基于LS-DYNA的大空间柱壳结构爆炸波压力场分析  

Analysis of explosive shock wave pressure distribution on large-space cylindrical reticulated shell based on LS-DYNA

作　　者：高轩能[1] 刘颖[1] 王书鹏[1] 

机构地区：[1]华侨大学土木工程学院,福建泉州362021

出　　处：《振动与冲击》2011年第9期70-75,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51008133);福建省自然科学基金项目(2011J01319);厦门市科技计划项目(3502Z20073036)

摘　　要：基于ANSYS/LS-DYNA,在验证模型及参数选取正确及可靠的基础上,建立了大空间柱壳结构在爆炸作用下的冲击波压力场计算模型。引入本征正交分解(POD)法,解决了冲击波荷载的时空差异性和结构表面压力场分布问题,大大减少了大空间结构爆炸动力响应分析的计算量。对大空间柱壳结构在爆炸冲击荷载作用下的压力场进行了数值模拟计算与分析,研究了跨度和矢跨比等因素对结构压力场分布的影响。结果表明,计算模型适用于大空间柱壳结构在爆炸作用下的动力响应计算。By employing algorithm ANSYS/LS-DYNA and based on the proof of correctness and reliability of the model and parameters selection,an appropriate model for calculating the shock wave pressure distribution on a large-spacec ylindrical reticulated shell under explosive loading was established.Using the proper orthogonal decomposition（POD） method,the problems of spatiotemporal asynchrony of shock waveforms and pressure distribution on the large-space structure surface were solved,accompanying with the process for calculation of dynamic response of large-space structure greatly reduced and simplified.The numerical simulation and analysis on shock wave pressure field of the shell under explosion was carried out.The influences of the span and the ratio of rise to span on the pressure distribution was investigated.The results show that the calculation model is suitable for the dynamic response analysis of large-space cylindrical reticulated shell under explosion.

关 键 词：爆炸 冲击波 大空间柱壳结构 本征正交分解(POD)法 矢跨比 

分 类 号：O383.2[理学—流体力学] TU393.3[理学—力学]