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Dalian, China

Cheng S.-Q.,Unit No. 91439 of PLA | Zong Z.,Dalian University of Technology | Chen G.-J.,Unit No. 91439 of PLA
Binggong Xuebao/Acta Armamentarii

When the surface ship subjects to underwater explosion, the cavitation near the structures and free surface may appear, and it can effect on the structure responses. The cavitation collapse can cause the secondary shock damage of the structures. This paper first calculates the shape of the bulk cavitation zone, and then simulates the initiation, expansion, contraction and collapse of cavitation by using ABAQUS code. It shows the existence of the secondary shock load and validates that the load magnitude can reach to the shock wave level. Source

Jia Z.,Unit No. 91439 of PLA | Song J.-L.,Unit No. 91439 of PLA | Jin H.,Unit No. 91439 of PLA | Zhang S.-H.,Unit No. 91439 of PLA | Chen G.-J.,Unit No. 91439 of PLA
Binggong Xuebao/Acta Armamentarii

The underwater explosion of a cylindrical shell was simulated numerically with general analysis software ABAQUS to obtain the shock environment of the shell's key parts and provide the input conditions for the shock response signal analysis. Empirical mode decomposition method was used to analyze the shock response signal and calculate Hilbert amplitude spectrum and energy spectrum, and the energy spectrum obtained is more detailed and accurate than that obtained from the traditional signal processing method. The analysis results show that the shock response signal of underwater explosion includes abundant frequency components in a wide-band, and it is transient and has high energy, but attenuates rapidly, thus can easily lead to partial destruction of the structure. The bubble oscillation response has the characteristics of low frequency, slow attenuation and long duration, and its response frequency is close to the natural frequency of the cylindrical shell, thus can easily lead to overall destruction of the structure. The research results are valuable in evaluating the vulnerability of submarines. Source

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