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Hydraulic Damper Concept for Thruster Ice Impact Load Reduction

[+] Author Affiliations
Lauri Siivonen, Kalevi Huhtala

Tampere University of Technology, Tampere, Finland

Paper No. FPMC2017-4238, pp. V001T01A018; 10 pages
  • ASME/BATH 2017 Symposium on Fluid Power and Motion Control
  • ASME/BATH 2017 Symposium on Fluid Power and Motion Control
  • Sarasota, Forida, USA, October 16–19, 2017
  • Conference Sponsors: Fluid Power Systems and Technology Division
  • ISBN: 978-0-7918-5833-2
  • Copyright © 2017 by ASME


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.

Copyright © 2017 by ASME
Topics: Stress , Dampers , Ice



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