Abstract
An innovative bifurcation control method by using a weakly fractional-order \(PI^{\lambda } D^{\mu }\) feedback controller is proposed to eliminate the stochastic jump in the forced response for a bounded noise excited Duffing oscillator. The averaged Itô equations of amplitude modulation and phase difference are derived via stochastic averaging method, from which the reduced Fokker–Planck–Kolmogorov equation is established and solved numerically to obtain the stationary probability density of amplitude. An efficient scheme with high accuracy for simulating the fractional integral and fractional derivative is then explored. By examining the stationary probability density of amplitude of the uncontrolled and controlled systems, the fractional-order \(PI^{\lambda }D^{\mu }\) feedback controller has been demonstrated capable of eliminating the stochastic jump and alleviating the amplitude peak of primary resonance effectively, particularly for the case that the integer-order PID controller fails to perform and even leads to the unstable response. Moreover, analytical results show generally agreement with the results obtained by the proposed simulation scheme.
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Acknowledgments
This project is supported by the National Science Foundation of Fujian Province under the Grant No.(2014J01014) and the National Natural Science Foundation of China (No: 11302157, 51208217), and Research Award Fund for Outstanding Young Researcher in Higher Education Institutions of Fujian Province. Besides, the first author would like to appreciate the China Scholarship Council for sponsoring the visiting at University of California, Merced under the Grant No.(201408350008).
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Chen, L., Zhao, T., Li, W. et al. Bifurcation control of bounded noise excited Duffing oscillator by a weakly fractional-order \(\varvec{PI}^{\varvec{\lambda }} \varvec{D}^{\varvec{\mu }}\) feedback controller. Nonlinear Dyn 83, 529–539 (2016). https://doi.org/10.1007/s11071-015-2345-1
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DOI: https://doi.org/10.1007/s11071-015-2345-1