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<p>In this paper, the load characteristics of shock wave, bubble pulsating water jet and cavitation closure are studied by carrying out underwater explosion experiments and numerical simulation of fixed square plates with 2.5, 5 and 10 g trinitrotoluene. The results show that under the combined action of multiple loads, the impulse of bubble pulsation and water jet load plays a leading role in the process of underwater explosion, and the impulse of cavitation closure load is greater than that of shock wave. The damage to the structure cannot be ignored, and the pressure time-history curve presents a “multi-peak” state, and it is pointed out that the water jet is a concentrated load. Then, the dynamic response of the full-scale model of the ship under the combined action of multiple loads is studied, and the dynamic response of the ship under different cabin water depths and different explosion distances is discussed. The results show that when the ship is empty, the damage degree of the ship is the most serious, and the influence of cavitation effect on the half cabin is weaker than that of the empty cabin, so the damage degree is the second, and the damage degree is the smallest when the cabin is full. When the distance parameter is less than 0.68, the shock wave and the after flow play a leading role in the dynamic response of the ship. When the distance parameter is between 0.68 and 1.38, the combined action of the bubble pulsating water jet and the cavitation closure multi-load causes the main damage to the ship. When the distance parameter is greater than 1.38, the bubble pulsation and the cavitation closure load play a leading role.</p>

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Investigation on dynamic response of ship structure under multi-load combined action of underwater explosion considering cavitation effect

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Yufan Chen,
  • Jian Qin,
  • Zhichao Lai,
  • Xiangyao Meng,
  • Yanbo Wen,
  • Yipeng Jiang,
  • Zhenhuang Guan,
  • Ruiyuan Huang

摘要

In this paper, the load characteristics of shock wave, bubble pulsating water jet and cavitation closure are studied by carrying out underwater explosion experiments and numerical simulation of fixed square plates with 2.5, 5 and 10 g trinitrotoluene. The results show that under the combined action of multiple loads, the impulse of bubble pulsation and water jet load plays a leading role in the process of underwater explosion, and the impulse of cavitation closure load is greater than that of shock wave. The damage to the structure cannot be ignored, and the pressure time-history curve presents a “multi-peak” state, and it is pointed out that the water jet is a concentrated load. Then, the dynamic response of the full-scale model of the ship under the combined action of multiple loads is studied, and the dynamic response of the ship under different cabin water depths and different explosion distances is discussed. The results show that when the ship is empty, the damage degree of the ship is the most serious, and the influence of cavitation effect on the half cabin is weaker than that of the empty cabin, so the damage degree is the second, and the damage degree is the smallest when the cabin is full. When the distance parameter is less than 0.68, the shock wave and the after flow play a leading role in the dynamic response of the ship. When the distance parameter is between 0.68 and 1.38, the combined action of the bubble pulsating water jet and the cavitation closure multi-load causes the main damage to the ship. When the distance parameter is greater than 1.38, the bubble pulsation and the cavitation closure load play a leading role.