The exploitation of nonlinearities in the eld of damage detection is a promising direction towards robust and reliable monitoring systems for engineering applications. In this perspective, the concept of nonlinear normal mode (NNM) is a natural candidate for extending the knowledge already established in the linear framework and for developing new approaches. A clamped-clamped beam with localized cross-sectional reductions across the beam span is considered. The problem is first analytically tackled via the method of multiple scales for computing the NNMs and the backbone curves. The latter describes the dependence of the resonance frequencies on the oscillation amplitude and are governed by the so-called effective nonlinearity coefficient for each mode. Subsequently, an experimental campaign is carried out considering an undamaged and a damaged beam to validate the analytical results. The effective nonlinearity coeffcient is shown to exhibit a sensitivity to damage higher than that exhibited by the linear natural frequencies, whereas the backbones associated to each mode reveal an interesting dependence on the sti ness reduction and damage location.

Nonlinear Normal Modes For Damage Detection: Theoretical Concepts And Preliminary Experimental Validation / Carboni, Biagio; Guruva, Sawan Kumar; Catarci, Stefano; Quaranta, Giuseppe; Lacarbonara, Walter. - (2022).

Nonlinear Normal Modes For Damage Detection: Theoretical Concepts And Preliminary Experimental Validation

Biagio Carboni
Primo
;
Sawan Kumar Guruva
Secondo
;
Stefano Catarci;Giuseppe Quaranta;Walter Lacarbonara
2022

Abstract

The exploitation of nonlinearities in the eld of damage detection is a promising direction towards robust and reliable monitoring systems for engineering applications. In this perspective, the concept of nonlinear normal mode (NNM) is a natural candidate for extending the knowledge already established in the linear framework and for developing new approaches. A clamped-clamped beam with localized cross-sectional reductions across the beam span is considered. The problem is first analytically tackled via the method of multiple scales for computing the NNMs and the backbone curves. The latter describes the dependence of the resonance frequencies on the oscillation amplitude and are governed by the so-called effective nonlinearity coefficient for each mode. Subsequently, an experimental campaign is carried out considering an undamaged and a damaged beam to validate the analytical results. The effective nonlinearity coeffcient is shown to exhibit a sensitivity to damage higher than that exhibited by the linear natural frequencies, whereas the backbones associated to each mode reveal an interesting dependence on the sti ness reduction and damage location.
2022
International Conference Proceedings Series: The 8th World Conference On Structural Control And Monitoring (8WCSCM)
backbone curves; damage detection; nonlinear normal modes; method of multiple scales
02 Pubblicazione su volume::02a Capitolo o Articolo
Nonlinear Normal Modes For Damage Detection: Theoretical Concepts And Preliminary Experimental Validation / Carboni, Biagio; Guruva, Sawan Kumar; Catarci, Stefano; Quaranta, Giuseppe; Lacarbonara, Walter. - (2022).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1669758
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