Surface Degradation Analysis Of Roller Bearing

Surface degradation analysis and defects detection of roller bearing are crucial for the prediction of the impending failure in machineries. In this work, two conditions of grease lubrication and unlubricated condition are investigated. The analysis is focused on the surface degradation of the in...

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Main Author:	Yusof, Nurul Farhana Mohd
Format:	Thesis
Language:	English
Published:	2012
Subjects:	TJ1 Mechanical engineering and machinery
Online Access:	http://eprints.usm.my/46296/1/NURUL%20FARHANA%20BINTI%20MOHD%20YUSOF_HJ.pdf
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spelling	my-usm-ep.462962020-02-20T07:17:40Z Surface Degradation Analysis Of Roller Bearing 2012-01 Yusof, Nurul Farhana Mohd TJ1 Mechanical engineering and machinery Surface degradation analysis and defects detection of roller bearing are crucial for the prediction of the impending failure in machineries. In this work, two conditions of grease lubrication and unlubricated condition are investigated. The analysis is focused on the surface degradation of the inner race and the rolling element since these surfaces suffer from the higher contact stress level. The natural surface degradation of the roller bearing is monitored from the beginning of the experiment until damage. The lubrication film thickness is determined by the Hamrock-Dowson equation which showed that the grease lubricated bearing operated under the elastrohydrodynamic lubrication, with the ratio of lubrication film thickness to the surface roughness of λ in the range of 0.9 to 3.65. The unlubricated bearing was damaged after 20 minutes whereas the grease lubricated bearing continued to operate for 6600 minutes. The observation under microscope showed that the surface underwent smoothening process where the surface roughness decreases during the running-in state with the λ = 3.65 to 2.3 followed by roughening at the steady state where the surface roughness increases, with λ = 2.3 to 0.9. At damage, the value of λ = 0.9 can be associated with the high level of the bearing vibration. The increase of vibration level becomes rapid at the critical value of λ = 1.6. As such the overall vibration level of the bearing can be related to the surface degradation. For unlubricated condition, these processes took place faster. Both waviness and roundness measurement showed higher form change of the inner race. Envelope analysis at the end of experiment showed that the bearing damaged can be traced at the inner race with the clear peak of the inner race bearing defect frequency. 2012-01 Thesis http://eprints.usm.my/46296/ http://eprints.usm.my/46296/1/NURUL%20FARHANA%20BINTI%20MOHD%20YUSOF_HJ.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Mekanikal
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	TJ1 Mechanical engineering and machinery
spellingShingle	TJ1 Mechanical engineering and machinery Yusof, Nurul Farhana Mohd Surface Degradation Analysis Of Roller Bearing
description	Surface degradation analysis and defects detection of roller bearing are crucial for the prediction of the impending failure in machineries. In this work, two conditions of grease lubrication and unlubricated condition are investigated. The analysis is focused on the surface degradation of the inner race and the rolling element since these surfaces suffer from the higher contact stress level. The natural surface degradation of the roller bearing is monitored from the beginning of the experiment until damage. The lubrication film thickness is determined by the Hamrock-Dowson equation which showed that the grease lubricated bearing operated under the elastrohydrodynamic lubrication, with the ratio of lubrication film thickness to the surface roughness of λ in the range of 0.9 to 3.65. The unlubricated bearing was damaged after 20 minutes whereas the grease lubricated bearing continued to operate for 6600 minutes. The observation under microscope showed that the surface underwent smoothening process where the surface roughness decreases during the running-in state with the λ = 3.65 to 2.3 followed by roughening at the steady state where the surface roughness increases, with λ = 2.3 to 0.9. At damage, the value of λ = 0.9 can be associated with the high level of the bearing vibration. The increase of vibration level becomes rapid at the critical value of λ = 1.6. As such the overall vibration level of the bearing can be related to the surface degradation. For unlubricated condition, these processes took place faster. Both waviness and roundness measurement showed higher form change of the inner race. Envelope analysis at the end of experiment showed that the bearing damaged can be traced at the inner race with the clear peak of the inner race bearing defect frequency.
format	Thesis
qualification_level	Master's degree
author	Yusof, Nurul Farhana Mohd
author_facet	Yusof, Nurul Farhana Mohd
author_sort	Yusof, Nurul Farhana Mohd
title	Surface Degradation Analysis Of Roller Bearing
title_short	Surface Degradation Analysis Of Roller Bearing
title_full	Surface Degradation Analysis Of Roller Bearing
title_fullStr	Surface Degradation Analysis Of Roller Bearing
title_full_unstemmed	Surface Degradation Analysis Of Roller Bearing
title_sort	surface degradation analysis of roller bearing
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Mekanikal
publishDate	2012
url	http://eprints.usm.my/46296/1/NURUL%20FARHANA%20BINTI%20MOHD%20YUSOF_HJ.pdf
_version_	1747821647065251840

Surface Degradation Analysis Of Roller Bearing

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