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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.
진동 감시용 위치 결정 센서의 위상오차에 대한 실험적 고찰과 비교평가
오승태(Seung-Tae Oh),유무상(Mu-Sang Yoo),봉석근(Suk-Keun Bong) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
Field balancing is required in any kind of phase information for the determination location balancing mass toward a rotor unbalance mass. Phase or phase angle is a measurement of the relationship of how one vibration signal which relates to another vibration signal and is commonly used to calculate the placement of balance weight. In this paper, A right guideline shows the photo optical speed sensor as the external keyphasor is a very useful when diagnosing machinery vibration problems on considering a phase lag comparing to the laser optical speed sensor. Some experimental results generate the interesting phase errors when appling to a wrong conditions. So, Usage of photo optical speed sensor which is used primarily to measure the shaft rotating speed serves as a reference for measuring vibration phase information has effect on the placement of phase angle how it was misunderstood. This paper will help a right method to search for the position of balancing weight and serves as baseline for further measurements using low cost and much easier user convenience. It is concluded that the propose baseline is likely to be applicable to apply to the practical field balancing weight.