Rok 2023

• Comparative wear test of journal sliding bearings with sintered bronze and Babbitt alloy bushes lubricated by environmentally acceptable/adapted lubricants (EAL)

  Publikacja

  • J. Frost
  • W. Litwin

  - TRIBOLOGY TRANSACTIONS - Rok 2023

  A growing awareness of the negative effects of mineral oils on the natural environment has resulted in the introduction of new regulations related to environmental protection. One of these regulations requires the use of environmentally acceptable/adapted lubricants (EAL) to lubricate marine main shaft bearings, in place of the mineral lubricating oils that have been used for decades. Classification Societies, which supervise...

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Rok 2019

• Marine propeller shaft bearings under low-speed conditions: water vs. oil lubrication

  Publikacja

  • W. Litwin

  - TRIBOLOGY TRANSACTIONS - Rok 2019

  The bearings used in shipbuilding, hydropower, and water pumps have undergone a metamorphosis in recent decades. Because of environmental regulations, lubrication with grease or mineral oil is prohibited. Thus, the standard solutions include water-lubricated bearings with polymer bushings or sealed systems lubricated with oil. When properly designed, assembled, and operated, bearings can operate reliably for years. However, specific...

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Rok 2015

• Centrally Pivoted Tilting Pad Thrust Bearing with Carbon-Based Coated Collar—Experimental Results of Low- and Medium-Speed Operation

  Publikacja

  • M. Wasilczuk
  • M. Wodtke
  • W. Braun

  - TRIBOLOGY TRANSACTIONS - Rok 2015

  Experimental results of the research on a tilting pad thrust bearing with symmetrical pad support in the conditions of high loads and low speeds are presented in the paper. As described in the literature review, experimental results of tilting pad bearings at low speed/high load regime and transient conditions are rare. Unusual material selection - steel pad against a DLC-type coating on the collar was utilized. Such material combination...

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Rok 2014

• Water-Lubricated Sintered Bronze Journal Bearings—Theoretical and Experimental Research

  Publikacja

  • W. Litwin
  • A. Olszewski

  - TRIBOLOGY TRANSACTIONS - Rok 2014

  Water lubricated bearings are used from many years in shipbuilding, hydro power and other industries because of their advantages such as: extensive serviceable life, low coefficient of friction, longevity of shaft sleeve, good abrasion resistance, low maintenance required, unit simplicity, no danger of pollution and low price. Various types of water lubricated sliding bearings have been tested at the Technical University of Gdansk...

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Rok 2011

• Influence of surface roughness topography on properties of water lubricated polymer bearings, experimental research

  Publikacja

  • W. Litwin

  - TRIBOLOGY TRANSACTIONS - Rok 2011

  W artykule przedstawiono wyniki badań eksperymentalnych, których celem było zidentyfikowanie wpływu ułożenia chropowatości na powierzchni ślizgowej łożyska smarowanego wodą z polimerową panwią. Badania wykazały, że wpływ ten jest mniejszy niż oczekiwano a na własności łożyska ma wpływ głównie wysokość chropowatości.

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Rok 2009

• Structural properties of foil bearings: a closed-form solution validated with finite element analysis

  Publikacja

  • P. Hryniewicz
  • M. Wodtke
  • A. Olszewski
  • R. Rządowski

  - TRIBOLOGY TRANSACTIONS - Rok 2009

  Fluid film thickness in a compliant foil bearing is greatly influenced by the deflection of the bearing structure. Therefore, in order to properly model performance of a foil bearing, it is mandatory that the deflection of the compliant bearing structure due to the generated hydrodynamic pressure is determined accurately. This article proposes an easy-to-use two-dimensional model, which takes into account detailed geometry of the...