Abstract
The application of multi-hull ship or trimaran vessel as a mode of transports in both river and sea environments have grown rapidly in recent years. Trimaran vessels are currently of interest for many new high speed ship projects due to the high levels of hydrodynamic efficiency that can be achieved, compared to the mono-hull and catamaran hull forms. The purpose of this study is to identify the possible effects of using an unsymmetrical trimaran ship model with configuration (S/L) 0.1–0.3 and R/L=0.1–0.2. Unsymmetrical trimaran ship model with main dimensions: L=2000mm, B=200 mm and T=45 mm. Experimental methods (towing tank) were performed in the study using speed variations at Froude number 0.1–0.6. The ship model was pulled by an electric motor whose speed could be varied and adjusted. The ship model resistance was measured precisely by using a load cell transducer. The comparison of ship resistance for each configuration with mono-hull was shown on the graph as a function of the total resistance coefficient and Froude number. The test results found that the effective drag reduction could be achieved up to 17% at Fr=0.35 with configuration S/L=0.1.
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Foundation item: This research work has been supported by the Directorate for Research and Community Service, University of Indonesia (RUUI Utama 2012), Jakarta, Indonesia.
Yanuar received his B.S. degree in Naval Architecture from University of Indonesia, Indonesia, in 1986. He then received his Master of Eng. and Doctor of Eng. in Mechanical Engineering from University of Tokyo Metropolitan, Japan, in 1995 and 1998, respectively. Professor at Mechanical Engineering, University of Indonesia in Jakarta, Indonesia. His research project is about drag reduction in internal flow or external flow.
Gunawan received his B.S. degree in Naval Architecture from University of Indonesia, Indonesia, in 2010. He then received his Master of Eng. in Naval Architecture from University of Indonesia, Indonesia, in 2012. Now, He join as young lecturer in his University. His research project is about how to reduce frictional resistance in under water body.
M.A. Talahatu received his B.S. degree in Naval Architecture from Hasanuddin University, Indonesia, in 1982. He then received his Master of Eng. Mechanical Engineering from University of Indonesia, in 2003. Now, he is continuing Doctor program in Mechanical Engineering at University of Indonesia in Jakarta, Indonesia. His research project is about drag reduction in vessel with slime biopolymer.
Ragil T. Indrawati received her B.S. degree in Naval Architecture from University of Indonesia, Indonesia, in 2012. Now, she is continuing Master program in Mechanical Engineering at University of Indonesia in Jakarta, Indonesia. Her research project is about drag reduction in vessel with hull form modification.
A. Jamaluddin is senior research fellow at the Indonesian Hydrodynamics Laboratory (IHL) at Surabaya — Indonesia. He received his M.Sc. in Marine Technology from the University of Strathclyde, Glasgow, U.K. in 1991 and Ph.D in Naval Architecture from Institut Teknologi Sepuluh Nopember (ITS)at Surabaya — Indonesia in 2012. His research is about some technique to reduce frictional resistance onship model.
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Yanuar, Gunawan, Talahatu, M.A. et al. Resistance analysis of unsymmetrical trimaran model with outboard sidehulls configuration. J. Marine. Sci. Appl. 12, 293–297 (2013). https://doi.org/10.1007/s11804-013-1193-y
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DOI: https://doi.org/10.1007/s11804-013-1193-y