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<p>Climate change has led to new shipping routes in polar waters, increasing touristic and commercial traffic in these regions. Sequentially, collisions between ship propellers and sea ice have become more frequent. Such collisions subject the propellers to extreme dynamic loads, which are transferred through the propeller shaft to the sliding stern tube bearings, particularly the bearing mounted next to the propeller (aft bearing). These collision loads have been linked to indications of fatigue and wear in sliding bearings. To determine whether these loads contribute to the increasing wear and fatigue damage in bearings, it’s essential to investigate their impact on contact conditions and stress concentration in the bearing. While recent research on stern tube bearing damage has focused on wear, the investigation of fatigue damage remains unexplored.</p><p>This study aims to assess the impact of ice-induced loads on the remaining fatigue-life of the aft bearing using the research vessel SA Agulhas&#xa0;II as a&#xa0;case study. For this purpose, four design ice load cases and five field-measured ice load cases are used. The impact of ice-induced loads on the local stress tensors are obtained through multi-body and finite element simulations incorporating elastohydrodynamic effects, followed by the calculation of the DANG VAN’s equivalent stress. This is followed by assessing the partial damage from a&#xa0;single cycle of ice-induced load on the aft bearing using the Palmgren-Miner method. Finally, the remaining fatigue-life is determined based on the calculated damage from a&#xa0;single cycle of ice-induced loads. This represents the remaining number of load cycles until damage occurs, indicating the impact of ice-induced loads on fatigue risk.</p>

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Evaluation of fatigue damage in stern tube sliding bearings of ship propulsion systems under ice impact

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月25日

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  • Ahmed Saleh,
  • Marco Könekamp,
  • Georg Jacobs,
  • Markus Gilges,
  • Benjamin Lehmann,
  • Math Lucassen

摘要

Climate change has led to new shipping routes in polar waters, increasing touristic and commercial traffic in these regions. Sequentially, collisions between ship propellers and sea ice have become more frequent. Such collisions subject the propellers to extreme dynamic loads, which are transferred through the propeller shaft to the sliding stern tube bearings, particularly the bearing mounted next to the propeller (aft bearing). These collision loads have been linked to indications of fatigue and wear in sliding bearings. To determine whether these loads contribute to the increasing wear and fatigue damage in bearings, it’s essential to investigate their impact on contact conditions and stress concentration in the bearing. While recent research on stern tube bearing damage has focused on wear, the investigation of fatigue damage remains unexplored.

This study aims to assess the impact of ice-induced loads on the remaining fatigue-life of the aft bearing using the research vessel SA Agulhas II as a case study. For this purpose, four design ice load cases and five field-measured ice load cases are used. The impact of ice-induced loads on the local stress tensors are obtained through multi-body and finite element simulations incorporating elastohydrodynamic effects, followed by the calculation of the DANG VAN’s equivalent stress. This is followed by assessing the partial damage from a single cycle of ice-induced load on the aft bearing using the Palmgren-Miner method. Finally, the remaining fatigue-life is determined based on the calculated damage from a single cycle of ice-induced loads. This represents the remaining number of load cycles until damage occurs, indicating the impact of ice-induced loads on fatigue risk.