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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/>
바인다 結束裝置의 機構學籍 分析에 관한 硏究 : 니들 作動 機構의 分析 Kinematical analysis of needle mechanism
李鍾瑚,金南銓,金哲洙 전북대학교 농업과학기술연구소 1981 農大論文集 Vol.12 No.-
In order to obtain the basic informations about the domestic manufacturing of binder the kinematical characteristics of the needle driving mechanism of two-row binder was examined, and the analytical models to detemine the kinematical quantities were developed and applied to the analysis of the dynamic properties of needle. The results obtained were as follows : 1. The needle driving mechanism was four-bar, crank-rocker mechanism of which outputmotion is derived from rocker which oscillates through 106 degrees. 2. The equations derived to calculate angular velocity and angular acceleration of the coupler link and rocker as well as displacements, velocities relative to the machine frame and the ground,and accelerations of the needle point were the same as the equations numbered from 13 to 26. 3. The maximum angular velocilty ratios of coupler link and rocker to driving link which had constant angular velocity of 16.76rad/sec. were 0.52 and 0.79, respectively, which occurred when the driving link had angular displacements of 315 and 85 degrees, respectively. The minimum values of these occurred when the driving link had angular displacements of 198 and 201 degrees, respectively, and the ratios were --1.01 and -1.40, respectively. 4. When the angular velocity of the driving link and the forward velocity of binder were 16.76 rad/sec and 0.6m/sec, respeclively, the maximum and the minimum velocites of the needle point relative to the ground were 47.1m/sec and 3.6m/sec, respectively, And the maximum and the minimum values of the acceleration of the needle point relative to the machine frame were 142.2m/sec2 and 15.6m/sec2. respectively.
훨 Run-out과 타이어/훨 Assembly 動的特性에 關한 考察
박병구,김남전,송태석,노국희 한국자동차공학회 1998 한국자동차공학회 학술강연초록집 Vol.1998 No.9
Imperfections of wheel geometry, run-out, is causing a deterioration of dynamic properties of tire/wheel assembly, which will induce the discomforts on vehicle. This paper focuses on the study how wheel imperfections influence on the dynamic properties, i.e. uniformity. and dynamic balance. Two types of geometrical imperfection should also be considered in wheel:: the. eccentricity for vertical vibration and the tilt for fluttering laterally. The effects of tilt on the vehicle vibration and the vehicle pull are reviewed. The tilt of wheel should be considered for. the matching of tire and wheel to reduce the radial force variation and the dynamic unbalance.