Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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FIV Analysis for a Rod Supported by Springs at Both Ends

  • H. S. Kang (Korea Atomic Energy Research Institute) ;
  • K. N. Song (Korea Atomic Energy Research Institute) ;
  • Kim, H. K. (Korea Atomic Energy Research Institute) ;
  • K. H. Yoon (Korea Atomic Energy Research Institute)
  • Published : 2001.12.01
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Abstract

An axial-flow-induced vibration model was proposed for a rod supported by two translational springs at both ends. For developing the model, a one-mode approximation was made based on the assumption that the first mode was dominant in vibration behavior of the single span rod. The first natural frequency and mode shape functions for the flow-induced vibration, called the FIV model were derived by using Lagrange＇s method. The vibration displacements at reactor conditions were calculated by the proposed model for the spring-supported rod and by the previous model for the simple-supported(55) rod. As a result, the vibration displacement for the spring-supported rod was larger than that of the 55 rod, and the discrepancy between both displacements became much larger as flow velocity increased. The vibration displacement for the spring-supported rod appeared to decrease with the increase of the spring constant. AS flow velocity increased, the increase rate of vibration displacement was calculated to go linearly up, and that of the rod having the short span length was larger than that of the rod having the long span length although the displacement value itself of the long span rod was larger than that of the short one.

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References

  1. M .P. Paidoussis, 'Fluidelastic Vibration of Cylinder Arrays in Axial and Cross Flow-State of the Art', J. of Sound and Vibration, 76, pp. 329-360 (1981) https://doi.org/10.1016/0022-460X(81)90516-2
  2. H.S.Kang, et al., 'A Study on the vibrational Behavior of the Fuel rods Continuously Supported by a Rotary and Bent Spring System, 'Korea Sound and Vibration Society, May 1998, pp. 454-460 (1998)
  3. H. S. Kang, et al., 'A Study on the Axial-flow-induced Vibration of Fuel Rod,' Transactions of the 15th International Conference on SMiRT, Vol. 2, pp. 341-348, Seoul, Korea, August, 15-20 (1999)
  4. R. D. Blevins, 'Flow-induced Vibration,' 2nd ed., pp. 20-25, Van Nostrand Reinhold, New York (1990)
  5. S.S. Chen and W. Wambsganss, 'Parallelflow-induced vibration of fuel rods,' Nuclear Engineering and Design 18, pp.253-278 (1972) https://doi.org/10.1016/0029-5493(72)90144-6
  6. G. M. Corcos, 'The Structure of the Turbulent Pressure Field in Boundary-layer Flows,' J. of Fluid Mechanics, Vol. 18, pp. 353-358 (1962) https://doi.org/10.1017/S002211206400026X