Moment Lyapunov exponent of three-dimensional system under bounded noise excitation |
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Authors: | Ci-jun Fang Jian-hua Yang Xian-bin Liu |
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Institution: | 1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China;
2. School of Science, Hubei University of Technology, Wuhan 430068, P. R. China;
3. School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, P. R. China |
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Abstract: | In the present paper, the moment Lyapunov exponent of a codimensional two-bifurcation system is evaluted, which is on a three-dimensional
central manifold and subjected to a parametric excitation by the bounded noise. Based on the theory of random dynamics, the
eigenvalue problem governing the moment Lyapunov exponent is established. With a singular perturbation method, the explicit
asymptotic expressions and numerical results of the second-order weak noise expansions of the moment Lyapunov are obtained
in two cases. Then, the effects of the bounded noise and the parameters of the system on the moment Lyapunov exponent and
the stability index are investigated. It is found that the stochastic stability of the system can be strengthened by the bounded
noise. |
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Keywords: | bounded noise moment Lyapunov exponent stability index |
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