skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: VIBRATION MODES OF SPHERICAL SHELLS AND CONTAINMENT VESSELS

Abstract

No abstract prepared.

Authors:
;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
788304
Report Number(s):
LA-UR-01-5998
TRN: US0200397
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Oct 2001
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; CONTAINMENT SYSTEMS; CONTAINMENT SHELLS; SPHERICAL CONFIGURATION; OSCILLATION MODES

Citation Formats

T. A. DUFFEY, and C. ROMERO. VIBRATION MODES OF SPHERICAL SHELLS AND CONTAINMENT VESSELS. United States: N. p., 2001. Web.
T. A. DUFFEY, & C. ROMERO. VIBRATION MODES OF SPHERICAL SHELLS AND CONTAINMENT VESSELS. United States.
T. A. DUFFEY, and C. ROMERO. Mon . "VIBRATION MODES OF SPHERICAL SHELLS AND CONTAINMENT VESSELS". United States. doi:. https://www.osti.gov/servlets/purl/788304.
@article{osti_788304,
title = {VIBRATION MODES OF SPHERICAL SHELLS AND CONTAINMENT VESSELS},
author = {T. A. DUFFEY and C. ROMERO},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 2001},
month = {Mon Oct 01 00:00:00 EDT 2001}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • Spherical pressure vessels are used to fully contain the effects of high explosions. In this paper, the vibrations of a spherical containment vessel undergoing elastic response are investigated. Vibration modes of containment vessels are of particular interest, as it is the superposition and interaction of different modes of response with closely spaced frequencies that has been reported to be the mechanism of 'strain growth'. First, the modal frequencies of a spherical shell for both axisymmetric and nonaxisymmetric response modes are discussed, based on a sequence of papers that have appeared in the open literature. Analytical predictions are then compared withmore » numerical simulations using ABAQUS. It is found that the numerical simulations accurately predict both the axisymmetric and nonaxisymmetric modal frequencies for the complete spherical shell. Next, numerical simulations of modal frequencies for the more complex spherical containment vessel (with nozzles) are compared with the spherical shell results. Numerical simulations for the spherical containment vessel reveal that frequencies are somewhat similar to the complete spherical shell. Limited comparisons with experimentally recorded frequencies for participating modes of vessel dynamic response during high explosive containment testing are presented as well.« less
  • A correlation of the experimentally recorded dynamic response of a spherical containment vessel with theoretical finite element calculations is presented. Three experiments were performed on the 6-ft-diameter steel vessel using centrally located 12-lb. and 40-lb. high explosive charges. Pressure-time loading on the inner wall of the vessel was recorded for each test using pressure transducers. Resulting dynamic response of the vessel was recorded for each test using strain gages mounted at selected locations on the outer surface of the vessel. Response of the vessel was primarily elastic. A finite element model of the vessel was run using DYNA3D, a dynamicmore » structural analysis code. Pressure loading for the finite element model was based on results from a one-dimensional reactive hydrodynamics code. Correlations between experiments and analysis were generally good for the tests for frequency and strain magnitude at most locations. Comparisons of experimental and calculated pressure-time histories were less satisfactory.« less
  • A correlation of the experimentally recorded dynamic response of a spherical containment vessel with theoretical finite element calculations is presented. Three experiments were performed on the 6-ft-diameter steel vessel using centrally located 12-lb. and 40-lb. high explosive charges. Pressure-time loading on the inner wall of the vessel was recorded for each test using pressure transducers. Resulting dynamic response of the vessel was recorded for each test using strain gages mounted at selected locations on the outer surface of the vessel. Response of the vessel was primarily elastic. A finite element model of the vessel was run using DYNA3D, a dynamicmore » structural analysis code. Pressure loading for the finite element model was based on results from a one-dimensional reactive hydrodynamics code. Correlations between experiments and analysis were generally good for the tests for frequency and strain magnitude at most locations. Comparisons of experimental and calculated pressure-time histories were less satisfactory.« less
  • Analytical models have been developed that can be used to investigate the vibration modes that exist in small air-conditioning units and to obtain a clearer understanding of the influence of gyroscopic effects on these vibration modes. Techniques have been developed that can be used to determine the values of the mass and stiffness coefficients in the analytical models from measured data. The analytical model that incorporated the effects of the gyroscopic moment associated with the fan impeller indicated the gyroscopic moment resulted in forward and backward fan impeller whirling modes. These modes were associated with each of the rocking andmore » swaying vibration modes that existed in the two air-conditioning units examined during this project. The correlation between the measured and calculated system resonance frequencies associated with specific vibration modes was very good.« less