A finite-element-aided ultrasonic method for measuring central oil-film thickness in a roller-raceway tribo-pair  

作　　者：Pan DOU Tonghai WU Zhaopeng LUO Peiping YANG Zhongxiao PENG Min YU Tom REDDYHOFF 

机构地区：[1]Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System,Xi'an Jiaotong University,Xi'an 710049,China [2]Dongfang Electric Machinery Co.,Ltd.,Deyang 618000,China [3]School of Mechanical and Manufacturing Engineering,University of New South Wales,Sydney 2052,Australia [4]Department of Mechanical Engineering,Imperial College London,London SW72AZ,UK

出　　处：《Friction》2022年第6期944-962,共19页摩擦（英文版）

摘　　要：Roller bearings support heavy loads by riding on an ultra-thin oil film(between the roller and raceway),the thickness of which is critical as it reflects the lubrication performance.Ultrasonic interfacial reflection,which facilitates the non-destructive measurement of oil-film thickness,has been widely studied.However,insufficient spatial resolution around the rolling line contact zone remains a barrier despite the use of miniature piezoelectric transducers.In this study,a finite-element-aided method is utilized to simulate wave propagation through a three-layered structure of roller-oil-raceway under elastohydrodynamic lubrication(EHL)with nonlinear characteristics of the i)deformed curvature of the cylindrical roller and ii)nonuniform distribution of the fluid bulk modulus along the circumference of the oil layer being considered.A load and speed-dependent look-up table is then developed to establish an accurate relationship between the overall reflection coefficient(directly measured by an embedded ultrasonic transducer)and objective variable of the central oil-film thickness.The proposed finite-element-aided method is verified experimentally in a rollerraceway test rig with the ultrasonically measured oil-flm thickness corresponding to the values calculated using the EHLtheory.

关 键 词：ultrasonic measurement central oil-film thickness rolling line contact ray model finite-element-ISSN 2223-7690 CN10-1237/TH aided method 

分 类 号：TH117[机械工程—机械设计及理论]