# 水下爆炸下舰艇不同部位冲击环境数值分析

## 董九亭，刘建湖，汪俊，刘国振 214082中国船舶科学研究中心，江苏 无锡

Chinese Journal of Ship Research - - NEWS -

Numerical analysis on shock environment in different ship regions subjected to underwater explosion

DONG Jiuting，LIU Jianhu，WANG Jun，LIU Guozhen China Ship Scientific Research Center，Wuxi 214082，China

Abstract：［Objectives］The shock environment of a warship in an underwater explosion is the basic input for the design and shock resistance ability evaluation of ship equipment. ［Methods］ In this paper，a numerical simulation is used to analyze the shock environment in different regions of a ship，and the Second-order Doubly Asymptotic Approximation（DAA2）is used to solve the fluid-structure interaction. First，the appropriate calculating parameters are chosen，such as damping ratio，and then a series of Single-Degree-of-Freedom（SDOF） systems are attached at various deck locations to simulate flexible equipment.［Results］The accuracy and reliability of DAA2 is verified by the fact that the calculated shock spectrums at classic regions perfectly match the data of the ship shock trial. The shock response of the SDOF systems under the same shock input are then calculated and transformed into the shock environment. Finally， the results of shock environments in different regions are compared. ［Conclusions］ The conclusions of this paper can provide design reference data for the subsequent anti-shock design of equipment. Key words： underwater explosion； fluid-structure interaction； shock environment； numerical simulation；anti-shock of equipment

0引言

1 计算方法

2 模型计算及参数选取 2.1 有限元模型

2.2 参数确定

DAA2在 方法中，流体阻尼 η与瑞利结构阻尼C 是影响计算结果的重要参数。根据瑞利阻尼的表达式 C = αM + βK（ α 和 β 分别为控制质量 M

3 计算结果分析

（b）Floor of navigation bridge（test point T2）图2 不同阻尼参数下的冲击谱Fig.2 Shock spectrums of different damping parameters