Evaluation of the E/M Impedance Method as a SHM Technique for Large Civil Aircraft Spoilers: Analytical, Numerical and Experimental Studies Performed with Simple Structures

Viechtbauer, Christoph; Erlinger, Thomas; Schagerl, Martin

doi:10.12783/shm2015/92

Cited by 2 publications

(3 citation statements)

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“…The E/M impedance method is a vibration based structural inspection method. Its measure is the impedance of a E/M system, consisting of one [2,5] or more [7] Piezoelectric Wafer Active Sensors (PWAS) bonded to the mechanical structure of interest. The PWAS is used to excite the E/M system and at the same time to measure its frequency response in form of the piezoelectric elements impedance…”

Section: Fundamentals Of the E/m Impedance Methodsmentioning

confidence: 99%

“…The E/M impedance method is on the one hand side cheap and comparatively simple in use and on the other hand side shown, e.g. by Giurgiutiu [2,3,4,5,6], to be able to monitor damages in simple structures up to level 3. The main motivation of the present work is to investigate the E/M impedance method as a possible SHM method for the detection of face layer debonding in composite sandwich structures like e.g.…”

Section: Introductionmentioning

confidence: 99%

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Electro-Mechanical Impedance Measurements as a Possible SHM Method for Sandwich Debonding Detection

Kralovec

Schagerl

2017

KEM

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The present article addresses the evaluation of the electro-mechanical (E/M) impedance method as a Structure Health Monitoring (SHM) method to detect and classify damage, more specific, the debonding of a face layer.In the study the considered structure is simplified as a circular sandwich panel of constant thickness, consisting of isotropic face layers and a honeycomb core.The debonding is assumed to be circular and situated at the center of the panel, only variable in its radius.The article starts with a brief introduction to the basic idea of SHM and the fundamentals of the E/M impedance method.Further, the idealized setting is investigated by two sets of experiments whose results are analyzed by typically used damage metrics and by considering both analytical and numerical models.A coupled-field FEM model is developed and compared to the experimental results.Furthermore, an analytical model is derived to evaluate the experimental and numerical results.All results are presented and discussed extensively on pursuing the objective to detect and classify the size of a debonding.Finally, it is shown how a model based approach can predict the presence but also the size of a debonding in the considered sandwich panels based on the E/M impedance measurements.

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Section: Fundamentals Of the E/m Impedance Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electro-Mechanical Impedance Measurements as a Possible SHM Method for Sandwich Debonding Detection

Kralovec

Schagerl

2017

KEM

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“…The electro-mechanical impedance (EMI) method is a vibration-based structural inspection method. Its measure is the impedance of a E/M system, consisting of one [58,59] or more [60] piezoelectric wafer active sensors (PWAS) bonded to the mechanical structure of interest. The PWAS is used to excite the E/M system and at the same time to measure its frequency response in the form of the piezoelectric element's impedance…”

Section: Vibration Analyses With Electro-mechanical Impedance Methodsmentioning

confidence: 99%

Review of Structural Health Monitoring Methods Regarding a Multi-Sensor Approach for Damage Assessment of Metal and Composite Structures

Kralovec

Schagerl

2020

Sensors

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Structural health monitoring (SHM) is the continuous on-board monitoring of a structure’s condition during operation by integrated systems of sensors. SHM is believed to have the potential to increase the safety of the structure while reducing its deadweight and downtime. Numerous SHM methods exist that allow the observation and assessment of different damages of different kinds of structures. Recently data fusion on different levels has been getting attention for joint damage evaluation by different SHM methods to achieve increased assessment accuracy and reliability. However, little attention is given to the question of which SHM methods are promising to combine. The current article addresses this issue by demonstrating the theoretical capabilities of a number of prominent SHM methods by comparing their fundamental physical models to the actual effects of damage on metal and composite structures. Furthermore, an overview of the state-of-the-art damage assessment concepts for different levels of SHM is given. As a result, dynamic SHM methods using ultrasonic waves and vibrations appear to be very powerful but suffer from their sensitivity to environmental influences. Combining such dynamic methods with static strain-based or conductivity-based methods and with additional sensors for environmental entities might yield a robust multi-sensor SHM approach. For demonstration, a potent system of sensors is defined and a possible joint data evaluation scheme for a multi-sensor SHM approach is presented.

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Evaluation of the E/M Impedance Method as a SHM Technique for Large Civil Aircraft Spoilers: Analytical, Numerical and Experimental Studies Performed with Simple Structures

Cited by 2 publications

References 0 publications

Electro-Mechanical Impedance Measurements as a Possible SHM Method for Sandwich Debonding Detection

Electro-Mechanical Impedance Measurements as a Possible SHM Method for Sandwich Debonding Detection

Review of Structural Health Monitoring Methods Regarding a Multi-Sensor Approach for Damage Assessment of Metal and Composite Structures

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