한국소음진동공학회논문집 (Transactions of the Korean Society for Noise and Vibration Engineering)

  • 제23권1호
  • /
  • Pages.65-72
  • /
  • 2013
  • /
  • 1598-2785(pISSN)
  • /
  • 2287-5476(eISSN)
한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
권호 표지
DOI QR코드

DOI QR Code

대형 입형펌프 운전 중 공진현상의 진동 저감을 위한 스티프너 설계 및 성능 검증

Design of Stiffeners for Reducing Resonant Vibration of Large Vertical Pumps and Its Performance Verification

  • 투고 : 2012.10.05
  • 심사 : 2012.12.04
  • 발행 : 2013.01.20
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

참고문헌

  1. Ryu, K. S., Roh, C. W. and Han, S. W., 2011, Maintenance Engineering Report, KEPCO KPS.
  2. Ewins, D. J., 1984, Modal Testing: Theory and Practice, Research Studies Press, pp. 87-152.
  3. Lee, J. M., 1998, Theory and Application of Modal Analysis, Seoul National University, pp. 6-1-6-13.
  4. Donald, E. Bently with Charles T. Hatch, Edited by Bob Grissom, 2002, Fundamentals of Rotating Machinery Diagnostics, Bently Pressurized Bearing Press, pp. 209-272.
  5. Song, A. H., Song, J. D., Kim, H. S. and Jung, G. C., 2012, A Case Study on Vibration of Vertical Pumps According to Changing Water, Proceedings of the KSNVE Annual Spring Conference, pp. 274-278.
  6. Choi, W. H., Yang, B. S., Joo, H. J., Son, H. S. and Noh, C. W., 1994, Vibration Problems of Large Vertical Pumps, Proceedings of the KSNVE Annual Spring Conference, pp. 148-153.
  7. Choi, W. H. and Yang, B. S., 1994, Reed Resonance Problem of Large Vertical Pumps, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 4, No. 4, pp. 425-433.
  8. ASME, 1992, Design Fatigue Curves for Carbon, Low Alloy and High Tensile Steels for Metal, Section III Division I Appendix, pp. 5-6.