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In order to increase the security of single chaotic system, this paper proposed a new image encryption algorithm based on Chen chaotic system, cellular automaton and DNA. Firstly, the 3-dimension Chen chaotic system generated a pseudo random sequence. Secondly, based on the transformed sequence, it completed the DNA dynamic encoding on plain-text image and cellular automation. Finally, it divided...
In this paper, a derivative Lorenz chaotic system is considered and the stability of equilibrium points and the existence of Hopf bifurcation are investigated by center manifold theorem and normal form theory. Besides, we designed a washout controller such that the derivative Lorenz chaotic system undergoes a controllable Hopf bifurcation. By the calculation of the first Lyapunov coefficient and adjust...
In this paper, generation of a class of multidirectional saturated chaotic attractors is investigated based on coupled Chua's circuits. The Caputo derivative definition is employed to describe the fractional-order multi-scroll dynamic systems, and a fractional-order chaotic system with 6×6×6×6×6×6 and 9×9×9×9×9×9 grid scroll chaotic attractors are obtained. Simulation results are presented to show...
The carbon-monoxide utilization ratio (CMUR) is a significant factor for the energy consumption in the blast furnace (BF). CMUR cannot be well controlled on the spot due to the low predication in the previous research. In this paper, a chaotic prediction method is presented to forecast the variation tendency of CMUR. Firstly, CMUR time series sample data are acquired from two representative BFs as...
The Buck converter exhibits the chaotic phenomenon because of the high frequency switching action, and this nonlinear phenomenon leads to the unreliable working performance. Consequently, in this paper, on basis of a damper thought a delayed differential feedback method is proposed to stabilize the Buck converter from the chaotic state to the various periodic orbits via adjusting the feedback coefficient...
PM2.5 is difficult to accurately forecast due to the influence of multiple meteorological and pollutant variables in the complex nonlinear dynamic atmosphere system. In this paper, an Elman neural network prediction method based on chaos theory is put forward for the problem. Firstly, the chaotic characteristics of the concentration of the PM2.5 are analyzed and verified from the correlation dimension,...
In this paper, the chaotic motion of micro-cantilever tip in AFM is considered. A disturbance observer based control approach is proposed. The proposed control approach is composed of state observer, disturbance observer and baseline controller. It is also relatively easy to be realized based on the measurable control input and system output signal. The developed control approach is able to suppress...
The chaos and its control by nonfeedback method in tethered satellite system are investigated in this paper. The chaos dynamical behavior of the system is judged by the sign of the top Lyapunov exponent. The Khasminskii's spherical coordinate formulation and the extension of Wedig's algorithm are used to compute the top Lyapunov exponent. It is shown that, the chaos can be suppressed by exerting a...
The synchronization of uncertain chaotic neural networks with time delays was studied in this paper. Based on the sliding mode control (SMC) approach, some sufficient conditions for synchronization of the two coupled networks are obtained. Finally, an example and its simulation are given to illustrate the effectiveness of our results.
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