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타이어와 지면간 마찰계수의 실시간 추정 알고리즘에 대한 연구
박승욱(Seung-uk Park),김경웅(Kyung-woong Kim),나병철(Byung-chul Na) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
If the real-time maximum traction force between the tire and the road can be precisely estimated, it would be easier to control the vehicle behavior. Usually, estimation of friction coefficient requires tire tread stiffness and tire contact length on road surface. But in this research, tire tread stiffness property and contact length are obtained from traction force and self-aligning moment. Using the estimation method introduced in this paper, only required parameters are lateral, longitudinal, vertical force, self-aligning moment and rotational speeds of all wheel. Isotropic tire brush model is used to obtain the equations of traction force and self-aligning moment. Validation of developed algorithm is performed based on real tire data, and the possibility of friction coefficient estimation is confirmed.
최창은,박재현,박승욱,Choe, Chang-Eun,Park, Jae-Hyeon,Park, Seung-Uk 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.10
Single liquid droplet combustion processes including heating, evaporation, droplet burning and flame radiation were theoretically investigated by adopting nongray gas radiation model for the radiative transfer equation (RTE). n-Heptane was chosen as a fuel and the numerical results were compared with the experimental data available in the literature. The discrete ordinate method (DOM) was employed to solve the radiative transfer equation and the weighted sum of gray gases model (WSGGM) was applied to account for nongray effect by CO$_{2}$, and H$_{2}$0. Therefore, detailed effects by nongray gas and its comparison with the gray gas model could be figured out in the results. It is found that the radiative heat flux is higher when the nongray model is used, thereby reducing the maximum gas temperature and the flame thickness, but the total burning time increases due to the deceased conductive heat flux in nongray model. Consequently, a better agreement with experimental data could be obtained by using nongray model.