scholarly journals Mathematical model for determining the roll angle of a fishing vessel when purse seine sampling

2021 ◽  
pp. 153-157
Author(s):  
Н.Л. Великанов ◽  
О.В. Шарков
Keyword(s):  
Traction Force ◽  
Sufficient Accuracy ◽  
Roll Angle ◽  
Fishing Gear ◽  
Fishing Vessel ◽  
Calculation Algorithm ◽  
Fishing Vessels ◽  
Trawl Fishing ◽  
The World ◽  
The Stability

Лов рыбы с применением кошельковых неводов является наиболее распространенным в мире после тралового лова. Процессы кошелькования невода, выборки улова могут существенно влиять на остойчивость рыболовного судна (сейнера). В данной работе рассматривается влияние на угол крена силы, действующие со стороны орудия лова. Приведен алгоритм расчета, учитывающий координаты точки приложения силы натяжения троса, идущего к орудию лова, углы наклона троса, величину силы. Составлены расчетные зависимости для процессов крена, получены выражения для угла наклона корпуса судна. Приведены примеры расчетов. В частности, рассмотрено изменение угла крена от тягового усилия, высоты подъема канифас-блока для промыслового судна. Проведенные расчеты свидетельствуют о достаточной для инженерных расчетов точности и возможности использовать приведенный алгоритм при оценочных расчетах на различных стадиях проектирования. Важно учитывать возможность одновременного наложения ветровых нагрузок, действия волн на корпус судна. В этих случаях крен и дифферент будут возрастать. Поэтому спецификой промысловых судов является необходимость учета поведения судна при проведении промысловых операций. Fishing with the use of purse seines is the most common in the world after trawl fishing. The processes of pursing and seine sampling can significantly affect the stability of a fishing vessel (seiner). In this paper, the influence of forces acting from the fishing gear on the roll angle is considered. The calculation algorithm is given, taking into account the coordinates of the point of application of the tension force of the cable going to the fishing gear, the angles of inclination of the cable, the magnitude of the force. Calculated dependences for roll processes are compiled, expressions for the angle of inclination of the vessel's hull are obtained. Examples of calculations are given. In particular, the change in the roll angle from the traction force, the lifting height of the snatch–block for a fishing vessel is considered. The calculations carried out indicate sufficient accuracy for engineering calculations and the possibility of using the above algorithm for evaluation calculations at various stages of design. It is important to take into account the possibility of simultaneous imposition of wind loads, the action of waves on the hull of the vessel. In these cases, the roll and trim will increase. Therefore, the specifics of fishing vessels is the need to take into account the behavior of the vessel during fishing operations.

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.

scholarly journals THE Windy Bay Discharge – A Success Story

2003 ◽  
Vol 2003 (1) ◽  
pp. 1097-1102
Author(s):  
Sharon O. Marchant ◽  
Leslie Pearson ◽  
John Hurst
Keyword(s):  
Diesel Fuel ◽  
Mechanical Response ◽  
Fishing Vessel ◽  
Success Story ◽  
Loss Of Life ◽  
The Public ◽  
Success Stories ◽  
Fishing Vessels ◽  
Recovery System ◽  
The World

ABSTRACT In the world of mechanical spill response, success stories are limited. The case of the F/V Windy Bay is an exception and much has been learned from the experience. On August 4, 2001, the fishing vessel Windy Bay hit a charted rock near Olsen Island in Prince William Sound, Alaska. The vessel carried 35,000 gallons of diesel fuel and sank quickly with no loss of life. A response was initiated, led by the USCG, with input from the owner, their response contractor, Chadux, and the contractor for the USCG, Alyeska/SERVS. The response lasted 20 days and involved 192 personnel, 20 spill response trained fishing vessels, the Valdez Star, and the CurrentBuster™ nearshore recovery system. By day six, over 12,000 gallons had been recovered and 19,500 gallons had evaporated or naturally dispersed. The mechanical response was very successful. The response also included major programs for protecting sensitive resources, informing the public and stakeholders, issue management, wildlife response programs and evaluations, decontamination, and waste management programs.

