A Study on a Mathematical model to evaluate ship motions and the manoeuvrability in adverse weather conditions.

2015 Fiscal Year Final Research Report

• Project/Area Number: 26820385
• 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: Suzuki Ryosuke 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 (20711328)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 6自由度船体運動時系列計算 / 荒天下の船体動揺 / 操船限界 / 最低機関出力

Outline of Final Research Achievements

In this research, a six degree-of-freedom (6DOF) mathematical model to estimate manoeuvring motion of a ship in adverse weather conditions in which the ship speed decreases to almost zero knot is developed on the basis of the equations of manoeuvring ship motion in waves in Horizontal Body Axes proposed by Hamamoto et. al.. Variations of self-propulsion factors and interaction factors between a hull and the propeller in high propeller loading conditions, which is experimentally investigated, are considered in the developed model.
Manoeuvring ship motions in adverse weather under autopilot conditions of a VLCC are calculated as an example and minimum required output of an engine in order to navigate safely are investigated. As the result, it is revealed that the VLCC can’t satisfy minimum speed ensuring manoeuvrability in head seas of adverse weather that is equivalent to Beaufort scale of wind 7.

Free Research Field

船舶海洋工学