Coastal development, such as land reclamation or dredging, usually changes the characteristics of... more Coastal development, such as land reclamation or dredging, usually changes the characteristics of the coastal waterway. A common phenomena due to restricted waterway is increase in ship resistance and reduction in manoeuvrability. The restricted water inflow under the vessel, ...
Demand on High Speed Craft (HSC) is increasing due to development of inland transportation. There... more Demand on High Speed Craft (HSC) is increasing due to development of inland transportation. Therefore, many analysis have been conducted to evaluate performance of this modern ship. One of the important analysis is calm water resistance test. Resistance component of the hull and wave pattern around the hull are obtained from the calm water test. These criteria are important in analyzing flow around hull, especially on wave interference between the hulls. In this paper, flow around hull has been studied for one model of Semi SWATH hull form with fin stabilizers installation by performing calm water resistance test in deep water. The fore fin angle is fixed to zero degree while the aft fin angle is varied to 0, 5 and 15 degree. The effects of fin angle to resistance criteria and flow around hull are investigated. Wave height has been recorded using longitudinal wave probe during resistance test. For each configuration, the investigation is conducted with range of Length Froude Number ...
A Liquefied Natural Gas (LNG) tanker will encounter many hazards during its operations and some o... more A Liquefied Natural Gas (LNG) tanker will encounter many hazards during its operations and some of them will have high risk levels such as grounding and collision in regions of population concentrations in restricted water. The accident of LNG ships in grounding was reported in narrow channel due to manoeuvring difficulties derived from ship–bank interaction. This paper examines manoeuvring performance of a LNG tanker hull form, which was modified to be fitted by fins while taking into account the ship bank interaction effects. ...
Semi-SWATH ship has a different characteristics compared to the common ship hull. The ship has a ... more Semi-SWATH ship has a different characteristics compared to the common ship hull. The ship has a tendency to suffer bow-dive due to low restoring force at bow when running in following seas. In some conditions, the foredeck found to be immersed under the rear of wave. Acceleration motion to the trough increases the momentum force that pushing the ship to dive. The condition may cause the ship has a loss of control even the crew can feel thrown forward. In this research, fin stabilizer was applied to reduce the effect of those conditions with application of fuzzy logic controller. The controller calculates the angle for the fin stabilizer based on the pitch angle. The fin at both ends of the ship’s hull increase the lift force, reduce the trim angle, and restrain the ship from dynamic high acceleration. A numeric time-domain program developed to analyze the ship seakeeping in following sea. The results showed the controller of the fin stabilizer has a significant effect in preventing the ship from the unsafe condition.
Coastal development, such as land reclamation or dredging, usually changes the characteristics of... more Coastal development, such as land reclamation or dredging, usually changes the characteristics of the coastal waterway. A common phenomena due to restricted waterway is increase in ship resistance and reduction in manoeuvrability. The restricted water inflow under the vessel, ...
Demand on High Speed Craft (HSC) is increasing due to development of inland transportation. There... more Demand on High Speed Craft (HSC) is increasing due to development of inland transportation. Therefore, many analysis have been conducted to evaluate performance of this modern ship. One of the important analysis is calm water resistance test. Resistance component of the hull and wave pattern around the hull are obtained from the calm water test. These criteria are important in analyzing flow around hull, especially on wave interference between the hulls. In this paper, flow around hull has been studied for one model of Semi SWATH hull form with fin stabilizers installation by performing calm water resistance test in deep water. The fore fin angle is fixed to zero degree while the aft fin angle is varied to 0, 5 and 15 degree. The effects of fin angle to resistance criteria and flow around hull are investigated. Wave height has been recorded using longitudinal wave probe during resistance test. For each configuration, the investigation is conducted with range of Length Froude Number ...
A Liquefied Natural Gas (LNG) tanker will encounter many hazards during its operations and some o... more A Liquefied Natural Gas (LNG) tanker will encounter many hazards during its operations and some of them will have high risk levels such as grounding and collision in regions of population concentrations in restricted water. The accident of LNG ships in grounding was reported in narrow channel due to manoeuvring difficulties derived from ship–bank interaction. This paper examines manoeuvring performance of a LNG tanker hull form, which was modified to be fitted by fins while taking into account the ship bank interaction effects. ...
Semi-SWATH ship has a different characteristics compared to the common ship hull. The ship has a ... more Semi-SWATH ship has a different characteristics compared to the common ship hull. The ship has a tendency to suffer bow-dive due to low restoring force at bow when running in following seas. In some conditions, the foredeck found to be immersed under the rear of wave. Acceleration motion to the trough increases the momentum force that pushing the ship to dive. The condition may cause the ship has a loss of control even the crew can feel thrown forward. In this research, fin stabilizer was applied to reduce the effect of those conditions with application of fuzzy logic controller. The controller calculates the angle for the fin stabilizer based on the pitch angle. The fin at both ends of the ship’s hull increase the lift force, reduce the trim angle, and restrain the ship from dynamic high acceleration. A numeric time-domain program developed to analyze the ship seakeeping in following sea. The results showed the controller of the fin stabilizer has a significant effect in preventing the ship from the unsafe condition.
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