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장석희 ( Suk Hee Jang ),김욱수 ( Wook Soo Kim ),강용구 ( Yong Gu Kang ),한민현 ( Min Hyun Han ),장상목 ( Sang Mok Chang ) 한국고무학회 2013 엘라스토머 및 콤포지트 Vol.48 No.2
Characteristics of rubber mixture were evaluated in order to find the optimum mixing conditions of compounds containing silica and silane at various temperatures. With different mixing temperatures of 105, 120, 130, 140 and 160℃, the viscosity of the compound mixed at 105℃ showed a very high viscosity value. Compounds mixed the temperature range from at 120℃ to 140℃ showed lower viscosity than the compound mixed at 105℃. However, the difference was found to be small in those temperature ranges. On the contrary, at the mixing temperature of 160℃, the viscosity of compound increased again. Through the physical and dynamic observations, it was verified that at the mixing temperature below 120℃ only insufficient silica-silane reaction has been obtained. In addition, with the elevated mixing temperature of 160℃, Cross-linking occurred during mixing by the sulfur contained in coupling agent. In the temperature ranges from 120℃ to 140℃, because of the fast coupling reaction at higher temperature, it was thought to be more advantageous during reaction even though the trend of viscosity and dynamic mechanical property was not clear.
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.