An Apparatus for Measuring the Oil Film Thickness in Dynamically Loaded Bearings

Tripp, H. A.

doi:10.4271/872044

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…When the oil film thickness is less than 3 mm, the measurement results of nonconductive lubricating grease are superior to those of conductive lubricating grease (Huan et al, 2022). Tripp (1987) established an experimental setup for eddy current sensors to measure oil film thickness between flat surfaces. Since then, eddy current technology has been widely used to monitor the oil film thickness in thrust bearings (Zhang et al, 2015a(Zhang et al, , 2015b.…”

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%

“…Tripp (1987) established an experimental setup for eddy current sensors to measure oil film thickness between flat surfaces. Since then, eddy current technology has been widely used to monitor the oil film thickness in thrust bearings (Zhang et al.…”

Section: Electrical Measurement Methodsmentioning

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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“…However, under some circumstances it is very difficult to find a suitable method for measuring the oil-film thickness. During the last few decades, several techniques have been used for oil-film measurement, mostly in automotive and marine diesel engine bearings [2][3][4][5][6][7]. In some cases the variation in electrical properties (resistance or capacitance) of the oil film could be correlated to the minimum oil-film thickness [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Other approaches used inductive transducers for the distance measurement [5,6]. Inductive sensors are very accurate and reproducible provided that the target is conducting.…”

Section: Introductionmentioning

confidence: 99%

An on-line monitoring system for oil-film, pressure and temperature distributions in large-scale hydro-generator bearings

Höbel¹,

Haffner²

1999

Meas. Sci. Technol.

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Instrumentation that allows the behaviour of a hydro-generator thrust bearing to be monitored during operation is described. The measurement system was developed at the Asea Brown Boveri corporate research centre in Switzerland and was tested under realistic operating conditions at the Harbin Electric Machinery Company bearing-testing facility in the People's Republic of China. Newly developed fibre-optical proximity probes were used for the on-line monitoring of the thin oil film between the static and rotating parts of the bearing. These sensors are based on a back-reflection technique and can be used for various target materials such as Babbitt and Teflon. The monitoring system comprises about 120 temperature sensors, four pressure sensors and five optical oil-film thickness sensors. Temperature sensors are installed at specific static locations, whereas pressure and oil-film sensors are positioned in the runner and generate data during rotation. A special feature of the monitoring equipment is its on-line processing capability. Digital signal processors operating in parallel handle pressure and oil-film thickness data. Important measurement parameters such as the maximum pressure, maximum temperature and minimum oil-film thickness are displayed on-line. Detailed three-dimensional temperature information on one of the load segments can be obtained from subsequent off-line data analysis. The system also calculates two-dimensional plots of the oil-film thickness and pressure for most of the 12 load segments.

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Relating High-Temperature, High-Shear-Rate Viscosity to Engine Operation

Spearot

1989

High-Temperature, High-Shear Oil Viscosity: Measurement and Relationship to Engine Operation

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The argument over which values of oil viscosity best correlate with measures of engine operation has gone on for many years. Over a decade ago (1977), the membership of the Engine Oil Subcommittee of the Society of Automotive Engineers (SAE) Fuels and Lubricants Committee (now the Fuels and Lubricants Division) agreed that there were enough data to justify asking the appropriate ASTM subcommittee (D02.07) to develop methods for determining values of high-temperature, high-shear-rate (HTHS) oil viscosity and to relate them to engine operation. In 1984, an ASTM task force finished reviewing the available literature and composed a report that summarized the effects of viscosity on bearing oil film thickness, engine wear, engine friction, and fuel economy (ASTM DS-62). This paper reviews the findings of that report and updates them in light of recent studies. The case for incorporating HTHS viscosity specifications into the Engine Oil Viscosity Classification, SAE J300, is presently stronger than ever. Suggestions are offered on how this incorporation might be accomplished and on what future directions ASTM research on HTHS viscosity should take.

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An Apparatus for Measuring the Oil Film Thickness in Dynamically Loaded Bearings

Cited by 6 publications

References 7 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

An on-line monitoring system for oil-film, pressure and temperature distributions in large-scale hydro-generator bearings

Relating High-Temperature, High-Shear-Rate Viscosity to Engine Operation

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