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Abstract In this paper, we are concerned with the problem of periodic solutions for a class of second order periodically forced nonlinear damped Duffing equations with a discontinuity line x ′ ′ + c x ′ + g (x) = e (t) , where g (x) is discontinuous and e ∈ C 0 (R , R) is T -periodic. We first show that the periodic solutions can only be harmonic and subharmonic solutions. Secondly, note that g (x) is an abstract function, so the explicit solutions cannot be computed and then known theory cannot be applied directly. Therefore, we give geometric properties of solutions for the discontinuous forced damped Duffing equation. Then by the Poincaré–Bohl theorem we investigate the existence and uniqueness of crossing harmonic and subharmonic solutions of the equation. [ABSTRACT FROM AUTHOR]

In this paper, we consider a class of flux controlled memristive circuits with a piecewise linear memristor (i.e. the characteristic curve of the memristor is given by a piecewise linear function). The mathematical model is described by a discontinuous planar piecewise smooth differential system, which is defined on three zones separated by two parallel straight lines (called as discontinuity lines in discontinuous differential systems). We first investigate the stability of equilibrium points and the existence and uniqueness of a crossing limit cycle for the memristor-based circuit under self-excited oscillation. We then analyze the existence of periodic orbits of forced nonlinear oscillation for the memristive circuit with an external exciting source. Finally, we give numerical simulations to show good matches between our theoretical and simulation results. [ABSTRACT FROM AUTHOR]

In this paper, we investigate the existence of discontinuous periodic solutions for a class of Liénard systems with state impulses, whose solutions are interrupted by abrupt changes of state. By employing Poincaré mapping method, a criterion for the existence of at least one discontinuous periodic solution in the impulsive Liénard systems is established. Finally, we give an example to illustrate the effectiveness of our result, and the corresponding numerical simulation is presented to show that there is a good agreement between our theoretical result with the computer numerical analysis. [ABSTRACT FROM AUTHOR]

In this paper, we investigate the existence problem of periodic orbits for a planar Liénard system, whose solution mappings are interrupted by abrupt changes of state. We first present the geometrical properties of solutions for the planar Liénard system with state impulses, then by using Bendixson theorem of impulsive differential equations and successor function method, several new criteria on the closed orbits and discontinuous periodic orbits are established in the impulsive Liénard system. [ABSTRACT FROM AUTHOR]