ISS Stage 12A Post-Flight Modal Analysis, Model Validation and CorrelationThis paper summarizes the on-orbit structural dynamic data and the related modal analysis, model validation and correlation performed for the ISS configurations spanning ISS Stage 12A. The objective of this analysis is to validate and correlate analytical models used to verify the ISS critical interface dynamic loads and improve its fatigue life prediction. On-Orbit dynamic responses were measured during the ISS configurations throughout ISS Stage 12A by the two main ISS instrumentation systems; Internal Wireless Instrumentation System (IWIS) and the Structural Dynamic Measurement System (SDMS). These nominal on-orbit events include Russian vehicle docking and undockings. Also, the ISS photogrammetric system recorded the movements of the 2A and 4A solar arrays during a modified ISS maneuver. Modal analyses were performed on the measured data to extract modal parameters including frequency, damping and mode shapes. Correlation and comparisons between the test and analytical frequencies and mode shapes were performed to assess the accuracy of the analytical models for the ISS configurations under consideration.
Document ID
20090001324
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Fitzpatrick, Kristin (Boeing Co. Houston, TX, United States)
Grygier, Michael (NASA Johnson Space Center Houston, TX, United States)
Bartkowicz, Ted (Boeing Co. Houston, TX, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2009
Publication Information
Publisher: Society for Experimental Mechanics, Inc.