THERMAL SCIENCE

International Scientific Journal

Yajie Li

,

Zhiqiang Wu

,

Qixun Lan

,

Yujie Cai

,

Huafeng Xu

,

Yongtao Sun

STOCHASTIC BIFURCATION ANALYSIS OF A BISTABLE DUFFING OSCILLATOR WITH FRACTIONAL DAMPING UNDER MULTIPLICATIVE NOISE EXCITATION

ABSTRACT
The stochastic P-bifurcation behavior of bi-stability in a Duffing oscillator with fractional damping under multiplicative noise excitation is investigated. Firstly, in order to consider the influence of Duffing term, the non-linear stiffness can be equivalent to a linear stiffness which is a function of the system amplitude, and then, using the principle of minimal mean square error, the fractional derivative term can be equivalent to a linear combination of damping and restoring forces, thus, the original system is simplified to an equivalent integer order Duffing system. Secondly, the system amplitude’s stationary probability density function is obtained by stochastic averaging, and then according to the singularity theory, the critical parametric conditions for the system amplitude’s stochastic P-bifurcation are found. Finally, the types of the system’s stationary probability density function curves of amplitude are qualitatively analyzed by choosing the corresponding parameters in each area divided by the transition set curves. The consistency between the analytical results and the numerical results obtained from Monte-Carlo simulation verifies the theoretical analysis, and the method used in this paper can directly guide the design of the fractional order controller to adjust the behaviors of the system.
KEYWORDS
stochastic P-bifurcation, fractional damping, multiplicative noise excitation, transition set, Monte Carlo simulation
PAPER SUBMITTED: 2020-02-10
PAPER REVISED: 2020-06-20
PAPER ACCEPTED: 2020-06-20
PUBLISHED ONLINE: 2021-01-31
DOI REFERENCE: https://doi.org/10.2298/TSCI200210040L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 2, PAGES [1401 - 1410]
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Stochastic bifurcation analysis of a bistable Duffing oscillator with fractional damping under multiplicative noise excitation

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence