Naslov
Mathematical model of ship speed drop on irregular waves

Autori
Sulovsky, Ivan ; Prpić-Oršić, Jasna

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
5th My First Conference / - , 2021, 1-5

Skup
5th My First Conference, September 2021

Mjesto i datum
Rijeka, Hrvatska, 23.09.2021

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Domaća recenzija

Ključne riječi
Mathematical model ; Ship speed drop ; Irregular waves

Sažetak
Estimating the speed of a vessel in rough seas is a major challenge for engineers and scientists due to complex interactions and dynamic effects between the sea and the vessel. In this paper, mathemical model for ship speed drop in irregular waves is presented. The calculation is developed for head seas with regards to ITTC-57 wave spectrum and it is based on equilibrium between total resistance of a ship and required thrust. Since the wave height and period are highly stochastic in nature, their distribution is modelled as a random process in time domain. Values of still water and added resistance are calculated from external software and imported into original code. Thrust values are considered constant with minor oscillations due to change of wake behind the ship screw. Lastly, differential equations are solved using Runge-Kutta 4th order method. Complete mathematical model is proposed in [1]. This model takes into account ventilation effect of a screw behind a ship, wind resistance and ship inertia. It can be improved by taking into account added mass of water moving along with the ship. Model presented in this paper is written solely in Python Spyder.

Izvorni jezik
Engleski

Znanstvena područja
Brodogradnja

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