Ice and structure dynamic coupling calculation method considering geometric nonlinearity

Abstract

The invention belongs to the technical field of polar region engineering material strength calculation, and particularly relates to an ice and structure dynamic coupling calculation method considering geometric nonlinearity. Dynamic coupling calculation of the ice body and the cantilever beam structure is carried out in a mode of combining near-field dynamics and a finite element method, coupling of nonlinear dynamic effects of ice and the structure can be achieved, and the method has the advantages of being high in efficiency, accurate in calculation result and the like. The ice body impact load is solved according to a near-field dynamics method, the ice load acts on a cantilever surface element in a point-to-surface mode, a total stiffness matrix and an equivalent node force are formed by using a nonlinear dynamic finite element, a stress and strain of a cantilever beam are calculated by using the nonlinear finite element method, the new configuration of the cantilever beam is taken as a contact boundary to resolve the ice load, the stiffness matrix and the unbalanced force of the deformed cantilever beam are continuously solved, iterative calculation is carried out, and a final nonlinear dynamic coupling result of the ice body and the cantilever beam is calculated by judging whether the unbalanced force is converged or not.

Description

technical field [0001] The invention belongs to the technical field of calculating the strength of polar engineering materials, and in particular relates to a dynamic coupling calculation method for ice and structures considering geometric nonlinearity. Background technique [0002] The opening of the Arctic shipping lanes has made polar engineering a new research hotspot. However, when polar projects such as polar ships and polar propellers are operating normally, they will inevitably encounter sea ice interference. The strong interaction between ice and polar structures has also become a new universal problem in polar engineering research. In the existing research considering ice solidification, solids are mostly treated as rigid bodies, and less attention is paid to the deformation response of solids themselves. However, in real engineering environments, structures often undergo certain deformations under the action of ice bodies. The deformation of the structure will le...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems existing in the existing ice-solid linear dynamic coupling prediction method that the influence of structural geometric nonlinearity cannot be accurately simulated, and to provide a dynamic coupling calculation method for ice and structures that considers geometric nonlinearity

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