Mathematics analysis and chaos in an ecological model with an impulsive control strategy

Mathematics analysis and chaos in an ecological model with an impulsive control strategy
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具有脉冲控制策略的生态模型中的数学分析和混沌

DOI:
10.1016/j.cnsns.2010.04.017
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发表时间:
2011-02
期刊:
非线性科学与数值模拟通讯(英文版)
影响因子:
--
通讯作者:
Zhong, Shouming
Zhong, Shouming
中科院分区:
其他
文献类型:
--
作者:
Agarwal, Ravi P.;Yu, Hengguo;Zhong, Shouming

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本文以生态学和常微分方程的理论和方法为基础,建立了一个具有脉冲控制策略的生态学模型。利用脉冲方程理论、小幅扰动技巧和比较技巧,得到了最低层食饵和中层捕食者灭绝周期解全局渐近稳定的条件.证明了该系统是永久性的。进一步,数值研究了脉冲扰动对固有振动的影响,表现出丰富的动力学行为,如倍周期分岔、倍周期分岔、混沌带、窄或宽的周期窗口、混沌危机等。此外,最大李雅普诺夫指数的计算揭示了模型的混沌动力学行为。同时,利用傅立叶谱研究了奇异吸引子的定性性质。这些结果对研究生态系统的动态复杂性具有一定的参考价值。
In this paper, on the basis of the theories and methods of ecology and ordinary differential equation, an ecological model with an impulsive control strategy is established. By using the theories of impulsive equation, small amplitude perturbation skills and comparison technique, we get the condition which guarantees the global asymptotical stability of the lowest-level prey and mid-level predator eradication periodic solution. It is proved that the system is permanent. Further, influences of the impulsive perturbation on the inherent oscillation are studied numerically, which shows rich dynamics, such as period-doubling bifurcation, period-halving bifurcation, chaotic band, narrow or wide periodic window, chaotic crises,etc. Moreover, the computation of the largest Lyapunov exponent demonstrates the chaotic dynamic behavior of the model. At the same time, we investigate the qualitative nature of strange attractor by using Fourier spectra. All these results may be useful for study of the dynamic complexity of ecosystems.
DOI: 10.1016/0960-0779(95)80041-e
发表时间: 1995
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