Journal ArticleDOI
Acoustic Emission Source Location Using Lamb Wave Modes
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TLDR
In this article, the dispersive nature of Lamb wave propagation in plates makes it possible to perform a linear source location of AE events based on the arrival of different frequency components (Lamb wave modes) of an AE event at a single transducer.Abstract:
This paper describes the development of a technique based on acoustic emission (AE) technology that can be used for global nondestructive evaluation (NDE) of steel structures. This will also be useful for the subsequent local inspection used to further monitor cracking, defective connections, retrofit measures, and so forth. The dispersive nature of Lamb wave propagation in plates makes it possible to perform a linear source location of AE events based on the arrival of different frequency components (Lamb wave modes) of an AE event at a single transducer. Experiments on steel beams and plates in the laboratory explored the theory of wave propagation and digital signal processing needed to pursue this objective. Subsequent field investigation on a real bridge substantiated the applicability of this technique. This new technique could allow AE inspection to locate structural problems better, and with a reduced number of transducers.read more
Citations
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Journal ArticleDOI
Smart Prestressing with Shape-Memory Alloy
Arup Maji,Ihosvany Negret +1 more
TL;DR: In this article, shape-memory effect in nickel-titanium (nitinol) alloy was successfully utilized as a way of inducing additional prestressing in concrete, where wires made with SMA wires were electrically actuated to induce deflection and failure in concrete (mortar) beams.
Journal ArticleDOI
A new method for waveform analysis for estimating AE wave arrival times using wavelet decomposition
TL;DR: In this article, a new method for determination of Acoustic emission (AE) wave arrival times for source location purposes is described, based on a simple geometry of carbon-fibre reinforced plastic.
Journal ArticleDOI
Quantification of reactivated landslide behaviour using acoustic emission monitoring
TL;DR: In this article, an approach, Assessment of Landslides using Acoustic Real-time Monitoring Systems (ALARMS) is described, and results of a field trial of sensors on an active landslide at Hollin Hill, North Yorkshire, UK, are described.
Journal ArticleDOI
Source location of acoustic emission in diesel engines
TL;DR: In this paper, two source location techniques, a traditional wave velocity-based and an energy-based technique, using triangular sensor arrays, are used to locate source positions on the cylinder head of a 74kW diesel engine using simulated sources (pencil lead break) and real sources (e.g. injectors and exhaust valves during engine running).
Journal ArticleDOI
Review on Structural Health Evaluation with Acoustic Emission
TL;DR: In this article, a review introduces several areas of importance in acoustic emission (AE) technology, starting from signal attenuation, which is a critical issue in any large-scale AE monitoring, but few systematic studies have appeared.
References
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Journal ArticleDOI
On waves in an elastic plate
TL;DR: In this article, the authors considered the problem of two-dimensional wave propagation in a solid bounded by parallel planes, and proposed a simple solution to the problem, which has no bearing on the questions referred to in this paper.
Journal ArticleDOI
Source location in thin plates using cross-correlation
TL;DR: In this paper, an alternative method to first threshold crossing for acoustic emission (AE) source location is presented for wave propagation in dispersive media, the accuracy of source location can be improved by locating corresponding phase points on the transducer outputs to determine the difference in arrival times.