Yang, G.; Deng, Z.; Du, L.; Lin, Z. Response Analysis of the Three-Degree-of-Freedom Vibroimpact System with an Uncertain Parameter. Entropy2023, 25, 1365.
Yang, G.; Deng, Z.; Du, L.; Lin, Z. Response Analysis of the Three-Degree-of-Freedom Vibroimpact System with an Uncertain Parameter. Entropy 2023, 25, 1365.
Yang, G.; Deng, Z.; Du, L.; Lin, Z. Response Analysis of the Three-Degree-of-Freedom Vibroimpact System with an Uncertain Parameter. Entropy2023, 25, 1365.
Yang, G.; Deng, Z.; Du, L.; Lin, Z. Response Analysis of the Three-Degree-of-Freedom Vibroimpact System with an Uncertain Parameter. Entropy 2023, 25, 1365.
Abstract
The inherent non-smoothness of vibroimpact system leads to complex behaviors as well as strong sensitive dependence on parameter changes. Unfortunately, uncertainties and errors in system parameters are inevitable in mechanical engineering. Therefore, the investigations of dynamical behaviors for vibroimpact systems with stochastic parameters are highly essential. The present study aims to analyze the dynamical characteristics of the three-degree-of-freedom vibroimpact system with an uncertain parameter by means of the Chebyshev polynomial approximation method. Specifically, the vibroimpact system model considered is one with unilateral constraint. Firstly, the three-degree-of-freedom vibroimpact system with an uncertain parameter is transformed into an equivalent deterministic form by the Chebyshev orthogonal approximation. Then, the ensemble means responses of the stochastic vibroimpact system are derived. Numerical simulations are performed to verify the effectiveness of the approximation method. Furthermore, the periodic and chaos motions under different system parameters are investigated, and the bifurcations of the vibroimpact system are analyzed by the Poincaré map. The results demonstrate that both the restitution coefficient and the random factor can induce the appearance of the periodic bifurcation. It is worth noting that the bifurcations fundamentally differ between the stochastic and deterministic systems. The former has a bifurcation interval, while the latter occurs at a critical point.
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