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Multi-Mode Guided Waves based Reference-Free Damage diagnostic imaging in Plates

Structural Durability & Health Monitoring 2019年第1期13卷 41-59页

作者： Jiaqi Zhang Kehai Liu Chang Gao Zhanjun Wu Yuebin Zheng Dongyue Gao State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian116024China School of Civil Engineering Dalian University of TechnologyDalian116024China School of Aeronautics and Astronautics Sun Yat-sen UniversityGuangzhou510275China

probability-based diagnostic imaging(PDI)is one of the most well-known damage identification methods using guided *** is usually applied to diagnose damage in *** previous studies were dependent on the certain damage index(DI)which is always calculated from the guided wave *** conventional methods,DI is simply defined by comparing the real-time data with the baseline data as ***,the baseline signal is easily affected by varying environmental conditions of *** this paper,a reference-free diagnostic imaging method is developed to avoid the influence of environmental factors,such as temperature and load *** DI is defined based on the mode conversion of multi-mode guided waves with realtime signals without baseline *** improve the accuracy of diagnosis,two terms are included in the reference-free *** is called energy DI,which is defined based on the feature of signal *** other is called correlation DI and is defined based on the correlation *** the PDI algorithm can be carried out instantaneously according to the reference-free *** real-time signals which are used to calculate DI are collected by the piezoelectric lead zirconate titanate(PZT)transducers placed on both sides of a *** numerical simulations by the finite element(FE)method on aluminum plates with PZT arrays are performed to validate the effectiveness of the reference-free damage diagnostic *** approach is validated by two different arrays:a circle network and a square *** results of diagnostic imaging are demonstrated and discussed in this ***,the advantage of reference-free DI is investigated by comparing the accuracy of defined reference-free DI and energy DI.

关键词： Multi-mode guided waves probability-based diagnostic imaging referencefree mode conversion

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