摘要
在水下爆炸模型试验和数值计算中常用冲击因子来对结构的冲击环境作简单描述,而传统的冲击因子在描述近距离水下爆炸相似性问题时存在一些不足.该文试图定义一种新型的冲击因子,使之较传统冲击因子有更加广泛的适用范围并提高精度.使用ABAQUS软件对水面舰船模型进行数值仿真,从结构总动能、总势能、平均冲击谱响应3个方面来考察计算结果.结果表明,在新型冲击因子相等的条件下,各工况的上述3方面冲击响应总体效果较为接近.而传统冲击因子相等时,结构冲击响应总体效果差异很大.通过分析可知,该文定义的新型冲击因子不仅能描述爆距变化范围较大的工况冲击环境的相似,还能描述相同爆距下药包水平方向移动的工况冲击环境的相似,这对相关的研究和工程应用有一定借鉴意义.
An impulsive factor is usually used to describe the impulsive environment in model experiments and numerical calculation of underwater explosions, but the traditional impulsive factor has some limitations. In this paper a new kind of impulsive factor is defined, which has more extensive scope and higher accuracy. ABAQUS software was used to solve and simulate the effects of underwater explosions on warship structures. Calculated results were analyzed in terms of total structural kinetic energy, total structural potential energy, and average spectrum response. Results show that the total impulsive responses of warship structures are similar when the new impulsive factors are equal, but they are different when the traditional impulsive factors are equal. Through synthetic analysis we can conclude that the new impulsive factor can describe cases with wide variations in range of standoff distances, as well as the cases with charges shifting horizontally at the same standoff distance. This has significant relevance to related research and engineering applications.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2007年第5期501-509,共9页
Journal of Harbin Engineering University
关键词
水下爆炸
水面舰船
冲击因子
相似性
underwater explosion
warship
impulsive factor
similarity
