Method for in situ film thickness measurement of ball bearings under combined loading using capacitance measurements

Schneider, Volker; Bader, Norbert; Liu, Haichao; Poll, Gerhard

doi:10.1016/j.triboint.2022.107524

Cited by 27 publications

(15 citation statements)

References 13 publications

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“…Currently, capacitance measurement methods are divided into two categories: calculating the Hertz area capacitance constant and calibration testing (Cen et al, 2021). By calculating the Hertz contact coefficient, the oil film capacitance can be determined to calculate bearing oil film thickness (Schneider et al, 2022). When using the capacitance method to measure the oil film, different lubricants have varying effects on capacitance, and thus, the measurement results are influenced by the type of lubricant used (Jablonka et al, 2013).…”

Section: Capacitance Measurement Methodsmentioning

confidence: 99%

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A comprehensive review of non-destructive methods for bearing lubricating oil film thickness measurement

Shang,

Sun,

Cai

2024

ILT

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Purpose The purpose of this study is to investigate the application of non-destructive testing methods in measuring bearing oil film thickness to ensure that bearings are in a normal lubrication state. The oil film thickness is a crucial parameter reflecting the lubrication status of bearings, directly influencing the operational state of bearing transmission systems. However, it is challenging to accurately measure the oil film thickness under traditional disassembly conditions due to factors such as bearing structure and working conditions. Therefore, there is an urgent need for a nondestructive testing method to measure the oil film thickness and its status. Design/methodology/approach This paper introduces methods for optically, electrically and acoustically measuring the oil film thickness and status of bearings. It discusses the adaptability and measurement accuracy of different bearing oil film measurement methods and the impact of varying measurement conditions on accuracy. In addition, it compares the application scenarios of other techniques and the influence of the environment on detection results. Findings Ultrasonic measurement stands out due to its widespread adaptability, making it suitable for oil film thickness detection in various states and monitoring continuous changes in oil film thickness. Different methods can be selected depending on the measurement environment to compensate for measurement accuracy and enhance detection effectiveness. Originality/value This paper reviews the basic principles and latest applications of optical, electrical and acoustic measurement of oil film thickness and status. It analyzes applicable measurement methods for oil film under different conditions. It discusses the future trends of detection methods, providing possible solutions for bearing oil film thickness detection in complex engineering environments.

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Section: Capacitance Measurement Methodsmentioning

confidence: 99%

“…The linear ultrasonic reflection model (Shang and Zhang, 2022) is a commonly used model for analyzing the measurement of the thickness of bearing oil film. Different ultrasonic reflection coefficients can be obtained using a single model or a combination of multiple models to analyze the reflected sound waves.…”

Section: Acoustic Modelsmentioning

confidence: 99%

A comprehensive review of non-destructive methods for bearing lubricating oil film thickness measurement

Shang,

Sun,

Cai

2024

ILT

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“…The technology is not yet ready for the market but promising studies in the field of metal cold rolling 4 suggest that it soon can be. Further, capacitive sensors can be used, as recently demonstrated for the film thickness of lubricants in ball bearings 5 . Also, X-ray sensors should be mentioned which are commonly in use for surface analysis and widely applicable [6][7][8] but limited in penetration depth by the mean free electron path of the investigated solid material.…”

Section: Detection Methods For Functional Coatingsmentioning

confidence: 99%

In-line fluorescence detector for production control in robot-driven environments

Behrendt

Adolph

Lutz

et al. 2023

Optical Measurement Systems for Industrial Inspection XIII

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Fluorescence imaging is a powerful tool to detect the presence of processing agents, e.g., oils, lubricants, and organic coatings on metal surfaces. This imaging technique can be used in production e. g., to determine the oil coverage on sheet metal to assure the best forming results or for inspecting the cleanliness of components before further processing like gluing, welding, coating, etc. The presented sensor is an evolution of the existing fluorescence laser scanner (F-Scanner) system 1 and is optimized for measurement in motion. Adding this additional degree of freedom by mounting the scanner on a robot or gantry enables complete scans of large and complex shaped parts as well as selected areas that require special care, e.g., an increased level of cleanliness. The F-Scanner system has been improved in terms of footprint, weight, durability, and robustness. It can be operated with lightweight industrial robots and even cobots. In situations where ambient light makes fluorescence imaging challenging, a fast Fourier transform (FFT) based technique is used to ensure unperturbed measurements and high-contrast images. This work gives an overview of the advanced developments made and demonstrates the effect of FFT signal processing.

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“…This paper builds upon the work done by Neu et al [19,22] in the field of EHL and aims to further bridge the gap between the numerical data, that has been known for several decades, and the recent experimental data. The CFD model developed by Neu et al, in the simulation environment OpenFOAM, simplifies the rolling bearing as an analogous model of a parallel plate capacitor, as was already experimentally done [8,12,23]. In this model the inner raceway and the rolling element represent the parallel plates of the capacitor, while the lubricant is considered to be the dielectric material, as shown in figure 1.…”

Section: Scope and Assumptionsmentioning

confidence: 99%

Pitting Influence on Electrical Capacitance in EHL Rolling Contacts

Zaiat

Ibrahim

Kirchner

2023

Preprint

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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.

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Method for in situ film thickness measurement of ball bearings under combined loading using capacitance measurements

Cited by 27 publications

References 13 publications

A comprehensive review of non-destructive methods for bearing lubricating oil film thickness measurement

A comprehensive review of non-destructive methods for bearing lubricating oil film thickness measurement

In-line fluorescence detector for production control in robot-driven environments

Pitting Influence on Electrical Capacitance in EHL Rolling Contacts

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