The interaction of plasma gas with the surrounding atmosphere in plasma arc cutting (PAC) has been investigated using high-speed Schlieren imaging. The time-series corresponding to the recorded intensity of each pixel have been post-processed using statistical analysis. Two different methods that highlight the time variation of the amplitude of the fluctuations in the density field have been compared: the windowed standard deviation and the GARCH approach. Whereas a mean-variance analysis can provide at most time-averaged results, GARCH can model the instantaneous variation of the luminous signal, thus providing new insights on the time evolution of the turbulence around the arc.

Statistical Analysis of High-Speed Schlieren Imaging in PAC

COLOMBO, VITTORIO;CONCETTI, ALESSIA;GHEDINI, EMANUELE;SANIBONDI, PAOLO;CANTORO, GIANMATTEO;
2011

Abstract

The interaction of plasma gas with the surrounding atmosphere in plasma arc cutting (PAC) has been investigated using high-speed Schlieren imaging. The time-series corresponding to the recorded intensity of each pixel have been post-processed using statistical analysis. Two different methods that highlight the time variation of the amplitude of the fluctuations in the density field have been compared: the windowed standard deviation and the GARCH approach. Whereas a mean-variance analysis can provide at most time-averaged results, GARCH can model the instantaneous variation of the luminous signal, thus providing new insights on the time evolution of the turbulence around the arc.
V. Colombo; A. Concetti; E. Ghedini; P. Sanibondi; G. Cantoro; F. Zinzani
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/105808
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