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- Title
Development of detailed engine model for evaluation ship performance in waves by a self-propulsion model test.
- Authors
Bondarenko, Oleksiy; Kitagawa, Yasushi
- Abstract
The analysis and understanding of the complex behaviour of a ship propulsion plant are of great importance for novel system design, control system synthesis/optimization and to sustain the safety of ship operation in harsh sea conditions. The convenient way to evaluate the design and propulsion performance of a ship in waves is by simulation combining the experimentally obtained characteristics of hull and propeller with the dynamic model of the prime mover. However, the propeller and engine compose a strongly coupled system, in which fluctuating inflow velocity into the propeller due to the wave and hull motions causes propeller torque and rotating speed fluctuations. The latter affects the response of the propulsion engine and vice versa; however, considering the propulsion system response in waves by a full-scale test is hardly possible. Thus, in the past, the authors have developed the experimental methodology of the self-propelled ship model test in which an intelligent propeller drive is controlled by a Marine Diesel Engine Simulator (MDES) providing the response of the engine model in real time, based on the measured propeller torque and speed. This paper introduces further development of MDES in which a full-state dynamic cycle-mean value engine model was introduced providing deep insight into propulsion engine responses in a real-like condition of the actual sea. The similarity of the engine responses at the ship model scale is ensured by the original method of equations transformation developed by the authors. The newly developed MDES was introduced into the self-propulsion model, and a test series in regular waves was performed. The obtained responses were compared with the results of numerical simulation of the full-scale model confirming the validity of the new development and the importance of intrinsic engine characteristics on propulsion system response in waves.
- Subjects
PROPELLERS; SHIP models; MARINE engines; ENGINES; SHIP propulsion; NAVAL architecture; DIESEL motors; TORQUE control
- Publication
Journal of Marine Science & Technology, 2022, Vol 27, Issue 1, p266
- ISSN
0948-4280
- Publication type
Article
- DOI
10.1007/s00773-021-00832-y