多传感器单模型动态系统多尺度分布式融合估计

近几年来,小波理论和信号的多尺度表示方法都得到了迅速发展,并在包括信号处理和图像处理在内的众多领域中得到了成功的应用,而在这些领域中,目前一个较为活跃的分支是基于小波变换的多尺度表示的统计信号处理。运用多尺度分析的思想,将基于模型的动态系统分析方法与基于统计特性的多尺度信号变换方法相结合,建立起状态基于多源观测信息的多尺度分布式融合估计和单源观测信息的多尺度分布式估计两种新算法,用计算机仿真研究验证了算法效能。     

Decomposition-Coordination Optimization of the Dynamic Systems with Adaptation of the Criterion

For optimization of the dynamic systems with decentralized control, a universal method based on adaptation of the performance index in the course of design was presented. For a large class of systems, computations were simplified and control noise-immunity improved.     

Program-Analytical Simulation of Problems for Distributed-Parameter Dynamic Systems

Basic mathematical and system aspects of a program-analytical system for modeling distributed-parameter dynamic systems are considered. Formulations of problems, their mathematical analysis, and user interface are proposed, which makes it possible to relate these problems to specific physical and engineering objects.The paper was sponsored by the State Fund for Basic Research of Ukraine.__________Translated from Kibernetika i Sistemnyi Analiz, No. 2, pp. 35–55, March–April 2005.     

A Robust Model Control for Dynamic Systems

Analytical methods of polynomial algebra, heuristic techniques, and digital modeling are used to study the robustness domain of linear dynamic systems with model input–output controllers as a function of the mutual locations of zeros and poles of the transfer function of the controlled object and poles of the characteristic polynomial. Conditions for parametric robustness are determined. A method of choosing the measured output coordinate of the automatic control system during structure formation from optimal-speed requirements is described.     

分数阶混沌系统的动态仿真方法研究

分数阶混沌系统是非线性科学的研究热点.由于目前研究分数阶混沌的理论和硬件实验分析方法比较烦琐,提出了分数阶混沌系统的动态仿真方法.通过利用分数阶微分算子及其复域表示方式设计分数阶微分算子仿真模块,根据分数阶系统方程构建分数阶混沌系统仿真模型,可动态地观察系统变量的演化规律,并利用仿真过程的输出数据分析分数阶混沌系统的动力学特性.研究结果表明分数阶混沌系统的动态仿真方法足一种有效的分析方法.     

一类非线性动态系统的数字仿真

针对工业控制中常见的一类非线性动态系统,本文提出了一种仿真算法,与其它同阶精度算法相比,具有精度高、稳定性好和计算量小等优点,文中给出了五个不同类型的仿真算例,结果表明,该算法是有效可行的。     

一种新颖的P2P文件共享系统的动力学模型

提出一种新颖的P2P文件共享系统的动力性学模型.在模型中定义了描述节点之间相互作用关系的状态量.同时,分析了P2P文件共享系统中最重要的算法,如节点选择算法及带宽分配算法等等,最终给出了模型的具体形式.最后,网络实验和仿真证明了此模型能够反映P2P文件共享系统的本质特征,从而为设计高性能P2P网络,改进现有的P2P算法,以及研究P2P系统的稳定性提供一种新颖的方法.     

混合动态系统的混合Petri网（HSPN）模型

针对混合动态系统,提出一种混合Ｐｅｔｒｉ网（ＨＳＰＮ）模型,分析了该模型具有的特点及其运行规则。以冶金加热炉为例,给出了该系统的ＨＳＰＮ模型。     

A Dynamic Inspection Model for Wearing Production Systems

The aim of this paper is to correlate the deterioration process of a production system with the items control process and, as a consequence, with the equipment inspection policy. The objective is to consider how the wear of the manufacturing system influences the values of the control process parameters and how these parameters have to be changed in accordance with the need to maintain optimal (working) conditions. Adopting a Weibull failure-time distribution, it is shown how these parameters must be changed (at different times t ) in order to maintain optimal working conditions. To test the inspection model, a weighted cost function dependent on the time loss for the production of defective units and for the production shut-down (in order to make an inspection to control the state of the system) is developed.     

Uniformly Effective Numerical Methods for Hyperbolic Systems

A unified method to compute compressible and incompressible flows is presented. Accuracy and efficiency do not degrade as the Mach number tends to zero. A staggered scheme solved with a pressure correction method is used. The equation of state is arbitrary. A Riemann problem for the barotropic Euler equations with nonconvex equation of state is solved exactly and numericaly. A hydrodynamic flow with cavitation in which the Mach number varies between 10⁻³ and 20 is computed. Unified methods for compressible and incompressible flows are further discussed for the flow of a perfect gas. The staggered scheme with pressure correction is found to have Mach-uniform accuracy and efficiency, and for the fully compressible case the accuracy is comparable with that of established schemes for compressible flows. Received October 20, 1999; revised May 26, 2000     

离散事件动态系统的混合状态模型

本文通过引入混合状态，使大部分ＤＥＤＳ成为时齐的混合状态马氏过程。然后用半群理论来研究该马氏过程，建立了有关半群算子的偏微分方程，并进一步把该方程转化为积分方程，并证明了积分方程有唯一解，解可由迭代法求出。     

动态系统模糊模型辨识及其自学习算法

提出一种规则模型辨识的自学习算法,并进行了实例验证,结果表明该算法具有较高的辨识精度,可用于模糊自适应控制系统中.     

