About this Research Topic
The engine tribologist is facing tough regulations with respect to CO2 emissions. These restrictions have led to the development of advanced lubricants for all moving components of modern propulsion systems (e.g. for on/off-road vehicles, marine and rail engines). Bearings, pistons, transmissions, clutches, gears, and drivetrain components are some of the mechanical parts with prime importance. This lubrication task is very challenging owing to the wide range of operating conditions encountered in such systems, such as speed, load and temperature. Under boundary/mixed regime of lubrication, direct physical contact has dominant impact in lubricant rheology.
Advanced lubricants must protect the conjugating surfaces with environmentally friendly behaviour. These conditions may benefit from the use of advanced nanoparticles with the following needs: (i) to protect the surface topography under high loads and temperatures, (ii) to enhance lubricant properties and degradation time and (iii) to enable all these at minimal cost and greater safety. Therefore, this topic promotes the optimal tribological behavior of key engine components, as they are expected to provide an improved environmental and economic footprint. An important innovation in this field of research is the view of ecological tribology using advanced and biocompatible lubricants which aim to minimize the environmental footprint of the engine.
Nowadays, there are many propulsion system applications for advanced lubricants in on-/off-road vehicles as well as in marine, aviation or rail transportation. Engine performance, especially tribological performance, depends on the lubricants and their rheological properties. The goal of this Research Topic is to highlight advances in recent tribological evolution and desirable topics for future development including advanced lubricants, fuel efficiency, emissions, and durability.
The understanding of failure mechanisms such as wear, scuffing, and fatigue is of particular interest. For this, is particularly important the use of advanced computational codes and tribometers of lab scale to mimic friction, boundary, and mixed lubrication and wear, in order to predict accurately the tribological behavior of full-scale mechanical components, which affects the interactions between lubricants and conjugating surfaces under boundary and mixed lubrication conditions. Similarly, interesting is the impact of the chemistry of lubricants and how nano additives affect the interactions between lubricants and conjugating surfaces under boundary and mixed lubrication conditions. This will help to improve lubricant degradation and minimize the operating expenses in automotive applications.
This Research Topic aims to provide and collect recent numerical and experimental studies that address challenges in the development and application of advanced lubricants and their role in enhancing engine performance. Topics include, but are not limited to:
• Lubricants Rheology - Experiments and Analytical Methods
• Molecular Dynamics and Multiscale Modeling
• Friction and Friction Modifiers
• Simulation in Mechanical Components and its Impact with Nanoadditives
• Boundary/Mixed Lubrication
• CO2 and other Pollutant Emissions
• Fuel Efficiency
Keywords: advanced lubricants, engine tribology, bio lubricants, boundary and mixed lubrication, friction modifiers, Zero emissions
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