Direct chaos towards low-period motion based on notch filter feedback control

A method is presented here to direct the chaotic motion towards desired low -period. motion by using notch filter output feedback control in lots of ch aotic systems. The mathematic and physical mechanism of this method is also discussed based on Melnikov Method which is perturbation criteria for chao s. The control results of some typical chaotic systems are given, which has been shown that the method of controlling chaos can be easily and practica lly realized in physical systems. The method, furthermore, can be applied t o achieve control for hyper-chaotic systems.