Numerical modeling of journal bearing considering both elastohydrodynamic lubrication and multi-flexible-body dynamics |
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Authors: | J Choi S S Kim S S Rhim J H Choi |
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Institution: | 1.Senior Research Engineer, FunctionBay, Inc.,Gyeonggi,Korea;2.School of Mechanical and Aerospace Engineering,Seoul National University,Seoul,Korea;3.Department of Mechanical Engineering,KyungHee University,Gyeonggi,Korea |
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Abstract: | This study uses an elastohydrodynamic lubrication model coupled with multi-flexible-body dynamics (MFBD) to analyze dynamic
bearing lubrication characteristics, such as pressure distribution and oil film thickness. To solve the coupled fluid-structure
interaction system, this study uses an MFBD solver and an elastohydrodynamics module. The elastohydrodynamics module passes
its force and torque data to the MFBD solver, which can solve general dynamic systems that include rigid and flexible bodies,
joints, forces, and contact elements. The MFBD solver analyzes the positions, velocities, and accelerations of the multi-flexible-body
system while incorporating the pressure distribution results of the elastohydrodynamics module. The MFBD solver then passes
the position and velocity information back to the elastohydrodynamics solver, which reanalyzes the force, torque, and pressure
distribution. This iteration is continued throughout the analysis time period. Other functions, such as mesh grid control
and oil hole and groove effects, are also implemented. Numerical examples for bearing lubrication systems are demonstrated. |
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