A.; Vestroni, F.. - In: JOURNAL OF VIBRATION AND CONTROL. - ISSN 1077-5463. - STAMPA. - 17:4(2011), pp. 605-614. [10.1177/1077546310362861]

Numerical and experimental detection of concentrated damage in a parabolic arch by measured frequency variations

A. Pau;F. Vestroni
2011

Abstract

The dynamics of a parabolic arch is studied in its undamaged and damaged states. The damage consists of a notch that reduces the height of the cross section at a given abscissa. A damage identification technique, based on the minimization of an objective function measuring the differences between numerical and experimental variations of natural frequencies for undamaged and damaged states, is used. The uniqueness of the solution in different damage configurations is investigated using pseudo-experimental data and the reliability of the identification procedure is assessed. The identification procedure is then applied to an experimental case, where frequencies are obtained by impulsive tests on a prototype arch. The minimum number of experimental data needed to identify damage parameters is defined and the sensitivity of the identification algorithm to different possible choices of sets of data is analyzed.
2011
inverse problems; arch dynamics; damage identification
01 Pubblicazione su rivista::01a Articolo in rivista
Numerical and experimental detection of concentrated damage in a parabolic arch by measured frequency variations / Pau, A.; Greco, A.; Vestroni, F.. - In: JOURNAL OF VIBRATION AND CONTROL. - ISSN 1077-5463. - STAMPA. - 17:4(2011), pp. 605-614. [10.1177/1077546310362861]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/138511
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