Design Of Protective Structure In Ship Under Impact Loading And Its Numerical Technology

The ships are inevitable in danger of being threatened by the strong impact loadings such as the great impact resistance during ship collision and grounding accidents for cargo ships as well as the underwater explosion loading for naval ships. Catastrophic aftermaths will be brought under the strong impact loading, such as personnel loss, vessel sinking and so on. Consequently, it is of great significance to investigate the anti-shock performances of ship and then to improve the anti-shock performances of protective structure correspondingly.Based on the method of numerical simulation, the anti-shock performances of protective structure and its improved design are investigated in the paper. For the cargo ships, the impact loading is the impact resistance during ship collision, and for the naval ships the corresponding loading is underwater explosion loading. In details, the main contents of the paper are as follows:(1) From the theoretical research, experimental research and numerical simulation, these three aspects, summary and analyzed the field of a ship impact study of the status at home and abroad. Analyze the advantages and disadvantages of three kinds of research methods, briefly describes the main research work and methods of this paper.(2) Derived, introducing the ship motion control equation and its finite element solution methods, focused on the numerical simulation of ship collision and finite element modeling of the key technologies and processing techniques.(3) For the traditional double-side structure characteristics of the collision problem, using finite element analysis software ABAQUS, to analyze collision damage process in the collision energy absorption characteristics and injury characteristics. Design three kinds of new side structure. Through the collision process, numerical simulation and a comparative study of analysis of four kinds of side structure in the inner plate broken broadside, analyze their energy absorption capacity and anti-collision performance.(4) By numerical simulation to study underwater explosive effects. Against the ship-board aircraft to conduct the dynamic response analysis of underwater explosion, through different forms of reinforced form, compare the response results, get the basic law of underwater explosions, and explore the different grid density on the calculation accuracy of the impact. And then, select a typical Compartment of one vessel's amidships to conduct a Numerical Simulation of a typical non-contact explosion underwater, conduct dynamic response analyze of different explosion situations. Design a new type of broadside protective structure, through the finite element simulation and comparative, analyze their impact-resistance performance.(5) To investigate the anti-shock performances of local structure in warship, the experimental model should be choosed properly. Firstly, five schemes of test models are proposed and then the anti-shock performances of theses models are evaluated by numerical simulation. By the comparison of main results such as stress and impact environment, it can provide some valuable reference for the choice of local structure test model.