http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
손성만(Sungman Son),박경석(Kyoungsuk Park) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The temperature of exhaust gas. was raised by increasing of engine movement on developing engine. Thermal of high temperature and pressure reverse in bellows, because of increasing of engine movement and the thermal performance of converter in combustion. As a result, thermal loss is increased and thermal efficiency is decreased rapidly in bellows, it can occur to damage in mechanical structure. In this study, it was necessary to analyze back pressure performance and thermal characteristic on driving condition in exhaust system. We adapted braid type bellows and straight type exhaust pipe. It was compared with curve type exhaust pipe for lay-out on considering to design of exhaust system It was necessary to improve thermal characteristic and back pressure performance so that exhaust cavity pipe(ECP) was installed between bellows and catalyst convert. Not only decreasing back pressure was solved but also thermal characteristic problems in exhaust pipe because of increasing capacity. We analyzed that exhaust system have an effect on engine combustion performance. According to this study, the basis of data is presented when new exhaust system is designed.
저속 회전 시 배기시스템의 배압이 정숙성에 미치는 영향
강일석(Il-Seok Kang),양성모(Sung-Mo Yang) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.6
In recent years, the driving performance and exhaust sound quality in automobiles have been recognized as important factors, as they maximize the driving fun to fulfil the demands of customers. Therefore, many automobile manufacturers are studying various exhaust pipe shapes to improve sound quality and optimize exhaust pressure. The objective of the exhaust pipe design is to maximize the engine efficiency using optimal exhaust pressure settings. In this study, an exhaust system was fabricated with different junction shapes, and the results were analyzed through various experiments. The exhaust gas pressure acting inside the exhaust pipe was measured using a pressure transducer. Meanwhile, the vibration generated in the vehicle was measured in three axial directions and analyzed. The ground noise generated in the indoor and outdoor of the vehicle was measured, and the noise generated at the maximum output was measured and analyzed.
남광희(Kwanghee Nam),엄용석(Yongseok Eom),장용수(Yongsoo Jang) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
자동차 배기시스템의 구조는 엔진에서 연소된 고온, 고압의 가스가 배기 시스템을 통하여 대기로 배출된다. 연소된 배기 가스는 CO, HC 등과 같은 유해 물질이 포함되어 있는데 이를 정화시키기 위해 촉매장치를 활용하여 H<sub>2</sub>O, CO<sub>2</sub> 와 같이 무해한 기체로 변환된다. 이런 촉매장치는 충격에 약한 세라믹으로 되어 있으며 안정된 고정을 위해 부드러운 매트로 감싸 캔 파이프에 넣고 고정하게 된다. 이를 캐닝이라 하며 요구되는 보증기간동안 촉매장치를 안전하게 보호하는 역할을 한다. 캐닝은 일반적으로 스터핑 공법과 사이징 공법으로 나뉘는데 스터핑 공법은 품질 산포가 많아 근래에는 사용하지 않는 공법이며 사이징 공법으로는 촉매장치를 삽입 전에 촉매장치와 매트의 품질을 측정 후 캔 파이프를 요구 사이즈로 만들어 촉매장치를 매트로 감싼 후 캔 파이프에 넣는 방법과, 촉매장치와 매트 품질을 측정 후 사이즈가 큰 캔 파이프에 안전하게 넣고 사이즈를 조정하는 방법이 대표적이다. 그러나 이 공법들은 촉매장치와 매트를 전수 측정해야 하는 설비 및 공정 추가와 측정된 제품의 치수를 전산 연동 작업하는 비용이 발생하여 신공법 개발의 필요성이 대두되었다. 신규 개발 검토한 공법은 측정되지 않은 촉매장치와 매트를 안정하게 감싼 후 캔 파이프에 밀어 넣는 과정에서 매트의 면압을 측정하여 캔 파이프의 사이징량을 산출하는 방법이다. 이는 과거에 진행되어 왔던 촉매장치와 매트의 측정설비, 공정이 없어져 비용적인 면에서 효과적이며, 또한 산출된 사이징량을 통해 요구되는 촉매면압을 확보하므로 촉매장치의 보증기한은 기존 사이징 공법과 동일한 내구력의 확보가 가능하다. 최근 기술검토 및 1년여의 기간을 통한 설비 제작이 완료되어 양산공정을 위한 마무리 품질 육성중입니다.
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.
조재천(Jaecheon Jo),사정환(Junghwan Sa),이강훈(Kanghun Lee),이윤권(Yoonkwon Lee),이기주(Kiju Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 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 quality 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 statistical analysis and to evaluate average life in short term. This study was applied by the statistical analysis method of ASTM E739.