Lubrication Condition Monitoring of Practical Ball Bearings by Electrical Impedance Method

In this study, the electrical impedance method was developed to monitor the thickness and breakdown ratio of oil films in elliptical elastohydrodynamic (EHD) contacts of practical ball bearings. First, it is theoretically shown that the oil film thickness and breakdown ratio can be simultaneously me...

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Autores principales:	Taisuke Maruyama, Masayuki Maeda, Ken Nakano
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2019
Materias:	electrical impedance method condition monitoring oil film thickness breakdown ratio elastohydrodynamic lubrication ball bearing Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/17e0c8a060cb43218cd5107093a8d7b6
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spelling	oai:doaj.org-article:17e0c8a060cb43218cd5107093a8d7b62021-11-05T09:17:25ZLubrication Condition Monitoring of Practical Ball Bearings by Electrical Impedance Method1881-219810.2474/trol.14.327https://doaj.org/article/17e0c8a060cb43218cd5107093a8d7b62019-12-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/14/5/14_327/_pdf/-char/enhttps://doaj.org/toc/1881-2198In this study, the electrical impedance method was developed to monitor the thickness and breakdown ratio of oil films in elliptical elastohydrodynamic (EHD) contacts of practical ball bearings. First, it is theoretically shown that the oil film thickness and breakdown ratio can be simultaneously measured from the complex impedance generated when a sinusoidal voltage is applied to elliptical contacts. Subsequently, lubrication conditions of practical ball bearings were monitored at an ambient temperature to verify the measurement accuracy of the developed method. The oil film thickness in the low-speed range was consistent with the theoretical value calculated by Hamrock–Dowson equation. However, in the high-speed range, the oil film was thinner than the theoretical value considered an ambient temperature. In this high-speed range, the results of both the outer ring temperature and bearing torque revealed that the viscous shear heating and starvation were occurring simultaneously, thus supporting that the measured thickness would be thinner than the theoretical value. Besides, the developed method can also measure the breakdown ratio, confirming that it increases in the low-speed range where the bearing torque increases. That is, it indicates that not only the oil film thickness but also the breakdown ratio can be evaluated quantitatively.Taisuke MaruyamaMasayuki MaedaKen NakanoJapanese Society of Tribologistsarticleelectrical impedance methodcondition monitoringoil film thicknessbreakdown ratioelastohydrodynamic lubricationball bearingPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 14, Iss 5, Pp 327-338 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	electrical impedance method condition monitoring oil film thickness breakdown ratio elastohydrodynamic lubrication ball bearing Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	electrical impedance method condition monitoring oil film thickness breakdown ratio elastohydrodynamic lubrication ball bearing Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Taisuke Maruyama Masayuki Maeda Ken Nakano Lubrication Condition Monitoring of Practical Ball Bearings by Electrical Impedance Method
description	In this study, the electrical impedance method was developed to monitor the thickness and breakdown ratio of oil films in elliptical elastohydrodynamic (EHD) contacts of practical ball bearings. First, it is theoretically shown that the oil film thickness and breakdown ratio can be simultaneously measured from the complex impedance generated when a sinusoidal voltage is applied to elliptical contacts. Subsequently, lubrication conditions of practical ball bearings were monitored at an ambient temperature to verify the measurement accuracy of the developed method. The oil film thickness in the low-speed range was consistent with the theoretical value calculated by Hamrock–Dowson equation. However, in the high-speed range, the oil film was thinner than the theoretical value considered an ambient temperature. In this high-speed range, the results of both the outer ring temperature and bearing torque revealed that the viscous shear heating and starvation were occurring simultaneously, thus supporting that the measured thickness would be thinner than the theoretical value. Besides, the developed method can also measure the breakdown ratio, confirming that it increases in the low-speed range where the bearing torque increases. That is, it indicates that not only the oil film thickness but also the breakdown ratio can be evaluated quantitatively.
format	article
author	Taisuke Maruyama Masayuki Maeda Ken Nakano
author_facet	Taisuke Maruyama Masayuki Maeda Ken Nakano
author_sort	Taisuke Maruyama
title	Lubrication Condition Monitoring of Practical Ball Bearings by Electrical Impedance Method
title_short	Lubrication Condition Monitoring of Practical Ball Bearings by Electrical Impedance Method
title_full	Lubrication Condition Monitoring of Practical Ball Bearings by Electrical Impedance Method
title_fullStr	Lubrication Condition Monitoring of Practical Ball Bearings by Electrical Impedance Method
title_full_unstemmed	Lubrication Condition Monitoring of Practical Ball Bearings by Electrical Impedance Method
title_sort	lubrication condition monitoring of practical ball bearings by electrical impedance method
publisher	Japanese Society of Tribologists
publishDate	2019
url	https://doaj.org/article/17e0c8a060cb43218cd5107093a8d7b6
work_keys_str_mv	AT taisukemaruyama lubricationconditionmonitoringofpracticalballbearingsbyelectricalimpedancemethod AT masayukimaeda lubricationconditionmonitoringofpracticalballbearingsbyelectricalimpedancemethod AT kennakano lubricationconditionmonitoringofpracticalballbearingsbyelectricalimpedancemethod
_version_	1718444393828974592

Lubrication Condition Monitoring of Practical Ball Bearings by Electrical Impedance Method

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