水下舷侧防雷舱结构防护效能评估方法研究

Evaluation Methods of the Performance of Multi-Layered Blast Protection Blisters Subjected to Underwater Contact Explosions

为评估大型水面舰艇舷侧防雷舱结构的防护效能,基于动力学和能量原理提出防雷舱结构防护效能评估的基本思路及方法。利用高速破片的穿甲能力和在不同介质中的速度衰减规律评估液舱吸收高速破片的效能;根据波动理论和能量原理确定高速碎片以及爆炸产物对液舱内壁的冲击载荷,并结合能量原理提出液舱内壁的破损判别准则。对典型防雷舱结构模型的液舱吸收效能和液舱内壁防护效能进行计算评估,评估结果与模型试验结果吻合良好。

In order to assess the defensive performance of multi-layered blast protection blisters of large warships subjected to underwater contact explosion,both evaluation methods and procedures are suggested based on the principles of dynamics and energy.Basically,the capability of water blisters absorbing explo sive blast is assessed according to the penetration properties of high velocity fragments in different media,and the impulse loads and contact explosion shock wave loads on the inner wall are analyzed.The theoreti cal protective efficacy of multi-layered defensive structures is validated by employing a typical ship cabin contact explosion model under 300 g TNT.The results indicate that the velocity of damaged fragment can be decreased to a safety speed through a length of 0.1 m,and the minimum critical thickness of the inside wall structure of water blisters is 3.8 mm.