Wiki Tag: PSD

power spectral density of a rough surface

Power Spectral Density of Rough Surfaces

26.08.2018 tribonet

Roughness is known to be an important factor in friction, wear and related performance of the machine parts. It was shown recently that Power Spectrum Density (PSD) can be used as a metric to describe […]

Benefits of Hybrid Bearings in Severe Conditions

03.07.2017

Hybrid bearings, i.e., bearings with steel rings and bearing grade silicon nitride (Si3N4) rolling elements, have been increasingly used in applications operating in challenging environments [1-4] such as high-speed, oil-free air conditioning and refrigeration compressors, [...]
Impact of water on Grease film thickness in rolling point contacts

26.02.2017

In a rolling bearing, the load transmission is often accompanied by high contact stresses which may eventually lead to wear and/or fatigue. In order to ensure separation of moving parts leading to a long life, [...]
Slip, No Slip and Cavitation

05.09.2016

Engineering surfaces are heterogeneous and can be slippery or sticky locally depending on surface roughness and chemistry. The variation of surface properties affects the interaction between the wall and lubricant and determines friction. Slip can [...]
Tribology in Animal World: Dietary Habits of Lepidosauria Studied via Dental Microwear

07.10.2019

Scientists from the Johannes Gutenberg University Mainz are studying the tooth enamel surface of lepidosauria. Lepidosauria are reptiles with overlapping scales and include approximately 7150 species of lizards, snakes, tuatara and amphisbaenians (worm lizards). The [...]
Materials researchers study the causes of wear – permanent molecular modifications occur at first contact

11.10.2018

Wear has major impacts on economic efficiency or health. All movable parts are affected, examples being the bearing of a wind power plant or an artificial hip joint. However, the exact cause of wear is [...]