Rheological SLS model. Dynamic parameters of the mechanical systems with viscous damping. Part 1: amplitude factor - Drăgan, Nicușor (Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering, 2017)