Stability of Fishing Vessels in Waves and Wind (original) (raw)
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Intact stability of fishing vessels under combined action of fishing gear, beam waves and wind
Ocean Engineering, 2011
The intact stability of three Portuguese and four Peruvian fishing vessels operating in the Atlantic and Pacific Oceans under the action of fishing gear pull, beam waves and wind are studied. The reduction of dynamic transverse stability of these fishing vessels have been studied, as a result of roll back angle, wind moment (based on 2008 IS Code, part B) and fishing gear pull moments and their combination, including their combined effects. The calculation results presented in this paper show that: (a) fishing gear heeling moments, in many occasions, are more critical than the heeling moments produced by rough weather scenarios and, effectively, a combination of them may lead to total stability failure even when a normal fishing trip is considered; (b) some fishing vessels have over dimensioned fishing gears and machinery onboard, that have negative influence onto fishing vessel's transverse stability. Finally, comments are made about the limitations of ''2008 IS Code, part B'' with respect to prevention of stability failure due to combined effect of fishing gear pull, beam waves and wind.
Fishing vessel stability assessment system
Ocean Engineering, 2012
Fishing is at the front of the maritime sector in accidents and ship losses, which are usually caused by stability loss and its associated problems. The crews of the vessels do not usually know how to deal with these situations and are unable to properly evaluate the risks their ships are undertaking. This is the problem we have tried to address, that is, how to create a system that can act as an assistant to crews of fishing vessels and provide information on their level of stability any given moment, in a very easy, clear and understandable way, independently from the training level of the user. Such a system is presented in this work: it is able to deal with the main causes of ship instability for the majority of ship loading conditions, presenting the stability information in a very understandable manner. Finally, the ease of operation of the system is demonstrated through an analysis of its usability, the results of which are also presented here.
Variations on Transverse Stability of Fishing Vessels due to Fishing Gear Pull and Waves
A critical review of IMO transverse intact stability criteria (IMO IS Code 2008) for fishing vessels is presented. The reduction of dynamic transverse stability of fishing vessels due to the fishing gear pull moment has been investigated and hazards associated with the pure loss of transverse stability in longitudinal waves has been also pointed out. In this study, first a set of fishing vessels from the Portuguese and Peruvian fleets has been considered to evaluate the intact stability in longitudinal waves. Secondly, the transverse stability results of fishing vessels operating in the Pacific and Atlantic Oceans have been compared with the IMO IS Code 2008 and other applicable rules. Hence, conclusions were drawn and comments were made about IMO present aims with respect to prevention of capsizing due to fishing gear pull and importance of weather criterion in beam waves. Finally, some recommendations on utilization of different kind of fishing gears are presented taking into acco...
Seakeeping performance of fishing vessels in irregular waves
Ocean Engineering, 2011
A study of the seakeeping performance of a set of fishing vessels is carried out aiming to identify the seakeeping criteria, and vessel conditions that limit the operability of the fishing vessels in certain sea states. Ship motions and derived responses are obtained in fully developed sea states using the transfer functions of the hull forms. Those responses are assessed against the prescribed values, for the chosen criteria, to determine the vessels operational conditions that might result in hazards or seasickness. For the purpose of this study, each fishing vessel is considered operating in sea states 5 and 6, with different Froude numbers and heading angles, and their short term responses are assessed against the most relevant criteria related with the absolute and relative motions, accelerations, slamming and green water on deck. The results obtained show that roll and pitch criteria are most critical for seakeeping performance, and there is a significant influence of the transverse metacentric height, GMt, and the location of the reference checking points in the seakeeping performance of these fishing vessels.
Stability of small fishing vessels in longitudinal waves
Ocean Engineering, 1999
The dynamic stability of fishing vessels in longitudinal regular waves is investigated, both analytically and experimentally. In particular, the influence of stern shape on the parametric stability of fishing vessels is studied. Vessels TS and RS have very similar main characteristics, but their sterns are different. Although their linear responses are comparable, both analytical and experimental investigations indicate substantial differences in their dynamic stability in longitudinal regular waves. Strong resonances are found for the vessel with the deep transom. The analytical method takes into consideration the effects of the heave and pitch motions and wave passage and shows good agreement with experimental results. Stability limits are obtained for different conditions and are used as an aid in the discussion of the results obtained in the tests when relevant parameters are changed, such as wave amplitude and frequency, metacentric height and roll damping moment.
