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1.
定时维修间隔期的优化计算方法   总被引:1,自引:0,他引:1  
分析了现有装甲装备定时维修可能出现维修过剩的问题,阐述了合理确定定时维修间隔期的重要性,对以费用最小为目标的定时维修间隔期模型进行了研究,实现了优化定时维修间隔期的目的。  相似文献   

2.
为解决在理论研究阶段利用试行方法评价车辆装备关键零部件预防性维修间隔期可操作性较低的问题, 提出基于蒙特卡罗仿真评估预防性维修间隔期的方法和流程。选取评价车辆装备关键零部件预防性维修间隔期效果 的指标,阐述车辆装备关键零部件定期更换和定期检测策略,以评价制动器摩擦盘预防性维修间隔期为例进行分析 验证。结果表明,该方法能有效对车辆装备预防性维修间隔期维修效能作出定量评价。  相似文献   

3.
席启超  曹继平  陈桂明  常雷雷  熊奇  王赛 《兵工学报》2017,38(11):2251-2258
为保持装备寿命周期的运行可靠性,针对周期预防性维修模型和顺序预防性维修模型的优缺点,结合装备维护保养实际,提出3阶段等周期预防性维修模型。以可靠度约束条件下的装备寿命周期最小费率为优化目标,建立了周期预防性维修模型、顺序预防性维修模型和3阶段等周期预防性维修模型,从而得到各计算模型装备寿命周期的最优预防性维修次数和维修间隔期。结果表明,在同等条件下,3阶段等周期预防性维修模型既能保持装备寿命周期内较高的可靠性和较低的费率,又能紧密结合维修操作实际,具有良好的应用可行性和推广性。  相似文献   

4.
结合装备大修,对现有装备进行适当的改进性维修,以提升装备性能改善,装备使用与保障要求,改进后需要适当调整维修间隔期并对改进性维修的效能进行评判;在总结了改进性维修的现状以及存在的问题,改进性维修的一般原则,分类方式及步骤方法的基础上,提出了维修间隔期的调整方法,并用改进性维修后装备可用度增长的百分比和改进性维修费用增长百分比的比值大小作为改进性维修的评价,根据评价的结果选择较好的调整方案。  相似文献   

5.
针对具有三级维修机构保障的复杂设备,在小修修复如旧、中修大修均可使设备年轻固定时间的假设下,通过对设备使用和修理流程分析,给出了设备寿命期内的使用与修理状态转移图,建立了设备寿命期内的维修间隔期与可用度关系模型,求出了设备在固定的维修间隔期和一定维修转换规则下的平均可用度。案例分析得到了使可用度达到最大时的设备最佳维修间隔期,并通过与大修修复如新进行比较,说明了模型的适用性与灵敏性,可为设备维修决策提供依据。  相似文献   

6.
针对描述产品故障规律的函数很难获得和基于产品故障规律进行定时维修间隔期优化的方法在实际应用中有一定困难的问题,研究了基于产品关键零部件技术状态的定时维修间隔期优化方法。分析了基于关键零部件技术状态信息优化定时维修间隔期的思路,介绍了基于关键零部件技术状态信息评估定时维修方案合理性的方法,分别建立了维修不足和维修过剩时定时维修间隔期的优化模型。  相似文献   

7.
基于可靠性的装备预防性维修支持系统采用C/S分布式结构,由用户、应用和支撑三层组成,包括事后维修、定时和视情况预防性维修.系统知识库包括可靠性、维修性、经济性、测试性、维修间隔期算法、维修方案及控制等规则库.输入静动态参数后进行预处理,调用推理计算系统,确定维修方式和类型,调用有关的规则,算出合理的维修间隔期.  相似文献   

8.
利用多维状态特征参数对装备故障风险的强相关关系,采用威布尔比例风险模型建立了状态维修决策模型。针对典型比例风险建模过程中参数估计方面存在的缺点,采用基于遗传算法的参数估计方法,提高了建模精度。针对检测间隔期决策,提出通过确定状态劣化阈值,在状态劣化阶段实施动态检测的检测策略,建立了区间型检测间隔期优化方法;针对维修行为决策,将失效风险阈值与状态检测间隔期阈值相结合维修行为的综合决策,提高了决策的稳定性。以某发动机为例对状态维修决策方法的有效性进行了验证。  相似文献   

9.
通过分析空客和波音公司相似机型的分析方法和经验,确定了国产客机结构维修工程分析中ED、AD等级评级和检查间隔期确定的初步思路,并以某国产客机舱门为例进行分析.该确定方法可为进行详细维修工程分析提供参考,适用于某国产客机结构维修工程分析工作.  相似文献   

10.
导弹武器装备备件数量计算方法研究   总被引:15,自引:0,他引:15  
基于导弹装备备件储存不合理的现状,探讨了寿命服从指数分布、正志分布和威布尔分布的导弹部件的初始备件需求量,以及可修复件和不可修复件的后续备件数量的计算方法.讨论了备件保障和战备完好性的关系,指出按战备完好性要求配置备件是科学、合理的方法.  相似文献   

