Lubrication condition monitoring of journal bearings in diesel engine based on thermoelectricity  

作　　者：Yuhao LV Hao LIU Zhigang CHEN Weijie CHANG Hui ZHANG Hulin LI 

机构地区：[1]Shanghai Jiao Tong University,Shanghai 200240,China [2]National Key Laboratory of Marine Engine Science and Technology,Shanghai 201108,China [3]Shanghai Marine Diesel Engine Research Institute,Shanghai 201108,China [4]Hunan Aviation Powerplant Research Institute,Aero Engine Corporation of China,Hunan 412002,China

出　　处：《Friction》2024年第11期2532-2547,共16页摩擦（英文版）

基　　金：supported by Shanghai Municipal Natural Science Foundation(No.22ZR1430600).

摘　　要：There is still a lack of effective lubrication condition monitoring methods in the field of diesel engines.The paper proposes a novel thermoelectric approach to divide the lubrication state of bearings.First,the generation mechanism of thermoelectric potential on bearings is clarified.Then,both experimental and simulation studies are done,and a strong correlation between lubrication and thermoelectric potential is shown.The film thickness and temperature are further confirmed as significant factors influencing thermoelectric potential.Generally,the thermoelectric potential increases with temperature.However,a small film thickness ratio(when the film thickness ratio is less than 4)will suppress the thermoelectric potential.Three typical lubrication states of bearings are distinguished through thermoelectric potential and supported by the Stribeck curve results.Moreover,the significant influence of lubrication on the bearing is confirmed through the analysis of surface morphology and composition.

关 键 词：journal bearing lubrication state thermoelectric potential condition monitoring 

分 类 号：TH117[机械工程—机械设计及理论]