Synthetic modifications in the frequency domain for finite element model update and damage detection
Konze, Ryun J.C.
Gordis, Joshua H.
Kwon, Young W.
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Sensitivity-based finite element model updating and structural damage detection has been limited by the number of modes available in a vibration test and also by the corresponding amount of natural frequency sensitivity data. The method of Artificial Boundary Conditions (ABC) has been shown to greatly increase the number of modes and corresponding sensitivity data by artificially constraining the structure under test, producing a large number of alternative test configurations and associated sensitivity data. This thesis explores an extension of this concept by the application of synthetic structural modifications to the measured data, including both springs-to-ground and mass modifications. This is accomplished with frequency domain structural synthesis. The ability of this technique to generate additional sensitivity data for use in model update and damage detection is explored and compared with the use of Artificial Boundary Conditions. Frequency response functions from a simulated damaged structure are used as well as measured frequency response functions from a lab-scale damaged structure.
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