Dynamic performance of double-walled cylindrical shell structure with anti-shock coating
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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，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。在外壳体外表面上覆盖层敷设时的抗冲击效果更好。 Abstract:Objectives In order to enhance the anti-shock performance of 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 inner hull is used to evaluate the shock mitigation effects by different means of anti-shock coating. 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 of laying anti-shock coating on the hull are compared, including covering it on both the inner and outer hulls (Case 2), and on the inner hull (Case 3), as well as on the outer (Case 4). Results The results show that: in Case 2, the average reduction rates in peak values of acceleration, velocity, and displacement are 94.1%, 81.2%, and 23.3% respectively, the average reduction rates in circumferential and axial micro-strain peak values 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%; in Case 4, the three values are 86.7%, 75.1%, and 20.3%, and the two values are 68.6% and 77.8% respectively. Conclusions The hull covered with anti-shock coating can effectively enhance the anti-shock performance of double-hull ships, especially for the acceleration and velocity results, and the coating on the outer hull plays a primary protective role. -
Key words:
- underwater explosion /
- double-hull ships /
- anti-shock coating
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图 3 覆盖层名义压应力−压应变曲线
Figure 3. The nominal compression stress versus compression strain of the anti-shock coating.
图 5 壳体上不同部位覆盖层敷设示意图
Figure 5. Illustration of anti-shock coating covered on the hull at various locations.
图 6 不同时刻4种工况下流体中冲击波传递特性
Figure 6. The shock wave propagation characteristics in water in the four cases.
图 7 4种工况下外流体与外壳流−固耦合面压力时历曲线
Figure 7. Time histories of pressure on the fluid-solid coupling interface between external water and outer hull.
图 9 工况3中测点及透过外壳后冲击波形态
Figure 9. The measuring points arrangement and the shock wave shape through outer hull.
图 10 用于壳体响应评估的测点布置图
Figure 10. The arrangement of measuring points for the shell response estimation
图 11 不同工况下壳体测点A1的加速度响应时历曲线
Figure 11. Time histories for the acceleration response of the hull at measuring point A1 in the four cases.
图 12 不同工况下壳体上测点A1的速度响应时历曲线
Figure 12. Time histories for the velocity response at measuring point A1 of the hull in the four cases.
图 13 不同工况下壳体上测点A1的位移响应时历曲线
Figure 13. Time histories for the displacement response at measuring point A1 of the hull in the four cases.
图 14 4种工况下壳体测点A1响应冲击谱结果
Figure 14. The shock response spectra at measuring point A1 of the hull in the four cases.
图 15 壳体不同测点速度峰值结果
Figure 15. The peak velocities at different measuring points of the hull.
图 16 壳体上双向应变测点布置图
Figure 16. The arrangement of circumferential and axial strain measurement points on the hull
图 17 不同工况下测点E1的周向应变响应时历曲线
Figure 17. Time histories of circumferential strain at measuring point E1 of the hull in different cases.
图 18 不同工况下测点E1的纵向应变响应时历曲线
Figure 18. Time histories of axial strain at measuring point E1 of the hull in different cases.
图 19 壳体上不同测点的周向应变峰值结果
Figure 19. The peak values of circumferential strain at different measuring points of the hull
图 20 壳体上不同测点的纵向应变峰值结果
Figure 20. The peak values of axial strain at different measuring points of the hull
图 21 不同工况下壳体内能响应时历曲线
Figure 21. Time histories of the internal energy of the hull in different cases.
图 22 不同工况下覆盖层吸能时历曲线
Figure 22. Time histories of the energy absorption by the anti-shock coatings in different cases.
表 1 双层壳体材料参数
Table 1. The material parameters for the double-walled cylindrical shell.
参数 数值 密度/(kg·m−3) 7 800 杨氏模量/GPa 210 泊松比 0.3 静屈服强度/MPa 345 切线模量/MPa 250 D 40 n 5 
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表 2 敷设覆盖层后壳体加速度、速度及位移峰值变化
Table 2. Variation of peak values in acceleration, velocity and displacement of the hull with anti-shock coating.
参数 工况 测点峰值变化量/% 均值/% A1 A2 A3 加
速
度2 96.6 90.5 95.3 94.1 3 64.8 55.8 60.5 60.4 4 95.9 78.6 85.5 86.7 速
度2 78.4 84.1 81.1 81.2 3 44.3 43.9 47.9 45.4 4 75.4 75.6 74.3 75.1 位
移2 22.2 25.7 21.9 23.3 3 0.6 −0.6 −6.3 −2.1 4 19.4 22.9 18.8 20.3
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表 3 敷设覆盖层后壳体微应变峰值变化
Table 3. Variation of peak values in micro-strain of the hull with anti-shock coating
参数 工况 测点峰值变化量/% 均值/% E1 E2 E3 E4 周向应变 2 54.9 55.6 70.8 89.6 67.7 3 21.8 32.3 66.3 17.4 34.6 4 56.2 61.9 71.0 85.3 68.6 纵向应变 2 86.0 88.7 91.7 86.7 88.3 3 61.4 66.7 70.3 73.4 68.0 4 74.9 77.6 80.3 78.5 77.8
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