Concept definition studies for the Modal Identification Experiment (MIE), a proposed space flight experiment for the Space Station Freedom (SSF), have demonstrated advantages and compatibility of free-decay time-domain modal identification techniques with the on-orbit operational constraints of large space structures. Since practical experience with modal identification using actual free-decay responses of large space structures is very limited, several numerical and test data reduction studies were conducted. Major issues and solutions were addressed, including closely-spaced modes, wide frequency range of interest, data acquisition errors, sampling delay, excitation limitations, nonlinearities, and unknown disturbances during free-decay data acquisition. The data processing strategies developed in these studies were applied to numerical simulations of the MIE, test data from a deployable truss, and launch vehicle flight data. Results of these studies indicate free-decay time-domain modal identification methods can provide accurate modal parameters necessary to characterize the structural dynamics of large space structures.
Free-decay time-domain modal identification for large space structures
AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference ; 1992 ; Dallas, TX, United States
1992-01-01
Conference paper
No indication
English
Free-Decay Time-Domain Modal Identification for Large Space Structures
Online Contents | 1994
|On-orbit modal identification of large space structures
Tema Archive | 1992
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