The towing hook on the tugboat has a function to pull the barge. Because of this ability, a good towing hook construction is needed to work optimally. Indications for the good construction is the value of fatigue life, which is more than the value of design life of 20 years. A towing hook detail on tugboat from PT. Asia Aditama Shipyard – Balikpapan was selected as an example. This study aims to obtain the value of fatigue life based on the total resistance calculated by BHP data in full, 75%, and 50% of the total displacement volume and estimate the maximum size of a barge, based on maximal towing pull capacity. The benefits of this research are providing information about the fatigue life of a towing hook, analyzing several possible load cases, and giving the recommendation of the maximum principal dimensions of the barge that the towing hook can be pulled. The method used in this study is the finite element method using ANSYS, the fatigue life calculation approach is the Palmgren–Miner cumulative damage method and refers to the DNVGL rule. The results of the calculation of fatigue life in the maximum towing pull condition are 22 years, 22 years, and 23 years at 100%, 75%, and 50%, respectively. The main size of barges that can be towed by Tugboats under maximum towing pull conditions are LOA = 147m, LWL = 144,529m, B = 35m, H = 13m, T = 11m.
Fire tests of fireproof and non-fireproof curtains were conducted to investigate the cooling performance of the proposed water film system. The experimental results showed that although commercial fireproof curtains without a water film system had good flame resistance, they had limited heat resistance. The maximum temperature on the unexposed surface of the tested commercial fireproof curtains without a water film system reached 693 °C, and the curtains failed in 30 min. In the cases of curtains with a water film system, the temperature of the unexposed surface was able to remain below 45 °C for the fireproof curtain and 55 °C for the non-fireproof curtain. The integrity of both curtains was conserved for the entire 60-min test duration. Using the proposed water film system, the heat resistance and fire integrity of curtains were greatly improved. ARTICLE HISTORY
AbstrakDi Indonesia, proses pengiriman batubara dengan kapal tongkang banyak dijumpai karena kemudahan aksesnya dimana kapal tongkang memiliki sarat air (draft) yang lebih kecil dibandingkan dengan jenis kapal lain. Penelitian ini mencoba menentukan hambatan pada kapal tanpa awak berbentuk kapal tongkang untuk beberapa kecepatan menggunakan metode CFD dengan program OpenFOAM. Metode ini mendiskritisasi persamaan Navier Stokes dengan menggunakan pendekatan metode volume hingga. Kapal tongkang digambar menggunakan perangkat lunak Maxsurf modeler sebelum diintegrasikan kedalam program CFD. Diskritisasi dilakukan dengan memastikan area sekitar lambung kapal terdiskritisasi cukup rapat. Hasil penelitian menunjukan bahwa Hambatan pada kapal tongkang berkisar antara 39.39kN-227.963kN untuk kecepatan 3-9knot. AbstractIn Indonesia, the process of coal shipping with barges is prevalent due to the fact that barges have smaller draft compared to other vessels; The research was aimed to determine the resistance of a barge as an autonomous vehicle utilizing CFD method in OpenFOAM program. The method discretize Navier Stokes equations using finite volume method. The barges was drawn by virtue of Maxsurf modeler before integrated into the CFD program. The discretization should ensure that the vicinity of the ship was discretization adequately. The result shows that barge resistance is ranging at 39.39 kN -227.963 kN at velocity 3-9 knots.
The Ferry Ro-Ro 5000GT has three levels of car deck that are connected by internal ramps. Two issues that have to be paid attention during the operation of the internal ramp there are the strength capacity and the design fatigue life of the internal ramp structure. The purpose of the research is to determine the strength and fatigue life of the internal ramp construction. The method used the Finite Element Method using a static load by load case of point load at top girder and between girders. Results of the research detected the maximum stress value is in the load case of the point load (three sedan car) at between of the girder is 52.143 MPa with the fatigue life is 44.47 years with the load cycle is 7300000 cycle while the minimum stress value detected at the load case of the point load (two sedan cars) at top girder is 34.199 MPa with the fatigue life is 195.92 years with the load cycle is 50000000 cycle. For the safety factor, ramp construction 6.08 ~ 10.38. The safety factor value above is still in safe condition because the value is SF > 1.
In designing a ship, it is necessary to know the response of the ship's motion before sailing. The purpose of this research is to determine the ship's motion response to waves as well as ship speed in ship loading operational conditions. The method used in this study is the B-spiline mathematical equation and the strip theory method, with the help of ship motion software, which varies the ship's load by 100% DWT, 50% DWT, and 25% DWT. While the highest significant amplitude heave value occurs on a ship with 100% DWT conditions with a speed of 18 knots and a wave direction of 90 0 , which is 2.70 meters, the highest significant value of amplitude pitch occurs on a ship with a condition of 25% DWT with a speed of 6 knots and a wave arrival direction of 180 0 , namely 1.10 degrees, and the highest significant value of roll amplitude occurs in ships with 25% DWT conditions with speeds of 18 knots with a wave arrival direction of 90 0 , which is 3.42 deg. The research results detected at a speed of 18 knots for the significant amplitude heave value, the significant amplitude pitch value, and the maximum RAO value still meet the Nordforsk criteria.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.