Topic
Structural health monitoring
About: Structural health monitoring is a research topic. Over the lifetime, 11727 publications have been published within this topic receiving 186231 citations.
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TL;DR: In this paper, an embedded-ultrasonics structural radar (EUSR) is proposed for in situ nondestructive evaluation and structural health monitoring (SHM) of thin-wall structures.
Abstract: Embedded-ultrasonics structural radar (EUSR) is a new concept and methodology for in situ nondestructive evaluation (NDE) and structural health monitoring (SHM) of thin-wall structures. EUSR consists of: (a) an array of piezoelectric wafer active sensors (PWAS) embedded into the structure; and (b) electronic modules for signal transmission/reception, processing, and interpretation. EUSR utilizes guided elastic waves (Lamb waves) generated omnidirectionally into the thin-wall structure by surface-mounted permanently attached PWAS. The paper starts with the general concepts of the EUSR algorithm: transmission beamforming, reception beamforming, and time-of-fight (TOF) determination. Next, details of the Lamb wave generation with PWAS, verification of group-velocity dispersion curves, identification of optimal excitation frequency, and confirmation of wave front omnidirectionality are discussed. In the third part of the paper, the actual implementation of the EUSR method in a proof-of-concept demonstration i...
229 citations
Book Chapter•
01 Nov 2012TL;DR: In this paper, the use of nonlinear-dynamics-based procedures for the purposes of structural health monitoring as well as for monitoring of robot joints is described and explained.
Abstract: This study explains and demonstrates the utilisation of different nonlinear-dynamics-based procedures for the purposes of structural health monitoring as well as for monitoring of robot joints.
223 citations
TL;DR: In this paper, the use of the electro-mechanical (E/M) impedance method for health monitoring of thin-wall aircraft panels and aerospace structures is described, which accounts for axial and flexural vibrations of the structure and considers both the structural dynamics and the sensor dynamics.
Abstract: The use of the electro-mechanical (E/M) impedance method for health monitoring of thin plates and aerospace structures is described. As a nondestructive evaluation technology, the E/M impedance method allows us to identify the local dynamics of the structure directly through the E/M impedance signatures of piezoelectric wafer active sensors (PWAS) permanently mounted to the structure. An analytical model for 2-D thin-wall structures, which predicts the E/M impedance response at PWAS terminals, was developed and validated. The model accounts for axial and flexural vibrations of the structure and considers both the structural dynamics and the sensor dynamics. Calibration experiments performed on circular thin plates with centrally attached PWAS showed that the presence of damage modifies the high-frequency E/M impedance spectrum causing frequency shifts, peak splitting, and appearance of new harmonics. Overall-statistics damage metrics and probabilistic neural network (PNN) are used to classify the spectral data and identify damage severity. On thin-wall aircraft panels, the presence of damage influences the sensors E/M impedance spectrum. When crack damage is in the PWAS medium field, changes in the distribution of harmonics take place and when crack damage is in the PWAS near field, changes in both the harmonics and the dereverberated response are observed. These effects are successfully classified with PNN and overall-statistics metrics, respectively. This proves that permanently attached PWAS in conjunction with the E/M impedance method can be successfully used in structural health monitoring to detect the presence of incipient damage through the examination and classification of the high-frequency E/M impedance spectra.
222 citations
TL;DR: In this article, the results of laboratory experiments on simply-supported beam structures demonstrate the high accuracy of the vision sensor for dense full-field displacement measurements, and the identified natural frequencies and mode shapes from measurements by using one camera match well with those from an array of accelerometers.
222 citations
TL;DR: In this paper, the local interaction simulation approach for Lamb wave propagation modelling in metallic structures is applied to analyze two-dimensional wave interactions with slot-type defects, and the results show the potential for complex modeling of acousto-ultrasonic waves in damage detection applications.
Abstract: Lamb waves have shown great potential for structural health monitoring The technique is based on guided ultrasonic waves introduced into a structure at one point and sensed at a different location Damage in a structure is identified by a change in the output signal However, previous studies show that even simple structural configurations can lead to complex response signals Therefore a knowledge and understanding of wave propagation can ease the interpretation of damage detection results This paper reports an application of the local interaction simulation approach for Lamb wave propagation modelling in metallic structures The focus of the analysis is on two-dimensional wave interactions with slot-type defects The method shows the potential for complex modelling of acousto-ultrasonic waves in damage detection applications
221 citations