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Lubricants, Volume 11, Issue 9

September 2023 - 61 articles

Cover Story: To increase the power density of the electromechanical drive train of wind turbines, journal bearings are used as planetary gear bearings instead of rolling bearings. The successful implementation of journal bearings in wind turbines depends on the reliable estimation of wear. In this paper, five different models for the wear calculation of journal bearings are evaluated regarding their suitability for the wear calculation of planetary gear journal bearings in wind turbines. In order to be able to evaluate the wear models, the wear models are numerically implemented and the wear of a test journal bearing is exemplarily calculated under load conditions, which are comparable to load conditions in a wind turbine. The resulting evaluation allows for the pre-selection of a suitable wear model. View this paper
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Articles (61)

  • Article
  • Open Access
7 Citations
2,330 Views
29 Pages

Modeling Wear and Friction Regimes on Ceramic Materials with Positive and Negative Thermal Expansion

  • Aleksandr S. Grigoriev,
  • Evgeny V. Shilko,
  • Andrey I. Dmitriev and
  • Sergei Y. Tarasov

21 September 2023

Computer modeling of rubbing between two surfaces with microasperities capable of expanding or contracting under conditions of frictional heating (i.e., possessing either positive and negative coefficient of thermal expansion (CTE)) allowed for the i...

  • Article
  • Open Access
3 Citations
2,334 Views
16 Pages

21 September 2023

This study investigated the high-speed cutting performance of 7050 aluminum alloy with prefabricated crystal orientations under dry-cutting conditions. Three specimens with different crystal orientations were prefabricated using pre-deformations of 1...

  • Article
  • Open Access
8 Citations
2,476 Views
14 Pages

Effect of Oxygen and Moisture on the Friction and Wear of Carbon Fiber-Reinforced Polymers

  • Pontus Johansson,
  • Pär Marklund,
  • Marcus Björling and
  • Yijun Shi

20 September 2023

Carbon fiber-reinforced polytetrafluoroethylene (CF/PTFE) composites are frequently used in tribological dry gas applications, such as in dynamic seals in reciprocating hydrogen gas compressors and Stirling engines, due to their superior friction and...

  • Article
  • Open Access
9 Citations
2,629 Views
16 Pages

20 September 2023

Diaphragm plates, a key part of high-pressure hydrogen gas compressors, are easily cracked or broken due to repeated shape deformations caused by pressure, resulting in increasing difficulties in maintenance. This study aimed to improve the durabilit...

  • Article
  • Open Access
9 Citations
2,259 Views
15 Pages

18 September 2023

Nanofluid lubrication and machining are challenging and significant tasks in manufacturing industries that are used to control the removal of a material from a surface by using a cutting tool. The introduction of a nanofluid to the cutting zone provi...

  • Article
  • Open Access
7 Citations
2,484 Views
17 Pages

A New Experimental Methodology to Study Convective Heat Transfer in Oil Jet Lubricated Gear Units

  • Thibaut Torres,
  • Christophe Changenet,
  • Thomas Touret and
  • Bérengère Guilbert

18 September 2023

The purpose of this study is to generate some experimental data associated with the thermal heat exchange between an oil jet flow and a rotating gear. To this end, a specific test bench was designed. The principle of this test bench is to inject oil...

  • Article
  • Open Access
2 Citations
2,504 Views
22 Pages

18 September 2023

Efforts to enhance quality control (QC) practices in chip seal construction have predominantly relied on single surface friction metrics such as mean profile depth (MPD) or friction number. These metrics assess chip seal quality by targeting issues s...

  • Article
  • Open Access
1 Citations
2,059 Views
13 Pages

Investigation of Friction Coefficient Changes in Recycled Composite Materials under Constant Load

  • Aydın Güneş,
  • Hayrettin Düzcükoğlu,
  • Emin Salur,
  • Abdullah Aslan and
  • Ömer Sinan Şahin

18 September 2023

The surface quality of machine elements may deteriorate over time while operating under different conditions. This deterioration adversely affects the wear behavior in the contact areas, and these materials become unusable over time. In machine eleme...

  • Article
  • Open Access
7 Citations
5,492 Views
16 Pages

17 September 2023

Due to the intense noise interference in hydraulic systems, it is extremely difficult to detect component faults through vibration signals. Diagnostic performance is also constrained by highly time-varying and non-stationary operating conditions. Thi...

  • Article
  • Open Access
2 Citations
2,366 Views
15 Pages

Effect of Graphene on Nickel Surface Relaxation: Molecular Dynamics Simulation

  • Sergiy Konorev,
  • Vitalii Yanchuk,
  • Ivan Kruhlov,
  • Andrii Orlov,
  • Sergii Sidorenko,
  • Igor Vladymyrskyi,
  • Sergey Prikhodko and
  • Svitlana Voloshko

16 September 2023

The effect of graphene (GR) on Ni surface relaxation and reconstruction in three different substrate orientations, {111}, {001}, and {011}, at two different temperatures, 300 K and 400 K, was studied using molecular dynamics simulation. The change in...

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Lubricants - ISSN 2075-4442