Research Project

This research aims to investigate the maneuvering performance of a ship with small draught and large breadth during operation. The effect of wind and waves was analyzed to obtain the controllability and operational limitation of an Indonesian ro-ro ferry. An autopilot control system using PID control has been designed and verified with free running model experiment. The estimation fuel consumption corresponding to the operational condition has been conducted in a certain operational route of an Indonesian ro-ro ferry. This work is necessary to validate with the real operational condition by directly measure the fuel consumption of the ship. The results can be used to estimate the exhaust emission in relation to the energy efficiency design index (EEDI) or energy efficiency operation index (EEOI) as well as the contribution of the Indonesian ro-ro ferries on air pollution.

The stability criteria used to assess merchant ships stability is the International Stability Criteria of International Maritime Organization (IMO). That criteria are applied to convention ship with internationally operated. A different criteria may be used to unconventional ship and locally operated. Each country may developed their own local stability criteria even thought the criteria of IMO still may be used.

The objective of this research are to develop intact stability criteria applied to ships operating in Indonesia, namely the Indonesian ro-ro ferries and the Indonesian traditional wooden boats. The breadth-to-draught ratio of an Indonesian ro-ro ferry may be larger than 4.5. The Indonesian traditional wooden boats were built with not watertight main deck construction. Therefore the down flooding angle can be small than 30 degrees or the angle with maximum righting arm.

The accidents frequently occur on Indonesian ro-ro ferries are shifting or overthrowing of vehicles loaded in the main deck. The accidents could be induced by the large lateral acceleration during the ship operation in rough weather. The International Maritime Organization has been included the lateral acceleration as one of vulnerability mode in the Second Generation Intact Stability Criteria (SGISC) known as the excessive acceleration criteria. Most of Indonesian ro-ro ferries fulfill the requirements of a ship to be tested against the excessive acceleration criteria, namely the metacentric height (GM) and the location of passenger and crew accommodation.

The research aims to investigate the possibility of a truck shifting or overthrowing. The results can be used to determined the operational limitation of an Indonesian ro-ro ferry correspond to the lateral acceleration induce car shifting or overthrowing. The results by also be used to design lashing construction to avoid that accident.

The present research project conducted corresponds to ocean energy conversion is design of floating structure for wave energy conversion. The efficiency depends on the wave and floating body characteristics.  Numerical analysis was performed to estimate the heave motion of some different shape and geometry characteristics of floating structure. The body was designed to be multi function as wave energy conversion and as mooring buoy or navigation buoy in port area or ship route to enter the port. The main purpose is to find out the most efficient floating body to convert wave energy for a certain wave characteristics, namely the wave heigh and wave length. The results may also be used to determine the buoy dimension correspond to the wave characteristics of a certain area/location.

The research corresponds to the pitch motion of a SPAR to be used as a floating structure for ocean wind turbine. Vertical damping plate with various number and configuration has been investigate its impact on the damping moment of pitch motion by model experiment. Numerical simulation of pitch motion with variation of damping plate configuration has also been performed to analysis the effect on the pitch motion. The results show that the damping plate in a certain condition can significantly reduce the pitch motion of the SPAR.