Damage Detection Using Electromechanical Impedance Technique Combined with Scanning Laser Vibrometry

2013 ◽  
Vol 569-570 ◽  
pp. 687-694
Author(s):  
Szymon Opoka ◽  
Pawel Malinowski ◽  
Tomasz Wandowski ◽  
L. Skarbek ◽  
Wieslaw Ostachowicz
Keyword(s):  
Moisture Content ◽  
Damage Detection ◽  
Scanning Laser ◽  
Laser Vibrometry ◽  
Electromechanical Impedance ◽  
Impedance Technique ◽  
Vibrational Characteristics ◽  
Scanning Laser Vibrometry

The paper consists of two parts. First, Electromechanical Impedance (EMI) method is proven to be able to determine some vibrational characteristics of the investigated structure. In order to verify this statement, Scannig Laser Vibrometry (SLV) is used to correlate frequency peaks of velocity (or displacement) operational deflection shapes with corresponding ones obtained by EMI method. Finally, the influence of moisture content in CFRP sample on resonance peaks is investigated using EMI method. Damage detection indicator in this case is based on shifts of resonant peaks.

Method for removing temperature effect in impedance-based structural health monitoring systems using polynomial regression

2020 ◽  
pp. 147592172091712 ◽  
Author(s):  
Bárbara M Gianesini ◽  
Nicolás E Cortez ◽  
Rothschild A Antunes ◽  
Jozue Vieira Filho
Keyword(s):  
Structural Health Monitoring ◽  
Damage Detection ◽  
Temperature Effect ◽  
Health Monitoring ◽  
Monitoring Systems ◽  
Electromechanical Impedance ◽  
Structural Health ◽  
Detection Systems ◽  
Impedance Technique ◽  
Health Monitoring Systems

Structural health monitoring systems are employed to evaluate the state of structures to detect damage, bringing economical and safety benefits. The electromechanical impedance technique is a promising damage detection tool since it evaluates structural integrity by only measuring the electrical impedance of piezoelectric transducers bonded to structures. However, in real-world applications, impedance-based damage detection systems exhibit strong temperature dependence; therefore, variations associated with temperature changes may be confused as damage. In this article, the temperature effect on the electrical impedance of piezoelectric ceramics attached to structures is analyzed. Besides, a new methodology to compensate for the temperature effect in the electromechanical impedance technique is proposed. The method is very general since it can be applied to nonlinear (polynomial) temperature and/or frequency dependences observed on the horizontal and vertical shifts of the impedance signatures. A computer algorithm that performs the compensation was developed, which can be easily incorporated into real-time damage detection systems. This compensation technique is applied successfully to two aluminum beams and one steel pipe, minimizing the effect of temperature variations on damage detection structural health monitoring systems in the temperature range from −40°C to 80°C and the frequency range from 10 to 90 kHz.

scholarly journals Synchronized-scanning laser vibrometry

2004 ◽  
Author(s):  
Benjamin J. Halkon ◽  
Steve J. Rothberg
Keyword(s):  
Scanning Laser ◽  
Laser Vibrometry ◽  
Scanning Laser Vibrometry

Reconstructing two-dimensional acoustic object fields by use of digital phase conjugation of scanning laser vibrometry recordings

2003 ◽  
Vol 42 (29) ◽  
pp. 5831 ◽  
Author(s):  
Lothar Zipser ◽  
Heinz Franke ◽  
Erik Olsson ◽  
Nils-Erik Molin ◽  
Mikael Sjödahl
Keyword(s):  
Phase Conjugation ◽  
Scanning Laser ◽  
Two Dimensional ◽  
Laser Vibrometry ◽  
Digital Phase ◽  
Scanning Laser Vibrometry
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