Open AccessTO THE QUESTION OF DEFINING ERRORS ARISING IN THE ANALYSIS OF SHIP STABILITY IN SHIP COMPUTER SOFTWARE
Author(s) -
Irina Yakuta,
Б.С. Гуральник
Publication year - 2019
Publication title -
vestnik astrahanskogo gosudarstvennogo tehničeskogo universiteta. seriâ: morskaâ tehnika i tehnologiâ
Language(s) - English
Resource type - Journals
eISSN - 2225-0352
pISSN - 2073-1574
DOI - 10.24143/2073-1574-2019-3-7-15
Subject(s) - storm , stability (learning theory) , software , meteorology , displacement (psychology) , environmental science , reliability (semiconductor) , marine engineering , computer science , engineering , geography , machine learning , programming language , psychology , power (physics) , physics , quantum mechanics , psychotherapist
The article shows the need to account the difference between real weather conditiona and weather parameters given in shipboard computer software. Taking into account the fact that climatic conditions in the oceans are getting severer, it is unsafe to rely on relevance and reliability of the shipboard software forecasts navigating in zones with extreme weather conditions. Having the opportunity on board to get enough accurate weather forecasts in advance a navigator can competently plan the future voyage and avoid the expected storm. It not always possible to calculate the divergence with the storm and a vessel can be affected by cyclonic activity for different reasons. The ships stability is considered reached if the weather criterion shows the area ratio b/a > 1 on a static stability diagram. The analysis showed that for this case b/a = 0.436, which is 2.3 times less the minimum allowable value. It is stated that in the course of a ship operation the displacement and heights of center of gravity increase on the empty ship. If the ship stability is controlled by calculations, there occur random errors of due to inaccuracy of evaluating variable load. An increase of displacement and a height of center of gravity of an empty ship, as well as accidental errors due to inaccuracy of evaluation of deadweight may reach in total over 100 tons for displacement and up to 0,20 m for elevation of center of gravity. This fact should be taken into account in the shipboard software analyses. There have been given examples of formulas determining the displacement errors and a height of center of gravity of the vessel under operational load