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1.
Immunity clone algorithm with particle swarm evolution   总被引:1,自引:0,他引:1  
1 INTRODUCTION The immune system’s ability to evolve cells to fight invading pathogens has been investigated for its computationally useful properties for several years[1], which is inspired by the biological immune system[2?3], and is called artificial immune systems[4]. Artificial immune systems are relatively new in the field of optimization and there is a great deal of derivation of various algorithmic alternatives for better localization of optimal solutions and of application of the…  相似文献   

2.
The chaotification problem of discrete Hamilton systems in one dimensional space is investigated and corresponding chaotification theorem is established. Feedback control techniques is used to make arbitrary discrete Hamilton systems chaotic, or enhance its existing chaotic behaviors. By designing a universal controller and combining anti-integrable limit it is proved that chaos of the controlled systems is in the sense of Devaney. In particular, the systems corresponding to the original systems and designed controllers are only required to satisfy some mild assumptions. Moreover, the range of the coefficient of the controller is given.  相似文献   

3.
A generalized multi-layered granulation structure used by neighborhood systems is proposed. With granulated views, the concepts of approximations under incomplete information systems are studied, which are represented by covering of the universe. With respect to different levels of granulations, a pair of lower and upper approximations is defined and an approximation structure is investigated, which lead to a more general approximation structure. The generalized multi-layered granulation structure provides a basis of the proposed framework of granular computing. Using this framework, the interesting and useful results about information granulation and approximation reasoning can be obtained. This paper presents some useful explorations about the incomplete information systems from information views.  相似文献   

4.
A scheme of adaptive control based on a recurrent neural network with a neural network compensation is presented for a class of nonlinear systems with a nonlinear prefix. The recurrent neural network is used to identify the unknown nonlinear part and compensate the difference between the real output and the identified model output. The identified model of the controlled object consists of a linear model and the neural network. The generalized minimum variance control method is used to identify parameters, which can deal with the problem of adaptive control of systems with unknown nonlinear part, which can not be controlled by traditional methods.Simulation results show that this algorithm has higher precision, faster convergent speed.  相似文献   

5.
A non-Noether conserved quantity for the Hamiltonian system is studied. A particular infinitesimal transformation is given and the determining equations of Lie symmetry are established. An existence theorem of the non-Noether conserved quantity is obtained. An example is given to illustrate the application of the result.  相似文献   

6.
7.
The development and application of new reliability models and methods are presented to analyze the system relia- bility of complex condition monitoring systems.The methods include a method analyzing failure modes of a type of redundant con- dition monitoring systems (RCMS) by invoking failure tree model,Markov modeling techniques for analyzing system reliability of RCMS,and methods for estimating Markov model parameters.Furthermore,a computing case is investigated and many conclu- sions upon this case are summarized.Results show that the method proposed here is practical and valuable for designing condition monitoring systems and their maintenance.  相似文献   

8.
The effect of random phase on the Josephson junction system dynamic model is investigated. It is shown that random phase has the suppressing ability for controlling chaos. The top Lyapunov exponent is used to detect the chaotic dynamics in the system, and the method for calculating the top Lyapunov exponent is based on Khasminskii's spherical coordinate formulation for linear stochastic systems. In addition, Poincare map, phase portraits and time evolution are investigated to verify the obtained results. It is found that these results have the excellent agreement.  相似文献   

9.
The significant features concerning liveness of generalized free-choice (GFC) systems are discussed.These features provide a sound basis for analyzing liveness of GFC systems in a reductive approach.What is interesting is that the characterization is just based on deadlocks,rather than on both deadlocks and traps as Commoner characterizes the liveness of ordinary free-choice systems.Several proof techniques for proving liveness-related features of GFC systems are introduced.  相似文献   

10.
A wavelet based identification method for linear time-varying systems is presented,and the ridge and skeleton of the continuous wavelet transform of free response is used to extract time-varying parameters. The stiffness and damping coefficients of single-degree-of—freedom systems,frequencies and damping ratios of multi-degree-of-freedom systems are estimated without any prior information of systems. The proposed method is applied to linear time-varying systems with both abrupt and smooth variation parameters. Gaussian white noise is added to the response to test the anti-noise performance of the algorithm. The simulation results show that the proposed method is capable of accurately tracking the variation of the systems.  相似文献   

11.
广义哈密顿控制系统是经典哈密顿系统的推广和发展,该系统所描述的是一类具有能量耗散以及与外部环境有能量交换的更广泛的动态开放系统.首先介绍哈密顿系统的发展历程;然后介绍广义哈密顿控制系统的研究热点和最新进展.目的是使读者对广义哈密顿系统理论和基于能量控制有一个较为全面地了解.  相似文献   

12.
研究了一类广义Hamilton系统的有限时间稳定性及其在仿射非线性系统控制设计中的应用,并给出几个新结果.利用Hamilton系统的结构特性和已有的关于局部有限时间稳定的结果,给出该类Hamilton系统有限时间稳定的几个判定准则.把得到的新结果应用于仿射非线性系统的有限时间控制设计中.通过选取恰当的Hamil-ton...  相似文献   

13.
利用常微分方程的连续有限元法证明了m次连续有限元算法能保持哈密尔顿系统的能量守恒。对线性哈密尔顿系统的m次连续有限元算法为辛算法,且能保持能量守恒,数值例子也验证了此结论。  相似文献   

14.
利用Lie代数和Poisson括号建立广义Birkhoff系统的Poisson定理 ,得到广义Birkhoff系统关于第一积分的广义Poisson条件 ,提出了广义Poisson定理 ,并举例说明结果的应用  相似文献   

15.
常微分方程的连续有限元法对非线性哈密尔顿系统连续二次有限元在5阶量意义下近似保辛,且保持能量守恒。在数值实验中,结合庞加莱截面和混沌运动对初值的敏感性,将有限元法用于求解有混沌现象的哈密尔顿系统,并与辛差分法进行比较,数值试验结果与理论相吻合,为哈密尔顿混沌的研究提供了较好的方法。  相似文献   

16.
基于前人的工作,在Hamiltonian矩阵约化过程中,采用辛相似变换,使得Hamiltonian矩阵在辛相似变换下仍保持Hamilton结构,这样从根本上确保了特征值的正确性,而且不至于出现特征值混乱的局面  相似文献   

17.
在动力天文学和控制理论中,Hamilton正则运动方程被用来描述和研究多数问题,本文针对这一特点,构建用于各阶段的形成Hamiltonian矩阵特征问题的辛方法,其Hamilton结构在Hamiltonian矩阵的辛约化过程中得到充分保证,文中方法简易可行,提供的辛方法具有较强的有效性和稳定性。  相似文献   

18.
研究具有单面非完整约束的力学系统的Noether对称性与守恒量.基于Hamilton作用量在r参数有限变换群G,的无限小变换下的不变性,建立了系统的广义Noether定理及其逆定理,并举例说明结果的应用.  相似文献   

19.
分析了时滞连续广义系统的鲁棒稳定性,研究了时滞连续广义系统保持稳定的条件,同时给出了其对应的扰动系统.针对扰动系统,给出了保持稳定性的最大范围,即时滞连续广义系统的稳定半径.给出了时滞连续广义系统稳定半径的定义以及计算,并且给出了系统指数不超过1时的具体算法.最后以具体的算例检验了结论的正确性.  相似文献   

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