Rapid acquisition method for structural strength evaluation stresses of the ship digital twin model

Abstract

The existing ship hull structure stress monitoring can only give the stress state of typical measuring points, but the monitoring point may not be the most dangerous location of the ship hull structure. To solve this problem, this paper carried out the research of ship strength digital twin. Concretely, to meet the real-time requirements for obtaining the structural stress state, this paper proposed a rapid acquisition method for structural strength evaluation stresses of the ship digital twin model, which realizes the rapid acquisition for structural yield strength evaluation stresses at the monitoring point and the non-monitoring point. To illustrate the specific application and application effect of the proposed method, the amidships three compartments section of a 21,000TEU ultra-large container ship was selected as the research object. And the case that this research object may suffer from the vertical wave bending moment and the horizontal wave bending moment simultaneously was considered. Related studies show that the proposed method can accurately recognize the load actually suffered by the ship monitoring structure. And the specific meaning of the ship monitoring structure referred to here is the ship hull structure that requires structural stress state monitoring. At the same time, related studies also show that the maximum error of the calculation results obtained by the proposed method does not exceed 0.0005% in obtaining the structural yield strength evaluation stress at the monitoring point, while the maximum calculation error does not exceed 0.032% in obtaining the structural yield strength evaluation stress at the non-monitoring point.