Modeling, Simulation, Experimentation, and Compensation of Temperature Effect in Impedance-Based SHM Systems Applied to Steel Pipes.

Rothschild A Antunes,Jozue Vieira Filho,Nicolás E Cortez,Bárbara M Gianesini

doi:10.3390/s19122802

Abstract

Pipelines have been widely used for the transportation of chemical products, mainly those related to the petroleum industry. Damage in such pipelines can produce leakage with unpredictable consequences to the environment. There are different structural health monitoring (SHM) systems such as Lamb wave, comparative vacuum, acoustic emission, etc. for monitoring such structures. However, those based on piezoelectric sensors and electromechanical impedance technique (EMI) measurements are simple and efficient, and have been applied in a wide range of structures, including pipes. A disadvantage of such technique is that temperature changes can lead to false diagnoses. To overcome this disadvantage, temperature variation compensation techniques are normally incorporated. Therefore, this work has developed a complete study applied to damage detection in pipelines, including an innovative technique for compensating the temperature effect in EMI-based SHM and the modeling of piezoceramics bonded to pipeline structures using finite elements. Experimental results were used to validate the model. Moreover, the compensation method was tested in two steel pipes—healthy and damaged—compensating the temperature effect ranging from −40 °C to +80 °C, with analysis on the frequency range from 5 kHz to 120 kHz. The simulated and experimental results showed that the studies effectively contribute to the SHM area, mainly to EMI-based techniques.

Highlights

There are at least two main concerns when dealing with structures presently
There are many methods according to the stages of structural health monitoring (SHM) systems, but in the present work, the focus is the damage detection by means of the electromechanical impedance technique (EMI), which is based on low cost
Effect of Temperature on Impedance-Based Damage Detection the literature and to the analysis presented in this work, the damage detection systems based on EMI

Summary

Introduction

There are at least two main concerns when dealing with structures presently. First, the global and fast-paced growth of modern constructions, to cater to the most diverse needs of the population, demands an increasingly rigorous performance from engineering areas. Sensors 2019, 19, 2802 fluids in general, because they present lower costs when compared to terrestrial, railway, and air transport, and because they are considered safe In this sense, structural health monitoring (SHM) is an area that has been growing significantly in the last few years since industrial engineers and academic researchers are becoming increasingly concerned with the health of structures such as pipelines. Structural health monitoring (SHM) is an area that has been growing significantly in the last few years since industrial engineers and academic researchers are becoming increasingly concerned with the health of structures such as pipelines They continuously seek systems and mechanisms to monitor structural health for detecting damage and/or gas or liquid leakage, to guarantee higher safety levels to users and the environment, as well as to reduce costs [2,3,4,5]. There are many methods according to the stages of SHM systems, but in the present work, the focus is the damage detection by means of the electromechanical impedance technique (EMI), which is based on low cost

Methods

Results

Conclusion