舰船武备系统故障诊断算法的探讨

本文以舰炮系统为主,论述了舰船武备系统在诊断中常用算法的基本原理及其特点,并指出今后进行理论研究的一些可行的途径。     

Locating a target from directional data

Statistical estimation plays an important role in locating a target in space, a task that has important applications in many areas. However, theoretical measures on the quality of various estimators reported in the literature have been difficult to obtain because of mathematical complications. As a result, choice of estimator in practice has been largely arbitrary. In this paper, we present a systematic study on major target estimators reported in the literature. Focus is on comparisons between the traditional angle method, the line method, and a recently developed line-to-point transformation method. Insights gained from the study directly lead to the development of a novel two-stage angle method that not only produces highly accurate target estimation among all known estimators but is also computationally efficient. © 1998 John Wiley & Sons, Inc. Naval Research Logistics 45: 353–364, 1998     

Single machine sequencing with linear models of release dates

The paper deals with a problem of scheduling a set of jobs on a single machine. Before a job is released for processing, it must undergo some preprocessing treatment that consumes resources. It is assumed that the release date of a job is a linear decreasing continuous function of the amount of a locally and globally constrained, continuously divisible resource (e.g., energy, catalyzer, financial outlay, gas). The problem is to find a sequence of jobs and a resource allocation that will minimize the maximum job completion time. Such a problem appears, for example, in the ingot preheating and hot-rolling process in steel mills. It is shown that the problem is strongly NP-hard. Some polynomially solvable cases of the problem and approximate algorithms with both experimental and worst-case analysis are presented. © 1998 John Wiley & Sons, Inc. Naval Research Logistics 45: 99–113, 1998     

基于装备水平和知识的空中作战效果分析

分析了按作战效果进行空军武器装备需求分析的三种常用方法的特点,建立了一种全自动化解算模型,比较完整地讨论并描述了根据装备水平分析作战效果时需要考虑的关键因素,总结了需要使用的相关军事知识,并给出了表达方法,研究了推理机制.构建了各种战斗类型的效果评估模块,实现了软件系统并应用于一个重要课题研究,取得了比较理想的效果.     

基于故障树分析的航空装备体系结构贡献率评估方法

针对航空装备体系构成复杂的特点,将故障树分析引入航空装备体系结构贡献率评估问题,提出基于故障树分析的评估方法.从作战装备、信息支援装备和保障装备三个方面构建航空装备体系结构,建造航空装备体系结构故障树;采用底事件的关键重要度指标来计算航空装备的体系结构贡献率,建立基于关键重要度的航空装备体系结构贡献率评估模型;以某航空...     

美军装备试验鉴定发展历程分析及启示

美军装备试验经历近百年的发展,已形成较为成熟的试验鉴定模式和管理评价体制,试验鉴定能力也处于世界领先水平.美军在装备发展历程中的经验做法十分值得学习和借鉴.本文分析了美军装备试验鉴定发展历程和特点,研究了其试验组织结构的科学构成和运行机制,归纳总结了美军装备试验发展的客观规律和科学经验.在此基础上,得到了顺应装备发展趋...     

IC卡技术在器材保障信息管理中的应用

主要就IC卡技术在我军器材保障信息管理中的初步应用,阐述了基于IC卡技术的便携式器材保障信息系统的特点和系统组成方案,并介绍了实现这种系统方案的关键技术.     

基于测试码并行的同步时序电路故障模拟方法

将组合电路故障模拟的一些加速技术推广到时序电路故障模拟中,提出并实现了一个功能块级的基于测试码并行的同步时序电路故障模拟方法,对部分ISCAS89 Benchmark电路的模拟结果表明,该故障模拟方法有较好的性能.     

基于旁支式次级源的舰船液压管路低频脉动有源衰减

舰船液压系统的低频脉动伴随流体沿管路传递,产生结构振动的线谱。针对难以通过被动式衰减的低频脉动,设计旁支式次级源,进行有源衰减的研究。所设计的旁支式次级源采用压电陶瓷驱动,结构紧凑且增加了放大结构,从而提高了响应特性。搭建液压管路的有源控制系统,采用FxLMS自适应算法,进行多线谱脉动的控制实验。实验结果表明,旁支式次级源能够对多线谱低频脉动进行有效衰减,减小随流体传递的振动能量,且对原液压系统工作性能无影响。     

运动流体介质和剪切层共同作用下平面近场声全息技术改进

传统的平面近场声全息将全息面置于射流内部。为了降低窗效应和卷绕误差对重建精度的不利影响,一般要求全息面尺寸为声源的2倍以上,而较大尺寸的传声器阵列放在射流内部会干扰射流的稳定。针对这一问题,提出将整个全息面置于射流外部的方法。根据经典的剪切层修正理论,首先分析声波由声源传播至全息面过程中路径和幅值的改变,继而推导出修正后的声场传播公式,最终建立起马赫数小于0.3的运动流体介质和剪切层共同作用下的平面近场声全息理论模型。数值仿真表明,改进后的平面近场声全息技术能够得到高分辨率的重建声场,对气动噪声源的定位精度较高,并且具备一定的抗干扰能力。