In the paper, we study effects of scale-free (SF) topology on dynamical synchronization and control in coupled map lattices (CML). Our strategy is to apply three feedback control methods, including constant feedback and two types of time-delayed feedback, to a small fraction of network nodes to reach desired synchronous state. Two controlled bifurcation diagrams verses feedback strength are obtained respectively. It is found that the value of critical feedback strength γc for the first time-delayed feedback control is increased linearly as ε is increased linearly. The CML with SF loses synchronization and intermittency occurs if γ > γc. Numerical examples are presented to demonstrate all results.
Currently, when research the fault detection and diagnosis in the mechanical and electrical systems , with the most is extracted vibration signal analysis and processing, but the vibration signal could been interfered easily by outside environment, this is likely to lead to signal distortion and cannot detect the fault. This paper proposed a fault detection method of mechanical and electrical system based on a rotation signal which collected by rotor, and introduced the rotation signal extraction method and FFT analysis theory. Experiments show that the method can capture the rotor turn signals accurately, and ensure the accuracy of FFT analysis base on this signal. From the results of PC processing, we can see, this method can detect common mechanical system failure effectively, and overcome the shortcomings of the vibration failure analysis.
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