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우종운(Jongwoon Woo),한인수(Insu Han),이선봉(Seonbong Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Because of the rapid development of the vehicle industry, cost reduction and short-term of product development time have key subjects. To reduce the time scale and overall cost of product development, proving ground based, it is essential to carry out the accelerated durability testing. One of the methods achieving these objectives is estimated durability analysis and testing based on fatigue theory. This paper describes the work that was measured road load data from the proving ground. All the data measured from this experiment are recorded as strain tim histories. Hence, we can find damage factors which give effects on the fatigue life of bellows.
이태희(Taehee Lee),한인수(Insu Han),우종운(Jongwoon Woo),이선봉(Seonbong Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The potential damage factor of the vehicle exhaust muffler are thermal shock, thermal stress due to exhaust gas and repetition of complex load from engine and road. Therefore, it should ensure high reliability of the product to meet the growing environmental regulations and the needs for consumers. In this paper, the potential failure of the muffler cause and failure modes were studied. Acceleration model at the level of the scale parameter using maximum likelihood estimation was obtained. The acceleration model was applied to the Inverse Power model to determine the suitability.
유동현(Donghyun Yu),정봉수(Bongsoo Jung),문남수(Namsu Mun),이강훈(Kanghun Lee),한인수(Insu Han),김종일(Jongil Kim),김희진(Heejin Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Automotive exhaust system is composed of flange connected with exhaust manifold, bellows to absorb vibration of engine and road, muffler to reduce exhaust noise of engine, and pipes. The significant damage factors influencing the exhaust system life are thermal stress due to exhaust gas and repetition of complex load such as bending, torsion and tensile loads from engine and road. RLDA (Road Load Data Acquisition) is preceded to predict exhaust system durability life, but there are several problem like constraint of time and cost. So durability test simulating RLDA data is necessary. In this study, RLDA is performed at a proving ground in order to evaluate durability of exhaust system, and the obtained data is analyzed in order to select the most suitable for simulation durability test.
조재천(Jaecheon Jo),문남수(Namsu Mun),이기주(Kiju Lee),한인수(Insu Han),김종일(Jongil Kim),김희진(Heejin Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Failure of the exhaust pipe can cause air pollution by reducing ability of exhaust gas purification and can cause noise pollution and ride degradation by reducing ability of noise isolation. Therefore, it should ensure high reliability of the product to meet the growing environmental regulations and the needs of consumers. However, under actual conditions of use, it spends a lot of time and cost in order to develop products of high reliability. Therefore, accelerated life test to estimate the relationship between stress and life is performed to predict the actual life from the observed data through tests of the product by promoting the failure of products in severe conditions than real use conditions. The purpose of this study is estimating lifetime of exhaust pipes through accelerated life test and to evaluate average life, failure rate and etc. in short term.
압출 구형 TPU Powder 적용 파우더 슬러쉬 공법 개발
곽성복(Sungbok Kwak),주상률(Sangyul Ju),이상락(Sangrak Lee),문찬성(Chansung Moon),정기연(Giyun Jeoung),한인수(Insu Han),조성민(Sungmin Cho) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
크래쉬 패드 분체성형 공법적용 TPU 구형 파우더 소재 개발은 세계 최초로 Micro-pelletizing 기술을 분체 성형에 도입하여 기존3단계로 제조되는 파우더 제조공정을 1단계로의 공정단축을 통한 제조비용 감소가 가능하고, 특히 고비용의 저온동결 분쇄 공정을 생략됨으로써 제조비용을 획기적으로 줄일 수 있다. 또한, 입도분포 균열화를 통한 재료 Loss율 저감, 입자 구상화로 인한 분체 흐름성 향상을 통하여 핀홀(Pin-Hole)발생 억제 등의 우수한 성형성 확보가 가능하며 저온특성이 우수하여 Invisible 에어백장착이 가능하여 고부가가치화가 가능하다. 재활용성 측면에서 보면 TPU는 PVC와는 달리 열 회수를 위한 소각 시 인체유해 성분을 배출하지 않으므로 재활용성 향상이 가능하며, TPU의 경우는 중간재인 PU Foam과의 일체화로 재활용성이 더욱 향상된다. 따라서 크래쉬 패드 분체성형 공법적용 TPU 구형 파우더 소재 개발은 제조공정 단축을 통한 제조 비용감소, 소비자들의 내구성 향상 요구 만족 그리고 재활용성을 향상시킬 수 있는 기술로서 최근에 국내 자동차 제조사가 직면한 생존경쟁에서 유리한 위치를 점 할 수 있는 획기적 기술로서 연구의 가치가 높다고 판단된다. 본 연구에서는 이러한 TPU 소재를 최적의 입자 사이즈와 분체성형공법(PSM)에 적합한 소재를 개발하고자 한다.