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Transfer Impedance Approach to Damage Detection and Localization Based on RAPID Imaging Algorithm



One of the ideas for structural health monitoring (SHM) systems built is based on analysis of small displacements propagation excited in the element by a network of PZT piezoelectric actuators. Structural damages can result in observable changes of the signal generated by the network sensors, due to elastic wave interaction with damage. The electromechanical impedance (EMI) method approach to SHM, harmonic excitation of PZT is used, thus steady elastic waves are excited in the structure. The signal can be gather in the pulse – echo scheme, i.e. when single transducer is used both as a actuator and the receiver of waves, as well in the pitch – catch scheme, when a pair of transducers, the generator and the sensor, are used. For the latter EMI approach, the term Transfer Impedance Approach is sometimes used. In the paper, an approach for damage detection and localization with use of network of PZT sensors excited with harmonic signals in broad frequency spectrum is presented. In particular, some signal characteristics – called Damage Indices (DI’s) used for structure assessment are proposed and their properties are discussed. The DI’s have the property to assess the location a damage with respect to a single sensing path, formed by a pair of transducers, i.e. the generator and the receiver. Finally, the RAPID algorithm for damage localization with use of the information from all of the network sensing paths is applied.

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