Parametric studies of coupled vibration of cylindrical pipes conveying fluid with the wave propagation approach

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

The wave propagation approach is extended to the coupled frequency analysis of finite cylindrical pipes conveying dense fluid. The downstream, upstream and mixed frequencies of the pipe are defined and discussed. The effects of fluid and shell parameters on the coupled frequencies are investigated. The difference between the coupled and uncoupled frequencies decreases with the circumferential mode n, but increases with the mode n after the number n where the fundamental frequency is obtained. The fundamental frequency can change from one circumferential mode to another circumferential mode with the h/R ratios. However for a shorter shell the fundamental frequency may keep with the same mode n in the interested h/R ratios. For different boundary conditions the transition of fundamental frequency between circumferential modes occurs at different h/R ratios. The downstream frequency increases with increasing fluid velocity, whereas the upstream frequency decreases as the fluid velocity increases. However, the mixed frequency of the pipe decreases with the increase of the fluid velocity. For a given flow velocity all the three frequencies decrease with decreasing h/R ratios. However the mixed frequency drops more with increasing fluid velocity at small h/R ratios than at large h/R ratios. Therefore negative frequencies may occur for small h/R ratios if the fluid velocity is large enough, which means that instability occurs first for thinner pipes.

Original languageEnglish (US)
Pages (from-to)287-295
Number of pages9
JournalComputers and Structures
Volume80
Issue number3-4
DOIs
StatePublished - Feb 2002

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Conveying
Wave propagation
Wave Propagation
Vibration
Pipe
Fluid
Fluids
Fundamental Frequency
Decrease
Shell
Flow velocity
Frequency Analysis
Boundary conditions

Keywords

  • Coupled vibration
  • Cylindrical pipes
  • Fluid conveying
  • Frequency analysis
  • Parametric study
  • Wave propagation

ASJC Scopus subject areas

  • Computer Science Applications
  • Computational Mechanics

Cite this

Parametric studies of coupled vibration of cylindrical pipes conveying fluid with the wave propagation approach. / Zhang, Xiaoming.

In: Computers and Structures, Vol. 80, No. 3-4, 02.2002, p. 287-295.

Research output: Contribution to journalArticle

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