使用与维修工作分析与保障资源需求确定

详细描述了使用与维修工作分析、保障设备需求确定、备品备件需求确定、技术资料内容确定、人员与技术等级需求确定的主要内容及使用与维修工作分析与保障资源需求确定之间的关系,为在研制阶段确定出保障资源提供一种科学而适用的方法.     

影响武器装备维修质量的基本要素分析

制约、影响维修质量的因素是多方面的.从武器装备系统的全寿命过程出发,将影响维修质量的基本要素概括为7个方面即维修人员素质、维修设备与设施的状况、装配工艺、维修生产环境、原材料、备品备件的质量、维修管理制度等.通过具体研究、分析影响维修质量的这些因素及其特征量,指明这是实现维修质量管理和评定目标的必经之路,只有影响因素明确了,才能有的放矢地对维修质量进行管理、控制与评定.     

老年建筑防火设计

针对老年建筑在消防方面给我们提出的新课题,介绍人口老龄化和老年建筑的基本情况,分析老年建筑的消防特点,并着重对老年建筑防火设计的若干问题进行探讨.     

城市饮用水水质安全分析

运用系统工程理论识别了影响我国城市饮用水水质安全的主要因素及其相对重要度,有针对性地探讨了城市饮用水水质安全保障的策略与措施。结果表明:尽管影响城市饮用水水质安全的因素众多,但最重要的行为主体是政府,关键的环节是水源保护。在建构城市饮用水水质安全保障体系时,各级政府应采取经济手段、行政手段等多种配套措施,既全面系统地考虑所有影响因素,又针对不同的时间和区域进行污染环节(尤其是水源保护)和污染物的重点控制。     

紧固件自动拆装过程仿真的设计方法研究

介绍了一种在AUTOCAD环境下,用参数化造型法,实现紧固件拆装过程自动仿真的设计方法.该方法把维修工具及紧固件的设计、工具维修性力学分析,以及维修过程的图形仿真合成在一起.工具及紧固件可以在给定点自动实现三维造型,并可连续进行过程仿真;当施加在紧固件上的外力超过其规定的受力范围时,将以图形方式自动显示,帮助操作者对维修操作过程进行判断.     

基于仿真的装备维修保障力量配置优化

装备维修保障力量的优化配置对于充分发挥维修保障效益、提高装备完好率具有重要意义。在分析界定装备维修保障力量配置问题的基础上,采用通用仿真语言建立了支持分析决策的仿真模型。实例分析表明维修力量最优配置是各区域的故障装备产生速率、后送运输时间等方面因素综合作用的结果,仿真程序可反映各项因素的定量关系。     

Maintaining systems with heterogeneous spare parts

We consider the problem of optimally maintaining a stochastically degrading, single‐unit system using heterogeneous spares of varying quality. The system's failures are unannounced; therefore, it is inspected periodically to determine its status (functioning or failed). The system continues in operation until it is either preventively or correctively maintained. The available maintenance options include perfect repair, which restores the system to an as‐good‐as‐new condition, and replacement with a randomly selected unit from the supply of heterogeneous spares. The objective is to minimize the total expected discounted maintenance costs over an infinite time horizon. We formulate the problem using a mixed observability Markov decision process (MOMDP) model in which the system's age is observable but its quality must be inferred. We show, under suitable conditions, the monotonicity of the optimal value function in the belief about the system quality and establish conditions under which finite preventive maintenance thresholds exist. A detailed computational study reveals that the optimal policy encourages exploration when the system's quality is uncertain; the policy is more exploitive when the quality is highly certain. The study also demonstrates that substantial cost savings are achieved by utilizing our MOMDP‐based method as compared to more naïve methods of accounting for heterogeneous spares.     

封面

通过求解零初始速度下的无控相对运动距离最小值,分析了圆参考轨道下航天器近距离相对悬停的被动安全特性。航天器相对悬停的被动安全特性可描述为处于受控悬停状态的航天器在控制力消失后的相对运动轨迹与目标禁飞区之间的空交集状态,该问题可转换为求解零初始速度下的相对运动距离最小值。由于初始位置的不同,相对距离最小值点可能位于整数倍周期极小值或非整数倍周期极小值点,通过分析两种类型极小值点的存在条件以及极小值点为最小值点的分界条件得到临界被动安全悬停区域的计算方法。针对典型的相对悬停场景,仿真分析了平面圆和三维球形禁飞区约束下临界安全悬停区域,评估了模型误差和J_2摄动对悬停被动安全特性的影响。该分析方法可为具有被动安全特性的近距离悬停任务设计提供指导。     

A novel non-separation opening scheme of front cover for rocket launch canister

In view of that existing opening technologies of front cover for rocket launch canister have disadvantages such as causing damage on the ground equipment, not being reused and easily broken. A novel reusable non-separation spring-driven opening scheme is proposed to achieve rapid and reliable opening of the front cover. The mathematical model of the opening process of the front cover is established by the rigid body dynamics theory. To establish a response surface model to optimize the opening scheme, three main influencing factors of the opening process are obtained through the designed experiments, including the pre-compression, the stiffness of the thrust spring, and the thrust spring force arm length. In addition, the prescribed kinematic law was taken as constraint, and the smaller thrust spring preliminary pressure and angular velocity was taken as optimization expectations. The results show that the opening scheme meets the design requirements on opening process well. It also shows that the optimized scheme can reduce the kinetic energy of the front cover, and the impact on the canister effectively, achieving a reliable and rapid opening of the front cover.     

基于二元语义和模糊理论的舰员级维修绩效评估方法

针对舰员级维修工作的特点,建立了绩效评估指标体系,将二元语义和模糊理论相结合,提出了一种舰员级维修绩效评估方法,并通过实例进行了计算和验证。该方法可以有效解决语言评价信息集结和运算中出现的信息丢失和扭曲,提高评估精度,为绩效管理的各环节工作提供了依据。