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Analysis of thermoelastohydrodynamic performance of journal misaligned engine main bearings

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Abstract

To understand the engine main bearings’ working condition is important in order to improve the performance of engine. However, thermal effects and thermal effect deformations of engine main bearings are rarely considered simultaneously in most studies. A typical finite element model is selected and the effect of thermoelastohydrodynamic(TEHD) reaction on engine main bearings is investigated. The calculated method of main bearing’s thermal hydrodynamic reaction and journal misalignment effect is finite difference method, and its deformation reaction is calculated by using finite element method. The oil film pressure is solved numerically with Reynolds boundary conditions when various bearing characteristics are calculated. The whole model considers a temperature-pressure-viscosity relationship for the lubricant, surface roughness effect, and also an angular misalignment between the journal and the bearing. Numerical simulations of operation of a typical I6 diesel engine main bearing is conducted and importance of several contributing factors in mixed lubrication is discussed. The performance characteristics of journal misaligned main bearings under elastohydrodynamic(EHD) and TEHD loads of an I6 diesel engine are received, and then the journal center orbit movement, minimum oil film thickness and maximum oil film pressure of main bearings are estimated over a wide range of engine operation. The model is verified through the comparison with other present models. The TEHD performance of engine main bearings with various effects under the influences of journal misalignment is revealed, this is helpful to understand EHD and TEHD effect of misaligned engine main bearings.

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Authors and Affiliations

  1. State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China

    Fengrong Bi, Kang Shao, Changwen Liu, Xia Wang & Jian Zhang

Authors
  1. Fengrong Bi
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  2. Kang Shao
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  3. Changwen Liu
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  4. Xia Wang
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  5. Jian Zhang
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Corresponding author

Correspondence to Fengrong Bi.

Additional information

Supported by National Science and Technology Support Program of China: Vibration and Noise Reduction Technology Research and Application of Bulldozers and Other Earth Moving Machinery(Grant No. 2015BAF07B04)

BI Fengrong, born in 1965, is currently a professor at Tianjin University, China. He received his PhD degree from Tianjin University, China, in 2003. His research interests include engine noise and vibration control, automobile dynamics, etc.

SHAO Kang, born in 1981, is currently a PhD candidate at State Key Laboratory of Engines, Tianjin University, China. He received his master degree from Tianjin University, China, in 2009. His research interests include engine crankshaft dynamic.

LIU Changwen, born in 1963, is currently a professor at Tianjin University, China. His research interest is engine’s electronic control technology.

WANG Xia, born in 1984, is currently a PhD candidate at State Key Laboratory of Engines, Tianjin University, China. She is currently studying the digital signal processing of engine’s noise and vibration.

ZHANG Jian, born in 1983, is currently a PhD candidate at State Key Laboratory of Engines, Tianjin University, China. He is currently studying the engine vibration signal processing.

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Bi, F., Shao, K., Liu, C. et al. Analysis of thermoelastohydrodynamic performance of journal misaligned engine main bearings. Chin. J. Mech. Eng. 28, 511–520 (2015). https://doi.org/10.3901/CJME.2015.0228.020

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  • DOI: https://doi.org/10.3901/CJME.2015.0228.020

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