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

Abstract

ObjectivesIn 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. MethodsBy 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). ResultsAs 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%. ConclusionsCovering 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.

Keywords

• double-hull submarines
• underwater explosion
• anti-shock coating