敷设抗冲覆盖层的双层圆柱壳抗冲性能研究

Dynamic performance of double-walled cylindrical shell structure with anti-shock coating

  • 摘要:
    目的 旨在研究双壳体潜艇非接触水下爆炸下的抗冲性能,提出在壳体表面敷设抗冲覆盖层的防护方法,以内壳冲击响应为评价指标,研究不同敷设方式下的抗冲击效能。
    方法 采用声−固耦合法,建立外流场−外壳体−舷间水−内壳体的非线性流−固耦合冲击动力学模型,对内外壳外表面均敷设覆盖层(工况2)、仅内壳外表面敷设覆盖层(工况3)和仅外壳外表面敷设覆盖层(工况4)情况下的壳体冲击响应及覆盖层抗冲击效能进行对比分析。
    结果 结果表明,对于工况2,内壳体迎爆面不同测点处的加速度、速度和位移峰值平均降低量分别达94.1%,81.2%和23.3%,周向和纵向微应变峰值平均降低量达67.7%和88.3%;对于工况3,相应值分别为60.4%,45.4%和−2.1%,以及34.6%和68.0%;对于工况4,相应值分别达86.7%,75.1%和20.3%,以及68.6%和77.8%。
    结论 针对双壳体潜艇,在壳体上敷设抗冲覆盖层可有效降低内壳冲击响应,尤其是加速度和速度响应。在外壳体外表面上敷设覆盖层时的抗冲击效果更好。

     

    Abstract:
    Objectives In order to enhance the anti-shock performance of a double-hull submarine against non-contact underwater explosions, a method of plastering anti-shock coating on the surface of double-hull ships is proposed, and the shock response of the inner hull is used to evaluate the shock mitigation effects of different anti-shock coating approaches.
    Methods By employing the acoustic-solid coupling method, a nonlinear fluid-structure coupling dynamic model is established for the external flow field, outer hull, gapped water and inner hull. Three approaches to laying anti-shock coating on the hull are compared, namely covering it on both the inner and outer hulls (Case 2), on the inner hull (Case 3) and on the outer hull (Case 4).
    Results As the results show, in Case 2, the average reduction rates in the peak values of acceleration, velocity and displacement are 94.1%, 81.2% and 23.3% respectively, while the average reduction rates in the peak values of circumferential and axial micro-strain are 67.7% and 88.3% respectively; in Case 3, the three values are 60.4%, 45.4% and −2.1%, and the two values are 34.6% and 68.0%; and in Case 4, the three values are 86.7%, 75.1% and 20.3%, and the two values are 68.6% and 77.8%.
    Conclusions Covering the hull with anti-shock coating can effectively enhance the anti-shock performance of double-hull ships, especially in terms of the acceleration and velocity results, and coating the outer hull plays a primary protective role.

     

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