Abstract
Under the suitable parameter combination, the vibro-impact system with symmetry exhibits symmetric quasi-periodic motions in the vicinity of Neimark–Sacker bifurcation (i.e., NS bifurcation) point satisfying 1:2 resonant conditions and double Neimark–Sacker bifurcation (i.e., NS–NS bifurcation) point. Based on the fact that the Poincaré map P is the second iteration of another virtual implicit map Q, the coexistence and symmetry of the attractor of the Poincaré map is discussed by means of the limit set theory. The map Q can capture two conjugate limit sets and hence can capture two conjugate quasi-periodic motions. Based on the Poincaré map, QR method is used to compute Lyapunov dimension, which can be used to characterize various quasi-periodic motions. Numerical simulation shows that the symmetric quasi-periodic motion can lose the stability and bifurcate into various subharmonic quasi-periodic motions via period-doubling bifurcation. Torus bifurcation of the symmetric quasi-periodic motion can also take place, which induces to a symmetric torus in the Poincaré section. Bifurcation of quasi-periodic motion will give birth to the coexistence of quasi-periodic motion. It is shown that all quasi-periodic attractors have at least a zero Lyapunov exponent, but various quasi-periodic attractors have different Lyapunov dimensions.
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This work is supported by National Natural Science Foundation of China (11272268, 11172246).
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Appendices
Appendix 1: The phase angle and the integration constants
For the symmetric period n-2 motion of the vibro-impact system (i.e., the associated symmetric fixed point of the Poincaré map), the phase angle \(\tau \) in Eq. (8) is solved according to Eq. (12):
Inserting \(\tau =\tau _0 \) into Eq. (12), \(a_1 \) can be solved. Subsequently, all integration constants in Eq. (8) can be solved as
where
where
where
Appendix 2: The integration constants \(a_{ij} \) and \(b_{ij} \) determined by the initial conditions after impacting
Let the initial conditions be \(x_{10} \), \(\dot{x}_{10} \), \(x_{20} \), \(\dot{x}_{20} \), \(\dot{x}_{30} \), \(\tau _0 \), the integration constants \(a_{i1} \) and \(b_{i1} \) after impacting at the right stop can be expressed as
and the integration constants \(a_{i2} \) and \(b_{i2} \) after impacting at the left stop can be expressed as
where
where
where
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Yue, Y. Bifurcations of the symmetric quasi-periodic motion and Lyapunov dimension of a vibro-impact system. Nonlinear Dyn 84, 1697–1713 (2016). https://doi.org/10.1007/s11071-016-2598-3
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DOI: https://doi.org/10.1007/s11071-016-2598-3