共查询到18条相似文献,搜索用时 168 毫秒
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强共振情况下冲击成型机的亚谐与Hopf分岔 总被引:4,自引:0,他引:4
通过理论分析与数值仿真研究了双质体冲击振动成型机的周期运动在强共振条件下的亚谐分岔与Hopf分岔,证实了此系统的1/1周期运动在强共振(λ0^4=1)条件下可以分岔为稳定的4/4周期运动及概周期运动.讨论了冲击映射的奇异性,分析了冲击振动系统的“擦边”运动对强共振条件下周期运动及全局分岔的影响。 相似文献
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具有单侧刚性约束的两自由度振动系统在强共振条件下的拟周 … 总被引:6,自引:1,他引:5
采用理论分析和数值仿真相结合的方法,研究了一类两自由度碰撞振动系统在一种强共振条件下的Hopf分叉问题,分析并证实了碰撞振动系统在此共振条件下可由稳定的周期1-1振动分叉为不稳定的周期3-3振动,讨论了亚谐振动向混沌运动的演化过程。 相似文献
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本文首先给出并证明了解一类弱非线性问题的广义Greeen法,利用这一方法求得非线性Hill振动系统在非共振和共振二种民政部下的周期响就以及描述周期响应特征的二次近似分叉方程应用具有Z2对称的奇异性理论,建立了模参数与各物理参数之间的对应关系,通过对Z2余维数≥3周期分叉解的普适性分类,全面分析了共振情况下物理参数对周期分叉解特征的影响。从而使二次近似分叉方程是否能够在拓扑意义下完全描述原系统的周期 相似文献
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非线性参数激励系统的动力分叉研究 总被引:4,自引:0,他引:4
本文针对弹性梁动力曲屈分叉问题,建立了系统的非线性Mathiue方程,较全面地讨论了此类参数激励系统的1/2亚谐分叉特性,指出以往对此类问题的研究得到的只是一种退化情形下的分叉特性,阐述了分叉方程的截断对分叉结果的影响,得到了一些新的结果。文中还介绍了一个模型弹性梁系统分叉响应特性的实测结果,证实了理论分析的可靠性。 相似文献
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参数激励与强迫激励联合作用下非线性振动系统的分叉 总被引:11,自引:2,他引:11
本文利用多尺度法研究了参数激励与强迫激励联合作用下非线性振动系统的分叉问题,给出了分叉集和八种分叉响应曲线。 相似文献
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转子—轴承系统的分叉行为研究 总被引:8,自引:1,他引:8
本文完善和改进了求解非线性常微分方程组周期解及分叉特性分析的PNF方法,用以有效地分析谐波、次谐波运动和倍周期分叉行为。然后,应用该方法对一个单盘挠性转子-轴承系统的动力行为进行了研究。结果显示运动呈现拟周期分叉、倍周期分叉和切分叉等复杂动力学现象,并与一些理论和实验结论作了比较。 相似文献
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本文完善和改进了求解非线性常微分方程组周期解及分叉特性分析的PNF方法,用以有效地分析谐波、次谐波运动和倍周期分叉行为。然后,应用该方法对一个单盘挠性转子-轴承系统的动力行为进行了研究。结果显示运动呈现拟周期分叉、倍周期分叉和切分叉等复杂动力学现象,并与一些理论和实验结论作了比较。 相似文献
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考虑一端具有干摩擦的屈曲梁在轴向激励下的非线性振动系统,利用Floquet理论和谐波平衡法,研究了系统中初始屈曲度、阻尼、频率、激励振幅等各种物理参数对1/2业谐共振情况下倍周期分叉的影响,其规律与以往的数值模拟结果具有很好的一致性。 相似文献
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本文应用Normal Form理论和退化向量场的普适开折理论研究了参数激励与强迫激励联合作用下非线性振动系统的余维2退化分叉,用Melnikov方法讨论了全局分叉的存在性. 相似文献
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In this paper the nonlinear dynamic behavior of a viscoelastic circular cylindrical shell under a harmonic excitation applied at both ends is studied. The modified Flugge partial differential equations of motion are reduced to a system of finite degrees of freedom using the Galerkin method. The equations are solved by the Liapunov–Schmidt reduction procedure. In order to study 1/2 and 1/4 subharmonic parametric resonance of the shell, the transition sets in parameter plane and bifurcation diagrams are plotted for a number of situations. Results indicate that, for certain static loads, the shell may display jumps due to the presence of dynamic periodic load with small amplitude. Additionally, different physical situations are identified in which periodic oscillating phenomena can be observed, and where 1/4 subharmonic parametric resonance is simpler than the 1/2-one. 相似文献
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Codimension two bifurcation and chaos of a vibro-impact forming machine associated with 1:2 resonance case 总被引:1,自引:0,他引:1
A vibro-impact forming machine with double masses is considered. The components of the vibrating system collide with each
other. Such models play an important role in the studies of dynamics of mechanical systems with impacting components. The
Poincaré section associated with the state of the impact-forming system, just immediately after the impact, is chosen, and
the period n single-impact motion and its disturbed map are derived analytically. A center manifold theorem technique is applied to reduce
the Poincaré map to a two-dimensional map, and the normal form map associated with codimension two bifurcation of 1:2 resonance
is obtained. Unfolding of the normal form map is analyzed. Dynamical behavior of the impact-forming system, near the point
of codimension two bifurcation, is investigated by using qualitative analyses and numerical simulation. Near the point of
codimension two bifurcation there exists not only Neimark-Sacker bifurcation associated with period one single-impact motion,
but also Neimark-Sacker bifurcation of period two double-impact motion. Transition of different forms of fixed points of single-impact
periodic orbits, near the bifurcation point, is demonstrated, and different routes from periodic impact motions to chaos are
also discussed.
The project supported by the National Natural Science Foundation of China (10572055, 50475109) and the Natural Science Foundation
of Gansu Province Government of China (3ZS051-A25-030(key item)) The English text was polished by Keren Wang. 相似文献
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RESEARCH IN STABILITY OF PERIODIC MOTION,BIFURCATION AND CHAOS IN A VIBRATORY SYSTEM WITH A CLEARANCE 总被引:1,自引:0,他引:1
LuoGuanwei XieJianhua 《Acta Mechanica Solida Sinica》2003,16(2):127-133
A two-degrees-of-freedom vibratory system with a clearance or gap is under consideration based on the Poincard map. Stability and local bifurcation of the period-one doubleimpact symmetrical motion of the system are analyzed by using the equation of map. The routes from periodic impact motions to chaos, via pitchfork bifurcation, period-doubling bifurcation and grazing bifurcation, are studied by numerical simulation. Under suitable system parameter conditions, Neimark-Sacker bifurcations associated with periodic impact motion can occur in the two-degrees-of-freedom vibro-impact system. 相似文献
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Considering Peierls-Nabarro (P-N) force and viscous effect of material, the dynamic behavior of one-dimensional infinite metallic thin bar subjected to axially periodic load is investigated. Governing equation, which is sine-Gordon type equation, is derived. By means of collective-coordinates, the partial equation can be reduced to ordinary differential dynamical system to describe motion of breather. Nonlinear dynamic analysis shows that the amplitude and frequency of P-N force would influence positions of hyperbolic saddle points and change subharmonic bifurcation point, while the path to chaos through odd subharmonic bifurcations remains. Several examples are taken to indicate the effects of amplitude and period of P-N force on the dynamical response of the bar. The simulation states that the area of chaos is half-infinite. This area increases along with enhancement of the amplitude of P-N force. And the frequency of P-N force has similar influence on the system. 相似文献