A Fundamental Study on Estimation Techniques for Maximum Fluctuation of Loads to a Ship Main Engine under Actual Seaway

2015 Fiscal Year Final Research Report

• Project/Area Number: 26820384
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Naval and maritime engineering
• Research Institution: National Maritime Research Institute
• Principal Investigator: Kitagawa Yasushi 国立研究開発法人 海上技術安全研究所, その他部局等, 研究員 (50579852)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 船舶推進・運動性能 / 船舶主機 / 主機負荷変動 / 不規則波 / 統計的変動量 / 主機設計

Outline of Final Research Achievements

Purposes of this research are introducing new techniques to estimate statistical significant value and maximum value for load fluctuations of ship main engines under irregular sea waves, and investigating relationships between these statistical values and design factors on main engines or installing an engine in a ship.
Firstly, mathematical models to calculate random time-series fluctuations of rotation speed of a main engine and acting propeller torque on it are introduced and validated by comparing to results of model test under regular or irregular waves. Secondly, statistical techniques to estimate significant or maximum value for random fluctuations of rotation speed of engine and acting torque are introduced, by expanding conventional statistical technique on marine engineering. Finally, relationships between these statistical values and a proportional gain of a mechanical governor of ship engine, as a design factor, are investigated by means of the sensitivity analysis.

Free Research Field

工学