子母弹子弹引信爆炸物处理安全性研究

子母弹药的应用与发展带来了严重的未爆弹药问题。初步建立了评定未爆弹药危险性的数学模型,并从该模型出发,详细探讨了子弹引信爆炸物处理安全性的设计途径,以尽可能消除未爆弹药隐患。     

Requirements planning for modular products

The focus of this paper is on determining the requirements of different component options of a modular end‐product in an uncertain environment. We explicitly model two distinct sources of uncertainty: stochastic end‐product demand and unknown market proportions for the different product options available. Our cost minimizing model focuses on determining the optimal requirements policies for component options that meet a pre‐set service level. We show that simple common‐sense requirements policies are not generally optimal; there is a non‐linear connection between service level and component requirements that is hard to characterize without a detailed analysis. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

Reliability and mean residual life functions of coherent systems in an active redundancy

In this article, the reliability and the mean residual life (MRL) functions of a system with active redundancies at the component and system levels are investigated. In active redundancy at the component level, the original and redundant components are working together and lifetime of the system is determined by the maximum of lifetime of the original components and their spares. In the active redundancy at the system level, the system has a spare, and the original and redundant systems work together. The lifetime of such a system is then the maximum of lifetimes of the system and its spare. The lifetimes of the original component and the spare are assumed to be dependent random variables. © 2017 Wiley Periodicals, Inc. Naval Research Logistics, 64: 19–28, 2017     

航天器推进系统模块化建模方法

为了研究由复杂增压气路和推进剂供应管路组成的航天器推进系统的动力学问题,基于AMESim软件平台,构建了模块化、可扩展的航天器推进系统仿真模型UPSSim.模型中,增压气路采用分段集中参数模型,推进剂供应管路采用分布参数模型,并考虑了系统各组件与环境的换热.对某型轨控发动机的变轨过程进行了仿真,UPSSim能准确模拟该发动机变轨过程中系统参数的变化,计算结果与设计性能参数、飞行遥测数据吻合较好.仿真结果表明,本文所采用的模块化建模与仿真方法适用于复杂管网的建模,在航天器推进系统仿真建模与仿真领域具有较好的应用前景.     

Unpacking the various meanings of redundancy: from refining the concept to military planning

The authors engage in the debate over waste in military force structure planning by rigorously deconstructing the concept of “redundancy.” First, a typology of redundancy is constructed that provides a common framework for identifying variety among redundant structures. These are labeled “true redundancy,” “expanded capacity,” “portfolio diversification,” and “mission overlap.” Further, a number of mechanisms are identified that produce these types of structures, and show the conditions under which planners may utilize redundant structure in the search for optimization. In sum, the article provides refined concepts for analysts and planners to identify when redundancy is deleterious or beneficial.     

Clustering in defence-related procurement: the case of a Belgian naval construction cluster

ABSTRACT

This paper examines the importance of closer co-operation in defence-related procurement. Led by the decision that Belgium will lead the procurement of 12 Mine CounterMeasures Vessels (MCMV), the case of a potential Belgian naval construction cluster is discussed. The feasibility of a potential cluster is investigated by looking at key elements of a successful naval construction cluster, the Dutch naval construction cluster, and comparing those key elements to the current Belgian situation. Forming a sustainable Belgian naval construction cluster will be difficult. Most of the procurement process of the MCMVs is set on a European tender. In the long run, due to the absence of both a launching customer and leader firms, no party is able to carry the cluster with investments and knowledge spill-overs. In order to keep public support for large defence-related investments, clustering around the MCMV integration system and proactive cluster support is recommended.     

蒸汽动力装置分布式控制系统可靠性设计准则

讨论了为保证蒸汽动力装置分布式控制系统的可靠性所采取的一般技术 ,详细分析了提高蒸汽动力装置分布式控制系统可靠性的一般设计准则 ,包括系统设计的一般要求、计算机的选型、元器件的选择与使用以及抗干扰措施     

基于冗余管理的水下航行器深度容错控制方法

随着海洋开发的日益增加,水下航行器的研究也进入了快速发展阶段,如何保证航行器在水下恶劣环境中可靠工作成为急待解决的问题,尤其对于超远航程和超长航时的航行器,其航行过程中难免会发生意外错误,因此在保证性能的同时,如何提高水下航行器的容错能力成为近年来研究的一个热点问题.提出了一种基于冗余管理(Redundancy Management)理论的水下航行器容错控制方案,方案有效利用了航行器中各传感器的冗余性,减少了硬件设备的增加,降低了成本,并利用有限元状态机方法进行了Matlab程序仿真,结果表明,整个方案设计合理,容错控制律真正达到了"容错控制"的目的.     

不同故障模式下的可靠性优化问题

以阀门流体系统为例 ,通过理论分析与数值计算 ,讨论了组成单元具有多个故障模式情形的系统可靠性优化问题 ,对传统的冗余技术作了进一步的发展 ,确立了考虑不同故障模式时可靠性优化的一般模型 ,最后得到了必须根据不同故障模式比率确定配置方式的结论     

低开销的软错误免疫寄存器设计

随着工艺尺寸的逐渐缩小,集成电路中由放射性粒子引起的软错误不断增加,在设计时必须考虑由软错误引起的可靠性问题.使用软错误免疫寄存器对电路敏感部分选择性加固是降低逻辑电路软错误率简单有效的方法.总结了常用的软错误免疫寄存器结构,并使用可靠性分析方法对8种寄存器进行量化研究和比较,得出双模时空冗余寄存器具有更高的可靠度;针对现有可靠寄存器开销较大的缺点,设计了一种基于时钟延时的动态主级时空双模冗余寄存器--DMTS-DR,不仅能很好地免疫自身的SEU,还能对前级组合逻辑的SET进行有效屏蔽.与其它可靠寄存器相比,DMTS-DR的面积和延时开销都有大幅降低,在可靠性、面积和速度间实现了较好的折中.