The marine engineering is transforming from the traditional industrialization to the intelligent development direction. Dynamic cables are subjected to the challenge that it is difficult to obtain the real-time cross-sectional stress distribution

and the in-service safety cannot be effectively guaranteed. In this paper

digital twin technology for safety operation and maintenance of marine dynamic cables is proposed. The model is composed of a physical cable

a virtual-reality interaction model of cable

and a digital twin model. Firstly

limited inclination values are substituted into the dynamic cable configuration reconstruction algorithm to obtain the axial force and bending moment. Then

the cable are discretized into several sub-segments. The axial forces and bending moments at both cross-sectional ends are inputted into the stress reconstruction algorithm as boundary conditions

to achieve the real-time monitoring of cable cross-sectional stress distributions. Moreover

the digital twin model is divided into 10 000 segments

and the safety conditions of the global cable can be accurately mapped with 3 inclination sensors. The feasibility of the proposed model is verified by experimental and numerical simulation methods

the maximum reconstruction errors of cross-sectional axial and contact stresses under severe sea state are 13.03 MPa and 22.18 MPa

with an average relative reconstruction error of 2.88%

and a computational time of 2.93 s. The results show that the proposed model exhibits good accuracy and real-time performance in the safe operation and maintenance of dynamic cables.