【作者】 胡刚义；

【导师】 夏飞； 崔维成；

【作者基本信息】 中国舰船研究院 ， 船舶与海洋结构物设计制造， 2011， 博士

【摘要】 潜艇结构在水下爆炸冲击作用下的动态响应机理与分析非常复杂,是潜艇抗冲击设计的关键技术之一,在潜艇的生命力设计中占有非常重要的地位。本论文以带覆盖层的圆柱壳和复合材料圆柱壳为对象,对其在水下爆炸冲击响应进行了理论研究、数值计算和实验研究。本文首先对反射尾流虚源模型做了进一步研究,推导了反映声波与壳体相互作用的压力方程与壳体表面径向速度的关系式,解决了水下爆炸环境下作用在无限长圆柱壳表面的流体动压力(辐射压力与散射压力)计算分析问题,为求解不同形式的壳体结构在冲击波作用下的响应奠定基础。随后利用上述模型及Flugge弹性圆柱壳的动力学壳理论,研究分析了阶跃和指数衰减两种平面冲击波作用下的无限长单层圆柱壳、双层圆柱壳和复合材料圆柱壳瞬态响应。计算所得结果与已有结果相比较表明:对于平面波作用下的弹性圆柱壳的动力响应,本文采用的RAVS模型给出了很好的近似。通过大量数值计算,研究了各种形式的圆柱壳几何参数和材料参数对冲击响应的影响,得到了一些有价值的结论。本文最后对水下爆炸冲击波作用下圆柱壳结构响应开展了试验研究,对理论成果的正确性进行了验证,总的来说,数值计算结果与试验测量结果有相当的一致性。同时通过试验研究发现:在圆柱壳外表敷设弹性橡胶层有利于改善水下爆炸冲击环境,橡胶层使径向加速度峰值减小,但壳体应力有增大的现象。全文为带覆盖层的圆柱壳体水下爆炸冲击响应问题提供了一种新的理论计算方法和参数优化设计方法。在本文所提出的模型和求解方法的基础上,和实验相结合,进行一定的修正,可进一步提出一个可应用于概念设计阶段的抗冲击能力预先评估的半解析/半经验工程估算方法。更多还原

【Abstract】 The dynamic response of submarine subjected to explosion (UNDEX) was so complex that became one of the key technologies to anti-explosion, and played an important role in submarine rescuing design. The dissertation studied the cylindrical shell with sound absorption material stuck to the outer hull and the composite cylindrical shell did numerical calculation and experiment research about dynamic response on UNDEX.First, the Reflected-After flow Virtual-Source model (RAVS) was researched. At the same time, the formulation of fluid-structure interaction and the expression of velocity of shell were got. The problem about the outer fluid dynamic pressure on infinite long cylindrical shell in UNDEX was solved, which became the base of dynamic response on different shell structure.Then, the above theory and Flugge were introduced to analyze the computation procedure about UNDEX response of an infinite long cylindrical shell for different types such as single layer, double layer, and composite material. The comparison of calculation showed that RAVS model gave a good approximation.At last, experimental validation of the computation methods was done. The UNDEX experiments were performed on the cylindrical models with and without the sound absorbing layer. The experimental results were compared well with calculated results. At the same time, some useful conclusions were got just as the elastic cylindrical shell could decrease the wave shock.The dissertation presents a new formulation for solving the UNDEX dynamic response of cylindrical shell with sound absorption material stuck to the outer hull. The formulation could be further combined with experiment results to obtain a theoretical and empirical mixed method for concept design stage.更多还原