Instability of a ship towing system indicated by vigorous yaw motion of a towed ship may reduce the safety of the navigation especially in the restricted with heavy congestion waterways. To stabilise this towing system, a comprehensive investigation on a towline configuration is therefore required. This paper presents Computational Fluid Dynamic (CFD) approach to analyse the unsteady yaw motion characteristic of a towed ship using symmetrical bridle towline. Several towing parameters such as various towing point locations on the symmetrical bridle towline and towing’s velocity have been taken into account. Here, a towed ship designates as 1B (barge) is employed in the simulations. The results revealed that the subsequent increase of towing point location on the symmetrical bridle towline will reduce significantly her unsteady yaw motions by 99.67%, improves barge course stability. In addition to increasing towing’s velocity, it gradually leads to have poor course stability as the yaw motion increased by 23.83% meanwhile slewing period decreased by 20% as velocity increased.
Programme of Maritime Technology, School of Ocean Engineering, Universiti Malaysia Terengganu, Malaysia
While all materials inside International standard ISO/IEC 17025 have an universal value as “generalities” for all laboratory, especially on Technical and Management aspect, other specific terms such as testing process, calibration process and method for estimating any error when scaling could use another method that came from various technical standard. International standard ISO/IEC 17025 is published in 1999 and revised on 2005. Those standards describe various debatable clauses when internal audit is in place, especially when it is used for audit process in Hydrodynamics Laboratory in terms for management quality. Based on various researches, finally it is decided that those standard needs to be revised again and perfected in terms for Quality Internal audit.
Laboratory for Hydrodynamics Technology, Surabaya - Indonesia
Department of Marine Engieering, Institut Teknologi Sepuluh Nopember, Indonesia
Ocean Thermal Energy Conversion (OTEC) is a clean marine renewable energy using temperature difference between the sea surface and the deep ocean to rotate a generator to produce electrical energy. As Malaysia is an equatorial country located at latitudes less than 20 degrees covered by ocean, many islands, strain and many difference of topography, OTEC is very compatible build in Malaysia. This paper discussed the potential areas of OTEC to be applied in Layang-Layang Island, Sabah in Malaysia. The paper found that Layang-Layang Island was high potential for application of OTEC. Using site measurement data, 4 MW electricity generated by OTEC was simulated as a case study.
Naval Architecture and Offshore Engineering, Universiti Teknologi Malaysia, Malaysia
Ocean and Aerospace Research Institute, Indonesia
Faculty of Engineering, Universitas Andalas, Indonesia
Faculty of Engineering, Universitas Riau, Indonesia
