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Effect of Response Shape Versus Mode Shape on Prediction of Fluidelastic Instability of Tubes Partially Exposed to Crossflow: A Brief Note

[+] Author Affiliations
Frantisek L. Eisinger, Robert E. Sullivan

Foster Wheeler Power Group, Inc., Clinton, NJ

Paper No. PVP2003-2070, pp. 17-22; 6 pages
  • ASME 2003 Pressure Vessels and Piping Conference
  • Flow-Induced Vibration
  • Cleveland, Ohio, USA, July 20–24, 2003
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4156-1
  • Copyright © 2003 by ASME


Critical velocities for fluidelastic instabilities for tubes exposed to crossflow are typically predicted based on the normal vibratory mode shapes and frequencies. If the analysis is based on vibratory response shapes rather than mode shapes, significant differences can be shown to exist in the prediction for some cases. These differences tend to be more pronounced in cases of partial exposure of tubes to crossflow or non-uniform spacing of tube supports and at higher damping. A brief assessment and evaluation with two sample problems is given.

Copyright © 2003 by ASME
Topics: Shapes



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