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On the apparent insignificance of the randomness of flexible joints on large space truss dynamicsDeployable periodic large space structures have been shown to exhibit high dynamic sensitivity to period-breaking imperfections and uncertainties. These can be brought on by manufacturing or assembly errors, structural imperfections, as well as nonlinear and/or nonconservative joint behavior. In addition, the necessity of precise pointing and position capability can require the consideration of these usually negligible and unknown parametric uncertainties and their effect on the overall dynamic response of large space structures. This work describes the use of a new design approach for the global dynamic solution of beam-like periodic space structures possessing parametric uncertainties. Specifically, the effect of random flexible joints on the free vibrations of simply-supported periodic large space trusses is considered. The formulation is a hybrid approach in terms of an extended Timoshenko beam continuum model, Monte Carlo simulation scheme, and first-order perturbation methods. The mean and mean-square response statistics for a variety of free random vibration problems are derived for various input random joint stiffness probability distributions. The results of this effort show that, although joint flexibility has a substantial effect on the modal dynamic response of periodic large space trusses, the effect of any reasonable uncertainty or randomness associated with these joint flexibilities is insignificant.
Document ID
19930046906
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Koch, R. M.
(U.S. Navy, Naval Undersea Warfare Center Newport, RI, United States)
Klosner, J. M.
(Polytechnic Univ. Farmingdale, NY, United States)
Date Acquired
August 16, 2013
Publication Date
February 1, 1993
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
AIAA PAPER 93-0979
Meeting Information
Meeting: AIAA, AHS, and ASEE, Aerospace Design Conference
Location: Irvine, CA
Country: United States
Start Date: February 16, 1993
End Date: February 19, 1993
Sponsors: AIAA, AHS, ASEE
Accession Number
93A30903
Funding Number(s)
CONTRACT_GRANT: NAG1-986
Distribution Limits
Public
Copyright
Other

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