http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
5패드 틸팅 패드 베어링의 설계 조건 변화가 소형 가스터빈의 횡진동 특성에 미치는 영향
하진웅(Ha, Jin-Woong),명지호(Myung, Ji-Ho),석진익(Suk, Jhin-Ik),이안성(Lee, An-Sung),김영철(Kim, Young-Cheol) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.8
In tilting pad bearing design process, the selection of the proper configuration type of either a load-between-pad(LBP) or load-on-pad(LOP) as well as preload and pivot offset conditions is to be carefully considered. Also the bearing needs to be designed in order to be suited for the rotor-bearing system and operating condition. In this paper, it is observed that the dynamic characteristics in a five pad tilting pad bearing for the LBP and the LOP configurations are influenced by the variation of preload and pivot offset. In this context, rotor dynamic analysis of the 5 MW industrial gas turbine supported by the tilting pad bearing at the front and roller bearing at the rear is carried out based on the dynamic coefficients of the tilting pad bearing investigated. The result shows that two rigid body critical modes experience various changes according to the influence of the tilting pad bearing uniquely applied to one side of this machine. Mainly, the second critical speed, the rigid body mode of conical shape with high whirling in the tilting pad bearing, is significantly changed by preload and pivot offset regardless of the LBP and LOP configurations. And, the first critical mode, the rigid body mode of conical shape with high whirling in the roller bearing, is sensitively affected by preload applied to the LOP configuration and by its asymmetric dynamic properties.
5패드 틸팅 패드 베어링의 설계 조건 변화가 소형 가스터빈의 횡진동 특성에 미치는 영향
하진웅(Jin Woong Ha),명지호(Ji Ho Myung),석진익(Jhin Ik Suk),이안성(An Sung Lee),김영철(Young Cheol Kim) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
In tilting pad bearing design process, the selection of the proper configuration type of either a Load-Between-Pad (LBP) or Load-On-Pad (LOP) as well as preload and pivot offset conditions is to be carefully considered. Also the bearing needs to be designed in order to be suited for the rotor-bearing system and operating condition. In this paper, it is observed that the dynamic characteristics in a 5 pad tilting pad bearing for the LBP and the LOP configurations are influenced by the variation of preload and pivot offset. In this context, rotor dynamic analysis of the 5MW industrial gas turbine supported by the tilting pad bearing at the front and roller bearing at the rear is carried out based on the dynamic coefficients of the tilting pad bearing investigated. The result shows that two rigid body critical modes experience various changes according to the influence of the tilting pad bearing uniquely applied to one side of this machine. Mainly, the second critical speed, the rigid body mode of conical shape with high whirling in the tilting pad bearing, is significantly changed by preload and pivot offset regardless of the LBP and LOP configurations. And, the first critical mode, the rigid body mode of conical shape with high whirling in the roller bearing, is sensitively affected by preload applied to the LOP configuration and by the its asymmetric dynamic properties.
일방향응고 내켈기 초내열합금의 저주기 피로수명에 대한 변형률 속도의 영향
마영화(Young Wha Ma),송전영(Jeon Young Song),구지호(Ji Ho Gu),석진익(Jhin Ik Suk) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Low cycle fatigue (LCF) fracture is one of the important failure modes in gas turbine blades that are usually subjected to high centrifugal force and cyclic thermal stress during every start-up and shut-down of gas turbine engine. And LCF life depends on the strain range, strain ratio, strain rate and temperature. In this study, effect of strain rate on the high temperature LCF life was investigated for a directionally solidified Nibased alloy 247LC alloy. Strain rate range was 0.1%~1.0%/s and strain ratio was -1. From the test results, it was found that the LCF life is shorter as the strain rate is faster until about 1000 cycles at all test temperatures, but there is little difference thereafter. In other words, there was little effect of strain rate after 1000 cycles. In order to confirm the strain rate effect on the LCF life of the blades in actual operation condition of gas turbine engine, LCF testing with lower strain rate should be additionally conducted and verified in the future.
5㎿ 급 발전용 가스터빈 엔진 터빈 블레이드 구조해석 및 수명 평가
윤태준(Taejun Yun),김동화(Dong-Hwa Kim),김동훈(Dong-Hun Kim),박누가(Luke Park),석진익(Jhin-Ik Suk) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
There are a lot of Gas Turbine engine applications for power generation and they undergo variety of loads. The turbine blade component producing power for Gas turbine engine is subjected to sever thermal and mechanical loads in operating condition. These loads are changed by different operating mode and alternating loads make fault in weak portions of turbine blades. Major damage mechanisms are Low cycle fatigue, creep, oxidation and corrosion etc. In this paper, finite element analysis method simulated turbine blade structural condition. Turbine blade life is estimated by linear creep-fatigue damage summation method.