The article is devoted to the creation of a digital twin of a marine internal combustion engine. The technology brings together applications such as smart technology, global connectivity, big data, machine learning and vir-tual reality. These applications are a key component of Industry 4.0. A marine engine digital twin is a computer program that uses real-world data to create simulations that predict how an engine or its processes will work in certain situations under the influence of factors of a different nature. Combinations of the following categories of marine engine digital twin information are described: physical model and data; analytical model and data; temporary archives of parameters; transaction data; visual models; calculations. The constituent elements of digital twins are presented. The article considers the prospects for using digital twins for complex modeling of technological processes of ship power plant elements. A separate emphasis in the research process is made on the formal specification of the digital twin of a marine internal combustion engine, which will provide the logic for the presentation and processing of temporal multimodal data at the level of mathematical, algorithmic and software, taking into account the properties of these data. An algorithm for creating a multi-image of a digital twin of a marine internal combustion engine has been developed. The practical aspects of using the digital twin are presented on the example of modeling its operation. These developments are of particular relevance in the development of technologies for controlling the ship power plant of a marine autonomous surface ship
digital double, engine, model, data, process, marine autonomous surface ship
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