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강유신(Yoosin Kang),홍의석(Uiseok Hong) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Tread material of tire have been actively developed to decrease the rolling resistance depending on the growth of importance for fuel efficiency of vehicle. Tread material has significant impact on rolling resistance, braking distance and tread wear and they are trade-off relationship on vehicle performance. In order to make a balance regarding to these performances a novel functionalized S-SBR were employed. Also through the optimization of recipe and procedure for rubber mixing, traction and tread wear performances are obtained in the level of a good performance tire in market. 10 percent decrease of rolling resistance comparing with reference tire is achieved.
정소라(Sola Chung),홍의석(Uiseok Hong),장호(Ho Jang) 한국트라이볼로지학회 2007 한국윤활학회지(윤활학회지) Vol.23 No.6
The brake performance of sintered friction materials for the high speed train was studied. In this study, newly developed sintered materials based on copper were compared with the commercial products for high speed trains. They were tested on a 1/5 scale dynamometer using low carbon steel disks. Effectiveness, fade, and recovery tests were carried out to examine friction performance and the change of disk thickness variation (DTV) during brake applications and noise propensity were also evaluated. Results showed that the two sintered friction materials exhibit similar friction coefficients and braking performance, whereas the newly developed friction material was superior in terms of DTV generation and noise propensity to the commercial friction material. The improvement of the newly developed friction material was attributed to the high graphite content which reduced the stick-slip phenomena and prevented uneven disk wear by producing friction films on the counter disk.
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.