Investigation on semi-empirical coefficients and exponents of a resistance prediction method for ships sailing ahead in level ice

ABSTRACT

In this paper, the semi-empirical coefficients and exponents of an ice resistance prediction method, i.e. refined Lindqvist formula, are investigated. Thereby, the coefficients and exponents which are not fully based on analytical considerations or geometrical properties are substituted by variables. By means of a computer algorithm these variables are optimised within specific boundary limits with regard to the total resistance in ice. Furthermore, the state of the art ranges for the ice resistance portions induced at the water line and below the water line are considered. The optimisation is based on a set of scaled model tests with several ice breaking ship models under different conditions, i.e. ship speed and level ice thickness.

KEYWORDS:

• Ice breaking ships
• level ice
• optimisation algorithm
• resistance prediction
• total resistance in ice

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Acknowledgements

The authors would like to thank the national project coordinator PTJ for their administration work under the framework of the joint research project ProEis.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The financial support of HSVA and the Federal Ministry for Economic Affairs and Energy (BMWi) under the framework of the joint research project ProEis [project number 03SX391A] is gratefully acknowledged.