Estimation of Maneuverability of Fishing Vessel Considering Hull-Form Characteristics

Abstract

Fishing vessels with a length (LBP) of less than 100 m are generally not required to comply with the mandatory IMO Ship Maneuverability Standards. Therefore, an analytical method using empirical formula is preferred rather than a model test, which consumes a lot of time and monetary resources in estimating the maneuverability at the design stage. However, most empirical formulas have been derived from the model test results of merchant ships, and in the process, estimation errors may occur when hull-form parameters (L/B or CbB/L) with high correlation are applied to fishing vessel hull form whose characteristics are different from those of merchant ships. Therefore, a modified empirical formula was derived from previous research by including major parameters of fishing vessel hull form in the Kijima 90 empirical formula. In this study, maneuverability of stern trawler hull form is estimated for validating a modified empirical formula. The study confirmed that including characteristic parameters of the fishing vessel hull form in the empirical formula developed for merchant ships could improve the accuracy of estimation.

Estimation of Maneuverability of Trawl Fishing Vessel Using an Analytical Method

“…In the process of estimating the maneuverability of a vessel using empirical formulas, the main specifications and hull form characteristics of the vessel may affect the estimation accuracy, as described in Section 2.2. The authors of this paper have already confirmed in a previous study that the hull form of fishing vessels has unique characteristics that are somewhat different from those of the merchant ships' hull form [8,10]. To estimate the maneuverability of the fishing vessels' hull form more accurately, a modified empirical formula was derived from Kijima et al (1990) original empirical formula.…”

“…However, since fishing vessels relied on the empirical formula rather than model tests, there was a limitation for collecting model test results for fishing vessels to derive an empirical formula tailored to fishing vessels. In light of this, the authors previously conducted a study to modify the empirical formula originally developed for merchant ships' hull form so that it could be applied to fishing-type vessels as well [5][6][7][8]. The model empirical formula used for this study was the one proposed by Kijima et al (1990).…”

“…The error occurring for the model fishing vessels' hull form was corrected using the average value for the trend line indicated by the graph. From the results above, a modified empirical formula was derived to improve the estimation of maneuverability for fishing vessels' hull form; the results are shown in Equation (8). However, the modified empirical formula drew a limited set of hull forms from trawl fishing vessels.…”

“…Therefore, studies on maneuverability are usually conducted only for specific vessels. Studies performed by Yoshimura [2,3], Dan [4], Lee [5][6][7], and Kim [8] are representative of those that estimate maneuverability in vessels less than 100 m in LBP but are insufficiently compared to studies on merchant ships' hull form.…”

“…From the results above, a modified empirical formula was derived to improve the estimation of maneuverability for fishing vessels' hull form; the results are shown in Equation (8). However, the modified empirical formula drew a limited set of hull forms from trawl fishing vessels.…”