An ultrasonic measurement method for full range of oil film thickness

2018 ◽  
Vol 233 (3) ◽  
pp. 481-489 ◽  
Author(s):  
Kai Zhang ◽  
Pan Dou ◽  
Tonghai Wu ◽  
Kai Feng ◽  
Youquan Zhu
Keyword(s):  
Reflection Coefficient ◽  
Film Thickness ◽  
Measurement Method ◽  
Ultrasonic Method ◽  
Dead Zone ◽  
Full Range ◽  
Thickness Measurement ◽  
Ultrasonic Measurement ◽  
Center Frequency ◽  
Oil Film

Ultrasonic method is quite promising for oil film thickness measurement in industry, while there is normally a dead zone for one ultrasonic sensor with a special center frequency when measuring the oil film thickness by the traditional reflection coefficient amplitude. In this paper, an ultrasonic measurement method for full range of oil film thickness was investigated. The theoretical relationship between the oil film thickness and the reflection coefficient phase was firstly built up and the reflection coefficient phase was found to be able to measure the oil film thickness in the dead zone. Then the reflection coefficient amplitude and phase were combined to measure the oil film thickness in the full range. A high-precision calibrated rig, which could form a series of known film thicknesses oil layers, was set up and the performance of this method was shown to work well. This method is significant for online oil film thickness monitoring in industry.

Ultrasonic measurement of oil film thickness between the roller and the inner raceway in a roller bearing

2015 ◽  
Vol 67 (6) ◽  
pp. 531-537 ◽  
Author(s):  
Kai Zhang ◽  
Qingfeng Meng ◽  
Wei Chen ◽  
Junning Li ◽  
Phil Harper
Keyword(s):  
Reflection Coefficient ◽  
Film Thickness ◽  
Contact Region ◽  
Ultrasonic Method ◽  
Roller Bearing ◽  
Piezoelectric Element ◽  
Content Type ◽  
Oil Film ◽  
Roller Bearings ◽  
Contact Width

Purpose – This paper aims to measure the oil film thickness between the roller and the inner ring in roller bearings by the ultrasonic method. The oil film thickness between the roller and the inner ring in roller bearings is a key performance indicator of the bearing lubrication condition. As the oil film is very thin and the contact region is very narrow, measurement of this film thickness is very challenging. A promising ultrasonic method was used to measure this film thickness, and this method was expected to overcome some drawbacks in other methods. Design/methodology/approach – A simplified roller bearing only configured one roller, and an inner ring was built up to investigate this measurement. A miniature piezoelectric element is bonded on the inner surface of the inner ring to measure the reflection coefficient from the layer of oil between the roller and the inner raceway. As the width of the line contact region is smaller than the width of the piezoelectric element, a ray model is used to calibrate the reflection coefficient measured. The quasi-static spring model is then used to calculate oil film thickness from the corrected reflection coefficient data. Findings – The results measured by this method agree reasonably well with predictions from elastohydrodynamic lubrication (EHL) theory. Also, a dynamic displacement of the rig caused by the skid of the roller versus the inner ring was found under light-load and high-speed conditions. Originality/value – This work shows that the oil film between the roller and the inner raceway in roller bearings can be measured accurately by ultrasound and shows a deal method when the contact width is smaller than the piezoelectric element width.

Influence of Seawater Refractive Index on the Precision of Oil Film Thickness Measurement by Differential Laser Triangulation

2015 ◽  
Vol 42 (4) ◽  
pp. 0408004
Author(s):  
耿云飞 Geng Yunfei ◽  
陈曦 Chen Xi ◽  
金文 Jin Wen ◽  
张惠群 Zhang Huiqun ◽  
邬海强 Wu Haiqiang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Film Thickness ◽  
Thickness Measurement ◽  
Laser Triangulation ◽  
Oil Film ◽  
Film Thickness Measurement

316 Measurement of Oil Film Thickness of Porous Sliding Bearing by Ultrasonic Method

2007 ◽  
Vol 2007 (0) ◽  
pp. 258-261
Author(s):  
Seigo NISHIMURA ◽  
Masaki YAKABE ◽  
Sigeru OHTSUKA ◽  
Kouitsu MIYACHIKA ◽  
Takao KOIDE
Keyword(s):  
Film Thickness ◽  
Ultrasonic Method ◽  
Sliding Bearing ◽  
Oil Film

Ultrasonic measurement of oil film thickness using piezoelectric element

2016 ◽  
Vol 94 (9-12) ◽  
pp. 3209-3215 ◽  
Author(s):  
Kai Zhang ◽  
Tonghai Wu ◽  
Qinghu Meng ◽  
Qingfeng Meng
Keyword(s):  
Film Thickness ◽  
Piezoelectric Element ◽  
Ultrasonic Measurement ◽  
Oil Film

scholarly journals Thickness Measurement of Thin Oil Layers in Triboelectrical Phenomenon Aspect

2015 ◽  
Vol 27 (1) ◽  
pp. 87-98 ◽  
Author(s):  
Emil Nowiński ◽  
Bolesław Giemza ◽  
Marek Domański
Keyword(s):  
Film Thickness ◽  
Thickness Measurement ◽  
Popular Method ◽  
Oil Film ◽  
The Real ◽  
Measurement Apparatus ◽  
Real Value ◽  
Thickness Measurements

Abstract This paper presents problems of oil film thickness measurements, especially during tribological experiments. There are many methods of oil layer measurement. More of them is used in measurement apparatus. Most popular method to oil film thickness is electric method. Authors indicate that triboelectrical phenomenon disrupts the real value of resistance because of charge particles which change conductance of the oil layer.

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