이용복 박동진 김창호 2024-01-20T22:35:26Z 2024-01-20T22:35:26Z 2021-09-06 2008-09 1225-6382 https://pubs.kist.re.kr/handle/201004/133173 Turbocharger has a main purpose on recycling of the exhaust gas from the engine cylinder. On the basis of the facility characteristics, the turbocharger supported on floating ring bearings has some problems such as the large volume, oil supplement for lubrication and high power loss due to high operating torque. The air foil bearing has been studied as the bearing element to be able to alternate the floating ring bearing without the problems of the floating ring bearing. In this study, the air foil bearing has 2 parts; journal and thrust bearings, and the test facility consists of the engine, exhaust and intake parts. In addiction, the specification of the turbocharger follows a small turbocharger for SUV engine. The engine speed is varied from 750 (idle rpm) to 2,500 rpm and then, the rotating speed of the turbocharger rotor is accelerated from 0 to 100,000 rpm. From those experiments, the comparison between the performances of the air foil bearing and floating ring bearing is conducted and the results show that the air foil bearing has less power loss, maximum 770 watt, than the floating ring bearing, maximum 5,110 watt. This result verifies that the air foil bearing is more efficient and able to output more power under the same condition of the input power. Korean 한국자동차공학회 디젤 엔진 차량의 무급유 터보차져의 성능 평가에 관한 연구 A Study on the Characteristics of Oil-free Turbocharger for Diesel Engine Vehicles Article 2 한국자동차공학회 논문집, v.16, no.4, pp.47 - 55 한국자동차공학회 논문집 16 4 47 55 kci ART001255790 터보차져 공기 포일 베어링 플로팅 링 베어링 동력 손실 안정성 해석 Turbocharger Air foil bearing Floating ring bearing Power loss Instability analysis