The power spectrum S(f) of several fluctuating physical variables V(t) is 1/f-like, varying as f^γ (0.5 ≤ γ ≤ 1.5) over different orders of magnitude of frequency. As is well-known in the literature, loudness fluctuations in music and speech exhibit 1/f power spectra. The authors observe that even in quasi-brittle materials, like rocks, concrete, and masonry, there is a source of 1/f noise regarding Acoustic Emissions (AE) from fracture phenomena. The results from laboratory tests on specimens of rock and concrete, and from in-situ monitoring of historical buildings of the Italian architectural heritage, are considered. The obtained AE data are represented in a log-log plot of spectral density versus frequency, showing a 1/f noise behaviour of pressure waves in structural elements subjected to different loading conditions. The question about the universality of 1/f noise will be also discussed.

Fluctuations of acoustic emission frequencies in damaging structures / Accornero, Federico; Lacidogna, Giuseppe; MANUELLO BERTETTO, AMEDEO DOMENICO BERNARDO; Carpinteri, Alberto. - STAMPA. - (2016), pp. 1-2. (Intervento presentato al convegno 17th International Conference on Experimental Mechanics (ICEM 17) July 3-7, 2016, Rhodes, Greece tenutosi a Rhodes, Greece nel July 3-7, 2016).

Fluctuations of acoustic emission frequencies in damaging structures

ACCORNERO, FEDERICO;LACIDOGNA, GIUSEPPE;MANUELLO BERTETTO, AMEDEO DOMENICO BERNARDO;CARPINTERI, ALBERTO
2016

Abstract

The power spectrum S(f) of several fluctuating physical variables V(t) is 1/f-like, varying as f^γ (0.5 ≤ γ ≤ 1.5) over different orders of magnitude of frequency. As is well-known in the literature, loudness fluctuations in music and speech exhibit 1/f power spectra. The authors observe that even in quasi-brittle materials, like rocks, concrete, and masonry, there is a source of 1/f noise regarding Acoustic Emissions (AE) from fracture phenomena. The results from laboratory tests on specimens of rock and concrete, and from in-situ monitoring of historical buildings of the Italian architectural heritage, are considered. The obtained AE data are represented in a log-log plot of spectral density versus frequency, showing a 1/f noise behaviour of pressure waves in structural elements subjected to different loading conditions. The question about the universality of 1/f noise will be also discussed.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2646193
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