Comparison of Hydrodynamic and Elastohydrodynamic simulation applied to Journal Bearings

Cruz, Robson Ferreira da; Galli, Luis Antonio Fonseca

doi:10.4271/2010-36-0360

SAE Technical Paper Series 2010

DOI: 10.4271/2010-36-0360

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Comparison of Hydrodynamic and Elastohydrodynamic simulation applied to Journal Bearings

Robson Ferreira da Cruz¹,

Luis Antonio Fonseca Galli²

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2017

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Sequential Multi-Objective Optimization for Lubrication System of Gasoline Engines With Bilevel Optimization Structure

Zhang

Qiu

et al. 2017

Journal of Mechanical Design

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The lubrication system is one of the most important subsystems in gasoline internal combustion engines (ICEs), which provides hydrodynamic lubrication for friction pairs. The performance of the lubrication system affects the performance of the engine directly. The objective of this work is to reduce the friction loss of the engine and the driven power of the oil pump through design optimization. Two most important oil consumers in the lubrication system are investigated using multibody dynamics (MBD) and elastohydrodynamics (EHD). Considering that MBD and EHD analyses are time-consuming, Kriging is applied to establish the approximation models for bearings. Multi-objective optimization of bearings based on approximation models is formulated and conducted. Given the difference among multiple cylinders in the engine, a bilevel optimization framework is used to perform bearing optimization. The oil consumption and the friction loss of the bearings are reduced within the entire speed range. After that, the pipe diameters of the lubrication system are optimized with optimized bearings to reduce the flow resistance. With the optimization of both bearings and lubrication pipes in a sequential manner, the oil pressure is maintained at the baseline level while the oil pump size is reduced, and the driven power is averagely dropped over the entire speed range.

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Sequential Multi-Objective Optimization for Lubrication System of Gasoline Engines With Bilevel Optimization Structure

Zhang

Qiu

et al. 2017

Journal of Mechanical Design

View full text Add to dashboard Cite

show abstract

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Comparison of Hydrodynamic and Elastohydrodynamic simulation applied to Journal Bearings

Cited by 1 publication

References 3 publications

Sequential Multi-Objective Optimization for Lubrication System of Gasoline Engines With Bilevel Optimization Structure

Sequential Multi-Objective Optimization for Lubrication System of Gasoline Engines With Bilevel Optimization Structure

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