Dynamic performance of double-walled cylindrical shell structure with anti-shock coating
[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 cover-ing 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,velo-city 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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