20 April 2012 Vibration-based monitoring to detect mass changes in satellites
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Vibration-based structural health monitoring could be a useful form of determining the health and safety of space structures. A particular concern is the possibility of a foreign object that attaches itself to a satellite in orbit for adverse reasons. A frequency response analysis was used to determine the changes in mass and moment of inertia of the space structure based on a change in the natural frequencies of the structure or components of the structure. Feasibility studies were first conducted on a 7 in x 19 in aluminum plate with various boundary conditions. Effect of environmental conditions on the frequency response was determined. The baseline frequency response for the plate was then used as the basis for detection of the addition, and possibly the location, of added masses on the plate. The test results were compared to both analytical solutions and finite element models created in SAP2000. The testing was subsequently expanded to aluminum alloy satellite panels and a mock satellite with dummy payloads. Statistical analysis was conducted on variations of frequency due to added mass and thermal changes to determine the threshold of added mass that can be detected.
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Arup Maji, Arup Maji, Breck Vernon, Breck Vernon, } "Vibration-based monitoring to detect mass changes in satellites", Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 83481G (20 April 2012); doi: 10.1117/12.918108; https://doi.org/10.1117/12.918108

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