A stability monitoring and advisory system for small ships
1994
Considering the loss of lives and money as a result of marine accidents, the importance of reducing or preventing capsizing of small boats is clearly evident. The research described in this thesis addresses the development of a monitoring and advisory system for the safety of fishing vessels. This system uses environmental information obtained from a number of sensors and proposes corrective action based on a rule-base derived from experiments, theoretical research and human expertise. Improvements in computer technology and the low prices of measurement equipment facilitates the integration of a system based on off-the-shelf devices and subsystems such as a ship's radar system to measure wave properties.The thesis demonstrates that such off-the-shelf devices and subsystems can be used with special purpose software developed to produce a low cost, intelligent safety monitoring and advisory system. This monitoring system is designed based on the following requirements : • The sys...
Seakeeping and Safety Assessment of Fishing Vessel 30 GT
International Journal of Marine Engineering Innovation and Research
⎯ in Indonesia, many fishing vessels are made from generation to generation in a traditional way. As a result, the ships built did not comply with the regulations and permits of the naval architects. The fishing industry is one of the most dangerous because it works on the high seas. Therefore the performance in hydrodynamics and safety should be evaluated on these traditional vessels. The main objective of this research is to evaluate the hydrodynamic performance and safety of fishing vessels. Following standard specifications or criteria, seakeeping performance is evaluated using Maxsurf Ship Design software. Assessment of existing safety equipment uses IMO (International Maritime Organization) regulations and the Torremolinos protocol. As a result, the ship can only operate at a wave height of 0,1-0,5 meters or undersea state 3. Ship safety inspections reveal that they still do not meet the required requirements and do not have the necessary equipment specified by the World Maritime Organization (IMO).
2015
The paper presents the importance of a ship’s intact stability. It is evident the factors that contribute to the correlation between a ship’s stability with the safety of a ship and the safety of navigation. Ship stability failure is presented as a threat to the safety of navigation. This aspect is presented in the form of casualties involved in the loss of ship stability in severe sea conditions. This is in order to emphasize the causes that lead to ship stability loss. A study of various ship stability casualties in heavy weather conditions is presented and the causes are analysed. The actual intact ship stability criteria are analysed and the importance of a new generation of stability criteria for preventing ship stability loss in severe sea conditions is highlighted.
Motion Response Characteristics of Small Fishing Vessels of Different Sizes among Regular Waves
Journal of Ocean Engineering and Technology
The motion of small fishing vessels is significantly affected by small waves, leading to accidents, such as capsizing or sinking. This paper presents the results of two types of basin tests. The first test analyzed the characteristics of roll and pitch motions among regular waves with the same wave steepness using the drifting state of three (3G/T, 7G/T, 10G/T) small fishing vessels. The second test analyzed the motion characteristics of the 7G/T fishing vessel under different wave steepness. The first test showed that heave and roll motions are significant in the beam sea, while pitch motion is significant in the bow and stern seas. The second test shows that wave steepness has a linear relationship with roll and pitch motions in the bow and stern seas.
Stability Criteria for Sailing Vessels
Mdy 08 Madrid Diseno De Yates 2006 Iii Simposio Internacional De Diseno Y Produccion De Yates De Motor Y Vela Mdy 2008 26 06 2008 27 06 2008 Madrid Espana, 2008
What do you know about sailing yacht stability? Which are the peculiarities of the stability of a sailing yacht? Is there any supposition different from those applied in conventional ships? If you have to verify the stability of your yacht, would you be sure of which criteria you should applied? The aim of this paper is to answer these questions among others. The authors assume that the readers of this paper come from varied backgrounds and experience. Some of you may not be totally familiar with these stability requirements whereas others may use them every day. It is hoped that this paper will be some enlightenment for the former and be an interesting review for the latter. In this paper the philosophy of sailing yacht stability will be presented. It will be also examined the criteria in force in countries such as Spain, United Kingdom, United States and The Netherlands among others and the assumptions upon which they are based will be highlighted. In order to clarify ideas two reference sailing yacht will be subjected to different criteria and compared their severity.