| Citation: | XING X B，TAN J F，YANG Y X，et al. An efficient analysis method of helicopter fuselage bullet damage based on bullet penetration theory[J]. Journal of Beijing University of Aeronautics and Astronautics，2025，51（9）：3212-3221 （in Chinese） doi: 10.13700/j.bh.1001-5965.2023.0450
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The shape and structure of helicopter fuselage are complicated. Finite element simulation of helicopter fuselage bullet damage has a high computing burden and is time-consuming, which makes it difficult to be applied in rapid analysis and evaluation of helicopter fuselage bullet damage in complex multi-bullet environments. In view of this, an efficient analysis method of helicopter fuselage bullet damage was proposed by coupling the bullet penetration theory and the model of projectile impact. The results obtained from the method were compared with those of experiment and finite element simulation to validate its accuracy. Then, the helicopter fuselage impact coordinate, residual velocity, and fuselage damage area under multi-bullet attack were studied. The results show that the residual velocity calculated by the efficient analysis method is in agreement with the experimental result. The maximum error of the residual velocity of the projectile body and the maximum error of the fuselage damage area are 4.7% and 9.56%, respectively for the proposed method compared with the finite element simulation of bullet damage. Additionally, the efficiency of the present method is obviously improved as the computational time is reduced by 92.1%. With the increase of the incidence angle of the projectile body, the residual velocity decreases, and the damage area increases. When the incidence angle is too large, the projectile body cannot penetrate the surface of the fuselage, which results in flume-like skid damage and a large area of damage.
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