scholarly journals Fishing trawl modernization methods under ship thrust deficiency during voyage

2021 ◽  
Vol 2021 (3) ◽  
pp. 52-59
Author(s):  
Tat'yana Ryazanova
Keyword(s):  
Traction Force ◽  
Technical Condition ◽  
Full Scale ◽  
Propulsion System ◽  
Hydrodynamic Resistance ◽  
Fishing Vessel ◽  
Numerical Examples ◽  
Linear Dimensions ◽  
Trawl Fishing ◽  
Main Engine

The article considers the problems of compatibility between the hydrodynamic resistance of the trawl and the actual trawler's thrust, which have lost the ability to provide the necessary traction force due to the increase in the resistance of the ship's hull and wear of the engine-propulsion system. The area of resistance of the trawl system is proposed to be reduced by reducing the linear dimensions of the layers of the trawl part, as well as by replacing some layers of the trawl with a smaller mesh by those with larger meshes. It is noted that during fishing vessel masters often make an intuitive decision to replace trawls with those of less powerful vessels. Methods of reducing the area of trawl resistance are considered, which will lead to a decrease in its hydrodynamic resistance of the trawl fishing system. Numerical examples of the considered technique are given. The trawl plate P-K-120/1120, full-scale and modernized parts of the trawl are illustrated. The results of the trawl part modernization are presented, and the formula for calculating the fictitious trawl area is presented. The method of modernization of the trawl due to the increase in the size of the trawl in some parts of the trawl is analyzed, the average weighted step of the mesh in the full-scale trawl is calculated. The developed methodology should allow solving the problem of trawl modernization promptly, in the conditions of the fishing deck, by the forces of the ship’s crew. The proposed methods for the modernization of a fishing trawl will allow avoiding large costs for the repair of the main engine of a fishing vessel operating a trawl that does not correspond to the technical condition of the trawler, or to reduce the underfishing with a smaller trawl.

scholarly journals Fishing Vessel Characteristics with Multipurpose Gear to Support Fishing Operations in the Northern Sea of Java, Indonesia (Case Study in Indramayu)

2020 ◽  
pp. 1-8
Author(s):  
Izza M. Apriliani ◽  
Lantun P. Dewanti ◽  
Alexander M. A. Khan ◽  
Heti Herawati ◽  
Achmad Rizal ◽  
...  
Keyword(s):  
Survey Methods ◽  
Fishing Gear ◽  
Fishing Vessels ◽  
Trawl Fishing ◽  
Calculation Results ◽  
Motion Characteristics ◽  
Vessel Motion ◽  
Ability To Drive ◽  
Dimension Ratio

This study aims to analyze the ratio of the main dimensions of the vessel to see the performance of vessels with multipurpose gear. The research was conducted in February-March 2018 at the Karangsong Fish Landing Base (Ind: PPI), Indramayu. The object of research is the vessel used for fishing operations with multipurpose gear. The research method uses survey methods through the measurement of the main dimensions of fishing vessels, interviews and literature studies. The data obtained were then analyzed by comparative descriptive to compare the value of the ratio of the main dimensions of the vessel between Length and Breadth (L/B), the ratio between Length and Depth (L/D) and the ratio between Breadth and Depth (B/D). The calculation results of the ratio of the main dimensions of the vessel are then compared with the standard ratio values in Indonesia. Fishing vessels with multipurpose gear in Indramayu have good vessel motion characteristics but have an impact on slow speed, strong elongation strength of the vessel, and stability and ability to drive a good vessel. The dimension ratio of multipurpose gear vessels generally meets the criteria of the ratio of the main dimensions of vessels based on the method of operation in Indonesia. It should be noted that the L / B ratio tends to exceed the minimum standard criteria for the Indonesian dimension ratio, this results in slow speeds and will interfere with the setting and hauling fishing gear on seine boat and mini trawl fishing gear.

