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arXiv 1708.03444math.DS
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平面分段光滑二次拟齐次微分系统的全局动力学与开折

Global dynamics and unfolding of planar piecewise smooth quadratic quasi-homogeneous differential systems

Yilei Tang

摘要:

本文研究了平面分段光滑二次拟齐次非齐次多项式微分系统的全局动力学和分支。给出了分段光滑二次拟齐次系统中心存在的充分和必要条件。而且,如果中心存在,则它是全局非等距的,这在光滑二次拟齐次系统中是不可能出现的。然后研究了分段光滑二次拟齐次非齐次系统的全局结构。最后研究了分段光滑二次拟齐次中心的极限环分支,并应用Melnikov方法对分段光滑近哈密顿系统给出了从中心的周期轨道分支出的极限环的最大个数.

英文摘要:

In this paper we research global dynamics and bifurcations of planar piecewise smooth quadratic quasi--homogeneous but non-homogeneous polynomial differential systems. We present sufficient and necessary conditions for the existence of a center in piecewise smooth quadratic quasi--homogeneous systems. Moreover, the center is global and non-isochronous if it exists, which cannot appear in smooth quadratic quasi-homogeneous systems. Then the global structures of piecewise smooth quadratic quasi--homogeneous but non-homogeneous systems are studied. Finally we investigate limit cycle bifurcations of the piecewise smooth quadratic quasi-homogeneous center and give the maximal number of limit cycles bifurcating from the periodic orbits of the center by applying the Melnikov method for piecewise smooth near-Hamiltonian systems.

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