INDONESIAN HYDRODYNAMIC LABORATORY

Diposting oleh achmad bisri on Senin, 10 Agustus 2009

Indonesian Hydrodynamic Laboratory (IHL) is a research laboratory of BPPT (The Agency for the Assessment and the Application of Technology), with sophisticated facilities including specialized test water tanks and cavitation tunnel, for testing many types of ships, offshore structures and civil-ocean buildings. The laboratory is devoted to research and development of propulsive, sea-keeping, maneuvering performance of ships and offshore structures of all types and sizes. This center of knowledge is also being important for the development of the Indonesian maritime industry with taking its best advantage of science and technology opportunities. The function of this laboratory is not only to study and develop the hydrodynamic performance of new design products but also to improve that of existing products to meet current demands thereby contributing forward the continued progress and development of technology, know-how and also contributing to increase the knowledge of the man power involved in marine industry.

The laboratory works on the following areas of study: Propulsive performance of a ship is a major factor in achieving energy saving in ship operation. To improve propulsive performance, it is essential to accurately assess the required power in the early stage of ship design. Based on the data obtained from tank tests and other theoretical studies, an accurate power prediction system is available at the laboratory incorporating the following tank tests and theoretical as well as statistical calculations.
Studies in water tank: resistance and self propulsion test, wave pattern analysis, propeller open water test, and flow visualization test. Ship Powering Prediction Assessment on Propeller Cavitation As the propeller functions in an irregular flow field behind the hull, vibrations and noise caused by the propeller not only affect the propeller performance but also constitute an important factor for ship performance. Facilities for making detailed theoretical studies, necessary for designing high-performance propellers are available here. Such studies include: propeller open water characteristics, cavitation characteristics, propeller exciting vibratory force and moment, and hull surface pressure variations

Offshore Structure Designing System In designing offshore structures, it is necessary to take into consideration the various forces caused by climatic and sea conditions acting on the offshore structures. The Offshore Structure Designing System includes calculations of the various hydrodynamic forces acting on such widely ranging shapes such as semi-submersible vessels, tension-leg platforms, jack-up rig, etc. as well as analysis of their structures and motion characteristics. The laboratory also provides data on the following: hydrostatic characteristics, motion responses, inertia forces, wave loads, and statistical prediction of responses. In addition, the system also provides data regarding the operational conditions, various stages of construction and at the time of installation of offshore structures. Besides, simulation of the motion and mooring forces of various moored structures under natural environment conditions can be carried out. Sea-keeping Quality of Ship As ships have to be operated under various climatic and sea conditions, a ship's sea-keeping quality constitutes an important factor from the standpoints of safety and economy. Prior to model test, the sea-keeping quality calculation provides various data related to a ship's seaworthiness, based on the strip theory method then followed by model test in the water tanks. The study includes: ship motion; fluctuating pressure on hull surface; shearing force, bending moment and torsion moments; deck wetness and propeller emergence; relative motion between wave and hull; slamming; acceleration; and resistance increase.

Numerical Computation
In general, result of analysis from experiments can be completed for clients within 8 - 12 working weeks (depending on complexity of the problem and hence modeling in the basin). However, at preliminary stage, clients usually need fast and accurate results for analysis of their design. For this purpose, a number of numerical calculations are available using proprietary software to perform following tasks: P Offshore Structure Analysis P Finite Element Analysis P Ship Motion Analysis P Time Domain Mooring Analysis P Offshore Hydrodynamic Analysis P Ship Powering Prediction P Ship Maneuverability Prediction P Propeller Design and Analysis P Marine Environmental Modeling and Analysis A series of in-house computational algorithms are also available for the purpose of floating bodies mooring analysis, which includes, determining of mooring lines specification, deck wetness and bow slamming incidence, green water load on deck, structural integrity of floating production unit, etc. Maneuvering Simulation A ship must be able to accurately respond to widely varying maneuvering pattern while at sea or in port, including avoiding other ships, berthing at piers, etc. Thus, when a ship is built, its maneuverability is thoroughly checked at the basic design phase. The following test services of ship maneuvering pattern are: turning circle, zigzag maneuver, spiral maneuver, and course changing maneuver
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