Open AccessDetermining the acceptable turning circle manoeuvring modes to avoid loss of efficiency of the twin propeller system
Author(s) -
Dobrin Efremov
Publication year - 2020
Publication title -
maritime technology and research
Language(s) - English
Resource type - Journals
ISSN - 2651-205X
DOI - 10.33175/mtr.2021.244703
Subject(s) - rudder , propeller , thrust , marine engineering , torque , oblique case , engineering , trajectory , control theory (sociology) , simulation , computer science , mechanical engineering , physics , control (management) , artificial intelligence , linguistics , philosophy , astronomy , thermodynamics
Nowadays, a large number of newly built inland and navy vessels are equipped with a twin propeller-twin rudder configuration (TPTR). Observations of the modes of work of each unit of the TPTR system when performing manoeuvres at curvilinear trajectory show asymmetrical loading. The nature and parameters of the phenomenon are not sufficiently studied, which in specific manoeuvres could create overloading and loss of effectiveness. The purpose of the task is to study the effectiveness of the ship’s TP system in manoeuvring, taking into account the specifics of working in oblique flow of the “internal” and “external” propellers, respectively to the trajectory of motion. Appropriate manoeuvring experiments with self-running ship model have been carried out by which the propeller thrust and torque have been measured. In the present paper, based on obtained investigation results, analysis of interaction effects in the TP system has been performed. Coefficients for estimating the asymmetric efficiency of the twin-screw system have been developed, and related conclusions were summarized.