This work deals with a two-dimensional automatic control system containing a single nonlinear hysteretic element in the general form. The conditions sufficient for the existence of at least two limit cycles in the system are presented. To prove the existence of cycles, three closed contours embedded into each other are constructed on the phase manifold by “sewing” together pieces of the level lines of various Lyapunov functions. System trajectories cross the inner contour “from outside inwards” and the middle contour “from inside outwards.” The outer contour is crossed by system trajectories “from outside inwards.” The existence of these contours proves the presence of at least two limit cycles in the system. This paper is a continuation of our earlier published work “Conditions for the Global Stability of a Single System with Hysteresis Nonlinearity,” in which the conditions of global stability in this system are formulated.
Original languageEnglish
Pages (from-to)237-243
JournalVestnik St. Petersburg University: Mathematics
Volume51
Issue number3
StatePublished - 31 Jul 2018

    Scopus subject areas

  • Mathematics(all)

    Research areas

  • limit cycles, hysteresis nonlinearity, hysteretic system, Second Lyapunov method

ID: 38793892