Research and analysis od the defects of operational the rolling bearings based on the use of lubricants (original) (raw)

Investigation of rolling bearing lubrication condition

Diagnostyka

The research aimed to assess the lubrication condition of rolling bearings dismounted from previously operated passenger car alternators. The tests measured the vibrations and evaluated the technical condition of the bearings based on selected estimators of the vibration acceleration signal subjected to earlier band-pass filtration in the high-frequency range of 8-10kHz. Next, the bearings have been disassembled, allowing inspection of the lubricant condition for each measured bearings and the visual assessment of individual components. Based on the test results, it was observed that the mean value and standard deviation of considered features of vibration acceleration signals in the 8-10kHz band might be helpful in the classification of the lubrication condition.

Experimental Analysis of Vibration of Ball Bearing Considering Solid Contaminants in Lubricants

2013

Rolling element bearings are common in any rotating machinery. The rolling element bearings subjected to failure under continuous running. Therefore they have received great attention in the field of condition monitoring. Different methods are detection and diagnosis of the bearing defects. Among them the commonly used technique is vibration signature analysis. The information obtained from the system vibration can be used for identifying its response subjected to various conditions. In rolling element bearing, contamination of lubricant grease by solid particles is one among the several reasons for early bearing failure. The main objective of this project is to investigate the effect of lubricant contamination by solid particles on rolling element bearing. This work is carried out to determine the vibrations on good and defective bearing in healthy grease and contaminant grease conditions. Obtained the vibration characteristics of healthy grease tested ball bearings are compared wi...

Experimental Investigations on Interaction Effect of Lubrication and Vibration in Bearings

Bearings are amongst the frequently used components to be found in rotating machinery. Though inexpensive, their failure can interrupt the production in a plant causing unscheduled downtime and production losses. Many works are found in literature for bearings running under grease lubrication. There is no much importance given for bearings with liquid lubricants. This work intends to illustrate vibration behavior of roller bearings as a function of lubricant viscosity. Experimental tests were conducted in roller bearings, lubricated with mineral oil of three different viscosity grades (ISO 10, 32 and 68) under different loads and shaft speeds. The rms of vibration is determined through the processing and analysis of bearing radial vibration data. This is obtained for each of the conditions, during one hour test run for temperature stabilization. From root mean square (RMS) analysis of the vibration signals, it is identified that specific RMS change caused by the change in lubricant viscosity, which was related to change in oil film thickness. This study predicts that a ball bearing running with oil lubrication shows a better performance with high viscosity oil which reduces the average vibration level as well as increases in minimum oil flim thickness. Keywords: Lubrication, Roller bearing, Vibration, Viscosity

Vibration Studies on Ball Bearing Considering Solid Contaminants In Lubricants

2016

Rolling element bearings are common in any rotating machinery. The rolling element bearings subjected to failure under continuous running. Therefore they have received great attention in the field of condition monitoring. Different methods are detection and diagnosis of the bearing defects. Among them the commonly used technique is vibration signature analysis. The information obtained from the system vibration can be used for identifying its response subjected to various conditions. In rolling element bearing, contamination of lubricant grease by solid particles is one among the several reasons for early bearing failure. The main objective of this project is to investigate the effect of lubricant contamination by solid particles on rolling element bearing. This work is carried out to determine the vibrations on good and defective bearing in healthy grease and contaminant grease conditions. Obtained the vibration characteristics of healthy grease tested ball bearings are compared wi...

Condition monitoring studies on ball bearings considering solid contaminants in the lubricant

Proceedings of the Institution of …, 2010

Rolling element bearings are common in any rotating machinery. They are subject to failure under continuous running. Therefore they have received a great deal of attention in the field of condition monitoring. In rolling element bearings, contamination of lubricant grease by solid particles is one of the several reasons for an early bearing failure. In this context, this article investigates the effect of contamination of lubricant by solid particles on the dynamic behaviour of rolling bearings. Silica powder at three concentration levels and different particle sizes was used to contaminate the lubricant. Experimental tests have been performed on the ball bearings lubricated with grease, and the trends in the amount of vibration affected by the contamination of the grease were determined. The contaminant concentration as well as the particle size is varied. Vibration signatures were analysed in terms of root mean square (RMS) values. From the results, some fruitful conclusions are made about the bearing performance. The effects of contaminant and the bearing vibration are studied for both good and defective bearings. The results show significant variation in the RMS velocity values on varying the contaminant concentration and particle size.

A Tribological Study of Effect of Lubricants and Lubrication Mechanisms in Rolling Process: A Review

INTERNATIONAL JOURNAL OF ADVANCED PRODUCTION AND INDUSTRIAL ENGINEERING, 2020

The rolling process had been used in every aspect of our life. Various types of sections like tee, angle, channel, railway track, sheets, foils of different mate-rial are made by rolling process. The quality of the product depends upon the various characteristics of rolling parameters. At the junction, the key role played by lubricants for saving energy and properties of the material in contact. Re-searchers are putting continuous efforts into the tribological analysis and developing new lubricants for the rolling process according to the material. The authors had reviewed the lubricants used in different rolling processes and found out a diverse range of lubricants. Various ecologically safe and effective lubricants had been reviewed. Lubrication performance testing tribometer for testing of tribological properties of lubricants had been reviewed. Hydrodynamic, mixed and boundary lubrication mechanisms had been found in different rolling conditions. The use of lubricants was found ...

Analysis of Effect of Solid Contaminant in Lubrication on Vibration Response of Ball Bearing

2017

In ball bearings, contamination of lubricant by solid particles is the major reason of early bearing failure. To deal with this problem, a noninvasive technique like vibration measurement is used for monitoring the performance of machines. In this paper, Present work investigates the effect of lubricant contamination by solid particles of Limestone on the dynamic behaviour of rolling bearing, to determine the trends in the vibrations of the bearing. Experimental investigations are made with deep groove ball bearings lubricated with contaminated and healthy grease. Limestone in three concentration levels and three-grain sizes are used to contaminate the grease. Vibrations generated by bearing due to contaminants in lubricant are analysed in the terms of the root mean square (RMS) and peak amplitude values by using FFT analyzer. The effects of contaminant on bearing vibration are studied for both good and defective bearings. The results show significant vibration in RMS velocity value...

Study of Effect of Solid Contaminants in the Lubricant on Ball Bearings Vibration

International Journal of Instrumentation Control and Automation, 2012

In deep groove ball bearings contamination of lubricant grease by solid particles is one of the main reason for early bearing failure. To deal with such problem, it is fundamental not only the use of reliable techniques concerning detection of solid contamination but also the investigation of the effects of certain contaminant characteristics on bearing performance. Nowadays the techniques such as vibration measurements are being increasingly used for on-time monitoring of machinery performance. The present work investigates the effect of lubricant contamination by solid particles on the dynamic behavior of rolling bearings, in order to determine the trends in the amounts of vibration affected by contamination in the Grease and by the bearing wear itself. Experimental tests are performed with Deep-groove ball bearings. The Dolomite powder in three concentration levels and different particle sizes was used to contaminate the grease. Vibration signals were analyzed in terms of Root Me...

A study of rolling bearing fatigue life with mineral oil lubrication

Wear, 1972

Tests on mineral oil lubricated deep groove ball bearings show that there is an optimum lubricant viscosity to ensure maximum rolling contact fatigue life. The results are explained by lubricant film thickness measurements and the application of E.H.L. theory. The optimum lubricant viscosity increases with increase of load and decreases with reduction of speed.