模糊论的复杂系统评价方法

模糊综合评价法对复杂系统进行评价具有其他评价方法无法比拟的优越性.介绍了模糊评价的基本原理及其数学模型,给出了复杂系统的模糊矩阵的表示方法及推理过程.重点分析了其在某型垂直/短距飞行器设计中的应用,证明了该方法在系统评价中的有效性.该方法可以有效地对复杂系统进行评价并对系统的设计有一定的指导意义.     

On a class of multiple failure mode systems

The primary objective of this work is to introduce and perform a detailed study of a class of multistate reliability structures in which no ordering in the levels of components' performances is necessary. In particular, the present paper develops the basic theory (exact reliability formulae, reliability bounds, asymptotic results) that will make it feasible to investigate systems whose components are allowed to experience m ≥ 2 kinds of failure (failure modes), and their breakdown is described by different families of cut sets in each mode. For illustration purposes, two classical (binary) systems are extended to analogous multiple failure mode structures, and their reliability performance (bounds and asymptotic behavior) is investigated by numerical experimentation. © 2002 Wiley Periodicals, Inc. Naval Research Logistics 49: 167–185, 2002; DOI 10.1002/nav.10007     

CPN在海上防空建模中的应用

着色 Petri网 (CP-网或 CPN )是一种面向图形的语言 ,用来设计、说明、模拟和验证系统。尤其适用于通信系统等同步和资源共享占有重要地位的系统。在通信协议、分步式系统、嵌入系统、自动生产系统、工作流分析、VL SI芯片等方面都有典型的应用。本文简单介绍了 CPN的发展过程和基本原理 ,重点就 CPN在海上防空系统建模仿真中的应用进行了探讨     

单输入不确定系统离散变结构控制

研究单输入不确定离散时间系统的变结构控制设计问题.提出一种新形式的离散趋近律,它具有良好的动、静态特性,可有效消除由传统离散趋近律参数引起的抖振.设计扰动预估器以补偿不确定因素的影响,从而提高系统鲁棒性并进一步减弱抖振.仿真结果表明了所提设计方法的有效性.     

The value of information sharing in a two‐stage supply chain with production capacity constraints

We consider a simple two‐stage supply chain with a single retailer facing i.i.d. demand and a single manufacturer with finite production capacity. We analyze the value of information sharing between the retailer and the manufacturer over a finite time horizon. In our model, the manufacturer receives demand information from the retailer even during time periods in which the retailer does not order. To analyze the impact of information sharing, we consider the following three strategies: (1) the retailer does not share demand information with the manufacturer; (2) the retailer does share demand information with the manufacturer and the manufacturer uses the optimal policy to schedule production; (3) the retailer shares demand information with the manufacturer and the manufacturer uses a greedy policy to schedule production. These strategies allow us to study the impact of information sharing on the manufacturer as a function of the production capacity, and the frequency and timing in which demand information is shared. © 2003 Wiley Periodicals, Inc. Naval Research Logistics, 2003     

QFT在飞机纵向着陆控制中的应用

飞机进场着陆是飞机飞行的关键阶段,由于飞机和外界条件存在许多不确定因素,对飞机着陆精度和安全性有很大影响。QFT是在相频平面上的一种图形化的鲁棒控制系统设计方法。采用QFT理论设计了某型飞机的纵向着陆控制律,并应用了推力综合控制稳定飞机下滑时的速度。仿真结果显示,飞机着陆实现了对期望着陆轨迹的精确跟踪,满足了着陆控制的要求。     

一类两种群竞争离散系统的持久性

讨论了密度制约的两种群竞争离散系统{x（n＋1）=x（n）exp｜r1-a1x（n）-b1y（n）｜ y（n＋1）=y9n）exp｜r2-a2x（n）-b2y（n）｜的初值解的有界性及系统的持久性。通过适当构造解的最终有界区域,证明了当b1/b2〈r1/r2/〈a1/a2时,系统是强持续生存的。这里ri,ai,bi（i=1,2）均为正的常数。     

基于联合作战能力的装备体系需求生成过程研究

针对武器装备建设过程中需求不够明确、不够准确和不够科学的现状,从联合作战的角度出发,以“基于能力”的武器装备建设思想为指导,对“任务体系→能力体系→装备体系”的装备体系需求生成过程进行了深入研究,并与传统装备体系需求生成过程进行了比较。     

A two‐echelon inventory‐location problem with service considerations

We study the problem of designing a two‐echelon spare parts inventory system consisting of a central plant and a number of service centers each serving a set of customers with stochastic demand. Processing and storage capacities at both levels of facilities are limited. The manufacturing process is modeled as a queuing system at the plant. The goal is to optimize the base‐stock levels at both echelons, the location of service centers, and the allocation of customers to centers simultaneously, subject to service constraints. A mixed integer nonlinear programming model (MINLP) is formulated to minimize the total expected cost of the system. The problem is NP‐hard and a Lagrangian heuristic is proposed. We present computational results and discuss the trade‐off between cost and service. © 2009 Wiley Periodicals, Inc. Naval Research Logistics 2009