摘要
针对水下中远场爆炸作用下航行体表面动态响应复杂、预测困难的问题,基于任意欧拉-拉格朗日数值算法,考虑自由面对冲击波反射的影响,利用爆炸相似理论细化模型网格,运用有限元软件对水下爆炸模型进行求解。分析冲击波作用下航行体表面动态应力峰值出现的时间和区域,并对其动态响应随当量、爆距及水深的变化规律进行研究。利用数值拟合方法得到航行体表面动态应力方程,并通过决定系数验证其可靠性,在定当量、爆距情况下可直接求解其动态应力。研究结果表明:当量增加,动态应力在相同爆距区间内衰减速率增大;爆距增大,动态应力在相同当量区间内增长速率降低;深度每下降100 m,动态应力增长20 MPa左右。所得研究结果可为中远场水下爆炸作用下航行体安全防护和抗冲击研究提供一定参考。
The dynamic response of underwater vehicle surface after an underwater explosion in the far field is predicted by the numerical algorithm based on arbitrary Euler-Lagrange method.In this paper,the impact of free surface on shock wave reflection is taken into consideration,the model mesh is refined using the explosion similarity theory,and the finite element software is used to solve the underwater explosion model.The timing and location of peak dynamic stress on the underwater vehicle surface subjected to the shock wave are determined,and the variations in dynamic response with equivalent,blast distance and water depth are studied.A dynamic stress equation for the underwater vehicle surface is obtained by a numerical fitting method,and the equation's reliability is assessed through the coefficient of determination.It is observed that an increase in the equivalent results in a higher decay rate of dynamic stress in a fixed blast distance interval.Conversely,an increase in the blast distance leads to a reduced growth rate of dynamic stress in the same equivalent interval,while a decrease in water depth by 100 meters is associated with an approximate 20 MPa increase in dynamic stress.The research outcomes offer valuable insights and serve as a reference for future investigations in safety protection and impact resistance assessments.
作者
张勇
肖正明
段浩
伍星
卢敏
王浩
ZHANG Yong;XIAO Zhengming;DUAN Hao;WU Xing;LU Min;WANG Hao(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China;705th Research Institute Kunming Branch,China Shipbuilding Industry Corporation,Kunming 650500,Yunnan,China;Yunnan Vocational College of Mechanical and Electrical Technology,Kunming 650203,Yunnan,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2024年第7期2341-2350,共10页
Acta Armamentarii
基金
国家自然科学基金项目(51965025)
云南省重点研发计划国际科技合作专项项目(202003AF140007)
云南省基础研究计划面上项目(202201AT070103)。
关键词
水下航行体
中远场水下爆炸
任意欧拉-拉格朗日方法
爆炸相似理论
动态响应
underwater vehicle
middle and far field underwater explosion
arbitrary Euler-Lagrange method
explosion similarity theory
dynamic response
