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전기자동차 모터 유냉식 방열성능 향상을 위한 열전달 해석 및 최적화
장준호(J.H. Jang),오근우(G.W. Oh),Xiang Sun,김종수(J.S. Kim),곽태희(T.H. Kwak),최정일(J.-I. Choi) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.4
This paper presents the heat transfer analysis of the electric vehicle motor and optimization of an operating parameter for improving the performance of the motor with an oil cooling system. The homogeneous multi-phase flow model in commercial software, ANSYS CFX, is applied to solve the flow of mixture, including oil and air. We mainly focus on the influence of operating (oil level) and driving conditions (roll and pitch angles) on the cooling system. Several CFD simulations are performed with various input parameters (oil level, roll, and pitch angles) generated from the Latin Hypercube Sampling method. Based on the CFD results, we built a Polynomial Chaos Expansions based surrogate model to predict the temperature distribution, maximum temperature, and torque loss, which respond to the input parameters. Sensitivity analysis indicates that the oil level significantly affects system performance (maximum temperature and torque loss). Finally, the optimal range of oil level is estimated, considering the maximum allowable temperature of the motor.
장준호(J.H. Jang),권혁진(H.J. Kwon),김두만(D.M. Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The car bumper attached to the front and rear of the car is provided to protect the body, and it will act to absorb the shock of the moment when the car collide. The resiliency and high shock absorbing force are required to do so. The purpose of this paper is to design that utilizes the in-plane direction of the honeycomb adapted to the characteristics of the bumper and to compare with conventional structure. In-plnae direction of the honeycomb structure has a lower Youngs modulus than out-of-plane of it, and a flexible structure. LS-Dyna is used for finite element analysis of shock absorber, and CATIA was used for modeling for efficient analysis. The honeycomb structure has a more flexible structure, and it was confirmed that the honeycomb structure has a higher energy absorption characteristics in the study.