WANG Xin,KANG Kai,JIN Hua. Bifurcation and stability of coexistence attractors in a time-varying stiffness impact vibration system[J]. Journal of Mechanical Strength,2025,47(10):43-50.
WANG Xin,KANG Kai,JIN Hua. Bifurcation and stability of coexistence attractors in a time-varying stiffness impact vibration system[J]. Journal of Mechanical Strength,2025,47(10):43-50. DOI: 10.16579/j.issn.1001.9669.2025.10.005.
BIFURCATION AND STABILITY OF COEXISTENCE ATTRACTORS IN A TIME-VARYING STIFFNESS IMPACT VIBRATION SYSTEM
Considering the time-varying stiffness characteristics of mechanical systems
a single-degree-of-freedom time-varying impact vibration system model with clearance stiffness was studied. The dynamic model and Poincaré map were established
and numerical calculation methods were given. The influence of the ratio of time-varying stiffness amplitudes on the dynamic response and characteristics of the system was analyzed using numerical simulation and the maximum Lyapunov exponent. By combining multiple initial value bifurcation diagrams
attraction domains
phase diagrams
and Poincaré mapping diagrams
the evolution and bifurcation of coexisting attractors in the system were studied by applying the continuation shooting method. When the bifurcation parameter changes and the system exhibits the coexistence phenomenon
the reasons for the appearance and disappearance of local attractors and the distribution mechanism of unstable attractors in the attraction domain before and after bifurcation are revealed. The stability change rule of coexisting attractors is obtained.
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references
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