杀爆战斗部破片和冲击波对目标的耦合作用

为了获得杀爆战斗部对目标作用时破片和冲击波两种毁伤元耦合作用机理,分析了作用时序对耦合作用的影响,并通过量纲分析给出了以有孔平板相对于无孔平板在爆炸冲击波载荷下的中心点挠度增益表征的耦合作用系数。利用AUTODYN软件对爆炸冲击波作用下预制孔及无孔平板的塑性变形进行了数值模拟并进行了试验验证,以模拟结果为数据支撑构建了耦合作用模型,提出了杀爆战斗部对典型目标的耦合毁伤计算公式。应用建立的公式针对某杀爆战斗部对典型目标的毁伤进行了评估。结果表明,当穿孔密度较低时,平板中心点挠度变化并不明显,随着破片穿孔密度的增加和直径的增大,平板中心点挠度增益与孔密度和直径呈正相关的变化规律。采用联合毁伤模型较独立毁伤模型杀伤半径提高,提高幅度最大可达9.5%。     

Numerical simulation of the parabolic shellsurface under blast wave loading

Deformation of parabolic shell surface under explosion shock waves is a complex dynamicproblem. Because of reflection and interference of blast wave,it’s hard to analytically delineate thedynamic responds of radar parabolic shell surface on blast wave. To gain the characteristics of thinshell deformation under impulsive loading of blast wave,numerical simulation methods for blast loadon the shell structure was studied and analyzed. Euler-Lagrange numerical simulation was implemented by AUTODYN code to simulate the problem. Through analysis on deflection feature of radial position under different explosive mass and detonation height,an equation was founded by fitting thedeflection results from numerical simulation results of shockwave loading. Experiments were arranged to confirm the validity of the formula. The results gained by simulation are consistent withexperiments,and the formula can be used to delineate the deflection of aluminum alloy parabolicshell under blast loading.     

爆炸驱动金属管膨胀理论计算

描述了对爆炸驱动金属管膨胀的理论计算并通过实验对其进行了验证.利用力学模型和经验公式计算不同材料和尺寸的金属管的爆轰参数膨胀角、破裂半径和爆速.采用高速分幅相机测试技术,得到了金属管膨胀运动过程的分幅照片,掌握了金属管的膨胀及破裂情况,由此测得了膨胀角,并使用电探针测量了炸药爆速.通过与实验金属管的膨胀数据对比,为理论计算可靠性提供重要依据.     

铁路客户服务中心旅客列车正晚点查询系统设计与实现

现有12306网站列车正晚点查询系统功能单一、时效性弱,难以支撑铁路客户服务中心在此方面的咨询、投诉受理工作。针对此状况本文通过讨论相关业务,分析系统实现的难点问题,给出对应解决方案并设计实现了新的铁路客户服务中心旅客列车正晚点查询系统。通过实际生产数据测试比对检验,该系统效果明显优于既有系统。     

Numerical simulation of the parabolic shell surface under blast wave loading

Deformation of parabolic shell surface under explosion shock waves is a complex dynamic problem. Because of reflection and interference of blast wave, it’s hard to analytically delineate the dynamic responds of radar parabolic shell surface on blast wave. To gain the characteristics of thin shell deformation under impulsive loading of blast wave, numerical simulation methods for blast load on the shell structure was studied and analyzed. Euler-Lagrange numerical simulation was implemented by AUTODYN code to simulate the problem. Through analysis on deflection feature of radial position under different explosive mass and detonation height, an equation was founded by fitting the deflection results from numerical simulation results of shockwave loading. Experiments were arranged to confirm the validity of the formula. The results gained by simulation are consistent with experiments, and the formula can be used to delineate the deflection of aluminum alloy parabolic shell under blast loading.