Salas, Alvaro H. S.; Cieza Altamirano, Gilder; Sánchez-Chero, Manuel(HindawiCO, 2022-07-11)
In this paper, we generalize He’s frequency approach for solving the damped Duffing equation by introducing a time varying amplitude. We also solve this equation by means of the homotopy method and the Lindstedt–Poincaré ...