Hull structure optimization and simplification calculation method based on fatigue strength

Abstract

The invention belongs to the technical field of hull structure optimization design, and particularly relates to a hull structure optimization and simplification calculation method based on fatigue strength. According to the method, the relation between the structure hot spot stress and the fatigue accumulated damage degree of the wave direction and the relation between the fatigue accumulated damage degree of each calculation wave direction and the fatigue accumulated total damage degree of a typical node structure of a hull under a specific calculation frequency of a certain calculation wavedirection are used, the fatigue strength-based hull structure optimization and simplification calculation method is provided. The method can effectively solve the problem that the position with largefatigue damage of a hull structure is usually a position with a complex structure. Compared with the problem that the calculation work is very heavy due to the fact that the calculation process of a spectral analysis method is complex, the method can greatly reduce the calculation workload, improves the calculation efficiency, and brings great convenience to the optimization design of the structural fatigue strength based on the spectral analysis method.

Description

technical field [0001] The invention belongs to the technical field of hull structure optimization design, and in particular relates to a fatigue strength-based optimization and simplification calculation method for hull structure. Background technique [0002] Fatigue damage is one of the main failure modes of the hull structure. The fatigue cracks in the structure need to be repaired in time, otherwise, the cracks will expand to a certain extent and cause catastrophic damage to the hull structure. Several major classification societies in the world have made relevant regulations on the fatigue strength check. At present, the fatigue strength evaluation methods proposed by the classification societies of various countries can be mainly divided into simplified calculation and direct calculation; direct calculation is divided into design wave method and spectrum method. Analysis. Among them, the spectral analysis method is to first calculate the target ship’s different loadi...

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Problems solved by technology

[0003] In fact, not all the initial design schemes of the hull structure can meet the design service life requirements of structural fatigue strength; therefore, in the actual evaluation of the fatigue strength of the typical hull structure, it is necessary to conduct optimal design research on the hull structure that cannot meet the design requirements. The commonly used method is to continuously modify the finite element model of the hull structure according to the formed structural optimization design scheme, and then perform spectrum analysis and calculation repeatedly. The process is shown in figure 2 ; but the location of the larger fatigue damage of the hull structure is often a very complex part of the structure, and the calculation process of the spectrum analysis is more complicated, and the calculation workload is very heavy, which brings great difficulty to the optimization design of the typical node structure of the hull

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