SERIES-MODE PITCHFORK-HYSTERESIS BURSTING OSCILLATIONS AND THEIR DYNAMICAL MECHANISMS1)
ZhangYi, HanXiujing2),, BiQinsheng Faculty of Civil Engineering and Mechanics, Jiangsu University , Zhenjiang 212013, Jiangsu, China 中图分类号:O322 文献标识码:A
关键词:Duffing系统;慢变周期参数;延迟叉型分岔;串联式簇发振荡;频率转换快慢分析法 Abstract Bursting oscillations is a spontaneous physical phenomenon existing in natural science, which has various patterns according to their dynamical regimes. For instance, bursting of point-point type means bursting patterns related to transition behaviors among different equilibrium attractors. Pitchfork-hysteresis bursting, induced by delayed pitchfork bifurcation, is a kind of point-point type bursting pattern showing simple dynamical characteristics. The present paper takes the Duffing system with multiple-frequency parametric excitations as an example in order to reveal bursting patterns, related to delayed pitchfork bifurcation, showing complex characteristics, i.e., the series-mode pitchfork-hysteresis bursting oscillations. We considered the case when one excitation frequency is an integer multiple of the other, obtained the fast subsystem and the slow variable of the Duffing system by frequency-transformation fast-slow analysis, and analyzed bifurcation behaviors of the fast subsystem. Our study shows that two or multiple pitchfork bifurcation points can be observed in the fast subsystem, and thus two or multiple pitchfork-hysteresis bursting patterns are created when the slow variable passes through these points. In particular, the pitchfork-hysteresis bursting patterns are connected in series, and as a result, the so-called series-mode pitchfork-hysteresis bursting oscillations are generated. Besides, the effects of parameters on the series-mode pitchfork-hysteresis bursting oscillations are analyzed. It is found that the damping of the system and the maximum excitation amplitude show no qualitative impact on corresponding dynamical mechanisms, while the smaller one may lead to vanish of busting oscillations. Our findings reveal the road from simple dynamical characteristics of point-point type bursting oscillation related to complex one, thereout, a complement and expansion for nowadays bursting dynamics is obtained.
显示原图|下载原图ZIP|生成PPT 图8不同$\beta _1 $下的簇发振荡,其他参数同图2(b) ... -->Fig.8Bursting oscillations related to different values of$\beta _1 $, where the other parameters are the same as in Fig. 2(b) ... -->
3 结 论
研究了多频参数激励Duffing系统的簇发动力学,揭示了与延迟叉型分岔相关的复杂的"点-点型"簇发振荡,即"串联式叉型滞后簇发振荡". 研究表明,多频参数激励能够导致快子系统其叉型分岔点数量的不断增多;当慢变量穿越这些分岔点时,先后形成了多个"叉型滞后簇发振荡". 这些簇发振荡的动力学行为虽然较为简单,但它们首尾相接,构成了具有复杂动力学特性的"串联式叉型滞后簇发振荡". 进一步的分析表明,"串联式叉型滞后簇发振荡"其大幅振荡的数量与参数激励的频率比有关. 我们的研究揭示了"点-点型"簇发振荡通向复杂性的道路,即多频参数激励诱发的叉型分岔点数量的不断增多. 此外,探讨了参数对"叉型滞后簇发振荡"的影响. 结果表明,$\beta _2 $的不断增大会导致"渐进线"的出现,由此形成了一个发散区域,并最终导致簇发振荡的消失;系统参数$\delta $会对平衡点的类型产生影响,但不会影响平衡点的稳定性及分岔,而$\beta _1 $等其他系统参数对簇发动力学没有定性影响. The authors have declared that no competing interests exist.
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