11.
Tetraacetyldibenzylhitane (TADBIW) was subjected to debenzylation by nitrosating with inorganic materials available commercially to synthesize tetraacetyldinitrosohexaazaisowurtzitane (TADNSIW). TADNSIW was purified, and its structure was determined by FTIR, 1H NMR, MS and element analysis. The debenzylation reaction of TADBIW gave quantitative benzaldehyde as a by-product. This indicates that the reaction produces an imine cation as an intermediate. Hexanitrohexaazaisowurtzitane (HNIW) was prepared from unpurified TADNSIW with the yield over 96.0 % and the purity more than 98.0 %. And the mechanism of the reaction from TADNSIW to HNIW is proposed to be oxidation of nitroso and nitration of acetyl on the molecule of TADNSIW, This reaction system involved is simple, and the reaction can complete within a short time and under mild conditions. The product can be easily to separate and the waste disposed readily.  相似文献   

12.
The technique of watermarking has been introduced into 2D vector maps for many potential applications such as protecting the copyright of important GIS (geographical information system) data and tracing the data source of military maps. In most previous works, although the validity of the map data could be preserved during the embedding procedure, the shape-distortions of the map elements are usually neglected which would tend to degrade the invisibility of the watermarking schemes. A shape-preserving algorithm for watermarking 2D vector maps is presented in this paper. A 1D distance sequence extracted from the original map is adopted as the cover data instead of 2D coordinates. A watermark bit is represented by changing the distributions of the cover data. The embedding procedure induces lower shape-distortions than in former works. Experimental results indicate better invisibility of the proposed scheme, as well as its robustness to certain attacks such as map simplification, interpolation, additive noise and most geometric transforms.  相似文献   

13.
By analyzing the influencing factors of part quality making of sheet alloy of titanium by vibra cutter, the shape of upper reamer is set as cylinder and wedge-shaped form, and the lower reamer as plain and hemicycle form, and its main structural parameters are defined as well. Then it is validated further that such improved vibra cutter reamer can be used to process curve-edged parts of titanium alloy sheet. The experimental result shows that the titanium alloy sheet parts processed by above equipment have no sharpen angles for convex parts and evident crevasse of concave-edged part. In summary, such improvement can eliminate the free-waved edge and improve the manufacture quality of titanium alloy sheet parts greatly.  相似文献   

14.
The initiating behavior of fine-grained explosives by small flyer is studied. The diameter of small flyer in this device is 1 ram. The test results indicate that the granularity of explosives has great effect on its flyer initiating sensitivity.The flyer initiating sensitivity of the fine-grained explosives is higher and the critical initiating energy is lower than that of common explosives. For common explosive, the flyer initiating sensitivity increases as the density is reduced. But for the fine-grained explosive, the test results are exactly opposite.  相似文献   

15.
Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design.  相似文献   

16.
An expression for estimating the aeroheating on a warhead nose at different supersonic speeds is proposed by incorporating CFD (computational fluid dynamics) and the least-square method. Compared with the traditional estimation formula, the expression is more accurate, convenient and can be used in the optimized design of warheads. The error from the result obtained in the test of a ball cartridge flight is less than 3 %. It satisfies the engineering requirements.  相似文献   

17.
The nonlinear dynamic model of spinning ballistic missiles is established during the first boosting phase of the missile. Based on the conventional backstepping sliding mode control and the assumption of a two time-scale separation of missile dynamics, a graded sliding mode controller is designed with two sub-sliding surfaces which have invariability to external disturbances and parameter perturbations, and a matrix which comprises three first order low pass filters is introduced to prevent "explosion of terms". Owing to the upper bounds of the uncertainties are difficult to obtain in advance, adaptive laws are introduced to estimate the values of the uncertainties in real-time. Eventually, the numerical simulation results given to show the proposed controller can ensure the steady flight of missiles.  相似文献   

18.
By analyzing the working principle of Linux network device driver, discussing the Linux network driver structure and its key technologies, the general network driver structure and its design methodologies in Linux system are summarized. Through modifying the network device driver of Linux device driver 3rd version snull, c and improving the COW technology, the Zero-Copy technology in Linux (kernel version 2.6.11 ) is implemented. In the end, the success test tells us that the thorough analysis of network device driver is the foundation of many applications, and it also provides a certain improvement to a lot of real applications, even to military application development.  相似文献   

19.
For measuring velocity and impacting position of single fragment of warhead, a non-contact measuring method is proposed, in which a six-light-screen array, a position indicator, a multi-channel chronograph and a computer are used.The principle of measurement is described. The key device of the system is a light screen array sensor which consists of six light screens allocated with certain geometrical parameters. When the fragment flies through the light screen array, the time of passing through each of the screens is recorded by the multi-channel chronograph. According to the time data and the geometrical parameters of the array, the velocity vector and the location of the fragment can be calculated immediately. The presented method can be used to locate the fragment and to measure the real velocity on its flying direction. It can also be used to measure the velocity of a fragment swarm after the system is engineered further.  相似文献   

20.
阐述了数码电子雷管中,点火药剂细结晶三硝基间苯二酚铅(LTNR)的制备工艺;从点火药剂的种类、加入黏合剂的质量分数、桥丝直径、点火头的电阻值、防潮漆的蘸涂等方面对点火头性能的影响因素进行了探讨;通过震动试验、并联起爆试验、延期精度检测与考核,试验结果表明:一次性合成的细结晶LTNR是制造数码电子雷管点火头较为理想的点火药剂,按技术要求生产的点火头性能指标能够满足行业标准要求。  相似文献   

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