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복합화력발전소 가스터빈 압축기 블레이드에 대한 손상원인 고찰
양경현(Yang, Kyeong-Hyeon),송오섭(Song, Oh-Seop),조철환(Cho, Cheul-Whan),윤완노(Yun, Wan-No),정남근(Jung, Nam-Geun) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.11
Gas turbine compressor blades used in a combined cycle power plant are possibly damaged and fractured during their operation. There are two possible causes of the failure of compressor blades; one is a defect of material quality which can be detected through some microscopic inspections for the fracture section, the other is high cycle fatigue problem caused by vibration and can be diagnosed by carrying out dynamic characteristics analysis for the blades. In this paper, in order to determine the cause of the failure of compressor blades in a combined cycle power plant, examination of the fracture section and the propagation mechanism of the crack via stress analysis are performed. Dynamic characteristics analysis via FRF estimation is also performed to identify the cause of failure.
양경현(Yang Kyeong-Hyeon),조철환(Cho Chul-Hwan) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
In this paper, we analyzed the characteristic of the broken section for bolts fastening the generator casing. According to the frequency analysis, we grasped the characteristic of the excited force, traced the path of the exciting source so that we examined a factor of transient vibration of the generator casing. By solving troubles of the generator rotor, we reduced the vibration amplitude to the normal condition. Even if it appears transient vibration again, we applied spring washer, more tensile bolt to prevent the fracture.
양경현(Yang, Kyeong-Hyeon),송오섭(Song, Oh-Seop) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.12
Variation of dynamic characteristics of a low pressure turbine blade with crack length is studied in this paper via both experiments and finite element model. Since most of the turbine blades used in domestic power plants are imported from abroad, it is necessary to understand their dynamic behavior in advance. When experimentally obtained natural frequencies and mode shapes are compared with those from FEM results, they are close to each other in their magnitude. Then, it is more feasible to use finite element model for analyzing the dynamic characteristics of a blade under various operation conditions (rotation speed, temperature, etc) as well as with a crack in the blade.
IPB 덕트의 진동저감과 지지부 기초에 대한 동특성 고찰
양경현(Yang Kyeong-Hyeon),조철환(Cho Chul-Hwan) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
Because of resonance between natural frequency of the second floor base for IPB(Isolated Phase Bus) duct supports in a power plant and operation frequency of the turbine, there was high amplitude vibration on IPB duct. To reduce vibration of IPB duct, Firstly it was set a FEM model to seek the mode shape for the concrete structure. Secondly, it was carried out dynamic analysis for the FEM model. Lastly, because the natural frequency of the concrete structure could not be changed, it was changed supports position for the IPB duct near to beams. It resulted in reducing vibration of IPB duct.