类似光滑系统的余维二分岔的分类方法,余维二擦边分岔被划分为三种类型,分别是擦边点退化、退化环擦边(非双曲)以及两个擦边事件同时发生。本文分析了一个二自由度对称约束的碰撞振动系统,得到了该系统第二类余维二擦边分岔的存在条件。首先,考虑双侧擦边周期运动,理论推导出双侧擦边周期运动的存在性条件。利用不连续映射方法,得出1/1/n碰撞周期运动发生鞍结分岔和倍周期分岔的解析表达式。然后,结合双擦边周期运动的存在性条件和1/1/n碰撞周期运动的分岔条件,推导出发生余维二擦边分岔时满足的解析表达式,并以周期1运动为例,给出了余维二擦边分岔点的分布。
Abstract
similar to the approach used to classify co-dimension-two bifurcations in smooth systems, co-dimension-two grazing bifurcations can be put into one of the following three types: degenerate gazing point, grazing of degenerate cycles, simultaneous occurrence of two grazings. This paper obtained the existence condition of the second type co-dimension-two grazing bifurcation for a two-degree-of-freedom vibro-impact system with symmetric constraints. First, considering the periodic motion of the double-sided grazing, the existence condition of the periodic motion of the double-sided grazing was deduced theoretically. Using the discontinuous mapping method, the analytical expressions of saddle-node bifurcation and period doubling bifurcation for 1/1/n impact periodic motion are derived. Then, combining the existence condition of the grazing periodic motion and the bifurcation condition of the 1/1 /n impact periodic motion, the analytical expression of co-dimensional-two grazing bifurcation was obtained, and The distribution of co-dimensional-two bifurcation points is analyzed for period one motion.
关键词
对称约束碰振系统 /
不连续映射方法 /
余维二擦边分岔
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Key words
Vibro-impact system with symmetric constraints /
the discontinuous mapping method;co-dimensional-two grazing bifurcation
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参考文献
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