TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE

Science journal

 
ISSN (print) 2542-2324 /(online) 2618-8244


Articles of The Transactions of KSRC








Design of ice-class propellers: ice load mitigation and strength calculations



Full text article ( in russian)

Year

 
2020

Issue

 
20201

Volume

 
1

Pages

 
11–17

Caption

 
Design of ice-class propellers: ice load mitigation and strength calculations

Authors

 
Andryushin A., Khlystova K.

Keywords

 
icebreaker, propeller, main motor, ice loads

DOI

 
10.24937/2542-2324-2020-1-S-I-11–17

Summary

 
Object and purpose of research. This paper discusses ice-class propellers to develop the methods for their optimization in terms of ice loads, including calculation methods for ice loads and strength parameters
Subject matter and methods.This work is based on existing design methods for ice-class propellers, as well as on available materials on strength parameters of ice features and the results of full-scale trials for ice-class ships
Main results. This paper describes overall methodology adopted by TsNIIMF JSC to calculate ice loads on propellers and main motors of ice-going ships. It is shown that ice load assignment for the propeller must always take into account main motor parameters. The study also analyses the effect of propeller strength parameters upon level-ice loads, giving some recommendations on ice load mitigation for both propeller and main motor and discussing the ways to ensure propeller blade strength, including local strength of their edges
Conclusion. Ice loads on the propeller must always be analysed in conjunction with main motor operability, which means that main motor must maintain required power, torque, and RPM even when the propeller suffers ice load, to prevent it from stopping (jamming) and breaking, and to deliver required propulsion thrust. Currently, the methodology described in this paper is used by TsNIIMF JSC for design of modern icebreaking propellers and formulation of performance requirements to main propulsion motors installed aboard modern icebreakers.

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