Estimation of Maneuverability of Trawl Fishing Vessel Using an Analytical Method

Abstract

Most fishing vessels are less than 100 m in length between the perpendiculars, for which adherence to the International Maritime Organization maneuverability standards are not mandatory. In the design stage of fishing vessels, maneuverability is estimated using empirical formulas—mainly analytical methods—rather than costly and time-consuming model tests. However, the empirical formula is developed through the process of regression analysis on the model test results from merchant ships’ hull form and applying the same to the fishing vessels’ hull form may result in an estimation error due to the differences in the vessels’ characteristics—e.g., L/B, B/d and Cb·B/L—. In a previous study, the authors of this paper derived a modified empirical formula by adding the hull form parameters of trawl fishing vessels to the existing empirical formula based on those of merchant ships. This study analyzes the validity of the modified empirical formula in depth by applying it to a newly-built training vessel that has the hull form of a trawl fishing vessel. As a result of the study, the estimation results were improved by including the parameters of the hull form of trawl fishing vessels in the empirical formula developed for merchant ships.

Prediction of Maneuverability in Shallow Water of Fishing Trawler by Using Empirical Formula

“…For these reasons, the authors conducted a study to derive a corrected empirical formula. It is expected to further improve the prediction of the maneuverability of fishing vessels by including the unique hull shape characteristic parameters of fishing vessels in the Kijima et al empirical formula, which is widely used in shipbuilding practice [2,5,20]. The schematic processes are as follows:…”

“…The large length to beam ratio (L/B) to secure sufficient hull capacity and stability are similar to low-speed large ships such as Ultra Large Crude-oil Carriers (ULCC) or Very Large Crude-oil Carriers (VLCC) [2]. Therefore, when applying the results of research performed on merchant ships to fishing vessels, appropriate corrections are required [5]. Of course, the best would be to conduct a study similar or identical to the study performed on merchant ship types on fishing vessels.…”

“…Accumulation of data on these hull shape characteristics provides high accuracy of characteristic parameters for fishing vessel types in marine accident analysis and autonomous vessel development. Studies on the prediction of the maneuverability of fishing vessels have been carried out by Yoshimura [14][15][16][17], Dan [18], Lee [3,4,19], Kim [2,5,20], etc. [21][22][23][24][25][26][27], but a lot of research is still required.…”

“…Based on a review of the state of the art, the authors conducted a study to devise an empirical maneuverability prediction formula more suitable to fishing vessels [2,7]. Through the verification process, it has been confirmed that improved results were obtained in predicting the maneuverability of a fishing vessel [5]. In this study, by applying the empirical formula of Kijima et al, which includes correcting factors of the hydrodynamic coefficients of fishing vessel hull shape obtained from the corrected empirical formula, a study was performed to predict maneuverability in shallow water.…”

“…However, in an actual ship test, because the external force is affecting as an irresistible force, it is impossible to perfectly harmonize the conditions of the simulation, and such a factor was taken into consideration. Table 6 shows the actual ship test and simulation conditions of the target fishing vessel [5,37].…”