考虑腐蚀因素的船体结构寿命预测方法

为建立考虑腐蚀因素的船体结构寿命预测方法,在分析现有常用的船体结构腐蚀损伤时变模型的基础上,根据舰船维修保障实际情况建立了考虑腐蚀防护系统作用时间和维修时间等因素的腐蚀时变模型。根据相关规范选择了船体结构腐蚀寿命标准,并建立了一种计算船体结构腐蚀寿命的方法。该方法建立了船体结构腐蚀寿命与腐蚀防护系统作用时间和修理时间等因素之间的量化关系,可以用于预测均匀腐蚀条件下船体结构寿命,也可以反过来指导腐蚀防护系统设计指标的选择和船体结构维修策略的确定。     

装备表面现代维修保养技术研究

结合装备表面智能维修保养技术方面的研究成果,介绍了装甲装备故障智能检测技术、自适应、自修复功能材料,装甲装备器材全自动保养设备等先进技术,侧重装备维修保养阐述了如何提高信息化程度,推进军队武器装备维修保养技术的现代化建设。     

Transient analysis of Markov models of fault‐tolerant systems with deferred repair using split regenerative randomization

The (standard) randomization method is an attractive alternative for the transient analysis of continuous time Markov models. The main advantages of the method are numerical stability, well‐controlled computation error, and ability to specify the computation error in advance. However, the fact that the method can be computationally very expensive limits its applicability. In this paper, we develop a new method called split regenerative randomization, which, having the same good properties as standard randomization, can be significantly more efficient. The method covers reliability‐like models with a particular but quite general structure and requires the selection of a subset of states and a regenerative state satisfying some conditions. For a class of continuous time Markov models, model class C₂, including typical failure/repair reliability‐like models with exponential failure and repair time distributions and deferred repair, natural selections are available for both the subset of states and the regenerative state and, for those natural selections, theoretical results are available assessing the efficiency of the method in terms of “visible” model characteristics. Those results can be used to anticipate when the method can be expected to be competitive. We illustrate the application of the method using a large class C₂ model and show that for models in that class the method can indeed be significantly more efficient than previously available randomization‐based methods. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

Some aspects in estimating warranty and post‐warranty repair demands

When customers buy a product, they are often eligible for free repairs for a certain warranty period. In this article, we study some important aspects, which are often overlooked in the literature but are of interest to the manufacturer, in estimating both warranty and post‐warranty repair demands. We consider that the installed base of the product (i.e., the number of units of the product actually in use) varies with time due to both new sales and units being taken out of service. When estimating warranty and post‐warranty repair demands, we explicitly address the fact that customers may not always request repairs for failed units. For the case where the product failure time distribution is exponential, we derive the closed‐form expressions for both types of repair demands of a single unit and of the time‐varying installed base. The insights into some risk‐related quantities are also presented. Furthermore, the proposed model is extended by considering delayed warranty claims that are frequently seen in practice. Numerical examples illustrate that understanding both types of repair demands and the related decision variables is important for managing the obligatory and profitable repair services. © 2013 Wiley Periodicals, Inc. Naval Research Logistics 60: 499–511, 2013     

石油钻杆接头螺纹的数控修复加工系统

分析了石油钻杆接头螺纹数控修复加工的关键问题.提出了工件的寻位算法和加工余量的自动分配方法,介绍了刀具路径的动态校正方法,解决了工件不定位的情况下进行数控加工的问题.在此基础上,建立了石油钻杆接头螺纹的数控修复加工系统.     

海湾战争与舰船维修

在论述舰船战时雏修保障重要作用的基础上,总结了美海军在海湾战争中实施战前检修及战时抢修的基本活动和经验,提出了我军舰船战时维修保障建设的基本思路及措施。     

战时装甲装备修理任务划分标准的探讨

介绍了战时装甲装备的各级修理机构,给出了战时装甲装备修理任务的划分标准,描述了修理对象的分布规律——艾拉姆咖(Эрланга)分布的分布函数和概率密度函数。在此基础上,计算得到了战损某型坦克进入各级修理机构的概率,通过对比分析,发现我军修理任务的划分存在不合理性,俄军修理任务的划分比较科学,建议采用俄军修理任务的划分标准。     

21世纪设备维修工程的新进展一再制造工程

随着21世纪的来临,制造与维修工程越来越趋于统一。未来的制造与维修工程将考虑设备和零部件设计、制造和运行的全过程,是一个以优质、高效、节能、节材为目标的系统工程。再制造工程是国外新兴的产业领域,是先进制造技术的重要组成都分,也是先进制造技术的重要补充和发展。再制造技术充分利用各种先进表面工程和其它成型技术,制成再制造毛坯,形成再制造产品,是具有重大实用价值和优质、高效、少污染的绿色制造技术。     

战场损伤评估与修复分析及应用

本文根据我国国情和我军实践,论述了武器装备战场损伤评估与修复(BDAR)的基本概念、原理、分析程序及方法,提出了进行BDAR分析、制定HDAR大纲等一系列实际应用问题。     

注胶修复工艺的耐高温环氧树脂体系工艺性能

针对注胶修复工艺要求,采用差示扫描量热法热分析和流变仪测试三种中温固化配方的耐高温缩水甘油胺型环氧树脂体系的固化特性和化学流变特性,通过对比分析三种配方树脂体系的固化条件和黏度特性,确定MF-4101/ZH110/DMP-30树脂体系为最适宜注胶修复工艺的配方。建立该树脂体系在等温条件下黏度特性曲线的Daul Arrhenius模型和高阶指数拟合模型。结果表明,高阶指数拟合模型的预测精度和适用范围均优于Daul Arrhenius模型,预测黏度与实验结果具有良好的一致性,根据高阶指数拟合模型建立的黏度随温度、时间变化的唯象关系式,可以准确地预报修复树脂体系的工艺窗口。