scholarly journals Estimation of Maneuverability of Fishing Vessel Considering Hull-Form Characteristics

2021 ◽  
Vol 9 (6) ◽  
pp. 569
Author(s):  
Su-Hyung Kim ◽  
Chun-Ki Lee ◽  
Sang-Min Lee
Keyword(s):  
Model Test ◽  
Empirical Formula ◽  
Design Stage ◽  
Test Results ◽  
Fishing Vessel ◽  
Empirical Formulas ◽  
Estimation Errors ◽  
Hull Form ◽  
Fishing Vessels ◽  
Ship Maneuverability

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.

scholarly journals Estimation of Maneuverability of Trawl Fishing Vessel Using an Analytical Method

2021 ◽  
Vol 9 (8) ◽  
pp. 854
Author(s):  
Su-Hyung Kim ◽  
Chun-Ki Lee
Keyword(s):  
Regression Analysis ◽  
Empirical Formula ◽  
Estimation Error ◽  
Design Stage ◽  
Test Results ◽  
Fishing Vessel ◽  
Empirical Formulas ◽  
Hull Form ◽  
Fishing Vessels ◽  
Trawl Fishing

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.

A Seakeeping Study of the UBC Series

1997 ◽  
Vol 34 (01) ◽  
pp. 10-23
Author(s):  
Sander M. Calisal ◽  
David Howard ◽  
Jon Mikkelsen
Keyword(s):  
British Columbia ◽  
Measurement Procedure ◽  
Collection System ◽  
Fishing Vessel ◽  
The West ◽  
Hull Form ◽  
University Of British Columbia ◽  
Fishing Vessels ◽  
Seakeeping Performance ◽  
The University

The University of British Columbia (UBC) and the British Columbia Research Incorporated (BCRI) collaborated to design a fishing vessel suitable for use on the west coast of Canada. This vessel, called the UBC Series parent hull form, was designed to have a large aft deck area and a volumetric coefficient comparable to those of modern Canadian fishing vessels. The resistance characteristics of this hull were improved without compromising on functionality and usable space. A resistance algorithm developed from the results for a systematic series of low-L/B displacement-type vessels, the UBC Series, was previously published (Calisal&McGreer, 1993). However, during the design process, the seakeeping performance of the vessel was never addressed. This paper describes the seakeeping performance of the UBC series in head seas. An algorithm, developed from the results of the model tests, can be used to calculate the seakeeping response of similar low L/B vessels. To calibrate the seakeeping measurement procedure, tank instrumentation, and data collection system, the ITTC Standard Seakeeping hull form (the S-175 hull form) was tested and the results were compared against published results for this hull form. The same techniques used for the standard hull form were then used to measure the seakeeping performance of the UBC Series. Possible application of the algorithm for non-UBC Series forms is also discussed.

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

2021 ◽  
Vol 9 (12) ◽  
pp. 1392
Author(s):  
Su-Hyung Kim ◽  
Chun-Ki Lee ◽  
Yang-Bum Chae
Keyword(s):  
Shallow Water ◽  
Empirical Formula ◽  
High Speed ◽  
International Maritime Organization ◽  
Fishing Vessel ◽  
Fishing Vessels ◽  
Marine Accidents

The length between perpendiculars (LBP) of most fishing vessels is less than 100 m. Thus, they are not subject to the International Maritime Organization (IMO) maneuverability standards, affecting research on maneuverability. However, upon referencing the statistics of marine accidents related to vessel maneuvering, the number of marine accidents caused by fishing vessels is 3 to 5 times higher than that of merchant ships. Therefore, systematic and consistent research on the maneuverability characteristics of fishing vessels is surely required. In particular, a fishing vessel frequently enters and departs from the same port and often sails at high speed due to familiarity with the characteristics of the situation, which may cause maneuvering-related accidents. In this study, the maneuverability of a fishing vessel in shallow water was predicted using an empirical formula. The results of this study are expected to not only be of great help in conducting simulations when analyzing marine accidents involving fishing vessels, but will also provide unique parameters of fishing vessels that lead to developing autonomous vessels.

