Open AccessDynamic loads in shaft lines of ice going ships. Case study: Akademik Tryoshnikov research vessel
Author(s) -
Aleksandr Chernyshev,
I Galina Bukharina,
A Olga Kontievskaya
Publication year - 2019
Publication title -
trudy krylovskogo gosudarstvennogo naučnogo centra
Language(s) - English
Resource type - Journals
eISSN - 2618-8244
pISSN - 2542-2324
DOI - 10.24937/2542-2324-2019-1-s-i-177-182
Subject(s) - harmonics , rotation (mathematics) , frequency domain , harmonic , structural engineering , geology , marine engineering , acoustics , physics , engineering , computer science , mathematics , geometry , electrical engineering , voltage , computer vision
This paper presents monitoring results for static and dynamic (torsional) loads in shaft lines of Akademik Tryoshnikov research vessel in open water and in ice. Comparison of these results has shown that dynamic loads in ice conditions are not only considerably higher than open-water ones, but may also exceed acceptable limits even if shaft diameters are increased as per RS recommendations. It has also been found that this difference is especially stark not only at rotation speeds corresponding to the 1st blade harmonic resonance (usually at 70–100 % of nominal RPM), but are also considerableat higher-order resonances (between 2nd and 5th blade harmonics) in low-frequency domain never studied before. These results mean that test procedures for ice-going ships have to be updated, so as to include identification of undesirable RPMs for their shaft lines.