The boundaries of broken ice distributionin the Sea of Okhotsk

– the safe speed of the vessel is correlated with the dynamic strength of ice compression and the ultimate strength ship’s hull bow structures, perceiving ice blows;

– the minimum thickness of solid ice, limited of the ship ice cross and mostly depends on its displacement, engine power and bow contours angles;

– the minimum thickness of broken ice of 10 points concentration, limiting the salability of the ship, and mostly depends on the capacity of the power plant, safe speed, resistance to the ship motion and on compression power of ice;

– the minimum thickness of ice, which can damage the middle part of ships hull in ice capture and ship compression, associated with the static strength of ice at buckling and ultimate strength side structures of the hull middle area

–

the comprehensive criterion of the ice-going properties

Explore options for fishing ships

1. With the growing of ships’ sizes the safe speed have no clear upward trend. The small boats can have greater bow strength and superior large ships of the safe speed of navigation in ice estimates.

2. The small boats of the Japanese and Chinese projects by the criterion of the safe speed of navigation in ice estimate are consistent with the level of similar size Russian fishing vessels.

3. Large fishing ships of European projects on this criterion is much lower than Russian fishing vessels.

4. The acting rules of the Register regulate speed of ships in broken ice for at least 5 knots. In these examples, only the ships of Norwegian series (# 8) does not reach this level.

5. In general, projects of Russian ships are different from foreign higher strength of bow structures.

Analysis of the results of calculations shows

The comparison of the values of safe speed of fishing ships navigation in ice

1. Ice cross abilities have a clear tendency to increase with increasing of ships’ sizes.

2. According to the criterion of the ice-going in the solid ice Niall close match assessments of foreign ships with Russian throughout the range of sizes of fishing ships.

3. The relatively high valuation of ice cross ability (up to 30%) correlates the Japanese project (# 5)

Analysis leads to the following conclusions

The comparison of ships' ice-going in solid ice

The comparison of options by the potential loss of the propulsion under the broken ice compression

The variants of fishing vessels are matched on body strength assessment in the ice capture

The comparison of the options of fishing vessels by the generalized complex criterion

Especially the high assessment of the ice-going property is characteristic of the considered Japanese project (# 5), which is an expected result:

1) the fishing vessel of the Japanese project is newer and more modern than the considered Russian ships;

2) a large series of Japanese ships (# 5), adapted especially for the conditions of fishery in the Sea of Okhotsk

Ships of the European projects (# 8, 9 and 11) are larger than the Chinese (# 4) and Japanese (# 5), but the assessment of the ice-going properties of the considered fishing vessels of European projects inferior the vessels of Russian projects

The analysis shows that the Chinese fishingships (# 4) and Japanese (# 5) projects by the comprehensive criteria of the ice-going greatly exceed the fishing ships of Russian projects

The results show the way for the development of fishing ships construction for the navigation in the ice conditions in the Far Eastern seas of Russia, in particular in the Sea of Okhotsk.

The results of the study are intended to be used in the development of methodology for the design of new fishing vessels, as well as for the examination of existing projects of fishing vessels, planned to renovation of the fishing fleet and elimination of the deficit of new fishing vessels tonnage subject to planning for the long term.

C O N C L U S I O N S

The set of complex systems of sea fishing expeditions predetermines the need to pay adequate attention to the vessels of other classes, providing:

overload and storage of fish and seafood;

processing, transportation products;

uninterrupted supply of fishing vessels with fuel and supplies;

inspection and process monitoring of industrial fishing;

ensure the safety of fishing in freezing seas.

C O N C L U S I O N S