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Results from the Middeck 0-gravity Dynamics ExperimentThe experimental results of the Middick Zero-gravity Dynamics Experiment (MODE) are presented. MODE investigated the dynamics of two key spacecraft components; contained fluids and jointed truss structures. The change in the lateral slosh behavior of contained fluids and the changes in the modal parameters of space structural test articles from one- to zero-gravity were studied. The experimental apparatus used to determine the dynamic characteristics is described. For the MODE fluid experiments, the forced response characteristics of silicone oil and distilled water in cylinder tanks with either a flat or spherical bottom are reported and discussed. A comparison of the measured earth and space results identifies and highlights the effects of gravity on the linear and nonlinear slosh behavior of these fluids. For the MODE structural experiments, an analytic and experimental study is presented. Deployable, erectable, and rotary modules were assembled to form three one- and two-dimensional structures in which variations in bracing wire and rotary joint preload could be introduced. Analysis is compared with ground experimental measurements made on a spring/wire suspension system with a nominal plunge frequency of one Hertz, and with measurements made on the Shuttle middeck. The degree of change in linear modal parameters as well as the change in nonlinear nature of the response is examined. Trends in modal parameters are presented as a function of force amplitude, joint preload, and ambient gravity level.
Document ID
19950048794
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Van Schoor, M. C.
(Pretoria Univ. Pretoria, South Africa)
Crawley, E. F.
(Massachusetts Inst. of Tech., Cambridge, MA US, United States)
Miller, D. W.
(Massachusetts Inst. of Tech., Cambridge, MA US, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publisher: American Astronautical Society (Advances in the Astronautical Sciences, Vol. 81)
ISSN: 0065-3438
Subject Category
Space Transportation
Accession Number
95A80393
Funding Number(s)
CONTRACT_GRANT: NAGW-2014
CONTRACT_GRANT: NAGW-1335
CONTRACT_GRANT: NAS1-18690
Distribution Limits
Public
Copyright
Other

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