39 results about "Modal method" patented technology

The invention discloses a complete buckling two-dimensional dynamic simulation method of a submarine pipeline provided with initial defects introduced with a modal method. The method comprises the steps as follows: finite element software ABAQUS is applied according to geometric parameters and physical and mechanical parameters of the submarine pipeline, and a characteristic buckling mode of the submarine pipeline is computed; the finite element software ABAQUS is applied according to geometric parameters and physical mechanics of the submarine pipeline and seabed soil mass, and a model used for dynamic buckling analysis is rebuilt, and the initial defects of the submarine pipeline are introduced; and a complete dynamic buckling process of the submarine pipeline is analyzed with an explicit dynamic method. According to the complete buckling two-dimensional dynamic simulation method, a slender submarine pipeline structure can be effectively simulated; moreover, completely smooth initial defects are introduced, stress concentration is prevented, and simultaneously, a plurality of modes of the submarine pipeline are introduced in an overlapping manner, so that the purpose of simulating the initial defects in the real high-order mode can be achieved; and further, the dynamic change process of the submarine pipeline in the high temperature and the high pressure can be simulated, good astringency is provided for complete buckling computation of the submarine pipeline, and a computation result can reflect the real condition better.