Wave propagation-based methods are being used increasingly for damage assessment in structural components in a laboratory setting. However, there are a number of practical issues that must be addressed to transition wave propagation-based methods from the laboratory into field applications. A suite of feature extraction techniques have been developed to investigate if the effects of material damage in structural components can be detected and located using an active sensing approach. In this study, damage is defined as a local change in impedance, which can be identified by comparing the response signatures from baseline and damaged states. Damage in the form of mass, score, notch, fiber breakage and dents are successfully detected and located using the time-frequency and spatio-temporal approaches described in this work.Time responses are collected using a four channel Tektronix TDS3014B Digital Oscilloscope at a 10 MHz sample rate. Figure 7.17 Schematic setup with accelerometer and mass perturbation locations. The results from a ... A sample set of results from two sensor locations, one at the bottom of the plate (S7) and the other at the side of the tile (S6), are shown in these results. The potential for outlieranbsp;...
|Title||:||Numerical and Experimental Investigations of Practical Issues in the Use of Wave Propagation for Damage Identification|
|Publisher||:||ProQuest - 2007|