ESDU 88022:2011

$126.75

Pipeline Vibrations Undamped Natural Vibration of Pipelines

Published By	Publication Date	Number of Pages
ESDU	2011-06	NA

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Category: ESDU

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Description

ESDU 88022 provides graphical data and introduces a program in
Fortran, provided as an executable file, for the estimation of the
natural vibration characteristics of non-rigid planar piping
systems, either empty or running full. The program calculates
natural frequencies and corresponding mode shapes, and normal-mode
generalised masses and stiffnesses of the transverse bending and
axial modes of vibration, up to a chosen cut-off frequency. Lumped
masses, to model in-line valves for example, and externally-acting
elastic restraints in the plane of the system may be treated. The
effects of bend flexibility may be included. The pipes may vary in
cross-section, or be of different materials, but the fluid is
assumed of constant density. The graphical data allow the
estimation of the fundamental frequency of a single pipe, or of
configurations with up to three right angle bends, subject to
additional idealisations over those imposed by the computer model.
Worked examples illustrate the use of both methods. The program is
also provided compiled to run under PC DOS in the ESDU view
user-friendly shell that prompts for the input data.