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Nonlinear Reduced-Order Analysis with Time-Varying Spatial Loading DistributionsOscillating 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.
Document ID
20080015743
Document Type
Conference Paper
Authors
Prezekop, Adam
(National Inst. of Aerospace Hampton, VA, United States)
Date Acquired
August 24, 2013
Publication Date
April 7, 2008
Subject Category
Acoustics
Report/Patent Number
LF99-5632
AIAA Paper 2008-2323
Meeting Information
Meeting: 49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Location: Schaumburg, IL
Country: United States
Start Date: April 7, 2008
End Date: April 10, 2008
Sponsors: American Inst. of Aeronautics and Astronautics, American Society for Composites, American Society of Mechanical Engineers, American Helicopter Society, Inc., American Society of Civil Engineers
Distribution Limits
Public
Copyright
Public Use Permitted.
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