Complex Dynamics in Lorenz System Due to Time Delayed Feedbacks

In this paper,the effects of linear time delayed feedbacks derived from Lorenz equation are investigated.It has been found that the time delay as a control parameter affects the dynamics of the system under consideration and the delayed system may exhibit exceedingly complicated dynamic behaviors,including periodic,quasi-periodic,chaotic motions.Some new chaotic attractors are shown,for instance,a 3-scroll attractor similar to Chen's attractor and another very strange attractor like wormhole etc.