김충현 박지수 2024-01-19T21:04:43Z 2024-01-19T21:04:43Z 2021-09-06 2018-12 2713-8011 https://pubs.kist.re.kr/handle/201004/120607 In this study, the performance of foil thrust bearings was investigated by performing bearing takeoff and load capacity tests, using an in-house designed and manufactured vertical bearing test rig. The mean takeoff rotational speed and maximum load capacity of the bearing specimen were ~18,000 rpm and ~80 kPa, respectively. The vertical bearing test rig was observed to yield higher coefficients of friction and frictional torques than a horizontal bearing test rig under identical test conditions. This was a result of its structural characteristics, in that the bearing specimen is placed atop the thrust runner, which keeps it from being separated from the runner after the bearing take-off. In addition, bearing take-off was observed at a higher runner rotational speed as this structure keeps air from flowing between the top foil and runner surfaces, which requires a higher runner speed. The parallel alignment between the bearing specimen and runner surfaces can be maintained within a certain range more easily in a vertical test rig than in a horizontal test rig. Because of these advantages, Korean Industrial Standard, KS B 2060, recommends a vertical bearing test rig as the standard test device for foil thrust bearings. English 한국트라이볼로지학회 포일 스러스트 베어링의 성능 평가 Testing of Load Capacity of a Foil Thrust Bearing Article 10.9725/kts.2018.34.6.300 2 한국트라이볼로지학회지, v.34, no.6, pp.300 - 306 한국트라이볼로지학회지 34 6 300 306 kci ART002426519 foil thrust bearing vertical bearing test rig take-off bearing torque load capacity