acoustic emission


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acoustic emission

[ə′küs·tik ē′mish·ən]
(acoustics)
The phenomenon of transient elastic-wave generation due to a rapid release of strain energy caused by a structural alteration in a solid material. Also known as stress-wave emission.
References in periodicals archive ?
Acoustic emission is defined by the American Society For Testing And Materials (ASTM) as "the class of phenomena whereby transient elastic waves are generated by the rapid release of energy by a localized source or sources within a material, or the elastic waves so generated.
As the signal level will be highest close to the leak and lower the farther it is away, these upstream and downstream figures will be lower if the valve is truly the source of the acoustic emission.
The calibration of acoustic emission transducers is defined by the standard E1106-86 [8].
Taking the accumulated number of acoustic emission events [[dela].
The acoustic emission method is used in studies of friction surfaces and wear of composite materials.
Diagram of the acoustic emission measuring system applied to the loaded beam (1) is shown in Fig.
For the method just described, an analysis of the uncertainty of values of acoustic emission transducer sensitivity (6) was published in 1982.
The standard deviation, the skewness, the kurtosis, the counted number and the power spectrum ratio of the acoustic emission signals are applied to identify the chip form via the neural network.
When I had a proper job as a research engineer with Rover, acoustic emission monitoring was one technique I specialised in.
An acoustic emission apparatus utilizing microphones as noise detection sensors was used to detect the noise signals.

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