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황도인(D. I. Hwang),정경문(K. M. Jeong),정현성(H. S. Jeong),이철민(C. M. Lee),김기운(K. W. Kim),배길한(G. H. Bae) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The aircraft tires usually have severe operating constrains requiring high speed, high loads, high inflation pressure and so on. These conditions are causes of very high tire wear rate. So, we need to develop technologies which are related with the estimation of tread wear life for improving aircraft tire. This paper proposes the estimation method of tread wear life through the wear equations, frictional energy rate, and assumption of operational impact rate on wear. The frictional equations for tread wear of aircraft tire are obtained by Lab. wear test. The frictional energy rates with respect to velocities of aircraft tires are calculated by finite element analysis. These results and operational impact rate on wear are used to estimation of tread wear life of aircraft tire.
공기압 타이어의 균일 성장 형상 이론과 승용차용 래디얼 타이어에의 적용
김남전(N.J.Kim),김기운(K.W.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
The new tire profile theory, USCT, which is based on the membrane theory is developed. When the torus tube is inflated, the work done by the internal pressure is minimum if the torus deformation is uniform. The total strain energy of the torus is equal to the work done by the internal pressure, W_k=U_k. The potential energy, U_k, is also minimum if the torus deformation is uniform. The finite element process seeks such a displacement pattern with the minimum potential energy.<br/> In order to get the uniform swelling contour, the a-iteration method, which is composed of the iterative 2 dimensional finite element analysis and nodal coordinate transformation is used. The a is the tire series dependent characteristic value which is in the range of 0 to 1.<br/> The USCT profile is verified by the laser profilometer measurements. The USCT tire has the better performance than the conventional tire in endurance, handling and weight.<br/>
타이어 접지압 분포특성 규명을 위한 신경회로망 적용연구
신성우(S. W. Shin),정현성(H. S. Jeong),조진래(J. R. Cho),김남전(N. J. Kim),김기운(K. W. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
Tire is a very important part of automobile because it supports entire automobile weight. As well, it characterizes major tire and automobile performances. Here, we intend to analyse contact pressure characteristics of tire by using neural algorithm. The tire analysis includes very difficult issues such as contact treatment, nonlinear material behavior and 3D analysis for contact pressure, and which requires considerably long CPU time. In order to minimize the numerical analysis cost, we employ a neural network for learning the tire contact pressure behavior.
김재연(J. Y. Kim),양영수(Y. S. Yang),김기운(K. W. Kim) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Tire belt durability is characterized by the initiation of a crack at the belt edge region, and the propagation of the crack until the ply is separated. Experimental methods have been used to analysis of the belt durability in the cord-reinforced rubber composite tires, but it takes much cost and time to make experiments. In this paper, a finite element method to analyze the fatigue life of a crack at the belt edge of tires is presented. The fatigue life is analyzed by using a three-dimensional Finite Element Modeling. This method includes a global-local finite element analysis to provide the detail necessary to model explicitly an internal crack and use of the J-integral for energy release rate evaluation.