In this work we consider a general class of 2-dimensional hybrid systems. Assuming that the system possesses an attracting equilibrium point, we show that, when periodically driven with a square-wave pulse, the system possesses a periodic orbit which may undergo smooth and nonsmooth grazing bifurcations. We perform a semi-rigorous study of the existence of periodic orbits for a particular model consisting of a leaky integrate-and fire model with a dynamic threshold. We use the stroboscopic map, which in this context is a 2-dimensional piecewise-smooth discontinuous map. For some parameter values we are able to show that the map is a quasi-contraction possessing a (locally) unique maximin periodic orbit. We complement our analysis using advanced numerical techniques to provide a complete portrait of the dynamics as parameters are varied. We find that for some regions of the parameter space the model undergoes a cascade of gluing bifurcations, while for others the model shows multistability between orbits of different periods.
|Journal||Communications in Nonlinear Science and Numerical Simulation|
|Publication status||Published - 2019|
- Hybrid systems
- Piecewise smooth 2d maps
Granados, A., & Huguet, G. (2019). Gluing and grazing bifurcations in periodically forced 2-dimensional integrate-and-fire models. Communications in Nonlinear Science and Numerical Simulation, 70, 48-73. https://doi.org/10.1016/j.cnsns.2018.09.006