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An Imaging Method for Impact Damage Localization Using Metal-Core Piezoelectric Fiber Rosettes

C. ZHANG, J. QIU, S. SHAN, Y. WU, N. HU

Abstract


As a novel piezoelectric device with small size, Metal-core Piezoelectric Fiber (MPF) has great potential to be used as a structurally integrated transducer for guided-wave structural health monitoring (SHM). Compared with traditional piezoelectric transducers, MPF exhibits unique directivity in Lamb wave sensing which can help to locate the direction of the impact damage without any information about time of flight or speed of propagation. This paper introduces a MPF rosette which contains three MPFs with the angle 120˚ between adjacent MPFs. To simplify the integration process to structure and improve the performance of the MPF rosette, a method of packaging the MPF rosette is presented. By coupling the piezoelectric effect to the wave strain field, the directivity of the MPF is derived. In order to determine the direction of an incoming wave, the traditional algorithm measures the amplitudes of MPFs and calculates the wave direction by rosette principles. However, the calculated wave direction is very sensitive to the measurement data which has unavoidable noise and dispersive effect in actual application. To improve the accuracy, a new method which combines an imaging method with the rosette approach is proposed. Its accuracy is validated by experiments and the phenomena in experiments are also discussed.

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