Numerical evaluation of the flexural forced vibration of a cantilever beam having a transverse surface crack extending uniformly along the width of the beam was performed to relate the nonlinear resonances to the crack presence, location, and depth. To this end, the qualitative characteristics, namely phase portrait distortions, sub- and super-harmonic components in the Fourier spectrum, and curved shape of the modal line were considered. Furthermore, quantitative parameters, such as the eccentricity and the excursion of the orbit, and the harmonic amplitude in the spectrum were measured. Then, an identification procedure was proposed which was based on the intersection of constructed surfaces which allowed to identify the structural damage. The acceleration record of the beam tip was sufficient to detect the existence of the crack and to identify crack depth and site.

Cracked beam identification by numerically analysing the nonlinear behaviour of the harmonically forced response / Andreaus, Ugo; Baragatti, Paolo. - In: JOURNAL OF SOUND AND VIBRATION. - ISSN 0022-460X. - STAMPA. - 330(4):(2010), pp. 721-742. [10.1016/j.jsv.2010.08.032]

Cracked beam identification by numerically analysing the nonlinear behaviour of the harmonically forced response.

ANDREAUS, Ugo;BARAGATTI, PAOLO
2010

Abstract

Numerical evaluation of the flexural forced vibration of a cantilever beam having a transverse surface crack extending uniformly along the width of the beam was performed to relate the nonlinear resonances to the crack presence, location, and depth. To this end, the qualitative characteristics, namely phase portrait distortions, sub- and super-harmonic components in the Fourier spectrum, and curved shape of the modal line were considered. Furthermore, quantitative parameters, such as the eccentricity and the excursion of the orbit, and the harmonic amplitude in the spectrum were measured. Then, an identification procedure was proposed which was based on the intersection of constructed surfaces which allowed to identify the structural damage. The acceleration record of the beam tip was sufficient to detect the existence of the crack and to identify crack depth and site.
2010
damage identification; nonlinear vibration; cracked beam; numerical simulation
01 Pubblicazione su rivista::01a Articolo in rivista
Cracked beam identification by numerically analysing the nonlinear behaviour of the harmonically forced response / Andreaus, Ugo; Baragatti, Paolo. - In: JOURNAL OF SOUND AND VIBRATION. - ISSN 0022-460X. - STAMPA. - 330(4):(2010), pp. 721-742. [10.1016/j.jsv.2010.08.032]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/81060
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