Model Test Research on Soil-Landslide Surge by River Channel Reservoir

2013 ◽  
Vol 353-356 ◽  
pp. 2610-2613
Author(s):  
Li Chen ◽  
Ping Yi Wang ◽  
Tao Yu ◽  
Fan Zhang ◽  
Yong Qiang Men
Keyword(s):  
Experimental Data ◽  
Influencing Factors ◽  
Model Test ◽  
Empirical Formula ◽  
Exchange Process ◽  
River Channel ◽  
Test Results ◽  
Generalized Model ◽  
Landslide Occurrence

By fully collected and surveyed on the soil landslide, with the help of generalized model, the experiment simulated the landslide occurrence and exchange process of soil landslide entered the water. Through the calculation and analysis of test results and influencing factors, it is given out the height of the initial surge, variation of the progressive surge and empirical formula of soil-landslide surge. Compared with experimental data, it is found that empirical formula has certain accuracy and it can provide a certain reference on surge disaster forecast.

scholarly journals An Optimization Study on the Hull Form and Stern Appendage for Improving Resistance Performance of a Coastal Fishing Vessel

2021 ◽  
Vol 11 (13) ◽  
pp. 6124
Author(s):  
Jin-Won Yu ◽  
Min-Kyung Lee ◽  
Yang-Ik Kim ◽  
Sung-Bu Suh ◽  
Inwon Lee
Keyword(s):  
Fuel Efficiency ◽  
Variation Method ◽  
Design Parameters ◽  
Fishing Vessel ◽  
Hull Form ◽  
Fishing Vessels ◽  
Optimization Study ◽  
Principal Dimension ◽  
The Republic ◽  
Hull Forms

In response to the increasing number of free trade agreements (FTA) and the Trans-Pacific Partnership (TTP), it is necessary to develop next-generation fishing vessels for the littoral sea of the Republic of Korea. The main objectives of such fishing vessels are to enhance the comfort of the crew and to improve fuel efficiency under the newly established principal dimension. This paper employs the hull form variation method to obtain a series of forebody hull forms of the 19 gross tonnage class of a coastal composite fishing vessel. Chine breadth modification has been used for hull form variations. The objective function is the minimum value of wavemaking resistance. A parametric study was conducted to observe the effects of design parameters on the objective functions, and hull-form optimization was performed. In addition to the hull-form optimization, the effect of the stern flap was investigated in terms of both resistance and operational performances.

A Resistance Study on a Systematic Series of Low L/B Vessels

1993 ◽  
Vol 30 (04) ◽  
pp. 286-296
Author(s):  
Sander M. Calisal ◽  
Dan McGreer
Keyword(s):  
West Coast ◽  
Resistance Test ◽  
Series Data ◽  
Test Results ◽  
Fishing Vessel ◽  
Hull Form ◽  
Small Vessels ◽  
Design Speed

Model resistance test results for a systematic series of low L/B, displacement-type vessels are presented. The UBC Series is based on West Coast seiners and trawlers. These vessels have low L/B and L/V⅓ values that are outside the range of existing model series data. A parent hull form was developed that has 14 percent less resistance and yet has the same displacement and deck area of a typical fishing vessel. A series of 13 models was generated by systematically varying L/B, B/T and Cb. Algorithms are presented for calculation of the resistance of similar small vessels for two loading drafts. Results of side bulb applications reduced the resistance of the parent hull at design speed by an additional 16.6 percent. The parent hull form is designed as a developable hull form.

scholarly journals On the High-Performance Hydrodynamics Design of a Trimaran Fishing Vessel

