By means of PZT pickups, we experimentally measured the natural frequencies of an aluminum thin-walled open profile under centered compression, and investigated the effects of end warping constraints on free vibration and buckling loads. The specimen was mounted on a MTS testing machine, controlling the axial displacement imposed to a beam end by the hydraulic jack. The free vibration frequencies were detected for different values of the compressive force. The experimental results are compared to those provided by an in-house numerical code, which investigates on the elastic stability of thin-walled beams in a dynamic setting. Indeed, the code is able to follow the paths of natural frequencies versus the applied load, accounting for the effect of cross-sectional warping on both natural frequencies and buckling loads. The experimental results show that piezoelectric pickups, like the disk adopted, can be efficiently used for the experimental modal analysis of engineering structures.

PZT experimental detection of natural frequencies for compressed thin-walled beams / Lofrano, Egidio; Carpinteri, Alberto; Malvano, Riccardo; Manuello, Amedeo; Piana, Gianfranco; Ruta, Giuseppe. - STAMPA. - 1:(2015), pp. 103-112. (Intervento presentato al convegno Society for Experimental Mechanics Series tenutosi a Orange County, USA nel 8/6-11/6 2015).

PZT experimental detection of natural frequencies for compressed thin-walled beams

LOFRANO, EGIDIO;RUTA, Giuseppe
2015

Abstract

By means of PZT pickups, we experimentally measured the natural frequencies of an aluminum thin-walled open profile under centered compression, and investigated the effects of end warping constraints on free vibration and buckling loads. The specimen was mounted on a MTS testing machine, controlling the axial displacement imposed to a beam end by the hydraulic jack. The free vibration frequencies were detected for different values of the compressive force. The experimental results are compared to those provided by an in-house numerical code, which investigates on the elastic stability of thin-walled beams in a dynamic setting. Indeed, the code is able to follow the paths of natural frequencies versus the applied load, accounting for the effect of cross-sectional warping on both natural frequencies and buckling loads. The experimental results show that piezoelectric pickups, like the disk adopted, can be efficiently used for the experimental modal analysis of engineering structures.
2015
Society for Experimental Mechanics Series
Natural frequencies, PZT sensors, Thin-walled beams, Warping constraints, Buckling, Numerical simulations
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
PZT experimental detection of natural frequencies for compressed thin-walled beams / Lofrano, Egidio; Carpinteri, Alberto; Malvano, Riccardo; Manuello, Amedeo; Piana, Gianfranco; Ruta, Giuseppe. - STAMPA. - 1:(2015), pp. 103-112. (Intervento presentato al convegno Society for Experimental Mechanics Series tenutosi a Orange County, USA nel 8/6-11/6 2015).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/872955
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