CONTROL OF CHAOS IN FERROELECTRIC SYSTEMS

It is well known that the structural phase transitions in ferroelectri c materials are connected with strong nonlinear properties. Therefore a series resonance circuit consisting of a linear coil and a nonlinear capacitor that is made of ferroelectric material can show all feature s of nonlinear dynamical systems: period-doubling, hysteresis and dete rministic chaotic behavior. In the chaotic region it is necessary to u se a method of controlling chaotic systems to snitch into periodic beh avior for fitting to a model equation. The used control method perturb ates the system only in a very small range. The advantage of the metho d is that one can get all needed parameters of control only by system measurements without using any kind of model.