DYNAMIC POSITIONING. A CASE STUDY

• Published in: Scientific Bulletin ("Mircea cel Bătrân" Naval Academy) Vol. 20; no. 1; p. 137
• Main Authors: Maftei, Constantin C, Lupu, Sergiu
• Format: Journal Article
• Language: English
• Published: Constanta Naval Academy Publishing House 15.06.2017
• Subjects: Case studies; Control systems; Deep sea moorings; Dynamic positioning; Exploitation; Forces (mechanics); Global positioning systems; GPS; Gyrocompasses; Jackup platforms; Legs (structural); Mathematical analysis; Mooring; Mooring lines; Natural gas; Navigation; Offshore; Offshore drilling rigs; Offshore oil exploration & development; Oil; Onboard; Position measurement; Positioning systems; Propulsion; Reference systems; Ships; Technology; Tension; Vessels; Wind pressure; Black Sea
• ISSN: 2392-8956; 1454-864X; 1454-864X; 2392-8956
• DOI: 10.21279/1454-864X-17-I1-010

Ship's dynamic positioning (D.P.) it's technology with a fast development, born from a necessity of a precise positioning for offshore vessels inside of oil and gas reserve exploitation industry. In 1961 the ship Eureka was the first ship which was fully accepted as a DP vessel. For keeping the vessel or structure in fix position is few methods which include spread and fixed moorings or combinations of each. The jack-up rig or vessels using moorings or legs may also occasionally have DP control systems to assist the setting-up on position and, in the case of a moored unit, to reduce mooring line tension. Each system has advantages and disadvantages.Every ship it's a subject of wind forces, waves, and tidal movements, as well of propulsion forces and of other external elements. The answer of these forces is the ship movement, produced by changing the position and heading. These are measured by position reference systems and gyrocompasses. DP control system is calculating the compensation between the measured values of position/heading and the setting values and calculates the propulsion force to be generated to reduce the errors to zero.The aim of this paper is to present a case study regarding how it work the dynamic positioning system on board the ship operating in the Black Sea.