对目标打击概率的数学模型及分析

通过分析识别跟踪攻击目标的过程,建立了攻击目标打击概率的数学模型和基本算法,通过计算机采用蒙特卡罗法模拟计算了不同条件下对目标的打击概率,以此研究影响打击概率的因素.计算结果表明,武器系统的作战半径和威力半径两个因素对打击概率影响较大,误差因素在一定范围内影响较小,各参数之间存在优化匹配的空间.     

舰炮大型铸铝件断裂残余应力分析

采用盲孔法测试某型舰炮大型铸铝件残余应力,结果分析表明原结构中残余应力较大,部分位置残余应力超过材料屈服极限是其断裂的根本原因.通过工艺改进后,构件残余应力幅值大幅降低,满足工程要求.     

Mean residual life of coherent systems consisting of multiple types of dependent components

Mean residual life is a useful dynamic characteristic to study reliability of a system. It has been widely considered in the literature not only for single unit systems but also for coherent systems. This article is concerned with the study of mean residual life for a coherent system that consists of multiple types of dependent components. In particular, the survival signature based generalized mixture representation is obtained for the survival function of a coherent system and it is used to evaluate the mean residual life function. Furthermore, two mean residual life functions under different conditional events on components’ lifetimes are also defined and studied.     

Determination of burn‐in parameters and residual life for highly reliable products

Today, many products are designed and manufactured to function for a long period of time before they fail. Determining product reliability is a great challenge to manufacturers of highly reliable products with only a relatively short period of time available for internal life testing. In particular, it may be difficult to determine optimal burn‐in parameters and characterize the residual life distribution. A promising alternative is to use data on a quality characteristic (QC) whose degradation over time can be related to product failure. Typically, product failure corresponds to the first passage time of the degradation path beyond a critical value. If degradation paths can be modeled properly, one can predict failure time and determine the life distribution without actually observing failures. In this paper, we first use a Wiener process to describe the continuous degradation path of the quality characteristic of the product. A Wiener process allows nonconstant variance and nonzero correlation among data collected at different time points. We propose a decision rule for classifying a unit as normal or weak, and give an economic model for determining the optimal termination time and other parameters of a burn‐in test. Next, we propose a method for assessing the product's lifetime distribution of the passed units. The proposed methodologies are all based only on the product's initial observed degradation data. Finally, an example of an electronic product, namely contact image scanner (CIS), is used to illustrate the proposed procedure. © 2002 Wiley Periodicals, Inc. Naval Research Logistics, 2003     

Properties of a mean residual life function arising from renewal theory

The present article discusses the properties of the mean residual life function in a renewal process. We examine the relationship this function has with the failure rate function and the conventional mean, variance and coefficient of variation of residual life. We also discuss some monotonicity properties of the mean residual life function. A partial order based on the renewal mean residual function is introduced along with its interrelationship with some existing stochastic orders. © 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010     

捷联惯导系统快速自对准误差模型的建立

通过对惯性制导系统两个基本方程的研究,求出了各状态矢量在各坐标系下的微分方程,然后以ψ角法所确立的平台为基准,分别推导得出惯性制导系统各主要状态的微分方程,从而建立了捷联惯性制导系统的误差模型.最后根据静基座捷联惯导系统初始对准的特点对其进行简化,得到了静基座捷联惯导系统快速自对准的误差模型.     

横向效应增强型弹垂直侵彻薄靶的轴向剩余速度理论分析

为了得到横向效应增强型弹（Penetration with Enhanced Lateral Efficiency projectile, PELE）对金属薄靶垂直侵彻后的弹体轴向剩余速度，运用平面冲击波理论，对PELE的侵彻机理进行分析。参照平头弹体对靶板的侵彻模型，将PELE侵彻过程中的能量损失划分为以下几个部分：外壳体和内芯撞靶区域对应的环形塞块获得的能量、冲击波作用下弹体的内能增量以及剪切耗能等。然后根据能量守恒原理，得到PELE垂直侵彻金属薄靶后的PELE弹体轴向剩余速度的理论模型。为了验证该模型的合理性和准确性，设计相应的试验进行验证。结果表明，不同条件下得到的试验结果和理论模型得到的计算结果均吻合得较好。因此，得到的PELE垂直侵彻薄靶的轴向剩余速度理论模型可为工程应用提供指导和参考。     

控制棒及其传动装置模拟的误差分析

从建立数学模型入手 ,对控制棒及其传动装置模拟环节所产生的误差情况进行了定量的理论分析 ,并对误差产生的原因、处理的方法提出了意见     

带混合误差的Ishikawa迭代格式

将Ishikawa型迭代格式的收敛性问题推广到带混合误差的Ishikawa型迭代格式的情形 ,同时所用的证明方法和技巧有所改进     

火炮随动系统射击试验射弹数的自动控制

针对火炮随动系统射击试验中射击时机和射弹数难于人工控制的特点 ,讨论了利用火炮随动测试系统进行自动控制的可行性 ,分析了射弹数自动控制的误差。