Passive film thickness control in hydrodynamic lubrication on non-flat surfaces

Nanoimprinting is a manufacturing method to replicate micro- and nanotextures on large-area substrates with ultraviolet-curable resins. Significant potential of large-area nanopatterning lies in its capacity to greatly enhance the performance of an abundance of devices and foster the creation of cutting-edge products. However, current large-area...

Hydrogen absorption and conservation of operational capabilities in remanufactured bearing steel exposed to corrosion

The corrosion of bearing steel often leads to accelerated damage and loss of properties that condition their service life. This damage is further exacerbated with the absorption of hydrogen into the material, generated from corrosion reactions happening at the surface. A remanufacturing process is proposed to recover the operating capabilities...

Damage assessment of highly-loaded low-speed roller bearings with acoustic emission monitoring: A full-scale laboratory evaluation

Highly-loaded low-speed roller bearings are frequently used in equipment offshore e.g. slew bearings in crane, sheave bearings and FPSO turret bearings. Reducing maintenance costs, increasing productivity, ensuring safety of people and structural integrity and longevity assurance of equipment can be achieved by the condition monitoring of highly...

Monitoring strain in rolling element bearings using fiber Bragg grating sensors

Using Fiber Bragg Grating (FBG) sensors in rolling element bearings is a novel way of monitoring bearings. During prototype testing, differences between sensor readouts were observed, leading to the research question: “What causes the observed differences in the strain distribution from sensor to sensor in a rolling element bearing equipped with...

Validation of the in-plane friction behaviour of a ferrofluid bearing

The repeatability of precision positioning systems can be improved by reducing the effects of stick-slip in the system. Stick-slip effects introduce a spontaneous jerking motion when overcoming the static friction coefficient, creating accelerations that are hard to predict. Contactless bearing types, such as magnetic levitation or fluid...

Traffic induced bearing loads and movements of a steel plate-girder bridge.

Structural bearings in bridges are subjected to loads and movements, causing wear of bearing components as PTFE-sheets, guides and internal seals. Nowadays, these components are tested for durability according to EN 1337. The parameters and procedures in these tests are questioned and, therefore, investigated in an existing plate-girder bridge...