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水下冲击波作用下结构损伤的数值预报误差分析
引用本文:张艺凡,宗智,张文鹏.水下冲击波作用下结构损伤的数值预报误差分析[J].中国舰船研究,2011,6(6):38-44.
作者姓名:张艺凡  宗智  张文鹏
作者单位:大连理工大学工业装备结构分析国家重点实验室运载工程与力学学部,辽宁大连,116024
基金项目:国家自然科学基金(50921001); 973项目(2010CB832700)
摘    要:准确模拟结构在水下爆炸冲击波作用下的损伤是水下爆炸数值仿真中的难点,有必要研究数值预报误差及其产生的原因。采用ABAQUS提供的声固耦合方法,研究方板模型水下爆炸数值计算的误差。将几何模型划分为3个不同的有限元模型,分析了网格大小对计算结果的影响,以及声固耦合方法的计算误差。通过方板模型仿真、实验室水池试验和方板实船水下爆炸实验结果的比对分析表明:数值计算结果与实验值间的误差约在30%以内。总波和散波两种流固耦合计算方法的误差及其产生原因分析表明总波计算公式存在夸大空化对结构影响的可能。

关 键 词:水下冲击波  塑性变形  误差分析  流固耦合

Error Analysis of Numerical Prediction of Structure Damages Subjected to Underwater Shock
Zhang Yi-fan,Zong Zhi,Zhang Wen-peng.Error Analysis of Numerical Prediction of Structure Damages Subjected to Underwater Shock[J].Chinese Journal of Ship Research,2011,6(6):38-44.
Authors:Zhang Yi-fan  Zong Zhi  Zhang Wen-peng
Institution:Zhang Yi-fan Zong Zhi Zhang Wen-peng Faculty of Vehicle Engineering and Mechanics,State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024,China
Abstract:The fast development of computing technology saw wide applications of numerical simulations in underwater explosion in recent years,but it′s still difficult to numerically and exactly predict the damages of a marine structure subjected to underwater shock.It is true that the numerical results and experimental results of a certain underwater explosion problems are in good agreement,but in the most general cases,the problem that how good the numerical results agree with experimental results remain unsolved.In this paper,through three examples,we try to reveal the numerical errors compared with experimental results.All of the three examples show that the numerical errors can be controlled within 30 percent.Two numerical methods,that is,total wave and scatter wave formulations,are employed in this paper.It seems that the total wave method overestimates the effect of cavitations.
Keywords:underwater shock  plastic deformation  error analysis  fluid structure interaction  
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