排序方式: 共有37条查询结果,搜索用时 15 毫秒
11.
本文推得了一种比例积分型广义预测控制算法,在算法中加入了对系统的输入和输出信号的约束以加强算法应用能力,在控制值的优化示解中使用了矩阵奇异值分解以增加算法的精度和数值稳定性。 相似文献
12.
This paper reports a new four-dimensional continuous autonomous hyperchaos generated from the Lorenz chaotic system by introducing a nonlinear state feedback controller. Some basic properties of the system are investigated by means of Lyapunov exponent spectrum and bifurcation diagrams. By numerical simulating, this paper verifies that the four-dimensional system can evolve into periodic, quasi-periodic, chaotic and hyperchaotic behaviours. And the new dynamical system is hyperchaotic in a large region. In comparison with other known hyperchaos, the two positive Lyapunov exponents of the new system are relatively more larger. Thus it has more complex degree.[第一段] 相似文献
13.
14.
Local bifurcation phenomena in a four-dlmensional continuous hyperchaotic system, which has rich and complex dynamical behaviours, are analysed. The local bifurcations of the system are investigated by utilizing the bifurcation theory and the centre manifold theorem, and thus the conditions of the existence of pitchfork bifurcation and Hopf bifurcation are derived in detail. Numerical simulations are presented to verify the theoretical analysis, and they show some interesting dynamics, including stable periodic orbits emerging from the new fixed points generated by pitchfork bifurcation, coexistence of a stable limit cycle and a chaotic attractor, as well as chaos within quite a wide parameter region. 相似文献
15.
中心流形理论提供了一个将高维系统降维研究的方法,应用该理论研究了一个新的混沌系统的基本特性,给出中心流形上流方程,分析这个新的混沌系统的叉式分岔.通过构建电路实现了该混沌系统,从而验证了系统的混沌行为,证实了混沌吸引子的存在.同时说明了由于电路信号频率与数值信号频率的不同所带来的数值仿真与物理实现之间在应用上有着重要区别.最后利用单变量反馈控制方法实现了新系统的同步控制,并给出了完整的同步实现电路.
关键词:
三维混沌系统
中心流形
电路实现
同步 相似文献
16.
研究了L2(R)中小波框架{ψj,k}j,k={sjψ(sj·-kb)}j,k∈Z的膨胀列{sj}j的性质.如果{ψj,k}j,k是L2(R)的一个小波框架,那么膨胀列是无界的,在某些条件下{sj}j∈Z一定能够被重排为指标集Z上的一个非减数列,而且存在常数λ,μ∈(0,1)和p∈Z ,使得对j∈Z有λ相似文献
17.
Hyperchaos--chaos--Hyperchaos Transition in a Class of On--Off Intermittent Systems Driven by a Family of Generalized Lorenz Systems 下载免费PDF全文
Blowout bifurcation in nonlinear systems occurs when a chaotic attractor lying in some symmetric subspace becomes transversely unstable. A class of five-dimensional continuous autonomous systems is considered, in which a two-dimensional subsystem is driven by a family of generalized Lorenz systems. The systems have some common dynamical characters. As the coupling parameter changes, blowout bifurcations occur in these systems and brings on change of the systems' dynamics. After the bifurcation the phenomenon of on-off intermittency appears. It is observed that the systems undergo a symmetric hyperchaos-chaos-hyperchaos transition via or after blowout bifurcations. An example of the systems is given, in which the drive system is the Chen system. We investigate the dynamical behaviour before and after the blowout bifurcation in the systems and make an analysis of the transition process. It is shown that in such coupled chaotic continuous systems, blowout bifurcation leads to a transition from chaos to hyperchaos for the whole systems, which provides a route to hyperchaos. 相似文献
18.
This paper deeply analyzes the closed-loop nature of GPC in the framework of internal model control (IMC) theory. A new sort of relation lies in the feedback structure so that robust reason can be satisfactorily explained. The result is significant because the previous conclusions are only applied to open-loop stable plant (or model). 相似文献
19.
A finite-time controller is designed for a class of nonlinear systems
subject to sector nonlinear inputs. A novel and simple approach is suggested
based on the finite-time control principle. The designed sliding-mode
controller
can drive a chaotic system to track a smooth target signal in a
finite time.
The chaotic Duffing--Holmes oscillator is used for verification and
demonstration. 相似文献
20.
新型离散跟踪-微分器的设计与分析 总被引:1,自引:0,他引:1
§ 1 IntroductionAt present,difference method is often used forcomputing the differential coefficientofsignals.Since the error of this method is very obvious,it is not adapted to the systems ofhigh precision.There is a nonlinear tracking-differentiator(T-D) given in paper[1 ] ,whose precision is quite better than thatwith difference method.Itchanges the situation ofconsistent use of difference method.The designed tracking-differentiator has an analyticsolution,and has been applied to many … 相似文献