NDLI: Development of technology for fluid-structure interaction modeling of a 1/8-scale dynamic model of shuttle external tank (et). volume i: technical report

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Development of technology for fluid-structure interaction modeling of a 1/8-scale dynamic model of shuttle external tank (et). volume i: technical report

Content Provider	NASA Technical Reports Server (NTRS)
Author	Bernstein, M. Coppolino, R. Mason, P. W. Zalesak, J.
Copyright Year	1974
Description	A NASTRAN analysis of the external tank (ET) substructure of the 1/8-scale space shuttle structural dynamics model is described. The NASTRAN hydroelastic procedures were used to form a model of the liquid oxygen portion of the ET. Large computer storage requirements and running times were required unless these procedures were modified. Several possibilities were demonstrated including the substitution of the real for the complex eigenvalue routine and the use of the OMIT capability to reduce the number of fluid coordinates. A NASTRAN model of the complete ET was formed and reduced to 252 degrees of freedom. A review of the eigenvector extracted, using the unsymmetrical inverse power method, indicated that the structural OMIT's resulted in unsatisfactory modal deflections. Modifications to the NASTRAN hydroelastic capability appeared necessary to generate a successful ET model. An approach is described which, by assuming incompressibility, reduces the fluid representation to a symmetric mass matrix which can be added to the structural mass. The problem is solved using faster and more efficient eigenvalue routines. Using this approach the ET NASTRAN model was analyzed for three separate weight conditions.
File Size	13533670
Page Count	170
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19750013287
Archival Resource Key	ark:/13960/t3kx05r7h
Language	English
Publisher Date	1974-08-01
Access Restriction	Open
Subject Keyword	Spacecraft Propulsion And Power Hydroelasticity Space Shuttles Dynamic Models External Stores Spacecraft Configurations Computer Programs Structural Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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