基于样本库方法的船舶冲击环境工程化预报方法研究

  目的   为了优化舰船冲击环境预报载荷体系及研究气泡脉动压力对舰船冲击环境的影响，  方法   基于ABAQUS有限元分析软件，采用声固耦合方法模拟某舰水下非接触爆炸特性，通过与现有文献实验数据的对比验证该方法的有效性。在此基础上，针对水下爆炸气泡脉动压力进行冲击环境特性的研究。  结果   结果表明：气泡脉动压力对舰船低频响应有放大作用，垂向冲击谱值的影响要大于其他2个方向；上层甲板受气泡脉动的影响仍然较大，验证了甲板低频响应的衰减规律；对水下爆炸实验和冲击环境进行预报时，计算时间选取为1.5倍气泡一次脉动周期才可得到较准确的冲击环境数据，以此来验证海军标的准确性。  结论   研究结果有利于优化舰船冲击环境预报流程中各参数的选取，并可用于指导舰船冲击环境的预报。

Research on shock environment of ship based on sample library method

  Objectives   In order to standardize the load system of a hull's shock environment and study the effects of bubble pulsation pressure on a hull's shock environment,  Methods  acoustic-structure coupling methods are used to simulate a hull subjected to a non-contact underwater explosion. Comparing the simulation data with the experimental data in the literature, the method is shown to be effective. On this basis, the shock environment under bubble pulsation pressure is studied.  Results   The results show that bubble pulsation pressure has an amplification effect on the low frequency response of a ship, and the influence of the vertical shock spectrum is greater than in the other two directions. The upper decks are still affected more strongly by bubble pulsation, which verifies the decaying rule of the low frequency response of decks. To obtain more accurate data, a 1.5 times bubble pulsation cycle each time is recommended for experiments involving underwater explosion or the prediction of shock environments, which verifies the accuracy of the navy standard.  Conclusions   The results of this paper can be helpful for standardizing the selection of parameters in the process of shock environments, and provide a reference for shock environment forecast research.