Analysis of Crosstalk Effects of Data Acquisition Devices on Structural Health Monitoring Systems Based on Piezoelectric Transducers

• Grant number: 23/11165-2
• Support Opportunities: Scholarships in Brazil - Master
• Start date: November 01, 2023
• End date: October 31, 2025
• Field of knowledge: Engineering - Electrical Engineering
• Principal Investigator: Fabricio Guimarães Baptista
• Grantee: Guilherme Marconato Rezende
• Host Institution: Faculdade de Engenharia (FE). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil

Abstract

Data acquisition (DAQ) devices have been widely used in structural health monitoring (SHM) systems, allowing cost reduction compared to some instruments and the development of more versatile systems for the acquisition of signals from multiple transducers. A problem observed in such devices and that can affect the performance of monitoring systems is the crosstalk effect. Crosstalk is the interference between the channels of data acquisition devices and is particularly critical when multiple multiplexed acquisition channels are used. This interference, even if apparently small, can hinder the detection of incipient structural damage, which is the objective of monitoring systems. In this research, the interest is in monitoring systems based on piezoelectric transducers, such as the electromechanical impedance, guided waves, and acoustic emission methods. Due to the piezoelectric effect, when a transducer is installed in the structure to be monitored, an interaction is established between the mechanical properties of the structure and the electrical properties of the transducer. In this way, it is possible to monitor the structural health by measuring and analyzing the electrical signals from the transducer. However, crosstalk can alter the transducer's electrical signal and make it difficult to detect small structural damage. Thus, this research aims to carry out an experimental analysis of crosstalk effects on the detection of small structural damage in non-destructive methods with piezoelectric transducers mentioned above, having as focus the electromechanical impedance method. With the results obtained, it is expected to be able to relate the crosstalk effects with the parameters of the data acquisition device such as amplitude of the excitation signal, sampling rate, frequency and the influence of crosstalk on the detection of small structural damage.