Centrifugal compressors (CCs) are key components of marine power plants (MPPs), supporting engine boosting, boil-off gas (BOG) handling on liquefied natural gas (LNG) carriers, and auxiliary services such as heating, ventilation, and air conditioning (HVAC). However, recent publications are often fragmented by domain (aerodynamics, mechanical design, standards, and digitalization), complicating cross-domain engineering decisions for marine duty cycles. This structured review follows an explicit protocol to synthesize peer-reviewed studies (2015–2025) retrieved from Scopus and Web of Science and organizes the evidence by application class: turbocharger-integrated stages for marine diesel and gas-turbine engines, LNG/BOG compression trains, and auxiliary onboard services. The synthesis consolidates (i) aerodynamic KPIs (pressure ratio, efficiency, surge and stall margins, and operating range), (ii) mechanical and lifecycle enablers (seals, bearings, and rotordynamics), and (iii) quantified impacts of digital methods (control, diagnostics, and digital twins). Reported trends include single-stage pressure ratios of ~5.4–5.7, multistage overall pressure ratios exceeding 10, and surge-margin improvements of ~40–44% associated with advanced diffusers as well as casing and endwall treatments. Industrial case studies (non-marine) report downtime reductions of ~25–35% and maintenance-cost reductions of ~25%, while evaluated diagnostic datasets show high accuracy. Key gaps remain in marine-specific validation datasets and harmonized testing and data standards.
Работа посвящена разработке методики формирования наборов демонстрационных данных для адаптации моделей класса Vision-Language-Action (VLA) к манипуляторам с избыточными степенями свободы. Сформулирована задача управления в терминах обучения с подражанием, определены физические ограничения системы и математическая постановка целевой функции. Реализована система телеоперации на основе обратной кинематики для манипулятора с 7 степенями свободы. Получен набор данных в формате RLDS (~100 эпизодов), готовый для дообучения моделей класса VLA. Установлена связь между задачей кинематического управления в режиме телеоперации и целевой функцией имитационного обучения.
The paper describes the fleet supply processes of a shipping company and formulates the procedures for interaction between participants in the process of delivering supplies to a vessel, including the interaction of the ship’s crew with the company’s office and the subsequent interaction of the shipping company with agency and ship chandler organizations. Based on the textual description of the processes, a graphical model of the supply process is constructed using BPMN graphical notation, reflecting the interaction between process participants. The purpose of the article is to develop a graphical process model of fleet supply of a shipping company based on a textual description of the processes, enabling its further use for analysis and improvement of ship supply organization. The resulting model makes it possible to visualize the process structure and identify key points of interaction between participants. The results can be used for analysis and further improvement of ship supply organization. The object of the study is the fleet supply process of a shipping company, and the subject is the interaction between participants and the sequence of operations they perform. The main research method is a process approach based on the formalization of actions, events, and information flows between participants. The main stages of the supply process are considered, from the formation of a request by the ship’s crew to the delivery and acceptance of supplies on board. The developed BPMN-based process model makes it possible to identify features of interorganizational interaction, determine potential delay points, and assess the impact of participant interaction on overall supply efficiency. The main conclusion is that the use of process modeling provides a basis for analysis and optimization of fleet supply processes of a shipping company.
The paper proposes an algorithm for controlling the motion of an unmanned vessel and for navigating through navigational hazards in accordance with the Rules for Navigation on Inland Waterways of the Russian Federation. The relevance of the study is обусловлена the need to ensure the safety and efficiency of vessel operations through the implementation of autonomous technologies under the condition of availability of accurate onboard information about the current situation. Control is performed directly on board the unmanned vessel, i. e., autonomously, rather than based on commands from the shore. The optimal control problem is solved for a simplified center-of-mass model of a moving object. It is noted that the requirement to make real-time decisions in vessel control leads to the use of both mathematical and information models. The application of A. A. Krasovsky’s self-organizing optimal regulator with extrapolation is effective. In this work, the weighting coefficients of the PID controller are determined from analytical expressions obtained for the self-organizing optimal regulator with extrapolation. Mathematical models and algorithms are proposed for the analysis of the navigational situation, route correction, and data integration. A mathematical model of dynamics is developed, and optimal control algorithms ensuring the safety of the unmanned vessel are established. A methodology for maneuvering an unmanned vessel based on autonomous optimal situational control with avoidance of navigation hazard zones is developed. The results of computer simulation of optimal vessel motion are presented.
The article presents a critical analysis of the most widely used business process modeling notations (BPMN, EPC, IDEF0) from the perspective of their practical application. The key problems identified include semantic redundancy, a dissonance between simplicity and formal rigor, and a gap between formal process description and executability. It is concluded that the choice of a modeling notation should be context-dependent and determined by specific modeling objectives, and that a transition toward a domain-specific executable notation is required. In order to improve technological processes in water transport and to support research related to the scientific organization of labor, an original specialized executable notation is proposed. Its key advantages include an orientation toward domain-specific concepts of transport logistics, ensuring intuitive clarity for specialists, formal rigor enabling model verification, and direct execution capabilities that eliminate the stage of manual transformation of models into operational regulations. The proposed approach has been tested using the example of modeling technological processes in a seaport and has demonstrated its effectiveness in increasing transparency, manageability, and optimization of logistics operations. The generation of random event durations enables the notation to be used, unlike traditional network models, as a tool for simulation modeling of transport processes by determining the probability of executing alternative scenarios and the starting point of their execution. In this sense, the proposed approach allows, to a certain extent, for the “reservation” of managerial decisions through the advance formation of backup planning options. The software suite implementing the notation is developed in the Visual Basic for Applications (VBA) environment of the MS Excel package, as it supports the creation of macros for automating routine spreadsheet operations, generating complex reports, and developing user interfaces. This environment is characterized by a relatively low entry barrier due to its simple syntax and extensive library of builtin functions, which enables rapid adoption even by users without a specialized programming background, while the ability to record macros in real time with subsequent fine-tuning of the generated code significantly accelerates the development process.
