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Hydraulic Damper Concept for Thruster Ice Impact Load Reduction

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publicationASME/BATH 2017 Symposium on Fluid Power and Motion Control
Place of PublicationSarasota, FL, USA
Number of pages10
ISBN (Electronic)978-0-7918-5833-2
Publication statusPublished - 19 Oct 2017
Publication typeA4 Article in a conference publication
EventASME/BATH Symposium on Fluid Power and Motion Control - , United Kingdom
Duration: 1 Jan 1900 → …


ConferenceASME/BATH Symposium on Fluid Power and Motion Control
CountryUnited Kingdom
Period1/01/00 → …


Steerable thrusters are used to maneuver a vessel in open sea environment. The harsh environment of arctic seas introduces certain challenges with propellers hitting ice and decreasing lifetime of the system, as the loads generated by ice impacts are significantly higher than nominal loads. Damping of an ice impact load is a difficult task since the impacts have high torsional loads and they occur only in a fraction of the lifetime of the system. Commercial dampers are hard to find since they do not generally have the capacity for damping such high loads. The proposed active hydraulic damper reduces ice impact loads by accelerating and decelerating the shaft line. The lack of space and commercial components narrow down the possibilities but simulation results with the system show some positive effects in typical ice impact scenario. The system also recuperates most of the used energy and stores it to accumulator.

Publication forum classification

Field of science, Statistics Finland