Part I describes an intelligent acoustic emission locator, while Part II discusses blind source separation, time delay estimation and location of two continuous acoustic emission sources. Acoustic emission (AE) analysis is used for characterization and location of developing defects in materials. AE sources often generate a mixture of various statistically independent signals. A difficult probl...

The acoustic emission (AE) signals of metal materials have been widely used to identify the deformation stage of a pressure vessel. In this work, Q235 steel samples with different propagation distances and geometrical structures are stretched to get the corresponding acoustic emission signals. Then the obtained acoustic emission signals are de-noised by empirical mode decomposition (EMD), and t...

the objective of this experimental work was to assess the drop impact damage onwoven glass fibre reinforced polymer composite laminate through online method and offlinemethod. online monitoring of drop impact damage was carried out by acoustic emission (ae)technique and ae signals during the drop impact test were captured. from the analysis of aesignals, it was observed that as the impact energ...

Vibro-acoustography is an ultrasound based imaging modality that can visualize normal and abnormal soft tissue through mapping the acoustic response of the object to a harmonic radiation force at frequency Δf induced by focused ultrasound. In this method, the ultrasound energy is converted from high ultrasound frequencies to a low acoustic frequency (acoustic emission) that is often two orders ...

The present paper describes the basic principles of acoustic emission (AE) tomography. This method uses acoustic emission events as point sources and combines the usual iterative localization algorithm of AE testing with algorithms for travel time tomography like ART (algebraic reconstruction technique). The procedure is equivalent to the solution of the generalized inverse localization problem...

Acoustic emission activity produced by unrestrained drying shrinkage of an early age normal strength concrete specimen was measured with an array of fourteen broad-band high-fidelity acoustic emission sensors. The specimen was continuously monitored for 17 days, and full waveforms of the acoustic emissions were recorded throughout this time period. We present the source locations in three dimen...