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Sidewall 반경변화에 따른 Carcass 장력분포 변동 추이에 관한 유한요소 해석
조진래,정현성,이홍우,김남전,김기운,Jo, Jin-Rae,Jeong, Hyeon-Seong,Lee, Hong-U,Kim, Nam-Jeon,Kim, Gi-Un 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.6
Tire performance is significantly influenced by the carcass tension distribution that is governed by the sidewall contour. To maximize the tire performance, it is very important for one to find the sidewall contour with the ideal tension distribution. But it is not easy to find such an optimal sidewall contour. Therefore, in order for a successful tire-shape optimization, we need to investigate how the change of sidewall radius influences on the carcass tension distribution. In this paper, we intend to numerically investigate the relation between the sidewall-radius change and the carcass tension distribution.
회전하는 타이어의 변형에너지 손실에 의한 온도분포 해석
박현철,윤성기,송태석,김남전,Park, Hyun-Cheol,Youn, Sung-Kie,Song, Tae-Sok,Kim, Nam-Jeon 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.5
This paper addresses the systematic procedure using sequential approach for the analysis of the coupled thermo-mechanical behavior of a steady rolling tire. Not only the knowledge of mechanical stresses but also of the temperature loading in a rolling tire are very important because material damage and material properties are significantly affected by the temperature. In general, the thermo-mechanical behavior of a pneumatic tire is highly complex transient phenomenon that requires the solution of a dynamic nonlinear coupled themoviscoelasticity problem with heat source resulting from internal dissipation and friction. In this paper, a sequential approach, with effective calculation schemes, to modeling this system is presented in order to predict the temperature distribution with reasonable sccuracies in a steady state rolling tire. This approach has the three major analysis modules-deformation, dissipation, and thermal modules. In the dissipation module, an analytic method for the calculation of the heat source in a rolling tire is established using viscoelastic theory. For the verification of the calculated temperature profiles and rolling resistance at different velocities, they were compared with the measured ones.
조진래,신성우,정현성,김남전,김기운,Cho, Jin-Rae,Shin, Sung-Woo,Jeong, Hyun-Sung,Kim, Nam-Jeon,Kim, Kee-Woon 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.10
Contacting with ground in the post-card area size only, tire supports entire automobile weight. As well, it characterizes most of automobile running performance. Among the design parameters, the carcass contour becomes a key design factor. This paper deals with the time-effective optimal design of tire crown contour in order to improve the tire wear performance by employing a back-propagation neural network model.
조진래,정현성,이홍우,김남전,김기운,Jo, Jin-Rae,Jeong, Hyeon-Seong,Lee, Hong-U,Kim, Nam-Jeon,Kim, Gi-Un 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.10
Automobile maneuverability and tire durability are significantly influenced by the sidewall tire contour. In order to improve these tire performances, it is very important far one to determine a sidewall contour producing the ideal tension and strain-energy distributions. However, these requirements can nut be simultaneously achieved by conventional non-interactive multi-objective optimization methods based on mathematical programming, because these exhibit the conflicting behavior each other, with respect lo the sidewall contour. Therefore, we execute the tire contour optimization fur improving the maneuverability and the tire durability using satisficing trade-off method.
다물체 동역학 프로그램을 이용한 차량쏠림 Simulation
이정환(Jung-Hwan Lee),이주완(Juwan Lee),김남전(Nam Jeon Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
During normal operating condition, constant disturbances from several sources are acting on vehicles. These disturbances come from external sources like wind and road crown, or internal sources like tires, suspension and chassis. The disturbances from these sources pull a vehicle in the lateral direction during straight-ahead motion. Studied in this paper was the effect of road crown, tires, and suspension on vehicle straight-ahead motion using a multibody dynamics program. Effect of each variahle on straight-ahead motion was evaluated from the simulation results of straight-ahead motion during 100 m run under free control mode. In addition to this, vehicle behavior during straight-ahead motion under fixed control mode was also examined.
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.