Capacitance calculation of unloaded rolling elements – Comparison of analytical and numerical methods

Puchtler, Steffen; Schirra, Tobias; Kirchner, Eckhard; Späck-Leigsnering, Y.; Gersem, Herbert De

doi:10.1016/j.triboint.2022.107882

Cited by 10 publications

(9 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, the capacitance of each contact can be calculated using a semi-analytic approach, introduced by the authors in [25]. First, the capacitance C Hz of the Hertz'ian area A Hz (18)…”

Section: Capacitance Calculationmentioning

confidence: 99%

Analyzing Ball Bearing Capacitance Using Single Steel Ball Bearings

2023

Self Cite

View full text Add to dashboard Cite

A precise modeling of the capacitance of rolling element bearings is of increasing significance over the last years, e.g. in the context of bearing damage estimation in electric drives. The complexity of a steel bearing as an electrical network makes reliable validation of calculation models under realistic operating conditions nearly impossible. A way to reduce complexity in yet realistic conditions is the use of hybrid bearings with a single steel rolling element. This helps to measure only one current path through the bearing at a time and thus, gives a much clearer picture of the contact capacitance of rolling elements in and out of the load zone. The usage of different materials comes with different thermal expansion coefficients and different elasticities, which cause a significant change in load distribution. For the first time, this work considers both of these effects in calculation and validates them with corresponding experiments using single steel ball bearings.

show abstract

“…Finally, the capacitance of each contact can be calculated using a semi-analytic approach, introduced by the authors in [25]. First, the capacitance C Hz of the Hertz'ian area A Hz (18)…”

Section: Capacitance Calculationmentioning

confidence: 99%

Analyzing Ball Bearing Capacitance Using Single Steel Ball Bearings

2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…Approaches to model the electrical behavior of rolling bearings have existed for several years. One of the first analytical models was described by Prashad in 1988 [15], for example, and later developed further semi-analytically by Puchtler [16] and Schneider [17]. These description models have analytical or empirical conditions in common, such as an ideal surface of the contact partners or a purely radial load on the contact.…”

Section: Analytical and Numerical Modelsmentioning

confidence: 99%

Pitting Influence on Electrical Capacitance in EHL Rolling Contacts

Zaiat,

Ibrahim,

Kirchner

2023

Lubricants

Self Cite

View full text Add to dashboard Cite

This work presents an investigation on the influence of pitting in EHL rolling contact. The pitting geometry comes as an extension on the architecture for multi-physical numerical calculations of rolling element bearing contacts based on OpenFOAM. The model utilized is built according to the state-of-the-art for fluid–solid interaction and electro-quasi-static fields. In this framework, the contact is reduced to be two dimensional in order to reduce the computing costs needed. The changes in the electric properties, which are caused by pittings, are measured using the electric capacitance of the contact and put in perspective with regard to the EHL contacts geometry. The investigation delivers an evaluation on how surface degradation, in both the pitting width w and pitting depth d of the contact, affects the electric properties. It can be seen that the maximum deviations with different reduced radii for the same pitting structures are around 5% and would therefore hardly be distinguishable with corresponding measurements. By comparing the same data for the same ratio of pitting width to reduced radius, on the other hand, differences of up to 50% can be seen.

show abstract

“…Approaches to model the electrical behaviour of rolling bearings have existed for several years. One of the first analytical models were described by Prashad in 1988 [12], for example, and later developed further semi-analytically by Schirra [13,14], and Puchtler [15]. These description models have analytical or empirical conditions in common, such as an ideal surface of the contact partners or a purely radial load on the contact.…”

Section: Analytical and Numerical Modelsmentioning

confidence: 99%

Pitting Influence on Electrical Capacitance in EHL Rolling Contacts

Zaiat

Ibrahim

Kirchner

2023

Preprint

View full text Add to dashboard Cite

This work presents an investigation on the influence of pitting in EHL rolling contact. The pit-ting geometry comes as an extension on the architecture for multi-physical numerical calculations ofrolling element bearing contacts based on OpenFOAM. The model utilized is built according to thestate-of-the-art for fluid-solid interaction and electro-quasi-static fields. In this framework, the con-tact is reduced to be two dimensional in order to reduce the computing costs needed. The changesin the electric properties, that are caused by pittings, are measured using the electric capacitanceof the contact and put in perspective to the EHL contacts geometry. The investigation deliversan evaluation on how surface degradation, in both the pitting width w and pitting depth d ofthe contact, affects the electric properties. It can be seen that the electrical capacitance changeof different initial geometries has different gradients; both in terms of absolute pitting geometrieslike pitting width w and pitting depth d and relative compared to the reduced radius w/Rr.

show abstract

Capacitance calculation of unloaded rolling elements – Comparison of analytical and numerical methods

Cited by 10 publications

References 20 publications

Analyzing Ball Bearing Capacitance Using Single Steel Ball Bearings

Analyzing Ball Bearing Capacitance Using Single Steel Ball Bearings

Pitting Influence on Electrical Capacitance in EHL Rolling Contacts

Pitting Influence on Electrical Capacitance in EHL Rolling Contacts

Contact Info

Product

Resources

About