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(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.
LBP와 LOP형 틸팅 패드 베어링의 예압 변화가 소형 가스터빈의 횡진동 특성에 미치는 영향
하진웅(Jin Woong Ha),명지호(Ji Ho Myung),석진익(Jhin Ik Suk),이안성(An Sung Lee) 한국유체기계학회 2010 유체기계 연구개발 발표회 논문집 Vol.2010 No.12
In tilting pad bearing design process, selection of the proper configuration type of either Load-Between-Pad (LBP) or Load-On-Pad (LOP) as well as preload condition for the system is to be carefully considered. In this paper, it is found that pad pressure, minimum film thickness and dynamic characteristic in a 5 pads tilting pad bearing of LBP and LOP configurations are influenced by preload variation. In this context, rotor dynamic analysis of the 5 ㎿ gas turbine supported by tilting pad bearing in the front and roller bearing in the rear is carried out based on dynamic characteristic of the tilting pad bearing investigated. The result shows that 2nd mode whirl natural frequency is significantly affected by preload applied to both LBP and LOP configurations. It is also confirmed that the unbalance response characteristic at the rear bearing position is affected sensitively by preload applied to the LOP configuration.
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.
USC 발전소용 12 Cr 계 마르텐사이트강의 저주기피로특성
김국철(Kim Kuk-Cheol),석진익(Suk Jin-Ik),김병훈(Kim Byung-Hoon),김정태(Kim Jeong-Tae) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The objective of this study is to investigate the characteristics of low cycle fatigue for the candidate bucket material (DS2B2) developed by Doosan. Turbine bucket is subjected to the repeated thermal stress during shutdown and heat-up. Therefore, LCF characteristics is of much concern in order to meet the fatigue life requirement. At room and service temperature of 593℃, LCF test were carried out for DS2B2 and commercial materials COST B2. Both DS2B2 and COST B2 materials were refined by VIM and ESR process. DS2B2 material was more superior to COST B2 for LCF life. The LCF characteristics of DS2B2 materials manufactured by VIM and ESR processes was improved as compared with that by VIM process. It can be seen that the harmful element S and non-metallic inclusions were reduced and the grain size was finer through the ESR refining process.
초초임계압 발전용 소재의 장시간 열처리에 따른 미세조직 변화와 기계적 특성의 상관관계 연구
주성욱,유정훈,신기삼,허성강,이재현,석진익,김정태,김병훈,Joo Sungwook,Yoo Junghoon,Shin Keesam,Hur Sung Kang,Lee Je-Hyun,Suk Jin Ik,Kim Jeong Tae,Kim Byung Hoon 한국재료학회 2005 한국재료학회지 Vol.15 No.1
For the good combination of high-temperature strength, toughness and creep property, $9-12\%$ chromium steels are often used for gas turbine compressors, steam turbine rotors, blade and casing. In this study, the correlation of microstructural evolution and mechanical properties was investigated fur the specimens heat-treated at 600, 650 and $700^{\circ}C$ for 1000, 3000 and 5000 hrs. The microstructure of as-received specimen was tempered martensite with a high dislocation density, small sub-grains and fine secondary phase such as $M_23C_6$. Aging for long-time at high temperature caused the growth of martensite lath and the decrease of dislocation density resulting in the decrease in strength. However, the evolution of secondary phases had influence on hardness, yield strength and impact property. In the group A specimen aged at $600^{\circ}C\;and\;650^{\circ}C$, Laves phase was observed. The Laves phase caused the increase of the hardness and the decrease of the impact property. In addition, the abrupt growth of secondary phases caused decrease of the impact property in both A and B group specimens.
소형 가스터빈 엔진용 squirrel cage support의 강성 특성 해석
명지호(Ji ho Myung),하진웅(Jin woong Ha),김동훈(Dong hun Kim),석진익(Jhin ik Suk) 한국유체기계학회 2010 유체기계 연구개발 발표회 논문집 Vol.2010 No.12
In this paper it is intended to verify the formula to calculate stiffness of the squirrel cage supporting a 5 ㎿ power generation gas turbine engine. For verification of the formula used for designing two Squirrel cages of the gas turbine, currently being developed at Doosan Heavy Industry (DHI), 3 D finite element method analysis such as ANSYS and V12 are utilized and stiffness test was carried out. The result indicates that the stiffness of the Squirrel cage is influenced by thickness and length of extended part of the bearing support as well as bar geometric configuration.
김정태(Jeong-Tae Kim),지병하(Byung-Ha Chi),강성태(Sung-Tae Kang),석진익(Jin-Ik Suk),김민수(Min-Soo Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.8
Recently, steam temperature in thermal power plant has been increasing in order to improve the efficiency. Superior high temperature mechanical properties such as creep rupture strength and cyclic fatigue strength are required for materials applied for turbine high and / or intermediate pressure rotor, blades and casing of the advanced steam(ultrasupercritical ; USC) power plant above 593℃. A high strength 9~12% chromium ferritic heat-resistant steels, which contain W and/or Nb, were developed for these applications. This paper reports progress on assessing the required properties such as impact toughness, tensile, shift of fracture appearance transition temperature with long aging treatment, creep, LCF and demonstrates the continued confidence in these materials for potential use for turbine components in the 593℃ steam turbine.
안성종(Sung-Jong Ahn),박누가(Luke Park),윤태준(Tae-Jun Yun),석진익(Jin-ik Suk) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
Doosan has been developing a 5MW class gas turbine engine, DGT-5. Campbell diagram has been used for prediction of possible occurrence of resonances of rotating machinery. The Campbell diagram consists of blade natural frequency and excitation frequency. In this paper, modal characteristics of compressor and turbine blades are investigated and Campbell diagram is obtained. We calculated compressor and turbine blade’s natural frequency using ANSYS tool. The result has been verified through test.
9-12%Cr강의 첨가원소 및 열처리에 따른 미세조직거동과 경도변화
주성욱,유정훈,신기삼,허성강,이재현,석진익,김병훈,김정태 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-
9-12%Cr steel are getting increasing attention for expanded application as high temperature materials applicable for gas turbine compressors, steam turbine rotors, blade and casing. For efficient and extensive application of 9-12%Cr steel, the data in addition to the improvement of mechanical properties on the correlation of microstructural evolution and mechanical properties are inevitable and thus the investigation in this study is performed for the determination for the specimens heat-treated at 600, 650 and 700℃ for 1000, 3000 and 5000hrs. The microstructure of as-received specimen was tempered martensite, with a high dislocation density and secondary phases. Upon high temperature heat-treatment, the martensite lath got larger and dislocation density decreased resulting the reduction of the strength. In addition, sharp growth of secondary phases was observed in the specimen heat-treated at 700℃ for 5000hrs. A specimen aged at 600℃ and 650℃ Laves phase was observed. The hardness showed close relationship with the secondary phase particle and dislocation density.
Fe-10Cr-10Ni-2W 마르에이징강에서 인접 래스 사이의 결정학적 방향관계
홍순형,남수우,석진익 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.11
The microstruture of the solution-treated and subsequently quenched Fe-10Cr-10Ni-2W maraging steel consists of fully lath martensite with high dislocation density. The orientation relationship between adjacent laths in maraging steel has been studied using transmission electron microscopy. A twin relationship between some adjacent martensitic laths is observed. It is identified that the twinned laths are transformed from the austenite of two specific variants with a Kurdjumov-Sachs orientation relationship.