Authors: V.V. Platonov, V.N. Tryaskin
Abstract
The hull shape of modern icebreakers can significantly differ from the traditional one covered by requirements of the acting RS Rules. The application of the existing Rule formulations to determine ice loads on icebreaker hull of unusual shape can potentially lead to an error in load prediction. The application of the existing formulations to the vertical hull is not even feasible at present. Currently determination of the calculated ice loads on the middle and aft ice reinforcement areas of icebreakers is based on a conservative. approach, which does not take into account real physical aspects of the interaction between the icebreaker's hull and ice under various operating modes. This article provides a description of the methodological foundations for the development of design dependencies for determining ice loads on ice reinforcement structures of icebreakers. Design dependencies cover the bow, middle and stern regions. They are based on a new model of ice dynamic fracture, and developed with a view of their implementation into the RS Rules.
Keywords: icebreaker, areas of ice reinforcement, calculated dependencies, model of dynamic ice destruction.
References
1. Rules for the Classification and Construction of Sea–Going Ships. —Part II. Hull. Russian Maritime Register of Shipping. — St. Petersburg., 2020.
2. Kudyumov V.A., Kheysin D.E. Gidrodinamicheskaya model udara tverdogo tela o lyod [Hydrodynamic model of a solid body impact on the ice] Applied mechanics, 1976, vol. 12, Nо. 10, рр. 104 — 109.
3. Appolonov E.M., Platonov V.V. Novya model dinamicheskogo razrusheniya lda kak osnova dlya sovershenstvovaniya trebovaniy Pravil Registra k ledovym usileniyam sudov i ledokolov [New model of dynamic ice failure as basis for improvement of RS requirements to ice belts of ice-going ships and icebreakers] Transactions of the Krylov State Research Centre, 2019, nо. 4 (390), рр. 99 — 116.
4. Platonov V.V., Tryaskin V.N., Isaeva D.T. Analiz osobennostey formy korpusa traditsionnykh i sovremennykh ledokolov [Hull shape peculiarities of conventional and model icebreakers: analysis] // Transactions of the Krylov State Research Centre. 2020; Special Edition 2: 63 — 67.
5. Appolonov E.M. Ledovaya prochnost sudov, prednaznachennykh dlya kruglogodichnoy arkticheskoy navigatsii [Ice strength of ships for allyear-round Arctic navigation] St. Petersburg State Marine Technical University, 2016, 288 р.
6. Platonov V.V., Tryaskin V.N. Metodicheskie osnovy opredeleniya raschetnykh ledovykh nagruzok na korpus sovremennykh sudov ledovogo plavaniya v nosovom i kormovom rayonakh [Methodological basis for determining the design ice loads on the hull of modern ice vessels in the bow and stern areas] Arctic: Ecology and Economy, 2019, No. 4 (36), рр. 83 — 98. DOI: 10.25283/2223-4594-2019-4 -83-98.
7. Aleksandrov A.V., Platonov V.V., Tryaskin V.N. Razrabotka proekta trebovaniy Pravil RS k konstruktsii ledovykh usileniy korpusa sudov, prednaznachennykh dlya expluatatsii kormoy vpered [Development of draft RS Rules requirements for hull ice strengthening of ships designed for astern operation] Research Bulletin by Russian Maritime Register of Shipping, 2018, Dec., no. 52/53, pp. 47 — 56.
8. Appolonov E.M., Platonov V.V., Tryaskin V.N. Metodika normirovaniya ledovykh nagruzok na konstruksii nosovoy okonechnosti sudov s vertikalnym bortom i bulbovymi obvodami [Ice load assignment procedure for bows of ships with vertical sides and bulbous lines] Transactions of the Krylov State Research Centre, 2019, special. iss. 1, pp. 17 — 23.
About authors:
V.V. Platonov - PhD, Krylov State Research Centre, St. Petersburg, e-mail: viktorplatonov@yandex.ru.
V.N. Tryaskin - DSc, professor, St. Petersburg state marine technical university, St. Petersburg, e-mail: tryaskin.vn@yandex.ru.
Issue: 62/63 (2021)
For citation: V.V. Platonov, V.N. Tryaskin. Methodological basis for the calualtion of ice loads acting on an icebreaker's hull based on a new model of dynamic ice fracture. Research Bulletin by Russian Maritime Register of Shipping. 2021, No. 62/63, pp. 78-88.
UDC 629.5.011; 629.561.5
Fr: 8:30 – 16:15 (msk)