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Nonlinear Reduced-Order Analysis with Time-Varying Spatial Loading Distributions

Author
Prezekop, Adam
Published
April 07, 2008.
Physical Description
1 electronic document
Online Version

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Summary
Oscillating shocks acting in combination with high-intensity acoustic loadings present a challenge to the design of resilient hypersonic flight vehicle structures. This paper addresses some features of this loading condition and certain aspects of a nonlinear reduced-order analysis with emphasis on system identification leading to formation of a robust modal basis. The nonlinear dynamic response of a composite structure subject to the simultaneous action of locally strong oscillating pressure gradients and high-intensity acoustic loadings is considered. The reduced-order analysis used in this work has been previously demonstrated to be both computationally efficient and accurate for time-invariant spatial loading distributions, provided that an appropriate modal basis is used. The challenge of the present study is to identify a suitable basis for loadings with time-varying spatial distributions. Using a proper orthogonal decomposition and modal expansion, it is shown that such a basis can be developed. The basis is made more robust by incrementally expanding it to account for changes in the location, frequency and span of the oscillating pressure gradient.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20080015743.
AIAA Paper 2008-2323.
LF99-5632.
49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference; 7-10 Apr. 2008; Schaumburg, IL; United States.
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Copyright, Distribution as joint owner in the copyright.
View MARC record | catkey: 15999943