Investigation of electrostatic charging mechanisms in oil lubricated tribo-contacts

Harvey, Terry J.; Wood, R.J.K.; Denuault, Guy; Powrie, H.E.G.

doi:10.1016/s0301-679x(02)00060-9

Cited by 54 publications

(38 citation statements)

References 21 publications

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“…1987, Трибология… 1993, Morris et al 2002, Harvey et al 2001, Wang et al 2003. This is caused by its sensitiveness to change in high wear mechanisms, and the possibility of receiving information about the kinetics of the destructive processes of contact surfaces.…”

Section: Introductionmentioning

confidence: 99%

Definition of Contact Stress in Friction Units on the Basis of the Acoustic Emission Method

2009

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The following results of acoustic emission signals researches were obtained during the change in contact stress. It is shown that the theoretical regularity of change in average level of the acoustic emission resulting signal at contact stress has a linear character. Analogical regularity is received during experimental researches. It is showed that the sensitivity of the acoustic emission method and the precision of determining contact stresses are considerably better, than the tensometry method. The recording of the moment when friction unit seize begins is also considerably more precise.

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Section: Introductionmentioning

confidence: 99%

Definition of Contact Stress in Friction Units on the Basis of the Acoustic Emission Method

2009

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“…These are largely classified into three kinds of mechanisms, i.e., solid-solid contact [13], solid-liquid contact [14], and electric double layer [15]. However, it is not clear whether, under the present experimental conditions, these tribocharging mechanisms act simultaneously or whether one of these predominates to cause the intense electric fields inside the bubble.…”

Section: Mechanism Of Triboplasma Generation In Oilmentioning

confidence: 99%

Mechanism of Triboplasma Generation in Oil

Nakayama

2010

Tribol Lett

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The triboplasma that had been predicted in the rear clearance space of the sliding contact in oil was discovered by this author, who subsequently proposed that the triboplasma is generated through the discharge of air in the tribocharge electric field in the bubble. The proposed mechanism of triboplasma generation in oil has been studied in terms of the air in the bubble and the dissolved air in oil in the tribosystem of a diamond pin sliding on a sapphire disk in perfluoropolyether oil at atmospheric air pressure and in vacuum. The results of this study show that the triboplasma is not generated without bubble formation even if the oil contains air in the dissolved state. The air bubble grows over the entire gap of the rear divergent clearance space of the sliding contact so that the thickness of the oil film between the air bubble and the solid surfaces is negligibly small and the gap distance at which the triboplasma generation becomes greatest in the oil is the same as that in dry sliding. In other words, triboplasma is generated over the entire rear clearance gap of the sliding contact in the bubble in oil.

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“…The electrostatic (ES) sensing technique has shown promising results when identifying charges associated with surface and lubricant degradation mechanisms, such as contact potential difference (CPD) [17][18][19][20] , triboemission [21][22][23] and debris formation [24,25] , as well as identifying charges associated with the double layer effect [26] (lubricant-surface interaction). ES sensors have also shown to be able to detect bearing failures in advance of vibration monitoring techniques [27][28][29] .…”

Section: Introductionmentioning

confidence: 99%

A study of white etching crack bearing failure detection using electrostatic sensing in wind turbine gearboxes

Esmaeili¹,

Harvey²,

White³

et al. 2018

int j cond monitor

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White etching cracks (WECs) have been found to form in rolling element bearings as early as 6-24 months into operation, especially in large wind turbine gearboxes [1] . [2,3] . [4] . [3] . To investigate the feasibility of WEC detection using the electrostatic (ES) sensing technique, an ES wear site sensor was installed on a bearing test-rig where WECs had been created under the influence of electrical load. The ES responses were compared with those from an acoustic emission (AE) sensor that had been shown to detect WEC failures in a previous study The physical findings related to WEC failures in the bearings and basic analysis of the sensor signals have been reported in a parallel paper by Zuercher et al

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Investigation of electrostatic charging mechanisms in oil lubricated tribo-contacts

Cited by 54 publications

References 21 publications

Definition of Contact Stress in Friction Units on the Basis of the Acoustic Emission Method

Definition of Contact Stress in Friction Units on the Basis of the Acoustic Emission Method

Mechanism of Triboplasma Generation in Oil

A study of white etching crack bearing failure detection using electrostatic sensing in wind turbine gearboxes

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