基于RKDG方法的船体板架爆炸冲击响应数值模拟  

Numerical simulation of hull grillage responses under blast loading based on RKDG method

作　　者：于福临 郭君[1] 姚熊亮[1] 任少飞[1] 

机构地区：[1]哈尔滨工程大学船舶工程学院,哈尔滨150001

出　　处：《振动与冲击》2015年第13期60-65,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51109042);中国博士后科学基金资助项目(2012M520707);黑龙江省自然科学基金资助项目(E201124);黑龙江省博士后资助项目(LBH-Z12064)

摘　　要：基于欧拉流体力学方程组,对方程组分别进行间断迦辽金法空间离散和龙格库塔法时间离散,采用RKDG方法建立数值模型,模拟自由场空中爆炸冲击波载荷特性,并与经验公式对比,对RKDG计算程序进行验证。针对强间断性的空中爆炸冲击波与周围低压空气耦合特性问题,给出了流场密度和压力分布规律。最后编制计算程序,结合大型非线性有限元软件LS-DYNA,模拟板架结构在空中爆炸载荷作用下的变形和响应特征,计算发现:板架沿着T型材出现塑性变形,板格呈现局部隆起的碟形变形区,响应与距离爆心距离成反比。In order to simulate the characteristics of far field air explosion shock load,the discretized Euler equations were solved with RKDG method.The numerical model was established and the far field air explosion shock wave load characteristics were simulated.The results were compared with those of the empirical formula.The density and pressure distribution of high pressure shock wave with strong discontinuity were simulated with a Fortran program.Using LS-DYNA,the impulse responses of hull plates under shock load were simulated.The results indicated that the plastic deformation shape profiles appear along the stiffener direction,and the plate grillages reveal local dishing deformation,and the responses are inversely proportional to the distance from the explosion center.

关 键 词：间断伽辽金 空中爆炸 耦合特性 数值模拟 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3