Experimental investigation on dynamic response and damage models of circular RC columns subjected to underwater explosions

Reinforced concrete (RC) columns are widely used as supporting structures for high-piled wharfs. The study of damage model of a RC column due to underwater explosion is a critical issue to assess the wharf’s antiknock security. In this study, the dynamic response and damage model of circular RC columns subjected to underwater explosions were investigated by means of scaled-down experiment models. Experiments were carried out in a 10.0 m diameter tank with the water depth of 2.25 m, under different explosive quantities (0.025 kg–1.6 kg), stand-off distances (0.0 m–7.0 m), and detonation depths (0.25 m–2.0 m). The shock wave load and dynamic response of experiment models were measured by configuring sensors of pressure, acceleration, strain, and displacement. Then, the load distribution characteristics, time history of test data, and damage models related to present conditions were obtained and discussed. Three damage models, including bending failure, bending-shear failure and punching failure, were identified. In addition, the experience model of shock wave loads on the surface of a RC column was proposed for engineering application.     

装备研制项目技术风险评估模型

建立了装备研制项目技术风险评估模型,并用系统分析的方法,实现了对技术风险的动态评估,并以示例进行了验证.     

无人机保障条件下的炮兵C4ISR系统作战效能评估

针对无人机保障条件下的炮兵指挥自动化(C4ISR)系统的作战运用特点,运用模糊理论探索其作战效能评估的有效方法.综合运用模糊综合评判和层次分析法(AHP)两种决策方法对无人机保障条件下的炮兵C4ISR系统的作战效能进行了评估,评估结果表明,无人机保障条件下的炮兵C4ISR系统的作战效能水平为正常.通过对影响炮兵C4ISR系统作战效能发挥的各个因素进行定量分析比较,认为当用无人机来保障炮兵C4ISR系统时,应当把确保系统的稳定性和提高无人机与炮兵C4ISR系统之间的通信控制能力作为重要环节来抓.     

防空兵作战指挥对抗能力评估方法

作战指挥对抗在未来防空作战中的地位越来越重要,为科学评估防空兵作战指挥对抗能力,对防空兵作战指挥对抗系统进行了全面分析,建立了防空兵作战指挥对抗能力评估指标体系.并利用模糊数学的方法,建立该系统的模糊综合评价模型,从而为综合评估防空兵作战指挥对抗能力提供了一种方法.该方法能使定性描述定量化,客观地反映了防空兵作战指挥对抗能力的真实情况,具有一定的参考价值.     

基于模糊综合评价法的装甲团城市 市区进攻战斗部署方案优化研究

战斗部署的内容是决心方案的主体部分,战斗部署确定的合理与否,将会直接影响到战斗方案的质量。因此,准确的评估战斗部署方案,对提高作战指挥决策的科学性,保障指挥员定下正确、合理的战斗决心具有重要意义。论文根据战斗部署的定义和战斗部署的要求,建立了城市市区进攻战斗部署的评价指标体系,并采用层次分析法确定其权重,最后使用模糊综合评价法对战斗部署方案进行评估。     

采用M阶正交信号的DS-CDMA系统性能分析

随着移动通信的迅速发展 ,码分多址技术受到越来越多的关注。为了提高系统的抗干扰性能 ,在CDMA系统中采用了M阶正交信号。通过分析采用M阶正交信号的DS CDMA系统基带接收信号的统计性能 ,文中得出了多址、多径干扰下系统的误码率计算公式 ,并详细分析了系统的抗干扰性能。     

均布压力下T型连接极限承载特性试验研究

针对复合材料舵翼骨架与蒙皮连接,设计了两种T型连接结构,并对其在波浪砰击载荷作用下的极限承载特性进行了试验研究。根据结构承载特点,提取典型局部试验缩比模型,给出了均布压力下T型连接试验载荷等效方法。试验比较了两种T型连接的承载特性差异,研究了跨距对T型连接初始刚度、极限破坏载荷以及极限承载弯矩的影响规律。试验结果表明:构型A存在明显的初始破坏,但极限破坏载荷大于构型B;极限承载弯矩基本不随跨距改变,可作为不同跨距、不同构型T型连接优劣衡量标准。最后,基于试验结果、载荷等效与缩比原则,提出了T型连接承载特性评价方法。     

陆航部队直升机武器系统效能评估研究

陆航部队直升机武器系统效能评估是直升机研制和使用的重要依据,是联合作战指挥的重要参考。本文论述直升机武器系统效能评估的基本内涵和一般步骤,从武器系统、态势感知、指挥控制及HUMS系统等方面对直升机武器系统效能评估的对象和目的进行分析,研究构建效能指标体系的一般过程,总结直升机武器系统效能评估的方法。     

Does military spending stimulate growth? An empirical investigation in Italy

This paper investigates the effect of military burden on economic growth and extends previous works on the optimal size of government expenditure by exploring how external threat affects the preferences of the households and, in turn, economic growth. Post World War II Italian data are used to estimate nonlinear growth models using time-series semi-parametric methods. The estimates show that total government and civilian burdens are productive, whereas, military burden has significant effects on economic growth through the expenditure for peacekeeping missions, which reduces the insecurity in the home country. This may justify economically the current not negligible budget devoted to peacekeeping and humanitarian missions.     

积极探索训练规律,加强学员军事基础素质的培养

通过研究“4+1”人才培养模式下学员军事基础素质培养过程,改革军事基础课程教学体系和学员队管理模式,实现军事基础教学与学员队管理的有机衔接,强化学员旅的教学管理职能,形成“三位一体”的学员军事基础素质培养模式,建立学员军事基础素质评价的指标体系。