Maneuvering analysis of a vessel equipped with two azipods using its mathematical model

• Main Authors: Pashentsev S. V., Egorov V. Yu.
• Format: Article
• Language: Russian
• Published: Murmansk State Technical University 2019-12-01
• Series: Vestnik MGTU
• Subjects: azipod; mathematical modeling; curve of the screw action; the algorithm of hoffmann; азиподы; математическое моделирование; кривые действия винта; алгоритм гофмана
• Online Access: http://vestnik.mstu.edu.ru/show-eng.shtml?art=2038
• ISSN: 1560-9278; 1997-4736

Azimuth propulsion systems (azipods, screw-steering columns, SSC) are widely used on new types of vessels intended for the implementation of large-scale projects for the integrated development of the Northern Sea Route. The main way to study the operation of such vessels is their mathematical modeling with the inclusion in the model of both the hull of the vessel and the azimuth propulsion that it is equipped with. The model is complicated when the ship is equipped with not one but two azipods, which in the process of work affect each other in a certain way. During the study, a complicated model of a ship with the displacement of about 36 thousand tons, equipped with two azipods, has been considered. The hull is described using the model in displacements, the operation of each azipod is described using the algorithm of A. D. Gofman. When determining the base value of the stop of each azipod screw (before it is turned), the action curve of the Lammeren screw has been used. Further calculations related to the rotation of the azipods and changes in the flow around the propeller blades are based on the approximation of the curves given in the A. D. Gofman reference book. The computer study of the model (both the hull of the ship and each azipod) consists in the arbitrary maneuvering of the ship to obtain kinematic (linear and angular velocities) and power (forces and moments) characteristics. The results are presented in the form of a set of graphs and a number of conclusions made based on the analysis of the obtained model data. The simulation has been carried out using a software package performed by the authors in two software and computing environments (VB6 and MathCad) and registered by the Federal Service for Intellectual Property.