The Research Of Dynamic Response And Impact Resistance Of Warship Structure Under The Influence Of Non-contact Underwater Explosion Shock Waves

Ship warring parties as a maritime combat platforms, from its birth, to face the impact of enemy weapons to attack the threat generated by the blast. And in modern warfare, with the development of missiles, bombs and water laser weapons, explosions and impact equivalent duration increased significantly, precision-guided weapons technology to greatly improve the hit rate, the ship’s environmental impact is even worse. Therefore, the ship during its service will inevitably be faced with the impact of environmental issues, how to improve the impact resistance of the hull structure and equipment and personnel will be directly related to the ship in combat fighting and vitality, it must be taken seriously.In this paper, theoretical analysis and numerical simulation method of combining, the dynamic response of the structure and impact of the ship cabin and a host device in a non-contact underwater explosion shock wave were studied under.In this paper, we completed the following work:(1) The basic theory of underwater non-contact explosion dynamic response of ship and impact studies.(2) The application MSC.Patran and MSC.Dytran software simulation of underwater blast, the numerical simulation results obtained with the relevant empirical formula calculation results can be obtained for comparison:When meshing calculated waters appropriate, calculated values and experience overall good agreement. Therefore, the numerical simulation method in this paper can simulate the detonation process and the underwater explosion shock wave propagation.(3) Dynamic response of underwater non-contact explosion shock wave simple stiffened panels were numerically simulated.(4) The subjects were selected ship cabin, including nacelle structure, host base and host equipment. Choose a variety of computing conditions, such as:the explosive equivalent of constant change away from the explosion (explosive means the vertical distance from the surface of the water) is formed of several conditions; or when a certain critical distance, change form explosive equivalent of several other conditions. In addition, in order to consider the side effects on different angles explosion cabincabin dynamic response, at a certain critical distance is determined and explosives equivalent, as used herein chosen for the critical distance 30m, explosive equivalent of 300kg, then were selected azimuth angle 0 explosion of 15°,30°,45°,60°. Finally, a number of locations within the cabin chosen as study points. Through changing the dynamic response calculation condition of the ship cabin cabin non-contact underwater explosion shock wave under the numerical simulation to obtain the dynamic response characteristics of structures and equipment, analyze and summarize the law.(5) Ship cabin cabin impact were studied underwater non-contact explosion shock waves under the action. Mainly consider two aspects:First, the impact study nacelle structure. Non-contact underwater explosion shock wave mode under the cabin structural damage and plastic deformation energy absorption characteristics as a reference for numerical simulation by changing the form of the structure between the double bottom girders and bottom girder structure with traditional forms of calculation results analysis and comparison, by the relevant conclusions. Second, the impact of research equipment. Conduct research on the impact resistance of the device by changing the base panel and the longitudinal web.