scholarly journals Analysis of Stability, Resistance, and Seakeeping Accord to Dimension and Form of Fishing Vessel 10, 20, 30 GT

INSIST ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 199
Author(s):  
Rizky Irvana ◽  
Arif Fadillah ◽  
Shanty Manullang ◽  
Fridolini Fridolini
Keyword(s):  
Resistance Ratio ◽  
International Maritime Organization ◽  
Stability Criteria ◽  
Fishing Vessel ◽  
Fishing Vessels ◽  
Analysis Of Stability ◽  
The Stability ◽  
Vessel Motion ◽  
Better Than

Fishing vessels used to catch resources from the sea has to pass some of the regulations from International Maritime Organization for sea-worthiness of the vessel especially about stability, resistance to acquire the highest velocity, and the vessel’s motion. This research discusses the effect of the vessel’s dimension and the hull shape by using the stability standard from IMO.The result shows that the ratio of the B/T which meets the stability criteria is 2.50 with the ratio of KG/H of the vessel is 0.65, with the assumption that the KG and H of the vessel are more than 0.70. Whereas if the resistance ratio B/T is big, the resistance for the vessel will be relatively smaller. In terms of the vessel motion, a vessel with a V-type hull will better than a U-type hull in seakeeping.

Unveiling the Theoretical Mistakes in the World Bank Formation and its Implication on Survival of Africa Monetary Union

2019 ◽  
Vol 10 (1) ◽  
pp. 119-124
Author(s):  
Olatunji Abdul Shobande ◽  
Kingsley Chinonso Mark
Keyword(s):  
World Bank ◽  
Monetary Union ◽  
Political Interest ◽  
World Bank Group ◽  
Policy Makers ◽  
The World Bank ◽  
The World ◽  
Bank Group ◽  
The Stability ◽  
Developed Nations

Abstract The quest for urgent solution to resolve the world liquidity problem has continued to generate enthusiastic debates among political economists, policy makers and the academia. The argument has focused on whether the World Bank Group was established to enhance the stability of international financial system or meant to enrich the developed nations. This study argues that the existing political interest of the World Bank Group in Africa may serve as lesson learned to other ambitious African Monetary Union.

scholarly journals Fisheries: A Missing Link in Greenhouse Gas Emission Policies in South Korea

2021 ◽  
Vol 13 (11) ◽  
pp. 5858
Author(s):  
Kyumin Kim ◽  
Do-Hoon Kim ◽  
Yeonghye Kim
Keyword(s):  
Greenhouse Gas ◽  
Greenhouse Gas Emission ◽  
Ghg Emissions ◽  
Bioeconomic Model ◽  
Negative Externalities ◽  
Fishing Vessel ◽  
Gas Emission ◽  
Fishing Vessels ◽  
The Government ◽  
Different Levels

Recent studies demonstrate that fisheries are massive contributors to global greenhouse gas (GHG) emissions. The average Korean fishing vessel is old, fuel-inefficient, and creates a large volume of emissions. Yet, there is little research on how to address the GHG emissions in Korean fisheries. This study estimated the change in GHG emissions and emission costs at different levels of fishing operations using a steady-state bioeconomic model based on the case of the Anchovy Tow Net Fishery (ATNF) and the Large Purse Seine Fishery (LPSF). We conclude that reducing the fishing efforts of the ATNF and LPSF by 37% and 8% respectively would not only eliminate negative externalities on the anchovy and mackerel stock respectively, but also mitigate emissions and emission costs in the fishing industry. To limit emissions, we propose that the Korean government reduce fishing efforts through a vessel-buyback program and set an annual catch limit. Alternatively, the government should provide loans for modernizing old fishing vessels or a subsidy for installing emission abatement equipment to reduce the excessive emissions from Korean fisheries.

