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Dissertations / Theses on the topic 'Acoustic emisson'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 July 2025

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1

Russell-Floyd, Richard S. "Acoustic emission and acousto-ultrasonics on aromatic polymer composites." Thesis, University of Bath, 1991. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293342.

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2

Kawamoto, Sumire. "Use of Acoustic Emission/Acousto-ultrasonic Techniques for Monitoring Wood Drying Defects." Kyoto University, 2002. http://hdl.handle.net/2433/149511.

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3

Rich, Kyle T. "Characterization of Cavitation Effects in Therapeutic Ultrasound: Sonophoresis Experiments and Quantitative Emission Measurements." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491560553709751.

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4

Promboon, Yajai. "Acoustic emission source location /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.

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5

Torres, Arredondo Miguel Angel [Verfasser]. "Acoustic emission testing and acousto-ultrasonics for structural health monitoring / Miguel Angel Torres Arredondo." Siegen : Universitätsbibliothek der Universität Siegen, 2013. http://d-nb.info/1043371125/34.

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6

Mackersie, J. W. "Acoustic and electromagnetic Barkhausen emission." Thesis, Robert Gordon University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327815.

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7

Avila, Gomez Adrian Enrique. "Development MEMS Acoustic Emission Sensors." Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7392.

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The purpose of this research is to develop MEMS based acoustic emission sensors for structural health monitoring. Acoustic emission (AE) is a well-established nondestructive testing technique that is typically used to monitor for fatigue cracks in structures, leaks in pressurized systems, damages in composite materials or impacts. This technology can offer a precise evaluation of structural conditions and allow identification of imminent failures or minor failures that can be addressed by planned maintenances routines. AE causes a burst of ultrasonic energy that is measured as high frequency s

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8

Morenghi, Luiz Carlos Rodrigues. "Proposta de um sistema integrado de monitoramento para manutenção." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18140/tde-18022016-145504/.

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Historicamente, as atividades de manutenção têm sido caracterizadas como um problema dentro das organizações. Entretanto, nos últimos anos, esta atitude tem sido revista e tem levado a um reconhecimento da manutenção como uma função estratégica nas empresas. Esta mudança do papel da manutenção é fruto da globalização de mercados, que forçam as organizações a competir não somente em qualidade, diferenciação ou preço, mas também, em inovações tecnológicas, redução de tempo de atendimento e tecnologia de informação. A informação é um recurso essencial para direcionar e atingir os objetivos da ges

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9

Ferreira, Fábio Isaac. "Predição da Largura Útil de Dressadores de Ponta Única Utilizando Emissão Acústica e Redes Neurais Artificiais /." Bauru, 2016. http://hdl.handle.net/11449/144381.

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Orientador: Paulo Roberto de Aguiar<br>Banca: Fabricio Guimarães Baptista<br>Banca: Danilo Hernane Spatti<br>Resumo: A dressagem é um processo essencial para a usinagem, pois impacta diretamente na qualidade superficial de peças retificadas. A dressagem consiste em recompor a característica cortante dos grãos abrasivos da superfície do rebolo após sucessivas retificações, a partir da remoção de material pela ponta do dressador de diamante. O dressador pode ser monitorado em tempo real utilizando sensores, a fim de garantir a qualidade no processo da dressagem e fornecer informações da condição

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10

Lison, Almkvist Axel. "Acoustic emission methods in fatigue testing." Thesis, KTH, Maskinkonstruktion (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-183527.

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Acoustic emissions are small vibration pulses, elastic waves, emitted from damage processes such as crack growth inside a material. Acoustic emission (AE) is also the name of the test method in which theses emissions are recorded and analysed and the method is used in materials research and the testing and inspection of structures. At Scania, a large manufacturer of trucks and buses, previous attempts to implement this technique has been unsuccessful due to the fact that the hydraulic rigs in which the material typically is tested, produce a high background noise level, that covers the interes

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11

Jackson, A. L. "Acoustic emission and yield in sand." Thesis, Aston University, 1986. http://publications.aston.ac.uk/14240/.

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An experimental investigation into the Acoustic Emission (AE) response of sand has been undertaken, and the use of AE as a method of yield point identification has been assessed. Dense, saturated samples of sand were tested in conventional triaxial apparatus. The measurements of stresses and strains were carried out according to current research practice. The AE monitoring system was integrated with the soil mechanics equipment in such a way that sample disturbance was minimised. During monotonically loaded, constant cell pressure tests the total number of events recorded was found to increase

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12

Pomponi, Eraldo. "Advanced signal processing in acoustic emission." Doctoral thesis, Università Politecnica delle Marche, 2009. http://hdl.handle.net/11566/242269.

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13

Knight, Richard David. "Mechanisms of otoacoustic emission." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272391.

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14

Pearson, Stephen Herbert. "Nonlinear Ball Chain Waveguides For Acoustic Emission And Ultrasound Sensing Of Ablation." ScholarWorks @ UVM, 2014. http://scholarworks.uvm.edu/graddis/256.

