网络节点双机容错系统中的重构算法

提出了一种网络节点双机容错系统中的重构算法,详细叙述了重构时序和内存数据的一致性,并给出了算法流程。     

坦克履带板材料的现状和探讨

论述了现用坦克履带板的使用情况和主要失效形式,通过分析ZGMn13的加工硬化特点,提出了降低奥氏体的稳定性,在使用中实现应变诱发马氏体相变的强化机制,并完成了实验室条件下的成分设计和优化.     

潜艇仿真器支撑平台的机构分析

本文对一种６自由度、大倾角、重载的潜艇仿真器支撑平台的机构进行了分析,利用几何形体法进行位置正解计算,并从运动学观点来分析其路径规划。该支撑平台同样适用于作为飞行仿真器支撑平台或并联机械手等。     

高炮人机半实物实时仿真系统

本文以P56半自动高炮系统为对象,介绍一个高炮人机半实物实时仿真系统的实现。主要包括系统设计思想和基本原理、硬件组成、软件设计以及系统主要特点。该系统的实现,为高炮人机系统提供了一个良好的研究手段。     

Peridynamic modeling and simulation of thermo-mechanical de-icing process with modified ice failure criterion

De-icing technology has become an increasingly important subject in numerous applications in recent years. However, the direct numerical modeling and simulation the physical process of thermo-mechanical deicing is limited. This work is focusing on developing a numerical model and tool to direct simulate the de-icing process in the framework of the coupled thermo-mechanical peridynamics theory. Here, we adopted the fully coupled thermo-mechanical bond-based peridynamics (TM-BB-PD) method for modeling and simulation of de-icing. Within the framework of TM-BB-PD, the ice consti-tutive model is established by considering the influence of the temperature difference between two material points, and a modified failure criteria is proposed, which takes into account temperature effect to predict the damage of quasi-brittle ice material. Moreover, thermal boundary condition is used to simulate the thermal load in the de-icing process. By comparing with the experimental results and the previous reportedfinite element modeling, our numerical model shows good agreement with the pre-vious predictions. Based on the numerical results, we find that the developed method can not only predict crack initiation and propagation in the ice, but also predict the temperature distribution and heat conduction during the de-icing process. Furthermore, the influence of the temperature for the ice crack growth pattern is discussed accordingly. In conclusion, the coupled thermal-mechanical peridynamics formulation with modified failure criterion is capable of providing a modeling tool for engineering ap-plications of de-icing technology.     

Fabrication and characterization of Al-CuO nanocomposites prepared by sol-gel method

In this study, Al-CuO nanocomposites were fabricated by sol-gel method. As a contrast, the thermite was prepared by physical mixing at the equivalence ratio of 0.5, 1, 2, respectively. The intermediates and samples as prepared were characterized by SEM and XRD. The exothermic properties of the two samples prepared at different equivalence ratios were tested and the reaction products were characterized by XRD. The SEM results show that the sample prepared by the sol-gel method demonstrates a micron-sized agglomerated sphere formed by a mutual wrapping of Al NPs and CuO NPs, and the particles are evenly distributed in the agglomerate. In addition, when the content of Al powder is seriously insufficient, the heat release of the sample prepared by physical mixing is 1.6 times that of by sol-gel method. With the increase of Al powder content, the exothermic properties of Al/CuO NPs prepared by sol-gel method began to increase significantly compared with physical mixing and the difference is 1.5 times when the equivalence ratio increases to 2. It can be concluded that the reason for this result may be attributed to the different mass transfer modes of components due to the different morphologies of samples.     

Numerical research on adverse effect of muzzle flow formed by muzzle brake considering secondary combustion

The simulation of the artillery interior and intermediate ballistics problem is performed to investigate the influence of a gas dynamics device, muzzle brake, on the muzzle hazard phenomena, such as flash and blast waves. The correlation of the chemical reactions with the characteristics of the muzzle flow field is analyzed by the simulation for a further understanding of the secondary combustion phenom-enon of the muzzle flow. The novel structure of muzzle flow caused by the muzzle brake is presented by the simultaneous solution of the interior ballistics model and multi-species Navier-Stokes equations in order to analyze the influence of the muzzle brake structure on the chemical reactions. The secondary combustion of the muzzle flow due to the oxygen-supplement chemical reactions is obtained by the chemical reaction kinetic model. The interaction of the blast waves released from the muzzle brake is illustrated in detail and the mechanism of the formation of muzzle flash is analyzed. This research provides a reference for the studies on the suppression of the muzzle flash.     

罐底渗漏的罐基油气质量分数探测法识别

油罐是油品储运的重要设备,罐底最易出现穿孔渗漏油现象,致使罐基内部油气质量分数高于正常值。以油库中柴油覆土罐群为例,研究并试验了根据罐基油气质量分数识别罐底渗漏的方法：分析罐基探漏孔位置分布并钻孔;多次探测罐基油气质量分数,根据探测数据识别各罐有无底部渗漏;为了便于以后检测油库时识别各罐有无渗漏,为各罐建立状态监测表,并将无渗漏的罐基油气质量分数最高值暂定为该类罐的安全值,低于该安全值的油罐可直接判定为无渗漏。实践结果证明,这种不开罐检测罐底渗漏油的方法可及时发现故障并采取措施,对储油安全具有重要意义。     

巡航导弹地形跟踪系统仿真的研究

基于预见控制理论,采用零相位误差跟踪控制器,实现巡航导弹的前馈控制,能使导弹飞行良好地跟踪地形,还给出了前馈控制器的设计方法,并对导弹飞行过程作了系统仿真.     

次氯酸钙乳液消毒剂模拟剂的研究

研究了一种次氯酸钙乳液消毒剂的模拟剂,以及一些影响稳定性因素．该模拟剂是以氢氧化钙为分散相,水为分散介质,表面活性剂和无机盐为稳定剂组成．实验结果表明,该模拟剂具有与次氨酸钙消毒乳液相同的物理性能,并且无污染,可用于教育、作训之中．