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The initial research on air flow's dynamic impact on a ship model of 888 project type

Mironiuk W.

Journal of KONES

2011

Vol. 18, No. 4

281-288

During operation, a ship is open to dynamic effects resulting from specifics of marine environment. Among these effects, wind dynamic impact together with a wavy motion is especially hazardous for the ship. These impacts generate heels to the big angle. The angle of dynamic heel can be determined according to IMO regulation but the real value is different. Determination of a real value of the dynamic angle of heel is possible by executing model tests performed with geometric and dynamic similarity scale taken into consideration. Results of initial research on air flow's dynamic impact on a ship model are presented in the elaboration. The research has been executed at a test stand located in the Polish Naval Academy. Main elements of the stand consist of model basin, ship model of 888 and 660 project type, computer registering parameters of the ship model position, device generating air flow. The ship model of888 project type has been an object of the tests. It was made in a scale 1:50 in respect to a real vessel. Results of executed measurements have been compared with theoretical calculations for an angle of dynamic heel. Input parameters for the tests and calculations have been defined in accordance with recommendations of Polish Register of Shipping (PRS) and IMO [1, 2, 5]. Determination of a heeling moment by wind operation has been a key issue. The executed research has revealed that the way the criteria of the ship's dynamic stability are defined by PRS and IMO takes a certain safety margin into account.

Comparative analysis of the flooding time main engine ship type 888 defined from calculations and model research

Mironiuk W.

Journal of KONES

2010

Vol. 17, No. 4

345-352

Research on damage stability and invincibility is a valuable source of knowledge of behaving a ship while flooding its compartments. In the paper, a short deser iption of accidents and damages of Polish warships taking place in 1985-2004 is presented. The time when compartments are flooded (tf) is one of the key elements which have influence on a rescue action. The knowledge of the time mentioned is very important for a commanding officer making decisions while flghting for invincibility and survival of the ship. To provide the information about the time tf of a ship type 888 a new method was designed. The method was tested experimentally and results of the tests are presented in the paper. In the experiments, the flooding process of compartments was simulated. The flooding time calculation of damaged compartment, according to the method des er ibed in the paper, is verifled on the laboratory stand bed. Thanks to a suitable construction and new concepts applied for the station, research on the ship reaction and position in the failure situations is possible. The next part of research was carried out on the laboratory stand bed, where the flooding time of damaged compartment of warship model was measured. The results of the experiments can be a base to define general rules to make proper decisions during the process of damage control.