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서강원(Kangwon Seo),성재혁(Jaehyuk Sung),홍경민(Kyungmin Hong),김억(Ok Kim),전용(Yong Chun) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Thermoplastic Vulcalnizations (TPV) was examined to be applied to the rubber parts like guard-valve-body and diaphragm in brake systems. Automotive rubber parts exposed to harsh environmental conditions and duration criteria unlike other industries, are not easy to be replaced with environmentally-friendly thermoplastic material. In Industrial conditions in addition to other polymer material fields, automotive rubber materials have difficuties to meet the friendly-environment conditions. In this study, TPV of PP/EPDM compounds close to the rubber properties in the middle of Thermoplastic Elastomer (TPE) were applied to the rubber parts in the needs like durabilities. Properties were inferior to thermoset rubber, but products performance requirements were satisfied. In brake systems, Guard-valve-body is able to protect the valve-body of booster from foreign matters and to control the air inlet, and Diaphragm is able to induce pressure between the two different rooms and to seal. When TPV of PP/EPDM was apllied for both guard-valve-body and diaphragm, properties results seems to be appropriate in the given environmental conditions. Satisfactory behaviors in automotive parts conditions were able to be determined with PP/EPDM in performance and durability.
서강원(Kangwon Seo),이기양(Keeyang Lee),홍경민(Kyungmin Hong),전용(Yong Jun) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Automobiles always have Severe environmental conditions. Therefore, Rubber parts of automobiles also are exposed to such severe conditions that automobiles have environmentally and durably. Particularly, Brake systems demand heavy durabilities and broad temperature conditions between about 120℃ and -40℃. Due to these conditions, it has been difficult that rubber are substituted to thermoplastic materials in the field of automobile industry. However, Environment-Friendly and Recyclability have made TPV (Thermoplastic Vulcanization) or TPE (Thermoplastic Elastomer) applied to automobile. In North-American and European automobile industry, Many precedents for TPV substitution could be investigated as well as in Japanese industry. In Brake system, PP/EPDM could be satisfied the severe conditions with both durability and environment conditions.
Instrument Panel Skin용 소재의 장기노화 특성연구
서강원(Kangwon Seo),채승철(Seungchul Chae),이영길(Youngkil Lee),박성국(Sungkuk Park) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Environments around a vehicle give many aging-factors. Aging-factors consist of solar light, thermal effect, humidity, chemical pollutant and physical external forces etc.. Fundamentally, Heat and Light play important roles in Polymer Degradation. Heat-aging and Light-aging make most powerful effecs on the polymers that compose the Instument Panel Skin Materials. It is possible to analyze the effects of either Heat or Light for the Skin Materials and those in Outdoor Exposure Test. But We meet the block to find the relationship between Outdoor Exposure Test and Heat/Light-Aging directly. Indirectly, Long-term testing for both Outdoor Exposure and Heat/Light threw a little light on the understanding. Outdoor Exposure Test was executed at Arizona during over 100,000 Langleys. And Heat/Light-aging tests have being taken in lab-scale. Both Light-aging over 2500kJ/㎠ in Ci-4000 and Heat-aging around 1000hr at 120℃ were able to degrade the skins more severely than Outdoor Exposure with 100,000 Langleys.
대형승용차용 Propeller Shaft의 NVH 성능향상에 관한 연구
권상석(Sangseuk Kweon),서강원(Kangwon Seo),안현수(Hyunsoo An) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The purpose of this paper is an improvement of propeller shaft NVH performance for premium passenger car. Propeller shaft in using premium passenger car has a large influence on ride quality, stability and NVH performance. Propeller shaft where is used in the high-class passenger car is characterized by high torque stiffness, light weight and hign quality. It is used generally in SUV and are demanding the matter of NVH performances of the formation passenger car are more important. In this paper, the propeller shaft manufacturing process about weight of the factor which influences to NVH performances and factor between analysis uses 6 sigma techniques and analyzes with to decide the factor which is important influences vehicle NVH performances, under improving high-class passenger car Propeller Shaft NVH performances.