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주행 및 설계 조건에 따른 런플랫 타이어의 파괴 특성 연구
조기연(Ki Youn Cho),김기현(Gi Hyun Kim),조춘택(Choon Tack Cho) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
A run flat tire(RFT) is designed and developed to lead the vehicle is continually driven for certain periods of speed and time without inflated air. Recently various technologies of self supporting type of a run flat tire are actively researched and accomplished as increasing the consumer demand. Especially it is important to the performance of sidewall area including insert rubber and body ply depend on driving speed and load at the puncture mode. So, Influence evaluation is executed and analyzed during the different speed and load using the indoor high speed test machine and the thermal infrared camera(FLIR, SC640). And characteristic of each mode is analyzed on harsh condition until failure. Also, Durability variation of run flat tires is analyzed by different design of carcass cords.
타이어의 Belt Width 변화에 따른 Belt Edge Separation 예측 방법에 관한 연구
김성래(Seong-Rae Kim),성기득(Ki-Deug Sung),김선주(Son-Joo Kim),조춘택(Choon-Tack Cho) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.8
This study is concerned with the relation between steelbelt width and belt edge separation of a tire. Belt edge separation causes tire burst and threatens passenger's safety. For the reason, it is important to predict durability caused by belt edge separation in the early stage of the tire structure design. Usually, passenger car tires have two layers of steelbelts having opposite steel cord's angles, which makes a shear behaviour between each belt layer. Shear behaviour is one of reason to cause belt edge separation. In this study, to predict belt edge separation, we suggested the prediction method of belt edge separation and evaluated the effect of steelbelt width on the belt edge separation using FEM. We also studied on main parameters to affect shear behaviour at the belt edge area.
FEM을 이용한 타이어의 벨트각도에 따른 PRAT 및 코너링 특성 연구
성기득(Ki Deug Sung),김성래(Seong Rae Kim),김기현(Ki Hyun Kim),김선주(Sun Joo Kim),조춘택(Choon Tack Cho) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.2
The influence of tire belt angle on the Plysteer Residual Aligning Torque(PRAT) and the cornering stiffness by the FEM has been studied. The PRAT is a performance factor of the tire about vehicle pull, and the cornering stiffness has relation to vehicle steering response of outdoor test. To validate FE model for analysis, simulation data for both the static stiffness(vertical, lateral) and the PRAT have been compared with the experimental data. In addition to the characteristics of the PRAT and the cornering stiffness due to the tire belt angle, rolling and cornering contact characteristics have been studied. The tendency of the PRAT and the cornering stiffness due to the belt angle can be used as a guide line for the tire design in relation to vehicle pull and vehicle steering response.
타이어 특성인자에 따른 차량 전복 동특성 해석에 관한 연구
권성진(Seong-Jin Kwon),김찬중(Chan-Jung Kim),배철용(Chul-Yong Bae),이봉현(Bong-Hyun Lee),구태윤(Tae-Yun Koo),조춘택(Choon-Tack Cho) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Single vehicle accidents sometimes lead to vehicle rollover. Rollover is defined as a vehicle rotation of 90 degree or more around its longitudinal axis. In this paper, the multi-body vehicle dynamic model has been constructed to investigate vehicle rollover propensity. The vehicle dynamic model consisted of body, suspension, steering, power-train, brake, tire, road, and driver subsystems. The whole vehicle parameters, each vehicle's part parameter, part connecting elements such as spring, damper and bush, and tire characteristic factors were measured by an experiment to accomplish accurate rollover analysis. With the developed vehicle dynamic model, rollover characteristic analysis due to tire characteristic factors, such as cornering stiffness and cornering force peak has been carried out.
천연고무/부타디엔고무(NR/BR)혼합고무와 황동피복코드의 접착성질
서곤,전경수,손봉영,조춘택,조평래,정승원 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.1
천연고무(NR고무)와 부타디엔고무(BR고무)의 혼합고무에 대한 물성과 황동피복코드의 접착성질을 조사하였다. BR고무 혼합량이 많아지면 가황된 사슬의 끊어짐(reversion)이 억제되어 가교밀도가 커진다. 이에 따라 영률은 증가되나 파열점에서 측정되는 인장강도와 연신율은 파열에너지 저하로 낮아진다. 접착시편에서 높은 고무부착정도는 접착계면 강도가 고무층에 비해 상대적으로 크다는 것을 보여준다. BR고무가 증가함에 따라 뽑는 힘이 감소한다. 뽑는 힘과 혼합고무의 인장강도의 좋은 상관성은 뽑는 힘이 혼합고무의 피로성질에 주로 관련이 있음을 나타낸다. 황동피복코드와 접착에 대한 NR고무와 BR고무간 상호작용은 나나지 않았다. Physical properties and adhesion characteristics of blended rubber compounds composed of natural rubber(NR) and butadiene rubber(BR) were investigated. With increasing BR content, crosslinking density was increased due tn the inhibition of reversion. As a result, Young's modulus was increased, while tensile strength and elongation measured at break point was decreased due to the decrease of tear energy. High values of rubber coverage of these adhesion test samples showed that the strength of adhesion interface was relatively higher than that of rubber layer. Pullout forces decreased with increase in the BR content. A good relationship between pullout force and tensile strength of the blend is observed, indicating that pullout force is mainly dependent on the fatigue properties of the blend. Interaction between NR and BR in the blended rubber compounds for the adhesion with brass-plated steel cord was not observed.