Time series analysis based study of a mass-spring-like oscillation and detachment of a metal pendant droplet
Jeromen, Andrej, 1975- ; Govekar, Edvard
The subject of this study is the vertical mass-spring-like oscillation of a pendant droplet and its resonant detachment, which was experimentally observed in the process of laser droplet generation ...from a metal wire. The process was characterized by various time series, which were generated from a sequence of infrared intensity images of the process. Following a visual inspection of pendant droplet images and an analysis of a wavelet based time-frequency map of the dropletʼs vertical displacement time series, the pendant dropletʼs oscillation is described by a time-variable mass-spring system. Based on the characteristics of the time-frequency map, the resonant nature of the pendant droplet detachment was demonstrated. Additionally, an algebraic expression was formulated, which can be used to predict the detached dropletʼs diameter as a function of the laser pulse frequency.
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