【作者】 黄超；

【导师】 杨志国；

【作者基本信息】 哈尔滨工程大学 ， 船舶与海洋结构物设计制造， 2009， 硕士

【摘要】 本文以舰船近场非接触水下爆炸防护问题为研究背景,考虑了近场水下爆炸作用于结构过程中冲击波、气泡运动等载荷阶段的影响,分析总结了4种夹层结构在近场非接触水下爆炸载荷作用下的动态响应规律,并将其引入中小型水面舰船舷侧防护设计,对现有防护结构提出改进,为舰船防护设计提供了新思路。首先,本文对二战以来的舰船传统防护结构做了介绍和归纳,分别基于平面正冲击波关系、牛顿运动定律和冲击动力学理论,对在舷侧水舱中设置空气隔层结构对冲击波载荷的防护机理、邻近爆炸载荷作用下舷侧防护水舱的动态响应和船底液舱对冲击波载荷的响应进行了总结和修正,分析结果对舰船结构抗爆设计具有一定参考价值。经过分析和总结,认识到传统防护形式对于中小型水面舰船结构防护设计是不可能实现的,必须通过其它途径来改进。其次,在水下爆炸流动特性数值模拟研究中,本文基于物态方程和爆炸力学理论,对现有水Gruneisen物态方程参数进行了修正,指出冲击波速度与粒子速度的三次拟合比线性拟合更有效,并对Gruneisen系数对水Hugonoit曲线的影响进行了分析讨论,通过自由场深水球爆问题和气背固支方板水下爆炸动响应问题的数值模拟验证了本文所取修正参数的有效性,新的Gruneisen参数能够更好的反映近场水下爆炸流场的流动特性。最后,本文应用多物质耦合有限元法,模拟对比了SPS水下爆炸实验,验证了SPS的抗爆性能。在此基础上,分析比较了质量等效的方孔蜂窝夹层板、波纹夹层板两种格栅式夹层板和厚、薄两种SPS共4种夹层结构在近场非接触水下爆炸载荷作用下的动态响应特性。结果表明,SPS在抗变形能力、吸能特性和保持结构完整性方面均具有优势,是结构性能最优的夹层板。以此为基础,本文将SPS引入中小型水面舰船舷侧防护结构的改进,提出了舰船新型舷侧抗爆防护结构设计。更多还原

【Abstract】 The primary objective of this thesis is:to research the defensive problem of naval ship under proximity un-contact underwater explosion loading. Considering the effect of both shock and bubble loading, the dynamic response of four different sandwich structures undergo a close-in UNDEX loading are analyzed and some rules are obtained. Based on these researches, some innovation is made to improve the existing shipboard defensive structure design, and the sandwich structure conception is introduced.First, this thesis summarizes the major ship defensive types since World War II. Then, theory research on the response of the air interlayer, the defensive water cabin and the fluid cabin in the bottom of ship undergo UNDEX loadings are provided by using plane shock theory, Newton’s second law and shock dynamic theory. Some references for the correlative theory research and engineering calculation are provided by the analysis results. Conclusion reveals that for the defensive of medium and small sized ship the traditional design is not available, some other approach must be put forward.Then, in order to capture the exact flow behavior, the parameters of Gruneisen equation of state of water are analyzed and some modified parameters which can better capture the propagation of a pressure wave generated by underwater explosion through a fluid medium are proposed. The cubic fit of shock velocity via particle velocity is better than linear fit, and the influence of Gruneisen gamma acts on Hugoniot curve is discussed also. Both infinite field deep water spherical bubble problem and the dynamic characteristic of air-back square steel plate under underwater explosion loading are investigated. The result indicates that the new Gruneisen parameters can exactly capture the flow behavior. Finally, the multi-material coupled finite element method is used to simulate the UNDEX experiment of SPS to validate its blast-resistance. Then, four mass equivalent sandwich structures under proximity underwater explosion loading are calculated. The dynamic response of the sandwich having three different types of core topology:continuous elastomer core with different thickness, square honeycomb core and corrugated core are simulated and analyzed. The deflection mechanics and energy absorption characteristics of these sandwich structures are discussed. Results of the study indicate that the steel sandwich plate is an excellent sandwich structure with stronger energy absorption and smaller deflection in all sandwich plates by loading the plates with four different intensities underwater explosion. Based on these results, improvements are advanced to the shipboard defensive of medium and small sized ship.更多还原