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Pivot point in ship manoeuvring

Artyszuk J.

Zeszyty Naukowe / Akademia Morska w Szczecinie

2010

nr 20 (92)

13-24

This paper is aimed to clarify the notion of instant pivot point (as being well established in rigid body mechanics) and review its application in practical ship manoeuvring. The extension of the Vasco Costa original results to arbitrary initial ship manoeuvring motions is performed and a transient phase of the pivot point change is studied, especially with regard to ship crash stopping and turning (including inter alia a bow thruster application).

W artkule podjęto problem położenia chwilowego środka obrotu w różnych etapach manewrowania statkiem. Wskazano na jego praktyczne znaczenie, przedstawiono ścisłe podstawy teoretyczne i wyniki symulacji dla wybranych manewrów. Wzdłużne położenie środka obrotu jest często niepoprawnie lub nie w pełni rozumiane i tym samym niewłaściwie wykorzystywane wśród nawigatorów.

Risk Analysis of Ship's Manoeuvres Carried Out on the Basis of Integrated Navigation Systems (INS) Indications

Tomczak A.

Annual of Navigation

2010

No. 16

131-139

In the safety evaluation of manoeuvres carried out on the basis of INS indications, the real ship's dimensions are used to determine navigation safety level. The paper presents a new approach to this problem. The ship's maneuvering area and collision probability were calculated incorporating uncertainty areas of ship's plan geometry at given probability level for typical configuration of navigational equipment applied in existing pilot systems. The widening coefficients of safety factors for each configuration set were determined and discussed. The most economically advantageous configuration of navigation system was chosen.

Precision of ship steering along a waterway bend with the use of ARPA information

Juszkiewicz W.

Annual of Navigation

2009

No. 15

49-53

The usage of stationary object tracking information while steering a ship along a marked waterway relies on the constant estimation of the object passing distance made by the navigator. This information is available both in the alphanumeric form (target data) and in the graphic form (relative vectors). While making decisions, the navigator has to take into consideration the limitations of ARPA devices, particularly delays in transferring information about tracked objects occurring when ships are making manoeuvres. The results of the experiment performed in the radar-navigation NMS-90 simulator, which has been conducted in order to establish the usability of the stationary object tracking information in the process of ship steering along a marked waterway are described in this article.