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타이어 트래드 고무가 SNOW 및 제동 성능에 미치는 영향 연구
염기호(Kiho Yum),이철우(Chulwoo Lee),주광진(Kwangjin Joo),조현철(Hyunchul Cho),홍의석(Uiseok Hong),Wendll Collins,정진천(Jincheon Jung),김호중(Hojung Kim),장민영(Minyoung Jang),김용하(Yongha Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In this research, the influence of tire tread compound on snow and braking performance was studied. First, the tire snow performance according to the viscoelastic properties of tire tread compound was investigated though the vehicle test. Secondly the influence of tire tread compound on braking performance was studied by controlling viscoelastic properties and ambient temperature. Finally the relationship between tire snow and braking performances was identified. It was founded that the glass transition temperature and loss modulus of tire tread compound are strongly related with snow performance. As glass transition temperature and loss modulus decrease, acceleration time and stopping distance on the road covered with compressed snow decreases. In addition, the tire with higher tan δ tread compound from 0℃ to 20℃ has shorter stopping distance characteristics on the dry road. Especially, higher stopping distance increase in terms of road surface temperature increase was found for the tire with higher decreasing rate in tan δ from 0℃ to 20℃. It was concluded that the tire with shorter acceleration time and stopping distance on the snow covered road has a longer stopping distance tendency on the dry road.
염기호(Kiho Yum),김효석(Hyo-Seok Kim),이철우(Chulwoo Lee),장석희(Suk-Hee Jang),김봉수(Bong-Su Kim),임형진(Hyoung-Jin Im) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In this research, vehicle gravel & sand noise was studied from a view of tire design. First, the mechanism of gravel & sand noise was identified by driving on the road where sand and small particles of gravel were spread. Second, the influence of tire design parameter on vehicle gravel noise was studied by controlling tire tread pattern and viscoelastic characteristics of tire tread rubber and then the influence on braking and rolling resistance performance was also studied. It was found that high frequency gravel noise was mainly recognized in the rear seat of SUV and decreases as road surface temperature increases. In addition, the directional tread pattern with symmetry was found to amplify gravel noise. Finally, it was found that gravel noise has a relationship with tanδ characteristics in low temperature and braking distance. In particular, gravel noise decreases as braking distance decreases.
타이어 구름 저항 측정 방법 간 최적화된 추정 방법 연구 및 적용
서정인(Jeongin Seo),서명규(Myoungkyu Seo),염기호(Kiho Yum),장영석(Youngseok Jang),이기연(Ghiyoun Lee) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
To measure tire rolling resistance, majority of the industry uses two methods, ISO 28580 and SAE J1269. Differences of test procedures between them result in tradeoffs in measurement time and coverage. ISO 28580 requires 2 hours per tire measurement and it only can represent resistance under limited driving condition. on the other hands SAE J1269 requires 4 hours per tire but can represent resistances under various axial loads and pressures. Thus there has been a requirement to estimate various resistances by using simpler resistances. This study describes an optimized method to estimate tire resistance measured on SAE J1269 by using tire resistance measured on ISO 28580. This paper suggests building linear regression models between ISO 28580 and SAE J1269 on several areas separated by axial loads and tire pressures. The suggested method showed R2 of 0.9 and mean absolute error of 0.1.