2021 ◽  
Vol 83 (1) ◽  
pp. 17-33
Author(s):  
Kurniawan Teguh Waskito ◽  
Yanuar
Keyword(s):  
High Performance ◽  
Fishing Vessel ◽  
Hull Form ◽  
Fishing Vessels ◽  
Strip Theory ◽  
Significant Difference ◽  
Multihull Ship ◽  
Ship Speed ◽  
Motion Amplitude ◽  
Rough Sea

Trimaran hull form as multihull ship becomes more attractive these days in various ship types. It offers more advantages in terms of seakeeping performances, particularly on the application of a fishing vessel. However, thus far, the conventional design of fishing vessels is not favorable to ensure the safety of a vessel sailing in a rough sea. In conjunction with such issues, we discuss a trimaran fishing vessel design based on the seakeeping criterion to evaluate the dynamic stability, ship motion RAOs, and ship resistances at the initial design stages using linear strip theory. The intact stabilities are calculated to complement the seakeeping results. The analytical method based on the slender body method is used to evaluate the steady wave resistances. The results of heave, pitch, roll motions, and the ship resistances are discussed. At the zero speed and forward speed, the trimaran shows a favorable motion amplitude, although in forward speeds at the case of head seas there is no significant difference. The trimaran presents a favorable steady-resistance up to the ship speed of Fn=0.27, and it becomes deteriorating than the monohull at higher ship speeds. However, the added wave resistances of the wavelength range 1.0 – 3.0 shows significant added resistances at Fn=0.25 and Fn=0.35, respectively. The results of this study present promising seakeeping and resistance characteristics of the trimaran hull form. The trimaran hull form ensures the safety, reliability, and operation efficiency of ships sailing in broader ranges of violent-sea environment.

Prediction of Residual Resistance Coefficient of Low-speed Full Ships using Hull Form Variables and Model Test Results

2019 ◽  
Vol 56 (5) ◽  
pp. 447-456 ◽  
Author(s):  
Yoo-Chul Kim ◽  
Myung-Soo Kim ◽  
Kyung-Kyu Yang ◽  
Young-Yeon Lee ◽  
Geun-Tae Yim ◽  
...  
Keyword(s):  
Model Test ◽  
Resistance Coefficient ◽  
Test Results ◽  
Hull Form ◽  
Residual Resistance ◽  
Low Speed

UJI TARIK HIDRODINAMIKMODEL KAPAL BERSAYAP WiSE DENGAN LAMBUNG DASAR BERSTEP

2013 ◽  
Vol 12 (3) ◽  
Author(s):  
Iskendar Iskendar ◽  
Andi Jamaludin ◽  
Paulus Indiyono
Keyword(s):  
Comparative Study ◽  
Model Test ◽  
Hydrodynamic Model ◽  
Surface Effect ◽  
Center Of Gravity ◽  
Test Results ◽  
Flat Bottom ◽  
Towing Tank ◽  
Test Models ◽  
Wetted Surface Area

This paper describes hydrodynamic model tests of Wing in Surface Effect (WiSE) Craft. These craft  was fitted with  stephull  form in different location on longitudinal flat bottom (stepedhull planning craft) to determine the influences of sticking and porpoising motion performances. These motions are usually occured when the craft start to take-off from water surfaces. The test models with scale of 1 : 7 were comprised of 4 (four) stephull models and 1 (one) non-stephull model  as a comparative study. The hydrodynamic  tests were performed with craft speed of 16 – 32 knots (prototype values) in Towing Tank at UPT. Balai Pengkajian dan Penelitian Hidrodinamika (BPPH), BPPT, Surabaya. The resistance (drag) was measured by dynamo meter and the trim of model (draft changing at fore and aft  of model due to model speed) was measured by trim meter. By knowing the value of model trim, the wetted surface area can be determined. Then, the lift forces were calculated based on these measured values. The model test results were presented on tables and curves.  Test results show that models  with step located far away from center of gravity of the WiSE craft tend to porpoising and sticking condition, except if the step location on the below of these center of gravity. While model without step tends to sticking conditions.

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