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Experimental study on distributed tribo-dynamic behavior of full-scale water-lubricated journal bearing with large aspect ratio
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Qi-lin LIU1a, Wu OUYANG1a, 1b, 1c, Xue-kuan YU1a, Yong JIN1a, Lei WANG2
Journal of Ship Mechanics | 2026, 30(5) : 699 - 707
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Journal of Ship Mechanics | 2026, 30(5): 699-707
• Hydrodynamics •
Experimental study on distributed tribo-dynamic behavior of full-scale water-lubricated journal bearing with large aspect ratio
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Qi-lin LIU1a, Wu OUYANG1a, 1b, 1c, Xue-kuan YU1a, Yong JIN1a, Lei WANG2
Affiliations
  • 1a.Wuhan University of Technology State Key Laboratory of Maritime Technology and Safety Wuhan 430063, China
  • 1b.Wuhan University of Technology State Key Laboratory of Maritime Technology and Safety Wuhan 430063, China
  • 1c.Wuhan University of Technology National Engineering Research Center for Water Transport Safety, Wuhan 430063, China
  • 2.China Ship Development and Design Center, Wuhan 430064, China
Published: 2026-05-15 doi: 10.3969/j.issn.1007-7294.2026.05.004
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Under low-speed and deflection conditions, water-lubricated journal bearings (WLJBs) with large length-to-diameter ratios frequently exhibit abnormal wear and frictional vibrations, significantly compromising ship reliability and stealth capabilities. However, comprehensive experimental investigations on full-scale WLJBs remain insufficient, and the evolutionary mechanisms of dynamic behaviors under varying service conditions require further exploration. This study developed a distributed testing system for WLJBs based on a full-scale propulsion shafting test rig, and conducted running-in, speed characteristic, and elevation characteristic tests. From the perspective of tribological characteristics and lubrication zoning, the dynamic behavioral variations of different lubrication sub-regions under operational conditions are systematically revealed. The experimental results demonstrate that increased rotational speeds exacerbate shaft journal deflection, inducing hydrodynamic pressure peak migration toward the free-end lubrication sub-region; elevation modifications alter load distribution patterns among lubrication sub-regions, and distinct lift-off characteristics emerge among different lubrication sub-regions. These results provide critical validation data for developing dynamic models and optimizing structural designs of full-scale WLJBs in marine propulsion systems.

full-scale  /  large length-to-diameter ratio  /  water-lubricated journal bearing  /  distributed  /  tribological characteristic  /  dynamic behavior
Qi-lin LIU, Wu OUYANG, Xue-kuan YU, Yong JIN, Lei WANG. Experimental study on distributed tribo-dynamic behavior of full-scale water-lubricated journal bearing with large aspect ratio[J]. Journal of Ship Mechanics, 2026 , 30 (5) : 699 -707 . DOI: 10.3969/j.issn.1007-7294.2026.05.004
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Year 2026 volume 30 Issue 5
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doi: 10.3969/j.issn.1007-7294.2026.05.004
  • Receive Date：2025-07-10
  • Online Date：2026-07-07
  • Published：2026-05-15
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  • Received：2025-07-10
Affiliations
    1a.Wuhan University of Technology State Key Laboratory of Maritime Technology and Safety Wuhan 430063, China
    1b.Wuhan University of Technology State Key Laboratory of Maritime Technology and Safety Wuhan 430063, China
    1c.Wuhan University of Technology National Engineering Research Center for Water Transport Safety, Wuhan 430063, China
    2.China Ship Development and Design Center, Wuhan 430064, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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