Condition monitoring studies on ball bearings considering solid contaminants in the lubricant (original) (raw)
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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...
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...
Study of solid contamination in ball bearings through vibration and wear analyses
Tribology International, 2007
In rolling bearings, contamination of lubricant oil by solid particles is one of the main reasons for early bearing failure. In order to deal with this 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, non-invasive techniques, such as vibration measurements, are being increasingly used for on-time monitoring of machinery performance. In this context, the present work investigates the effect of lubricant contamination by solid particles on the dynamical behavior of rolling bearings, in order to determine the trends in the amounts of vibration affected by contamination in the oil and by the bearing wear itself. Experimental tests were performed with radial ball bearings lubricated by oil bath. Quartz powder in three concentration levels and different particle sizes was used to contaminate the oil. Vibration signals were analyzed in terms of the root mean square (rms) values. The results show that changes in the rms values of vibration in the high-frequency band, from 600 to 10,000 Hz, were associated to the changes in oil lubrication in the bearing contacts, caused by oil contamination and wear damage on the bearing surfaces. r
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...
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...
2005
The work aims to present results from experimental studies on the detection of contamination by solid particulate in the lubricant oil of rolling bearings, through vibration signature analyses. Comparisons between data from clean and contaminated oil tests are presented. The experimental tests were performed with pure mineral, ISO 32 viscosity oil. The oils were contaminated with quartz particulate in several concentration levels, ranging from 0.04 to 0.7 g/l. All the vibration data were acquired from an accelerometer and the signal processing was performed through power spectrum density and RMS value calculations. The results show possibility of identifying the presence of contamination from some specific frequency bands of the vibration signal. Re-testing the rolling bearings with clean oil revealed that some frequency bands are excited due to wear in the contacting elements.
Engineering Failure Analysis, 2014
Ball bearings' rating life is reduced when they are installed, operated and maintained under harsh environmental conditions as they suffer from excessive wear due to debris contaminants in the lubricant. This life reduction is taken into account when calculating the modified rating life but the impact of contaminant's variables such as size, hardness and concentration level are not determined in detail. In this work, greases contaminated with particles of different sizes and hardness (steel and corundum) are tested to shed new light in the way these parameters and wear's progress are related. A test rig is utilized and the most recent methods on vibration analysis regarding bearings' condition and estimated residual life are assessed and evaluated. At the end of the tests, optical inspections using a stereoscope verify the vibration analyses results. It can be concluded that wear is more severe when harder particles are used, but regarding their size, it seems that wear progresses in a different manner depending on particle's hardness and brittleness as soft ductile particles are rolled over and hard brittle particles are crushed down.
Materials Today: Proceedings, 2017
Rolling element bearings are common in rotating machinery, automobiles and aerospace etc. For friction less and continuous running, bearing is lubricated with grease. Greases are contaminated with solid particles and liquids. This is one of the main reason for bearing failure, here we analyze and study the effect of liquid contaminant in lubrication on vibration response. It is difficult, but not impossible, to study the ingress of liquid (water) into bearings. Water is contaminated/ entrapped in various forms like rain water, soapy water, salt water and municipal cor. water etc. These water is contaminated with greases due to rain, human error, experiment etc. The ability of a lubricating grease to withstand, reject or absorb water is different for different greases. Hence we investigate the effect of liquid contamination of lubricant on the behaviour of rolling bearings. Bearing with contaminants are subject to failure under continuous running, so there Liquid contaminate such as water with salt, soap solution at different concentration level and rain water is used to contaminate the lubricant. An experimental test is to be performed on the ball bearings and the trends in the amount of vibration affected by the contamination of the grease determined. Vibration signatures were analyzed with respect to root mean square (RMS) values of amplitude in terms of acceleration and also with respect to acceleration values at particular defect frequencies. In rolling bearings, a sudden increase in vibration can be indicative of failure occurrence.
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
The Impact of Particle Contaminants' Hardness on the Wear Mechanism of Rolling Element Bearings
The rating life of ball bearings is reduced when hard particle contaminants are present in the lubricant. Usually, this life reduction is taken into account in the calculation of modified rating life by using the contamination factor through a general characterization of the lubrication conditions. However, the impact of contaminant's variables such as size, hardness and concentration level should be specified in detail. In this work, greases contaminated with steel and alumina particles of the same size are tested with the purpose of finding examining the wear mechanism and its progress inside the bearings. A laboratory rig is utilized for these tests and vibration analysis is performed to estimate the condition and the residual life of the bearings. After the tests, optical inspections performed in a stereoscope verify the predictions of vibration analyses and give a graphical point of the wear. It was found that steel particles, after their initial deformation, produce milder...