International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 10 | Oct 2024
p-ISSN: 2395-0072
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Study The stability of a high-speed boat according to the recommendations of Maritime Classification Societies Eng. Ali Adnan Ajamiah1, Dr. Heitham Issa2 1Marine Engineer and Master Student, Department of Maritime Engineering, Faculty of Mechanical and
Electrical Engineering, Tishreen University, Latakia, Syria.
2Associate Professor, Maritime Engineering Department, Faculty of Mechanical and Electrical Engineering,
Tishreen University, Latakia, Syria. ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract - The research reviews the designs of high speed designed and placed in a test basin, and the results were
collected within the research. A set of equations were extracted that give the initial prediction of resistance values and the relationship between the streamlined shape of the hull and achieving the highest possible speed in order to improve the actual operation of the ship under different sailing conditions [2]. The various investment conditions for high-speed boats were also discussed according to a studied model that achieves the required speed and economic efficiency, in addition to determining the appropriate size of the submerged part and presenting methods for improving flow. The author found that the Planning hull pressures increase in the front part of the hull, but decrease and become negative in the aft. He found that the thickness of the boundary layer increases in the direction of flow and decreases with increasing model speeds. He found that the measured speeds outside the boundary layer were greater than the free flow in the aft part of the hull, indicating acceleration from the front position. The research emphasized the importance of adding side fins to improve stability according to the results of the flow analysis around the studied hull [3]. Some research has dealt with developments in models of civil and military high-speed boat structures, where calculating speed and energy is a major topic for designing a model that achieves compatibility between structure and power. The research programmed both the Savitsky equations, which are the most widely used method, and the CAHI equations used in military models to predict resistance values. The study includes a set of variables related to the main dimensions, the movement of the boat, and the influence factors. The aim of this study is to present the CAHI method to the community of high-speed boat designers [4]. The relationship between the deadrise angle and the resulting resistance was studied, in addition to creating a database for the studied model structures. The initial results indicated that the design with a large deadrise angle showed less resistance compared to the reference boat design, as the hull resistance decreased by 16.87% at a deadrise angle of 30 degrees compared to the largest resistance at any other elevation angle [5]. The Syrian Arab Republic lacks this type of boats, except for some small fishing and pleasure boats. Therefore, it is necessary to determine the appropriate model for work in
boats hulls and the features and characteristics of each one, leading to the selection and design of a suitable model using the Maxsurf program with dimensions suitable for the marine market and with a monohull type (Planning Hull), due to its good speed and maneuvering characteristics, lower resistance values, and less disturbance on the water surface. After that, a preliminary drawing of the general arrangement plan and the tank distribution plan was made, and stability calculations were conducted on the boat designed according to the recommendations of the Maritime Classification Society, to deduce the behavior of the hull and the resulting stability values under different loading cases. Key Words: high-speed boat, boat stability, general arrangement, monohull, planning hull.
1.INTRODUCTION With the rapid development in ship design and construction, high-speed boats occupy an important place in development laboratories so that the studied structures achieve the required speeds with lower capacities by reducing the values of the resistances affecting the boat due to the better streamlined shape that is compatible with international classification rules, as modern models seek to achieve high quality and reliability. For this reason, many studies have addressed the topics related to fast boats and the difficulties facing designers in this field. Some of them discussed the initial hydrodynamic characteristics of slender structures and gave the schematic equations and experimental methods that show the values of the wetted surface areas, pressure centers, the angle of the ship's entry, and the longitudinal tilt resulting from the increase in speed, in addition to setting the predictive equations that achieve the horsepower requirements and appropriate operating values in accordance with the studied structure with a set of illustrative examples and digital diagrams [1]. Some of them also presented the problems facing designers in producing slender marine structures under the lowest values of effective resistance due to the complexity in determining the nature of fluid flow and its effect on the structure and the role of wet and free surfaces and the mutual influence between them, and did not Predicting resistance values was a simple matter, as a model was
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