Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 206 for “"acoustic emission"”.
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Acoustic emission signal analysis
An extension of acoustic emission technology was made which permits identification of probable source mechanisms for signals emitted during the failure of metals. This was achieved through the construction of a unique instrument and the development of special computer programs. The instrument …
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Investigation of acoustic emission in tissue deformation
… apart such as a fabric being torn. As such an acoustic noise maybe emitted and potentially quantifiable in real-time. The aim is to conduct exploratory experiments determining whether acoustic emission during tissue deformation is detectable for future influence of socket design. Animal tissue …
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The effect of geometry on acoustic emission.
Acoustic emissions are impulsive elastic waves which are part of the total energy release from many metallurgical phenomena. The emissions signature carry information about the source mechanisms and the present interest of investigators is to identify the acoustic emission sources in terms of …
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Acoustic emission based control of wood drying
… control of drying red oak lumber that monitors acoustic emission as the basis for setting environmental conditions throughout the drying process. Northern red oak (Quercus sp.) was chosen for this study because it is one of the more difficult woods grown in the United States to dry without …
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Acoustic Emission Signal Classification for Gearbox Failure Detection
… to determine the optimal number of clusters in acoustic emission (AE) data obtained from a ground test stand of a rotating H-60 helicopter tail gearbox by using mathematical algorithms and visual inspection. Signs of fatigue crack growth were observed from the AE signals acquired from the result …
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Developing acoustic emission technology for knee joint assessment
… It is the intention of this study to examine Acoustic Emission (AE) technology for such a role. AE is a method of non-destructive testing used within industry and is employed to determine structural failure through the collection of inaudible sound. The use of AE in a clinical environment …
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Assessment of rock fracture initiation using acoustic emission
DSpace SAF Submission Ingestion Package generated from Vireo submission #14339 on 2019-11-26 at 14:04:18
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Defect and fracture detection using acoustic emission monitoring
… investigates the flaw detection capabilities of Acoustic Emission (AE) technology applied to metal alloys and composite materials. The thesis explores the background to AE and how it is applied to flaw detection and fracture characterisation. In preliminary tests, a steel pressure vessel and a …
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Ultrasound stimulated acoustic emission for monitoring thermal surgery
… which uses a method coined Ultrasound Stimulated Acoustic Emission, USAE. This relatively new material property measurement method presented by M. Fatemi and J.F. Greenleaf in Science May 1998 relies on the low frequency stimulation of a material by overlapping two slightly differing high …
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Quantitative Analysis of Acoustic Emission From Rock Fracture Experiments
… aims to advance the methods of quantitative acoustic emission (AE) analysis by calibrating sensors, characterizing sources, and applying the results to solve engi- neering problems. In the first part of this thesis, we built a calibration apparatus and successfully calibrated two commercial …
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Acoustic Emission for Periodic Inspection of Composite Pressure Vessels
… of high-pressure composite gas cylinders with acoustic emission (AE) nondestructive testing. Advantages of AE recertification over the current hydrostatic method include: (1) no water contamination, since pressurization of the cylinders is done with air as opposed to water; (2) the risk of …
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The generation mechanisms of acoustic emission in metal cutting
… of the ultrasonic vibrations, commonly called acoustic emissions (AE), detected during the course of metal cutting, since, although quite a lot of research effort has been put into the use of AE to monitor metal cutting condition, the mechanism by which AE is generated is still not fully …
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ASSESSING CORROSION DAMAGE IN PRESTRESSED CONCRETE WITH ACOUSTIC EMISSION
<p> Acoustic Emission (AE) sensing is employed to assess the presence and rate of steel corrosion evolving inside prestressing steel reinforced small-scale concrete specimens. Test setup consists of grade 6,000 psi concrete blocks with dimensions 4.5 x 4.5 x 20 inch (114 x 114 x 508 mm); a 30 inch …
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Optimization of indentification of particle impacts using acoustic emission.
… particle impacts with the structure. To apply Acoustic Emission (AE) in particle-impact monitoring, previous researchers focused primarily on dry particle impacts on dry target plate and/or wet particle impacts on wet or dry target plate. For dry particle impacts on dry target plate, AE events …
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Modeling of acoustic-emission wave propagation in layered media
This study proposes a model for acoustic-emission (AE) wave propagation in a layered medium, which can be used for damage detection in structural health monitoring in general, and crack identification in non-destructive testing and evaluation for materials in particular. In the model, the materials …
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Modeling and calibration of an acoustic emission measurement system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1990.
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Acoustic emission instrumentation system for monitoring large superconducting magnets
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1984.
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Optical fiber detection of ultrasonic vibration and acoustic emission
… the study is to develop a sensor for detecting acoustic emissions (AE) inside composite structures. The basics of wave propagation inside of materials has been presented along with an overview of typical acoustic emission testing. Surface acoustic waves (SAWs) were studied first and a novel, …
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Rayleigh Wave Acoustic Emission during Crack Propagation in Steel
… have much higher amplitudes than bulk modes of acoustic emission (AE) was illustrated by an idealized thought experiment relating an SSP on a half-space to the response of crack faces to crack extension. A number of aspects of AE monitoring in finite objects were investigated. Attributes of …
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