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RESEARCH PAPERS

On the Evaluation of Dynamic Stresses in Pipelines Using Limited Vibration Measurements and FEA in the Frequency Domain

[+] Author and Article Information
W. A. Moussa

Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel by Drive, Ottawa, Ontario K1S 5B6, Canada

A. N. AbdelHamid

School of Sciences and Engineering, The American University in Cairo, P.O. Box 2511, Cairo, Egypt

J. Pressure Vessel Technol 121(3), 241-245 (Aug 01, 1999) (5 pages) doi:10.1115/1.2883698 History: Received November 04, 1998; Revised March 01, 1999; Online February 11, 2008

Abstract

A practical technique is investigated for the determination of dynamic stresses in pipelines through the use of finite element method (FEM) and field measurement vibrations at selected points. Numerical simulation of a harmonically loaded pipeline structure is used to establish the validity of the technique in the frequency domain. The analysis is carried out for a fixed-hinged pipe model. The results show that lack of coincidence between the vibration measurement points (VMPs) and the exciting force, or the use of only translational vibration measurements (TVMs) produce an approximate stress picture. The extent of the “error” in these cases is found to depend on the density of the VMPs and the proximity between these points and the exciting force location. A safety-related risk assessment is applied to find the minimum distance between measuring points that is needed to meet design codes reliability specifications.

Copyright © 1999 by The American Society of Mechanical Engineers
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