Currently, Maritime safety is the best issue in the world. International Maritime organization (IMO) have recommended FSA methodology to enhance maritime safety. In this paper, the research conducted in the Malacca Strait. Malacca Strait is an area that has a high risk for shipping navigation. Many accidents occur in the area are like collision, fire, grounding and so on. Therefore a study on improving safety in this area is very important. it is to produce an output that can be used to provide input to the master and multiple stakeholders to improve safety on board at the time of sailing. In this study, AIS is used as a data source. Sea condition data collected actual traffic through the Automatic Identification System (AIS) equipment installed at Kobe University, Japan, and Universiti Teknologi Malaysia (UTM) in Johor, Malaysia. The data is applied to define a method with the help of Geographic Information Systems (GIS).
along with technological development and the increase in human population, the electricity needs are increasing every year. However, 94% of a power plant in Indonesia still using fossil fuels that are a pollutant and non-renewable. In addition, NASA said that the earth's temperature had risen by 1°C since 1880 and the current carbon dioxide level was the highest in the last 650,000 years. Therefore, Indonesia needs to improve, in fact, Indonesia is one of the highest emission contributors in the world. Indonesia is not yet 100% electrified, there are still 2,519 villages without electricity. Gravitational Water Vortex Power Plant (GWVPP) is a micro hydro-power plant may answer the problem because it is easy renewable energy to be made and utilized in the NIZ (not interconnected zones) region. This study will examine the changes in the number and shape of the blade, as well as the length of the chord, to know the effect on turbine power so that it can produce higher efficiency at GWVPP. Propeller turbine with a Gottingen 428 airfoil analyzed using Computational Fluid Dynamics (CFD) method. The results show that the number of blades and the length of the chord is inversely proportional to the efficiency of the turbine, and the shape of the blade is more efficient when it's twisted.
Abstract portable dynamic positioning system has not commonly applied to the vessel, especially on barge. Besides for dynamic positioning function, the system can be used as vessel's main propulsion. By using this system, the vessel able to not using anchors because the functions can be performed by the Portable Dynamic System. This research designed the vessels with main dimensions LWL 90.1 meters, 25 meters wide, 5.5 meters high and 4.2 meters draft. To generate the vessel with a maximum speed of 8 knots, it takes four thruster supplied with power 225 kW each, so that the total generated power is 1100 kW. This study analyzes three conditions of the vessel stability, there are the condition of full payload, empty payload, and maximum payload. The first is full payload conditions resulting payload in the amount of 5650 ton with a draft on the LCF at 4,181 meters. The second is the large empty payload condition displacement is 2809 ton and water draft on the LCF at 1,591. And the last is maximum payload conditions, resulting payload in the amount of 7450 ton with a draft on the LCF at 4,994 meters.Keywords flat top barge 300feet, portable dynamic positioning system, thruster, ship stability
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