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한승우(Han, Seung-Woo),노철우(Roh, Cheol-Woo),유무상(Yoo, Mu-Sang),김인철(Kim, In-Chul),주인국(Joo, In-Gouk),김명식(Kim, Myong-Shik) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.2
This case study refers to turbine-generator with retrofitted turbine rotor. Vibration problem occurring after the retrofit was mainly due to high vibration from exciter side. However, repeated test run and operation during scheduled maintenance caused high vibration from generator bearing, and post-overhaul test run before turbine vibration correction caused oil whip on the bearing. This case study shows how to analyze vibration condition of high turbine generator vibration detected during the post-overhaul test run and vibration condition of offline and online data to reflect it on establishing maintenance schedule and overhaul correction procedure. Vibration data could be acquired during steady load operation or even with varying speed and load. Each data is important for machinery condition evaluation. This case study shows that the vibration data during extreme condition is the key factor in analysis, which helps to find the machinery problem.
유무상(Mu-Sang Yoo),한승우(Seung-Woo Han),노철우(Cheol-Woo Roh),류길수(Kil-Su Ryu),오승태(Seung-Tae Oh) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
Generator is the main equipment of a power plant that generates electric power. The line frequency is 60Hz, since that is operated at 3600rpm in fossil power plant. Therefore, the specific frequency 120Hz by the electromagnetic excitation force is generated inherently. If the looseness of stator at generator happens, abnormal sound that has 120Hz and the harmonic frequency is emitted from generator frame. In that case, binding of end-winding or re-wedging is needed for the reduction of sound level. In case of severe level of sound, belly band can be additionally installed at core. In this paper, the characteristics of generator sound is described and modal data is analyzed after installation of belly band.
대형 입형펌프 운전 중 공진현상의 진동 저감을 위한 스티프너의 설계 및 성능 검증
류길수(Kil-su Ryu),봉석근(Suk-keun Bong),한승우(Seung-woo Han),노철우(Cheol-woo Roh),이동민(Dong-min Lee),이정우(Jung-woo Lee),박준홍(Junhong-Park) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
This case study refers to resonance with vertical pumps. Vibration problem occurring after the inverter was installed for speed control. Its problem was appeared any revolution under rated speed. Vibration data was acquired during normal operation and transient state. We examined FRF on its resonance in field and also analyzed a result by finite element method. There was carried out the retrofit in field which was based on these results for solving problem.
대형 입형펌프 운전 중 공진현상의 진동 저감을 위한 스티프너 설계 및 성능 검증
류길수(Ryu, Kil-Su),봉석근(Bong, Suk-Keun),한승우(Han, Seung-Woo),노철우(Roh, Cheol-Woo),이동민(Lee, Dong-Min),이정우(Lee, Jung-Woo),박준홍(Park, Junhong) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.1
This case study presents a practical method to reduce resonant vibration of large vertical pumps. The pumps are driven at 400 rpm rated speed by induction motor. The vibration was not significantly large when operated at this rated speed. Large vibration was occurred when the pump was operated below the rated speed for flow control. Due to the large vibration resonance, variable speed operation of the pump was not possible for several months at worst cases. To find an efficient vibration control method, the flexural responses of pumps for both normal and transient operations were measured. The measured modal characteristics were compared with those of finite element analysis. When the pump was operated at a specific rpm, the natural mode whose resonance frequency is twice the rotating angular speed induced the large vibration. The retrofit utilizing stiffeners to reduce this resonant vibration were performed. Effects of designed stiffeners on reducing vibration were validated through tests after actual installation.