A practical technique for quantifying the performance of acoustic emission systems on plate-like structures

Scholey, Jonathan J.; Wilcox, Paul D.; Wisnom, Michael R; Friswell, Michael I.

doi:10.1016/j.ultras.2009.02.001

Cited by 14 publications

(8 citation statements)

References 14 publications

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“…Arrival time is the instant a signal crosses a preset threshold value. This threshold amplitude is an important parameter in AE studies as it describes the point at which the system starts recording the signal waveform 11. It has to be added here that threshold values are often set in order to remove as much low‐amplitude noises as possible, but care must be taken so that no genuine signals are missed.…”

Section: Motivation Of the Studymentioning

confidence: 99%

Identification of acoustic emission wave modes for accurate source location in plate-like structures

Kaphle

Tan

Thambiratnam

et al. 2010

Struct. Control Health Monit.

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Acoustic emission (AE) technique is a popular tool used for structural health monitoring of civil, mechanical and aerospace structures. It is a non-destructive method based on rapid release of energy within a material by crack initiation or growth in the form of stress waves. Recording of these waves by means of sensors and subsequent analysis of the recorded signals convey information about the nature of the source. Ability to locate the source of stress waves is an important advantage of AE technique; but as AE waves travel in various modes and may undergo mode conversions, understanding of the modes ('modal analysis') is often necessary in order to determine source location accurately. This paper presents results of experiments aimed at finding locations of artificial AE sources on a thin plate and identifying wave modes in the recorded signal waveforms. Different source locating techniques will be investigated and importance of wave mode identification will be explored. 1 1 0 87 98 21 July 1 M. KAPHLE ET AL.

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Section: Motivation Of the Studymentioning

confidence: 99%

Identification of acoustic emission wave modes for accurate source location in plate-like structures

Kaphle

Tan

Thambiratnam

et al. 2010

Struct. Control Health Monit.

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“…Moreover, there is a significant challenge for a reliable AE based SHM system for composite structures due to the anisotropic nature of the materials. Much research has been undertaken to create more reliable quantitative AE for the SHM of composite structures (Scholey et al, 2010;Scholey et al, 2009). A recent study proved modal acoustic emission (MAE) to be the preferred method for source location detection and failure characterization.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Acoustic Emission Signal Attenuation for Monitoring of Progressive Failure in Fiberglass Reinforced Composite Laminates

Hafizi¹,

Epaarachchi²,

Lau³

2013

Int J Automot Mech Eng

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Glass fiber reinforced polymer (GFRP) laminates have a high damping characteristic which can retard ultra-high frequency guided wave signals from propagating along the plate. Owing to this, the identification of an effective area for sensor location is essential. Appropriate signal processing, including wavelet analysis was done, in order to observe the details of an acoustic emission (AE) signal which was emitted at a distance from it source. This study reveals that it is necessary to consider the near field and far field effects of AE signal attenuation, in particular, to determine a composite's micro failure characterization. Consequently, this attenuation behavior was used to develop the non-velocity based source mapping to monitor the progressive failure in composite laminates. This paper details the outcomes of the signal energy attenuation method with an improved algorithm for progressive failure monitoring in fiberglass reinforced composite laminates and the 'effective length' for better AE detection.

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“…They provide a numerical method of calculating the transient displacement response at any point on the surface for five different types of point source at the surface or interior of the plate. Scholey et al [10] have pointed out that an efficient alterative to trying to model the entire wave field resulting from a given source waveform is to use ray tracing, which essentially considers the wave energy that interacts with a single point of interest (ie a sensor). They then go on to identify the components of the transfer function of the frequency spectrum at the sensor from that of the source as the product of transfer functions that account for phase delay due to propagation, attenuation, beam spreading, reflection and transmission.…”

Section: Introductionmentioning

confidence: 99%

Predicting acoustic emission attenuation in small steel blocks using a ray tracing technique

El-Shaib¹,

Reuben²,

Lim³

2012

Insight

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A practical technique for quantifying the performance of acoustic emission systems on plate-like structures

Cited by 14 publications

References 14 publications

Identification of acoustic emission wave modes for accurate source location in plate-like structures

Identification of acoustic emission wave modes for accurate source location in plate-like structures

An Investigation of Acoustic Emission Signal Attenuation for Monitoring of Progressive Failure in Fiberglass Reinforced Composite Laminates

Predicting acoustic emission attenuation in small steel blocks using a ray tracing technique

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