Damage Detection Based on Power Dissipation Measured with PZT Sensors through the Combination of Electro-Mechanical Impedances and Guided Waves.

Enrique Sevillano,Ricardo Perera,Rui Sun

doi:10.3390/s16050639

Enrique Sevillano, Ricardo Perera + Show 1 more

Open Access

https://doi.org/10.3390/s16050639

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Abstract

The use of piezoelectric ceramic transducers (such as Lead-Zirconate-Titanate—PZT) has become more and more widespread for Structural Health Monitoring (SHM) applications. Among all the techniques that are based on this smart sensing solution, guided waves and electro-mechanical impedance techniques have found wider acceptance, and so more studies and experimental works can be found containing these applications. However, even though these two techniques can be considered as complementary to each other, little work can be found focused on the combination of them in order to define a new and integrated damage detection procedure. In this work, this combination of techniques has been studied by proposing a new integrated damage indicator based on Electro-Mechanical Power Dissipation (EMPD). The applicability of this proposed technique has been tested through different experimental tests, with both lab-scale and real-scale structures.

Highlights

A vast number of aerospace, civil, and mechanical infrastructures usually work under very demanding conditions, continuously subjected to both static and dynamic loads and frequently in severe environments, which can lead to either a gradual deterioration of the structure or its sudden failure
Results and Discussion verified, the Electro-Mechanical Power Dissipation (EMPD) presents different shapes depending on the sensing region, on the damage scenario, well as onguided the direction of motion of thebetween guided waves, as intwo the two previous examples, which comes and the Theasselected wave was sent every consecutive working sensors, to confirm the high sensitivity of this new indicator to the presence of damage, even when dealing with
A new damage indicator has been proposed in this paper based on Electro-Mechanical Power

Summary

Introduction

A vast number of aerospace, civil, and mechanical infrastructures usually work under very demanding conditions, continuously subjected to both static and dynamic loads and frequently in severe environments, which can lead to either a gradual deterioration of the structure or its sudden failure. Many authors have focused their research activities towards the development of these damage detection methods. All these methods are based on the definition of different strategies that allow the structural health to be assessed with the purpose of obtaining a quantification and, if possible, the location of any damage present in the structure [1]. In order to achieve this goal, the output responses of the structure to a given input excitation are analyzed before and after damage, and the definition of a baseline of the structure is first required. After collecting all the corresponding measurements, each of the damaged state measurements is compared with the defined baseline, so that every modification of the expected response of the structure can be translated into a damage indication

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