Modern Tribological Solutions in Renewable Power Systems

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: 30 November 2026 | Viewed by 918

Editors


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Guest Editor
SKF Research & Technology Development, Meidoornkade 14, 3992 AE Houten, The Netherlands
Interests: tribology; friction; wear; surface fatigue; boundary and mixed lubrication; surface design

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Guest Editor
Sentys Inc., San Francisco, CA 94114, USA
Interests: tribology; namomechanics; coatings; surface engineering
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Special Issue Information

Dear Colleagues,

The role of renewable power systems is becoming increasingly important as global energy infrastructures transition toward sustainable, low‑emission technologies in response to environmental, economic and political factors.

A key trend in this technological field—particularly, in wind turbines—is the adoption of larger rotors and higher power transmission at reduced rotational speeds. As a consequence, mechanical components such as bearings and gears are expected to face increased tribological challenges arising from poorer lubrication conditions combined with higher contact stresses, which, in turn, increase the risk of surface‑initiated failures in such applications.

To enhance surface durability and optimize performance, modern tribological approaches, including specialized surface designs, protective coatings, advanced lubricants, and engineered surface (tribo-)layers, offer versatile and effective means of adapting mechanical components to demanding operational environments.

This Special Issue of MDPI’s Lubricants, titled ‘Modern Tribological Solutions in Renewable Power Systems’, will address these technical and scientific challenges and welcomes high‑quality contributions from researchers worldwide.

Dr. Victor Brizmer
Prof. Dr. Esteban Broitman
Guest Editors

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Keywords

  • wind turbines
  • hydropower, tidal and wave energy
  • rolling element bearings
  • sliding bearings
  • gears
  • surface design
  • fully formulated oils
  • greases
  • wear
  • micropitting
 

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Published Papers (2 papers)

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Research

14 pages, 14223 KB  
Article
A Fundamental Study on the Friction Reduction Characteristics of Microbubbles in Journal Bearings: Mechanics and Visualization
by Yuki Yoshimura, Shodai Sakabe, Yuki Kawamoto, Akihiko Azetsu and Masayuki Ochiai
Lubricants 2026, 14(8), 288; https://doi.org/10.3390/lubricants14080288 - 26 Jul 2026
Viewed by 221
Abstract
Improving motor efficiency by reducing frictional losses in the journal bearings used in many rotating machines is critical for advancing sustainable mechanical systems, especially automobiles. This study investigates the application of microbubbles, which are known to reduce frictional drag in fluids. The incorporation [...] Read more.
Improving motor efficiency by reducing frictional losses in the journal bearings used in many rotating machines is critical for advancing sustainable mechanical systems, especially automobiles. This study investigates the application of microbubbles, which are known to reduce frictional drag in fluids. The incorporation of microbubbles into lubricants offers an environmentally friendly friction-reduction method that avoids chemical additives. In this work, microbubbles were generated within lubricating oil and applied to a journal bearing. Experimental measurements of friction torque during shaft rotation demonstrated that lubricating oil containing microbubbles yielded lower torque than oil without microbubbles. These results indicate that microbubbles effectively reduce friction in journal bearings. Furthermore, a transparent quartz glass bearing and acrylic shaft were used to directly observe the dynamics of microbubbles flowing within the journal bearing clearance to elucidate the underlying frictional torque reduction mechanism. Full article
(This article belongs to the Special Issue Modern Tribological Solutions in Renewable Power Systems)
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17 pages, 7098 KB  
Article
Positive Antiwear Interaction Between ZDDP and CNTs, GNPs and FLGs Under Boundary Lubrication
by Juan Pablo Abdelnabe, Walter Roberto Tuckart, Eduardo Tomanik, Wania Christinelli and Germán Prieto
Lubricants 2026, 14(7), 252; https://doi.org/10.3390/lubricants14070252 - 26 Jun 2026
Viewed by 423
Abstract
Industrial gear contacts operate under mixed-to-boundary lubrication where reliable antiwear protection is essential. This study assesses whether carbon nanomaterials can enhance the performance of zinc dialkyldithiophosphate (ZDDP) under severe conditions. A crossed-cylinder Reichert configuration (2 GPa, 75 °C, 1 m/s) with PAO6 was [...] Read more.
Industrial gear contacts operate under mixed-to-boundary lubrication where reliable antiwear protection is essential. This study assesses whether carbon nanomaterials can enhance the performance of zinc dialkyldithiophosphate (ZDDP) under severe conditions. A crossed-cylinder Reichert configuration (2 GPa, 75 °C, 1 m/s) with PAO6 was used to test ZDDP (1 wt%) and its blends with carbon nanotubes (CNT, 0.05 wt%), graphene nanoplatelets (GNP, 0.05 wt%), and few-layer graphene (FLG, 0.05 wt%) at 1, 10 and 60 min. The lubrication regime was boundary. Friction, specific wear rate (k), and tribofilm coverage were quantified. Oils containing only carbon nanoparticles could not sustain the test (seizure within minutes), confirming the necessity of ZDDP. After 60 min, average CoF remained similar across formulations and largely governed by ZDDP. By contrast, wear showed marked differences: relative to ZDDP alone (A), ZDDP + CNT (F) and ZDDP + GNP (G) reduced k by 52% and 48%, respectively, and exhibited higher tribofilm coverage (F = 68%, G = 72% vs. A = 57%). Time-resolved tests revealed that long-duration degradation was mitigated in F and G: from 10 to 60 min, k rose by 72% (F) and 58% (G) versus 159% for A; coverage decreased by only 8% (F) and 3% (G) versus 22% for A. SEM–EDS indicated no major differences in average elemental chemistry among formulations, suggesting an improvement on tribofilm coverage/stability rather than compositional change. Full article
(This article belongs to the Special Issue Modern Tribological Solutions in Renewable Power Systems)
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