Francisco Gerardo Antonio Gutierrez Guzman
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View article: New White Etch Cracking resistant martensitic stainless steel for bearing applications by high temperature solution nitriding
New White Etch Cracking resistant martensitic stainless steel for bearing applications by high temperature solution nitriding Open
White Etch Cracking (WEC) is a severe and unpredictable failure mode that has been frequently observed in, among others, bearings for wind energy applications. In this work a novel, patented, WEC resistant bearing steel solution is develop…
View article: Evaluation of Wear Models for the Wear Calculation of Journal Bearings for Planetary Gears in Wind Turbines
Evaluation of Wear Models for the Wear Calculation of Journal Bearings for Planetary Gears in Wind Turbines Open
To increase the power density of the electromechanical drive train of wind turbines, journal bearings can be used as planetary gear bearings instead of rolling bearings. This technological change presents new challenges. For example, wind …
View article: Evaluation of Wear Models for the Wear Calculation of Journal Bearings for Planetary Gears in Wind Turbines
Evaluation of Wear Models for the Wear Calculation of Journal Bearings for Planetary Gears in Wind Turbines Open
To increase the power density of the electromechanical drive train of wind turbines, journal bearings can be used as planetary gear bearings instead of rolling bearings. This technological change presents new challenges. For example, wind …
View article: Simulation methodology for the identification of critical operating conditions of planetary journal bearings in wind turbines
Simulation methodology for the identification of critical operating conditions of planetary journal bearings in wind turbines Open
The usage of journal bearings as planetary bearings in wind turbines instead of roller bearings has become more common in recent years. Their usage is advantageous, due to smaller installation space needed compared to roller bearings allow…
View article: Sensor integrating plain bearings: design of an energy-autonomous, temperature-based condition monitoring system
Sensor integrating plain bearings: design of an energy-autonomous, temperature-based condition monitoring system Open
Plain bearings are increasingly being used under mixed friction, resulting in a higher risk of wear-induced failure. Therefore, the relevance of condition monitoring is increasing, which can enable the early detection of wear inducing cond…
View article: Electrical Bearing Damage, A Problem in the Nano- and Macro-Range
Electrical Bearing Damage, A Problem in the Nano- and Macro-Range Open
Rolling bearings face different damaging effects: Besides mechanical effects, current-induced bearing damage occurs in electrical drive systems. Therefore, it is of increasing interest to understand the differences leading to known electri…
View article: Wind turbine drivetrains: state-of-the-art technologies and future development trends
Wind turbine drivetrains: state-of-the-art technologies and future development trends Open
This paper presents the state-of-the-art technologies and development trends of wind turbine drivetrains – the system that converts kinetic energy of the wind to electrical energy – in different stages of their life cycle: design, manufact…
View article: Accelerated White Etch Cracking (WEC) FE8 type tests of different bearing steels using ceramic rollers
Accelerated White Etch Cracking (WEC) FE8 type tests of different bearing steels using ceramic rollers Open
White Etch Cracking (WEC) is a severe and unpredictable failure mode affecting bearings in various industrial sectors. In this work, accelerated WEC laboratory tests have been performed using FE8 type test rigs with ceramic rollers to test…
View article: Wind turbine drivetrains: state-of-the-art technologies and future development trends
Wind turbine drivetrains: state-of-the-art technologies and future development trends Open
This paper presents the state-of-the-art technologies and development trends of wind turbine drivetrains – the energy conversion systems transferring the kinetic energy of the wind to electrical energy – in different stages of their life c…
View article: Condition monitoring of roller bearings using acoustic emission
Condition monitoring of roller bearings using acoustic emission Open
Roller bearing failures in wind turbines' gearboxes lead to long downtimes and high repair costs, which could be reduced by the implementation of a predictive maintenance strategy. In this paper and within this context, an acoustic-emissio…
View article: Post-testing measurement of freely movable and diffusible hydrogen in context of WEC formation at cylindrical roller thrust bearings from 100Cr6
Post-testing measurement of freely movable and diffusible hydrogen in context of WEC formation at cylindrical roller thrust bearings from 100Cr6 Open
Sub-surface crack networks in areas of altered microstructure are a common cause for bearing failures. Due to its appearance under light microscopy, the damage pattern is referred to as White Etching Cracks (WEC). The root causes leading t…
View article: Condition Monitoring of roller bearings using Acoustic Emission
Condition Monitoring of roller bearings using Acoustic Emission Open
Roller bearing failures in wind turbines gearboxes lead to long downtimes and high repairing costs, which could be reduced by the implementation of a predictive maintenance strategy. In this paper and within this context an acoustic emissi…
View article: Influence of Slip and Lubrication Regime on the Formation of White Etching Cracks on a Two-Disc Test Rig
Influence of Slip and Lubrication Regime on the Formation of White Etching Cracks on a Two-Disc Test Rig Open
A common cause for maintenance and downtime in multiple fields of the mechanical transmission industries are premature rolling bearing failures due to white etching cracks (WEC). Within this work, WEC have been successfully recreated on a …