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Bifurcation Modes of Periodic Solution in a Duffing System Under Constant Force as Well as Harmonic Excitation

Lei Hou

http://orcid.org/0000-0003-0271-7323

School of Astronautics, Harbin Institute of Technology, Harbin 150001, P. R. China

E-mail Address: houlei@hit.edu.cn

Corresponding author.

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Xiaochao Su

School of Astronautics, Harbin Institute of Technology, Harbin 150001, P. R. China

E-mail Address: chaoxiaosu@stu.hit.edu.cn

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, and

Yushu Chen

School of Astronautics, Harbin Institute of Technology, Harbin 150001, P. R. China

E-mail Address: yschen@hit.edu.cn

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https://doi.org/10.1142/S0218127419501736Cited by:14 (Source: Crossref)

Abstract

This paper focuses on the classification of the bifurcation modes of a Duffing system under the combined excitations of constant force and harmonic excitation. The Harmonic Balance method combined with the arc-length continuation is used to obtain the periodic solutions of the system, and the Floquet theory is employed to analyze the stability of the corresponding solutions. Accordingly, the frequency-response curves affected respectively by the constant force and the magnitude of the harmonic excitation are analyzed to show the basic dynamical properties of the system. Afterwards, the bifurcation investigations are carried out with the aid of the two-state variable singularity method. It is derived that there are a total of six different types of bifurcation modes due to the effects of the constant force and the magnitude of the harmonic excitation. At last, the effects of the nonlinearity parameter and the damping ratio on the bifurcation modes of the system are also discussed. The results obtained in this paper extend the findings in reference that the system can have markedly three types of frequency-response curves: with only one solution, or with maximum three or five solutions for a certain excitation frequency, and contribute to a better understanding of the significant influence of the constant force.

Keywords:

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