用动态补偿法讨论奇异系统的强模型匹配问题*

讨论了一类非线性奇异系统的强模型匹配问题,在扩展结构算法的基础上,导出了该问题中解的充要条件,并给出适当的动态补偿控制器。     

A Unified Dynamic Model Formulation for Robotic Manipulator Systems

This paper addresses the problem of the formulation of a unified dynamic model for sundry robotic manipulator systems derived from the first principle of mechanics instead of the existing formulation based on linear separability principle. It provides a systematic derivation, evaluation, and subsequent conceptual interpretation of manipulator dynamics model. Further, it analyzes the generality of the unified model over a wide range of manipulator configurations. In addition, it describes the implementation aspects of the unified model. © 2003 Wiley Periodicals, Inc.     

一个新的面向对象数据库系统的动态数据模型

现有的OODBMS(object-oriented database management systems)的数据模型基本上可以分为两类:传统的强类型和非传统的弱类型.前者的特征是所有具有同样结构(模式)和行为(方法)的对象组成一个类,对象的含义由对象所属类的模式解释,故类的定义必须先于其对象的定义;后者的特征是“无模式”,即对象是“自我描述”的,因此无须为对象预先定义模式.指出了这两类模型的主要优缺点,并证实:为了充分适应有效而灵活的动态对象操作,有必要在传统的强类型模型和非传统的弱类型模型之间寻求某种折衷.为此,提出了一个基于概念聚类机制(conceptual clustering mechanism,简称CCM)的数据模型.这种新的动态模型已成功地应用于一个面向对象的VDBMS(video database management system).     

Convergence Acceleration for Hyperbolic Systems Using Semicirculant Approximations

The iterative solution of systems of equations arising from systems of hyperbolic, time-independent partial differential equations (PDEs) is studied. The PDEs are discretized using a finite volume or finite difference approximation on a structured grid. A convergence acceleration technique where a semicirculant approximation of the spatial difference operator is employed as preconditioner is considered. The spectrum of the preconditioned coefficient matrix is analyzed for a model problem. It is shown that, asymptotically, the time step for the forward Euler method could be chosen as a constant, which is independent of the number of grid points and the artificial viscosity parameter. By linearizing the Euler equations around an approximate solution, a system of linear PDEs with variable coefficients is formed. When utilizing the semicirculant (SC) preconditioner for this problem, which has properties very similar to the full nonlinear equations, numerical experiments show that the favorable convergence properties hold also here. We compare the results for the SC method to those of a multigrid (MG) scheme. The number of iterations and the arithmetic complexities are considered, and it is clear that the SC method is more efficient for the problems studied. Also, the MG scheme is sensitive to the amount of artificial dissipation added, while the SC method is not.     

Discrete Fundamental Solution Preconditioning for Hyperbolic Systems of PDE

We present a new preconditioner for the iterative solution of systems of equations arising from discretizations of systems of first order partial differential equations (PDEs) on structured grids. Such systems occur in many important applications, including compressible fluid flow and electromagnetic wave propagation. The preconditioner is a truncated convolution operator, with a kernel that is a fundamental solution of a difference operator closely related to the original discretization. Analysis of a relevant scalar model problem in two spatial dimensions shows that grid independent convergence is obtained using a simple one-stage iterative method. As an example of a more involved problem, we consider the steady state solution of the non-linear Euler equations in a two-dimensional, non-axisymmetric duct. We present results from numerical experiments, verifying that the preconditioning technique again achieves grid independent convergence, both for an upwind discretization and for a centered second order discretization with fourth order artificial viscosity.     

A Link-Node Discrete-Time Dynamic Second Best Toll Pricing Model with a Relaxation Solution Algorithm

Dynamic congestion pricing has become an important research topic because of its practical implications. In this paper, we formulate dynamic second-best toll pricing (DSBTP) on general networks as a bilevel problem: the upper level is to minimize the total weighted system travel time and the lower level is to capture motorists’ route choice behavior. Different from most of existing DSBTP models, our formulation is in discrete-time, which has very distinct properties comparing with its continuous-time counterpart. Solution existence condition of the proposed model is established independent of the actual formulation of the underlying dynamic user equilibrium (DUE). To solve the bilevel DSBTP model, we adopt a relaxation scheme. For this purpose, we convert the bilevel formulation into a single level nonlinear programming problem by applying a link-node based nonlinear complementarity formulation for DUE. The single level problem is solved iteratively by first relaxing the strick complementarity by a relaxation parameter, which is then progressively reduced. Numerical results are also provided in this paper to illustrate the proposed model and algorithm. In particular, we show that by varying travel time weights on different links, DSBTP can help traffic management agencies better achieve certain system objectives. Examples are given on how changes of the weights impact the optimal tolls and associated objective function values.

享有批量折扣的库存系统的动态仿真模型

基于离散事件系统仿真原理，建立了享有批量价格折扣的随机性库存系统动态仿真模型，从而可用计算机仿真技术来选定最佳存贮策略。