Authors: E.B. Karulin, M.M. Karulina
Abstract
The icebreaking capability is one of the most important parameters for operation of icebreakers and ice-going ships. The icebreaking capability is defined by the maximum thickness of solid level ice that the ship in question can negotiate at the minimum steady speed (2-3 knots) under full power and depends on the ship hull form and propulsion system details as well as power output. This paper presents an approach intended to derive a simple criterion to assess such capability for icebreakers. The formula for icebreaking capability criterion is structured based on simple physical considerations: icebreaking capability is proportional to the total shaft power of propellers and inversely proportional to the ship beam on waterline. The formula coefficients are found using the least-square method treatment of actual data collected from known icebreakers. Icebreaking capability assessments are done for vessels not included in the reference data samples. Specific aspects related to extension of the formula from icebreakers to commercial ice-class carriers and supply vessels have been considered. It has been shown that the said criterion is useful in prompt icebreaking capability evaluations for practical decision-making tasks like choice of suitable vessels for certain icebreaker operations related to convoy assistance, towage or ice-management operations.
Keywords: icebreaking capability, icebreaker, power, regression model, least-square method.
References
1. Kashtelyan V.I., Ionov B.P., Ilchuk A.N. Otsenka ledoprokhodimosti ledokolov i transportnykh sudov ledovogo plavaniya na nachalnoy stadia proektirovaniya [Assessment of ice performance of ice breakers and ice navigation transport vessels at the initial designing stage] Tr. AANII, vol. 376, pp. 22 — 25.
2. Tsoy L.G. Morskie ledokoly. Osobennosti proektirovaniya. Ucheb. posobie [Sea ice breakers. Specifics of Designing. A study guide.] SPbGMTU, SPb, 2003, 110 p.
3. Klimashevskiy S.N. Raschet ledoprokhodimosti ledokolov i sudov ledovogo plavaniya, analiz parametrov formy korpusa etikh sudov [Calculation of ice performance of ice breakers and ice navigation ships, analysis of their hull shape parameters] Sudostroenie, No. 3, 2012, (802), May — June.
4. Ionov B.P, Gramuzov E.M. Ledovaya khodkost sudov [Ice performance of ships] / 2 nd Edition, amended. — SPb: Sudostroenie, 2013. — 504 p.
5. Ermakov S.M., Zhiglyavskiy A.A. Matematicheskaya teoriya optimalnogo eksperimenta Ucheb. Posobie [Mathematical theory of optimal experiment. A study guide] — M.: Nauka. Gl. Red. Fiz. mat. Lit., 1987. — 320 p.
6. Ionov B.P., Gramuzov E.M., Zuev V.A. Proektirovanie ledokolov [Designing ice breakers] — SPb: Sudostroenie, 2014. — 512 p.
7. Rusetskiy A.A., Zhuchenko M.M., Dubrovin O.V. Sudovye dvizhiteli uchebnik [Ship propulsion: a study guide]/. — Leningrad: Sudostroenie, 1971. — 288 p.
8. Basin A M., Miniovich I.Ya. Teoriya i raschet grebnykh vintov [Theory and calculation of ship propellers]. — L.: Sudpromgiz, 1963. — 760 p.
9. Kashtelyan V.I. et al. Soprotivlenie lda dvizheniyu sudna [Ice resistance to ship movement] — L.: Sudostroenie, 1968. — 238 p.
10. Venttsel E.S. Teoriya veroyatnostey uchebnik [Probabilities theory: a study guide]– 10th Edition. — Moskva: Akademiya, 2005. — 576 p.
11. Riska K., Leiviskä T., Nyman T., Fransson L., Lehtonen J., Eronen H., Backman A. Ice performance of the Swedish multi-purpose icebreaker Tor Viking II. Proc. of the 16th Int. Conference on Port and Ocean Engineering under Arctic Conditions POAC'01, Ottawa, Ontario, Canada, 2001.
12. Kim H.S., Lee C.-J., Choi K. The study on the ice sea trial in Chukchi sea using Korean icebreaker "Araon". Proc. of the 30th International Conference on Ocean, Offshore and Arctic Engineering, OMAE'2011, Rotterdam, Netherlands, OMAE2011-49482, 2011.
About authors:
E.B. Karulin - PhD, Krylov State Research Centre, St. Petersburg, e-mail: evgeny@ek17106.spb.edu
M.M. Karulina - PhD, Krylov State Research Centre, St. Petersburg, e-mail: marina@ek17106.spb.edu
Issue: 62/63 (2021)
For citation: E.B. Karulin, M.M. Karulina. Evaluation of ship icebreaking capability based on a simple criterion. Research Bulletin by Russian Maritime Register of Shipping. 2021, No. 62/63, pp. 62-73.
UDC 629.5.017
Fr: 8:30 – 16:15 (msk)