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Finite element analysis of fluid-filled elastic piping systemsTwo finite element procedures are described for predicting the dynamic response of general 3-D fluid-filled elastic piping systems. The first approach, a low frequency procedure, models each straight pipe or elbow as a sequence of beams. The contained fluid is modeled as a separate coincident sequence axial members (rods) which are tied to the pipe in the lateral direction. The model includes the pipe hoop strain correction to the fluid sound speed and the flexibility factor correction to the elbow flexibility. The second modeling approach, an intermediate frequency procedure, follows generally the original Zienkiewicz-Newton scheme for coupled fluid-structure problems except that the velocity potential is used as the fundamental fluid unknown to symmetrize the coefficient matrices. From comparisons of the beam model predictions to both experimental data and the 3-D model, the beam model is validated for frequencies up to about two-thirds of the lowest fluid-filled labor pipe mode. Accurate elbow flexibility factors are seen to be crucial for effective beam modeling of piping systems.
Document ID
19840007532
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Everstine, G. C.
(Naval Ship Research and Development Center Bethesda, MD, United States)
Marcus, M. S.
(Naval Ship Research and Development Center Bethesda, MD, United States)
Quezon, A. J.
(Naval Ship Research and Development Center Bethesda, MD, United States)
Date Acquired
August 12, 2013
Publication Date
November 1, 1983
Publication Information
Publication: COSMIC 11th NASTRAN User's Colloq.
Subject Category
Structural Mechanics
Accession Number
84N15600
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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