The problem of the parametric design of ship hull structures is considered here. The parametric design of ship hull structures is intended to determine the dimensions of structural elements that meet the requirements of regulatory documents (Rules of Classification Societies/Strength Standards). It is shown that, in all existing shipbuilding CAD-CAM systems, the problems of the parametric design of ship hull structures are essentially not affected. A modern methodology for the parametric design of hull structures is proposed, which defines a set of principles for the structural and logical organization of the design process, methods, and technical means for implementing design procedures. The most characteristic methodological principles of the parametric design of ship hull structures and other offshore engineering structures are identified: A systematic approach; modeling as one of the main methods for solving design problems; and a rational design strategy based on iterative search procedures that implement the methodological principle of successive complication of models and procedures for designing structures. The article considers the architecture and methodological foundations of the system for automated parametric design of ship hull structures (CADS-Hull), developed at the Saint Petersburg State Marine Technical University, Russia. The system is intended for use in design bureaus when designing civil ship hull structures on the basis of regulatory requirements of the Russian Maritime Register of Shipping and IACS General Rules in terms of large-capacity tankers, bulk carriers, and container ships.

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Крыловский государственный научный центр (Санкт-Петербург, Российская Федерация) В. Н. Тряскин Санкт-Петербургский государственный морской технический университет (Санкт-Петербург, Российская Федерация) Статья поступила в редакцию 11 апреля 2019 г. На основании анализа особенностей формы корпуса в носовой и кормовой оконечностях современных судов ледового плавания, включая суда двойного действия, предлагается оригинальная методика построения зависимостей для определения параметров ледовых нагрузок на оконечности судов, имеющих ледовую категорию Российского морского регистра судоходства (РМРС). С учетом разработанной методики предложены рекомендации по определению расчетных ледовых нагрузок на оконечности судов двойного действия, вошедшие в проект требований Правил РМРС к конструкции ледовых усилений корпуса судов, предназначенных для эксплуатации кормой вперед. Ключевые слова: суда двойного действия, ледовые нагрузки, Российский морской регистр судоходства, Правила Российского морского регистра судоходства.

The article deals with some issues of geometric modeling of ship hull structures in specialized CAD system. Stiffened shells and platings should be idealized as a set of elementary plate panels for the purpose of structural design using local strength and buckling requirements. In the process of geometric modeling and creating the database for calculation, a special searching algorithm for closed loops of every panel should be used. This algorithm is to have good performance and versatility. In this paper, the authors suggest an original algorithm used in CADS-Hull software developed in SMTU. It is based on a regular field of points generation within the large contour of the considered structure. A series of rays is built from every point to find intersections. It is shown that this algorithm is quite good for structures (expansions, decks, bulkheads, etc.) with non-orthogonal boundaries. Some tasks for logical operations with found panels are also discussed. One of them is the clipping of a panel or plate polygon by boundaries of a considered structure (expansion contour, hull lines). The authors developed a generic method of polygons clipping. It is based on a rotation of clipping convex polygons together with the clipped polygons. All faces of the latter that are in the negative half-plane are removed. Some problems of collecting data for every found panel are discussed. An original algorithm of smaller and larger size definition for irregular and triangular panels is also given in this paper.

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