Kolebatel'nye resheniya obyknovennogo differentsial'nogo uravneniya vtorogo poryadka s trekhpozitsionnym gisterezisnym rele bez vykhoda v zony nasyshcheniya

A second-order ordinary differential equation with an essential nonlinearity and an external perturbation in the form of a continuous periodic function is studied. Nonlinearity is given by a symmetrical relay characteristic with hysteresis, dead zone, and saturation zones. The traversal of the characteristic without entering the saturation zones is considered for some finite time and time commensurate with the period of the perturbation function. Conditions for the existence of an oscillating solution with a closed phase trajectory and four switching points during one traversal of the characteristic are obtained. Existence theorems for periodic solutions, including solutions with a symmetric trajectory, are proved. A numerical example is given.