2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/119523In the work a nonlinear Duffing oscillator is considered under impulse excitation with two ways of introduction of the random additive term simulating noise, - with help of amplitude modulation and modulation of period of impulses sequence. The scaling properties both in the Feigenbaum scenario and in the tricritical case are shown.14 pages, 8 figuresChaotic Dynamicstext