Stochastic bifurcation of a strongly non-linear vibro-impact system with Coulomb friction under real noise. (English) Zbl 1423.70053
Summary: This manuscript investigated the response of a strongly non-linear vibro-impact (VI) system with Coulomb friction. The impact model is used with classical impact. The excitation is modelled by real noise. First, the VI system is converted into a simplified system without any barrier by non-smooth transformation (symmetric transformation). The stochastic averaging method is adopted to obtain the theoretical stationary probability function of the VI system. Next, the Duffing Van der Pol VI system with Coulomb friction is used to verify the validity of the proposed theoretical method compared with numerical simulations. Moreover, the influence of bandwidth, noise intensity, and friction amplitude are further analyzed in detail on the probability density function (PDF) of distribution of the VI system. The P-bifurcation is studied by a qualitative change of friction amplitude and restitution coefficient on the stationary probability distribution, which indicated that these parameters can arouse the emergence of stochastic P-bifurcation.
MSC:
| 70K50 | Bifurcations and instability for nonlinear problems in mechanics |
| 70F40 | Problems involving a system of particles with friction |
| 34F05 | Ordinary differential equations and systems with randomness |
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