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在束晕-混沌的小波函数控制已实现的基础上,给出了一种形式更为简单的小波函数控制器,并研究了束晕混沌的多周期间隔反馈控制方法.以控制初始条件遵从Kapchinshij-Vladimirskij分布的离子束为例进行模拟,结果表明,通过适当选择间隔的周期数和小波控制器的控制参数,仍能很有效地对束晕混沌进行控制,并能达到消除束晕及其再生现象的理想结果.研究结果可望为实用强流加速器的研制提供有价值的参考
关键词:
小波函数控制器
多周期间隔
束晕-混沌
强流离子束 相似文献
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The K-V beam through an axisymmetric uniform-focusing channel is studied
using the particle--core model. The beam halo-chaos is found, and a sample
function controller is proposed based on mechanism of halo formation and
strategy of controlling halo-chaos. We perform multiparticle simulation to
control the halo by using the sample function controller. The numerical
results show that our control method is effective. We also find that the radial
ion density changes when the ion beam is in the channel: not only can the
halo-chaos and its regeneration be eliminated by using the sample
function control method, but also the density uniformity can be found at the
beam's centre as long as an appropriate control method is chosen. 相似文献
34.
With system parameters falling into a certain area, power system with excitation limits experiences complicated chaotic oscillations which threaten the secure and stable operation of power system. In this paper, to control these unwanted chaotic oscillations, a straightforward adaptive chaos controller based on Lyapunov asymptotical stability theory is designed. Since the presented controller does not need to change the controlled system structure and not to use any information of system except the system state variables, the designed controller is simple and desirable. Simulation results show that the proposed control law is very effective. This work is helpful to maintain the power system's security operation.[第一段] 相似文献
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通过增加外腔反馈式半导体激光器的激光反馈时间,使系统处于混沌状态,再采用滑模变结构控制方法实现这种激光器的混沌控制.该方法的优点是系统既能很快地获得稳定的输出激光,又能根据工程需要实现激光输出功率强度的灵活调整.理论分析和数值计算结果表明控制结果具有很强的稳定性和鲁棒性.研究结果对改善实际激光系统稳态输出的快速性、输出功率的灵活可调性和能量转换效率有较好的参考价值.
关键词:
混沌
外腔反馈式半导体激光器
滑模变结构控制
外腔长度 相似文献
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Because a brain consists of tremendous neuronal networks with different neuron numbers ranging from tens to tens of thousands, we study the coherence resonance due to ion channel noises in globally coupled neuronal networks with different neuron numbers. We confirm that for all neuronal networks with different neuron numbers there exist the array enhanced coherence resonance and the optimal synaptic conductance to cause the maximal spiking coherence. Furthermoremore, the enhancement effects of coupling on spiking coherence and on optimal synaptic conductance are almost the same, regardless of the neuron numbers in the neuronal networks. Therefore for all the neuronal networks with different neuron numbers in the brain, relative weak synaptic conductance (0.1 mS/cm2) is sufficient to induce the maximal spiking coherence and the best sub-threshold signal encoding. 相似文献
39.
Small-World Connections to Induce Firing Activity and Phase Synchronization in Neural Networks 下载免费PDF全文
We investigate how the firing activity and the subsequent phase synchronization of neural networks with smallworld topological connections depend on the probability p of adding-links. Network elements are described by two-dimensional map neurons (2DMNs) in a quiescent original state. Neurons burst for a given coupling strength when the topological randomness p increases, which is absent in a regular-lattice neural network. The bursting activity becomes frequent and synchronization of neurons emerges as topological randomness further increases. The maximal firing frequency and phase synchronization appear at a particular value of p. However, if the randomness p further increases, the firing frequency decreases and synchronization is apparently destroyed. 相似文献
40.
This paper studies how phase synchronization in complex networks
depends on random shortcuts, using the piecewise-continuous chaotic
Chua system as the nodes of the networks. It is found that for a
given coupling strength, when the number of random shortcuts is
greater than a threshold the phase synchronization is induced. Phase
synchronization becomes evident and reaches its maximum as the
number of random shortcuts is further increased. These phenomena
imply that random shortcuts can induce and enhance the phase
synchronization in complex Chua systems. Furthermore, the paper
also investigates the effects of the coupling strength and it is
found that stronger coupling makes it easier to obtain the
complete phase synchronization. 相似文献