An abstract approach toward the structural digital twin of ship hulls: A numerical study applied to a box girder geometry

Abstract

Condition monitoring (CM) of ship hull structures is a promising field that has recently attracted the interested of researches. The main challenge behind CM is to develop a system that gets as input sensor readings from the structure and provide the damage locus as an output. In this regard, the current study proposes two alternative CM digital twin schemes for solving this inverse engineering problem. The first one is based on a Finite Element (FE) – Optimization cooperative framework that solves several times the model until the predicted strains match the measured ones and as such the damage location has been found. The other scheme is based on a cooperative framework of Artificial Neural Networks (ANNs) used for classification and fitting, that may be regarded as surrogated models which provide solutions instantaneously. The ANNs are trained through the numerical solutions provided by the FE model. A thin-walled hollow cantilever beam, that resembles a hull-girder subjected to principal stresses under vertical bending, has been adopted. The performed work has allowed for the selection and evaluation of the locations for sensor placement and the estimation of the damage sensitive area for monitoring. Both CM digital twin schemes have proven to be promising for the theoretical simplified examined case.

Segmentation, Detection, and Tracking of Stem Cell Image by Digital Twins and Lightweight Deep Learning

“…A stem cell is a type of cell that can produce other cells which are able to develop into any kind of cell in the body, so it is also known as the origin of cells. Stem cells are cells with unlimited or immortal self-renewal capacity, which can produce at least one type, highly differentiated progeny cells, so they are called “universal cells” in the medical profession [ 9 – 11 ]. According to the classification of developmental stages, stem cells can be divided into embryonic stem cells and adult stem cells [ 12 – 14 ].…”

A Theoretical Analysis Method of Spatial Analytic Geometry and Mathematics under Digital Twins

“…Before product production, the simulation of the whole production process and products with different performance can be realized. Finally, the prediction of the production process and possible product problems is achieved, shortening the time of offline products [18].…”

Ship’s Digital Twin—A Review of Modelling Challenges and Applications

“…The SDT concept relies on data it would expect for the advanced data modelling methods, such as artificial intelligence, used in [8][9][10][11][12], and data-driven modelling (DDM), used in [12][13][14], to take prime in this area. However, conventional mathematical models have often been used for the purposes of creating an SDT, as in [15][16][17][18][19][20][21][22].…”

“…SDT applications found in papers [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] were analysed according to the standards of the DT formulation process set in this paper. For every case study, methods used to form a DT, applications, and steps of the DT formulation process were analysed.…”