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

doi:10.19693/j.issn.1673-3185.01139

水下爆炸下舰艇不同部位冲击环境数值分析

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

摘要

摘要:
目的水下爆炸下的舰艇冲击环境是舰用设备抗冲击设计和评估的基础输入。
方法采用数值方法研究某型船在水下爆炸下不同位置的冲击环境，流固耦合作用采用二阶双重渐近法（DAA₂）。首先选取不同的阻尼比等参数，然后使用不同安装频率的弹簧振子模拟弹性设备。
结果研究获得了典型位置处与实船相吻合的冲击谱结果，并验证了DAA₂法的准确性和可靠性。在相同冲击输入下，利用振子计算得到不同安装位置的冲击响应并转换得到冲击环境，分析得到了冲击环境在全船上的分布和衰减规律。
结论研究结果可为舰船设备抗冲击设计提供参考。

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.

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