Time series analysis based study of a mass-spring-like oscillation and detachment of a metal pendant dropletJeromen, Andrej (Avtor) Govekar, Edvard (Avtor) time seriestime-frequency analysispendant dropletmass-spring systemsdroplet detachmentThe 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.20162018-12-12 14:12:30Članek v reviji105756sl