A Procedure for the Dynamic Positioning Estimation in Initial Ship design

Syed Marzan Ul Hasan (Ecole Centrale de Nantes, University of Rostock)

CHALLENGE - The importance of Dynamic Positioning (DP) is growing because of the increase in the number of offshore construction sites requiring DP for their operations. Due to the high complexity of the calculation process, a few institutions are able to estimate the station-keeping capability of vessels. 

SOLUTION - The paper describes the background studies, methodology, and mechanism associated with the formulation and development of a reliable design tool to calculate DP capability, versatile enough to be integrated into the initial ship design stage of a vessel. The static force balance is obtained by suitably predicting thrust requirements for the propulsion system, bearing in mind the power and positional constraints. The optimization of thrust values, considered as the backbone of the static DP estimation, is verified against standard commercial optimization program modeFRONTIER to check the convergence as well as the precision of the results. 

BENEFITS - The final parameters obtained from the process are matched with the excel solver results to confirm the reliability of the excel optimization process. The excel results for thrust and azimuth angles shows good agreement with the ModeFrontier values.