Chaotic motion of the dynamical system under both additive and multiplicative noise excitations

With both additive and multiplicative noise excitations, the effect on the chaotic behaviour of the dynamical system is investigated in this paper. The random Melnikov theorem with the mean-square criterion that applies to a type of dynamical systems is analysed in order to obtain the conditions for the possible occurrence of chaos. As an example, for the Duffing system, we deduce its concrete expression for the threshold of multiplicative noise amplitude for the rising of chaos, and by combining figures, we discuss the influences of the amplitude, intensity and frequency of both bounded noises on the dynamical behaviour of the Duffing system separately. Finally, numerical simulations are illustrated to verify the theoretical analysis according to the largest Lyapunov exponent and Poincaré map.     

基于积分观测器实现一类受扰混沌系统的同步

在系统参数和系统输出同时受扰的情形下,基于积分观测器的方法,实现了一类不确定混沌系统的同步.首先利用Lyapunov 稳定性理论,给出了混沌系统同步所需的充分条件,此条件可以快速地实现驱动系统与响应系统的同步,然后结合Schur补定理,将此条件转化为求解线性矩阵不等式组.最后,借助Matlab软件包中的LMI工具箱,通过对受扰MLC电路系统的同步数值仿真,证实了该方法的有效性.     

国外红外末制导子母弹、红外制导炮弹、炸弹的发展情况

一、前言光电技术是军队作战力量的倍增器,这一点在精确制导武器中得到了很好的证明。就反坦克武器而言,精确制导武器已经发展到了第三代。第一代指有线制导光学瞄准目视观察的反坦克导弹,这一代武器已经服役;第二代是指激光制导炮弹和导弹,目前已开始生产和装备部队;第三代则是具有“发射后不用管”能力的武     

关于气相色谱仪检定的几个问题

在对气相色谱仪进行检定的过程中,遇到了有关色谱柱,标准样品,积分仪和色谱数据工作站数据采集等实际问题,为了既不影响生产工艺分析任务的进行,又能及时完成对仪器性能的检定工作,采取了相应的措施和办法,较快地完成了对气相色谱仪的检定,并对某些测试数据进行了比较和讨论。     

一类带有未知参数的受扰混沌系统的观测器同步

在系统参数未知的情形下,观测器方法和自适应方法相结合,实现了一类受扰混沌系统的同步.借助于Lyapunov稳定性理论和Barbalat引理,给出了观测器的设计方法.此方法约束条件较少,适应于大部分常见的混沌系统.最后,通过对典型混沌系统的同步数值仿真,证实了方法的有效性和正确性. 关键词： 混沌系统 外界干扰 同步 观测器法     

Complete synchronization of uncertain chaotic dynamical network via a simple adaptive control

In this paper, based on the invaxiance principle of differential equations, we propose a simple adaptive control method to synchronize the network with coupling of the general form. Comparing with other control approaches, this scheme only depends on each node＇s state output. So we need not to know the concrete network structure and the solutions of the isolate nodes of the network in advance. In order to demonstrate the effectiveness of the method, a special example is provided and numerical simulations are performed. The numerical results show that our control scheme is very effective and robust against the weak noise.     

多源验前信息下的Bayes信息融合方法

本文以指数分布寿命型电子产品为例,讨论了多源验前信息情况下如何对产品失效率进行融合估计的问题。首先,介绍了寿命试验数据的信息融合方法,并以此为例,说明了取伽玛分布为指数分布寿命型产品失效率的先验分布的合理性。然后,在产品具有多源验前信息源的情况下,给出了一种方便实用的Bayes信息融合方法,充分融合各验前信息,得到产品失效率的验前分布及后验分布。最后给出了数值实例。