一种基于定期检测的导弹可靠度计算方法

基于导弹的定期检测模式,对导弹部件检测维修方式进行了分类,建立了导弹贮存可靠度模型,运用极大似然估计和牛顿迭代原理进行估计。通过实例分析进行了检验并与Bayes估计对比,结果表明,该计算方法简单实用,满足可靠性要求,适合战训人员和工程技术人员在工程中实际运用。     

网络行为建模环境的实现及网络混沌性状分析

设计并实现了一种用于网络行为研究的网络行为建模环境，将网络环境的监测功能和网络行为的分析功能相互结合，为网络系统行为的研究奠定了基础。在这一环境下，归纳了四种有普遍意义的网络突发流量模型，并用混沌分形理论中的迭代函数系统和相空间重构方法对它们进行描述、分析、计算和重构，得到了它们的分形维以及能体现网络流量行为特性的宏观参数。     

深空可见光图像中弱小运动目标实时检测

 针对深空可见光图像背景特征与目标特性,提出了迭代质心的方法自适应地搜索恒星灰度质心作为特征点并构造基于恒星空间分布的特征模型,实现亚像素级精度的图像序列配准,通过8-邻域联通聚类分析的路径判别法,解决了弱小运动目标实时检测.     

清洗级联分离同位素的过程中沉积物物质分布的计算方法

在级联分离同位素的过程中,某些分离工质会在级联内发生化学反应,持续产生少量的固体物质沉积在分离设备内.随着沉积物的增加,将逐步影响分离设备的分离性能,进而影响级联的生产运行,因此需要定期对沉积物进行清理.本文针对清理过程,提出一种数值计算方法,用于级联内不同气态物质分布规律的计算.该算法在单机清理参数已知的前提下,以级...     

任意初态下的工业机器人迭代学习控制

对迭代初值为任意值的工业机器人轨迹跟踪控制系统,提出了一种基于滑模面的非线性迭代学习控制算法,使机器人轨迹能快速、精确跟踪上期望轨迹.基于有限时间收敛原理,构建了关于机器人轨迹跟踪误差的迭代滑模面,在滑模面内,机器人轨迹跟踪误差在预定时间内收敛到零.设计了基于滑模面的迭代学习控制算法,理论证明了随着迭代次数的增加,处于...     

半挂式车辆自主驾驶的轨迹跟踪控制研究

该文针对半挂式车辆的自主驾驶,设计一种基于迭代线性二次型调节器(iLQR)的轨迹跟踪控制器.通过深入研究转向过程中半挂式车辆的运动,建立满足非完整性约束的非线性车辆运动学模型,并根据期望轨迹对其进行线性化,得到线性的轨迹跟踪误差模型.基于扩展卡尔曼滤波器设计车辆状态观测器,估计车辆的航向角.通过对期望轨迹进行基于三次B...     

Frequency domain analysis of acoustic wave propagation in heterogeneous media considering iterative coupling procedures between the method of fundamental solutions and Kansa's method

Acoustic wave propagation in heterogeneous media is a topic of significant interest in many areas of science and engineering, including aeroacoustics and sound propagation in oceans. In the present work, numerical frequency domain models based on the joint use of the method of fundamental solutions and of the radial basis function collocation method (also known as Kansa's method) are discussed. In this context, the method of fundamental solutions is used to model the homogeneous part of the propagation domain, while Kansa's method is employed to model the presence of heterogeneities. The coupling between the two parts of the propagation domain is performed iteratively, allowing independent spatial discretization between the different subdomains of the model (i.e. matching collocation points at common surfaces are not necessary). Additionally, an optimised algorithm, based on the use of a varying relaxation parameter, is employed to speed up and/or to ensure the convergence of the iterative coupling process. At the end of the paper, numerical results illustrate the applicability and potentialities of the proposed formulations. Copyright © 2011 John Wiley & Sons, Ltd.     

A stencil of the finite-difference method for the 2D convection diffusion equation and its new iterative scheme

The paper gives the numerical stencil for the two-dimensional convection diffusion equation and the technique of elimination, and builds up the new iterative scheme to solve the implicit difference equation. The scheme's convergence and its higher rate of convergence than the Jacobi iteration are proved. And the numerical example indicates that the new scheme has the same parallelism and a higher rate of convergence than the Jacobi iteration.     

Some iterative algorithms for the obstacle problems

In this paper we propose some iterative algorithms for the obstacle problems discretized by the finite difference method. We rewrite the obstacle problem to an equivalent complementarity problem. We use the regularization trick to non-smooth absolute function. Then we apply the Newton's method to obtain an iterative algorithm. Some other two algorithms based on this algorithm are derived. Numerical experiments show the effective of the algorithm.     

Common fixed points of a countable family of multivalued quasi-nonexpansive mappings in uniformly convex Banach spaces

In this paper, we introduce a one-step iterative scheme for finding a common fixed point of a countable family of multivalued quasi-nonexpansive mappings in a real uniformly convex Banach space. We establish weak and strong convergence theorems of the proposed iterative scheme under some control conditions.