Drag Torque Prediction of Automotive Wheel Bearing Seals Considering Material and Geometrical Uncertainties Using Monte
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ght © 2020 KSAE/ 11811 pISSN 12299138/ eISSN 19763832
DRAG TORQUE PREDICTION OF AUTOMOTIVE WHEEL BEARING SEALS CONSIDERING MATERIAL AND GEOMETRICAL UNCERTAINTIES USING MONTE CARLO SIMULATION Seung Pyo Lee1), Jae Hoon Kim2) and Ki Weon Kang3)* R&D Center, ILJIN Global, 527, Samseong-ro, Gangnam-gu, Seoul 06157, Korea Advanced Railroad Vehicle Divison, Korea Rail Road Institute, 176, Cheoldobangmulgwan-ro, Uiwang, Gyeonggi-do 16105, Korea 3) Department of Mechanical Engineering, Kunsan National Unversity, Kunsan, Jeollabuk-do 54150, Korea 1)
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(Received 5 August 2019; Revised 3 February 2020; Accepted 8 February 2020) ABSTRACTIn this study, the drag torque was predicted considering the uncertainties in geometry and material properties of automotive wheel bearing seals. For this, the deformation of the seals was firstly analyzed using numerical analysis based on the finite element method. Three types of experiments for material properties of rubber were conducted to improve the reliability of deformation analysis for the rubber seals. In addition, hyperelastic analysis was conducted using the experimental results. To consider the geometrical and material uncertainties of the seals, Monte Carlo simulation was performed considering variations in dimension and rubber properties. As Monte Carlo simulation to analyze the deformation of the seals takes a very high computational cost, a response surface was created using design of experiment (DOE) and then Monte Carlo simulation was performed using this response surface. Based on the simulation results, sensitivity analysis was conducted to analyze design variables that affect the drag torque of the rubber seal. Finally, variation in the drag torque of the automotive wheel bearing seals was evaluated using the results of Monte Carlo simulation. KEY WORDS : Automotive wheel bearings, Geometrical uncertainty, Material uncertainty, Monte Carlo simulation, Rubber seals
1. INTRODUCTION
bearing is a performance index directly related to the fuel consumption. Components that play a pivotal role for this drag torque are rubber seals. To reduce the drag torque, studies on the geometrical design and material selection for rubber seals have been conducted Moon et al. (2010), Park (2016), Jun et al. (1993) and Dragoni and Strozzi (1988). For examples, Moon et al. (2010) predicted the performance of the seal lip by conducting the nonlinear analysis of wheel bearing seals and evaluated the reliability of the analytical model through a comparison with test results. They also optimized the geometry of seals using the response surface method. Park (2016) predicted the drag torque of automotive wheel bearing seals through finite element (FE) analysis. Jun et al. (1993) conducted theoretical and experimental research on the contact force of rubber seals for bearings and compared the results from the theory and experiment. Dragoni and Strozzi (1988) conducted numerical analysis on the indentation phenomenon of rubber O-ring seals due to rectangular grooves and compared the results with
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