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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.
정기현(Ki-Hyun Chung),양원호(Won-Ho Yang),고명훈(Myung-Hoon Ko),성기득(Ki-Deug Sung) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Many mechanical fastened methods have been proposed in order to retard crack initiation and to improve fatigue life. In order to the crack which occurs under the cold expansion residual stress, it necessary the stress intensity factor analysis required. From this analysis, it is possible to estimate the stability of fracture mechanical behavior and fatigue life of the fastened structures. The fatigue crack growth tests were performed for the CT(compact tension) specimen in which the residual stress by cold expansion had been generated. The cold expansion method delays the crack initiation, but hasten the crack growth propagating from the hole. The crack growth rate increases due to the increase in the cold expansion ratio. da/dN- ΔK curves arc slightly different corresponding to the cold expansion ratio, but the curves me included within un agreeable band.
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.
A Study on the Method for the Temperature Analysis of Side Wall for the Durability of Run-Flat Tires
김형진(Hyung Jin Kim),이진환(Jin Hwan Lee),김성래(Seong Rae Kim),성기득(Ki Deug Sung),배원병(Won Byoung Bae) Korean Society for Precision Engineering 2018 한국정밀공학회지 Vol.35 No.7
Recently, the concern for safety is increasing as customers’ interest in Run-Flat tires, which can assure their safety in case of a puncture when driving, is growing. Run-Flat tires continues to evolve with the demands of customers who want the performance of general tires such as fuel-consumption and comfort from the basic Run-Flat function in the 1st generation. Run-flat tires are designed in various ways to cope with puncture in pneumatic tires. Currently, Run-flat tires in which Runflat Inserts are inserted into sidewalls of the tires are mainly used. In this study, we would like to propose a method to predict the temperature of sidewall of a Run-flat tires while running and how it affects the durability. We predicted the temperature distribution of sidewall during the running of Run-flat tires by calculating energy loss which is from the viscoelastic characteristic of rubber through deformation analysis of tires, and verified the prediction technique by comparing with the Run-flat endurance test.
차량 롤오버 성능 해석을 통한 설계변수 민감도 분석에 관한 연군
권성진(Seong-Jin Kwon),배철용(Chul-Yong Bae),김찬중(Chan-Jung Kim),이봉현(Bong-Hyun Lee),구태윤(Tae-Yun Koo),성기득(Ki-Deug Sung) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Rollover is defined as a vehicle rotation of 90 degree or more around its longitudinal axis. Understanding the effects of vehicle and tire properties on the rollover propensity is an essential research. In this paper, the sensitivity analysis of vehicle and tire design variables has been investigated by vehicle rollover analysis, which contains multi-body vehicle dynamic models and nonlinear tire models. For the purpose, the several orthogonal arrays based on the DOE (Design of Experiments) analysis has been constructed, and main effects and percent effects of each vehicle and tire design variable has been discussed on diverse rollover characteristics.
유한요소법을 이용한 레일의 헤드에 존재하는 균열의 응력확대계수에 관한 연구
인경환,성기득,김종욱,조명래,양원호 成均館大學校 科學技術硏究所 1999 論文集 Vol.50 No.1
In recent years, the rolling stock is being increasingly developed. However, higher axle loads have increased the incidence of fatigue defects in railroad rails. Many of these fatigue-initiated defects develop in the head of the rail. The head defects are very important because they are generally not visible until they reach quite large size and they can lead to catastrophic rail fractures. In this paper, stress intensity factors(SIF) of a embedded crack in the head of the rail were analysed along the wheel positions relative to the crack plane and along the running condition using the finite element method.