Four Conceptions of Authority in International Relations

2021 ◽  
pp. 1-25
Author(s):  
Jorg Kustermans ◽  
Rikkert Horemans
Keyword(s):  
International Relations ◽  
Emotional Experience ◽  
Political Actors ◽  
International Authority ◽  
The World ◽  
Authority Relations ◽  
The Stability

Abstract There is increasing agreement that states and other political actors on the world stage sometimes achieve international authority. However, there is less agreement about the nature and functioning of international authority relations. What determines whether an actor will be recognized as an authoritative actor? And what are the effects thereof? In this essay, we identify four distinct conceptions of authority in the study of international relations: authority as contract, authority as domination, authority as impression, and authority as consecration. Consideration of the typology leads to two important insights. First, the phenomenon of authority has an essentially experiential dimension. Subordinate actors’ emotional experience of authority determines their response to authority and thus also has a fundamental impact on the stability of authority. Second, the emergence of forms of international authority does not entail, at least not necessarily, the weakening of the sovereignty of states, but can equally be argued to strengthen it.

scholarly journals Effects of Maximal Sodium and Potassium Conductance on the Stability of Hodgkin-Huxley Model

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Yue Zhang ◽  
Kuanquan Wang ◽  
Yongfeng Yuan ◽  
Dong Sui ◽  
Henggui Zhang
Keyword(s):  
Experimental Data ◽  
Mathematical Method ◽  
Bifurcation Point ◽  
Potassium Conductance ◽  
Maximal Conductance ◽  
Computing Model ◽  
The World ◽  
Stability And Bifurcations ◽  
The Stability ◽  
Sodium And Potassium

Hodgkin-Huxley (HH) equation is the first cell computing model in the world and pioneered the use of model to study electrophysiological problems. The model consists of four differential equations which are based on the experimental data of ion channels. Maximal conductance is an important characteristic of different channels. In this study, mathematical method is used to investigate the importance of maximal sodium conductanceg-Naand maximal potassium conductanceg-K. Applying stability theory, and takingg-Naandg-Kas variables, we analyze the stability and bifurcations of the model. Bifurcations are found when the variables change, and bifurcation points and boundary are also calculated. There is only one bifurcation point wheng-Nais the variable, while there are two points wheng-Kis variable. The (g-Na,  g-K) plane is partitioned into two regions and the upper bifurcation boundary is similar to a line when bothg-Naandg-Kare variables. Numerical simulations illustrate the validity of the analysis. The results obtained could be helpful in studying relevant diseases caused by maximal conductance anomaly.

Numerical and Experimental Approaches to Investigate the Stability of a Motorcycle Vehicle

2006 ◽  
Author(s):  
Federico Cheli ◽  
Marco Bocciolone ◽  
Marco Pezzola ◽  
Elisabetta Leo
Keyword(s):  
Degrees Of Freedom ◽  
Structural Parameters ◽  
Experimental Tests ◽  
Roll Angle ◽  
Longitudinal Motion ◽  
Reference Trajectory ◽  
Steering Angle ◽  
Steady State Condition ◽  
The Stability ◽  
Linearized Model

The study of motorcycle’s stability is an important task for the passenger’s safety. The range of frequencies involved for the handling stability is lower than 10 Hz. A numerical model was developed to access the stability of a motorcycle vehicle in this frequency range. The stability is analysed using a linearized model around the straight steady state condition. In this condition, the vehicle’s vertical and longitudinal motion are decoupled, hence the model has only four degrees of freedom (steering angle, yaw angle, roll angle and lateral translation), while longitudinal motion is imposed. The stability was studied increasing the longitudinal speed. The input of the model can be either a driver input manoeuvre (roll angle) or a transversal component of road input able to excite the vibration modes. The driver is introduced in the model as a steering torque that allows the vehicle to follow a reference trajectory. To validate the model, experimental tests were done. To excite the vehicle modes, the driver input was not taken into account considering both the danger for the driver and the repeatability of the manoeuvre. Two different vehicle configurations were tested: vehicle 1 is a motorcycle [7] and vehicle 2 is a scooter. Through the use of the validated model, a sensitivity analysis was done changing structural (for example normal trail, steering angle, mass) and non structural parameters (for example longitudinal speed).

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