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Harsh environment acoustic emission and ultrasonic wave sensing applications often benefit from placing the sensor in a remote and more benign physical location by using waveguides to transmit elastic waves between the structural location under test and the transducer. Waveguides are normally designed to have high fidelity over broad frequency ranges to minimize distortion - often difficult to achieve in practice. This thesis reports on an examination of using nonlinear ball chain waveguides for the transmission of acoustic emission and ultrasonic waves for the monitoring of thermal protection

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15

Gomes, João Jorge de Faria. "Identificação em processo de mecanismos de desgaste de rebolos." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-20032017-113947/.

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O objetivo deste trabalho é o desenvolvimento de um sistema de monitoramento capaz de identificar em processo o mecanismo de desgaste ao qual o rebolo está sendo submetido durante a retificação. Assim, inicialmente foram pesquisados os meios físicos, os tipos de sensores e estratégias utilizadas nos sistemas de monitoramento, o estágio atual de desenvolvimento e suas aplicações. Para que este sistema seja confiável e eficiente foi necessário estudar detalhadamente a fenomenologia dos mecanismos de desgaste do rebolo. Este estudo permite definir parâmetros para identificação do tipo de desgaste

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16

Mathiyaparanam, Jeyisanker. "Analysis of acoustic emission in cohesionless soil." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001715.

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17

Eftekharnejad, Babak. "Condition monitoring of gearboxes using acoustic emission." Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/6780.

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Acoustic emission (AE) is one of many technologies for health monitoring and diagnosis of rotating machines such as gearboxes. Although significant research has been undertaken in understanding the potential of AE in monitoring gearboxes this has been solely applied to spur gears and slow speed roller bearings. This research presents an experimental investigation that assesses the effectiveness of both AE and vibration technologies in identifying various types of defects on in a helical gearbox; the first known attempt. Furthermore, the application of advanced signals processing techniques suc

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18

Theobald, Peter. "Standards for the measurement of acoustic emission." Thesis, Brunel University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401552.

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19

Elfergani, Hisham. "Acoustic emission analysis of prestressed concrete structures." Thesis, Cardiff University, 2013. http://orca.cf.ac.uk/49383/.

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This thesis examines the role of Acoustic Emission (AE) as a non-destructive testing (NDT) technique for prestressed and reinforced concrete structures. The work focuses on the development of experimental techniques and data analysis methods for the detection, location and assessment of AE from prestressed and reinforced concrete specimens. This thesis reveals that AE can be used to detect the onset of corrosion activity in wire in the interface between prestressed concrete and mortar as found in prestressed concrete pipes. Furthermore, this technique can be used to locate the corrosion activi

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20

Liu, Hao, and 劉浩. "Acoustic emission and crack development in rocks." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31242066.

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21

Carolan, Thomas Andrew. "Acoustic emission detection by fibre optic interferometry." Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1419.

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22

Waring, Michael John. "Acoustic emission of pharmaceutical materials during compaction." Thesis, Liverpool John Moores University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291285.

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23

Honeycutt, Robert Mahone. "Acoustic emission based control of wood drying." Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/39781.

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Drying is one of the most critical process steps in converting trees to a marketable material for use in high value wood products. The primary reasons for drying wood are to prevent biological deterioration and to improve mechanical strength and dimensional stability. The purpose of this research study was to develop an approach to the 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

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24

Liu, Hao. "Acoustic emission and crack development in rocks." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22786338.

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25

Naumann, Jack. "Acoustic emission monitoring of wind turbine bearings." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/12397/.

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Climate change, national and international targets and a possible impending fuel scarcity is driving the need for a clean, cheap and sustainable energy source. Although onshore wind is currently the most economically viable source of renewable energy, high failure rates often occurring many years prior to their design life, are increasing the cost through additional maintenance and downtime. The gearbox, and in particular the bearings within the gearbox are the components responsible for the largest proportion of downtime. Field studies have shown damage to the inner race of the planetary supp

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26

Locey, Lance Lester. "Analysis and Comparison of Three Acoustic Energy Density Probes." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd561.pdf.

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27

Shum, Pak W. "A critical analysis of the acoustic emmission technique for NDE of pressure vessels." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09192009-040341/.

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28

Celestino, Valter Roberto de Brito [UNESP]. "Análise comparativa do uso de ferramentas de metal duro sem revestimento e revestidas com diboreto de titânio na usinagem da madeira." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/132488.

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Made available in DSpace on 2016-01-13T13:26:49Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-06-22. Added 1 bitstream(s) on 2016-01-13T13:32:07Z : No. of bitstreams: 1 000847056.pdf: 8844792 bytes, checksum: c194eab89a9feaffc22c568bf24f7741 (MD5)<br>A utilização de processos de usinagem para dar forma e acabamento é madeira tem sido ampliada muito nos últimos anos, levada pela necessidade de peças que contenham um melhor acabamento superficial atrelado à boa produtividade que é conseguida pelo aperfeiçoamento contínuo de equipamentos e de ferramentas para processar a madeira. Este

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29

Celestino, Valter Roberto de Brito. "Análise comparativa do uso de ferramentas de metal duro sem revestimento e revestidas com diboreto de titânio na usinagem da madeira /." Bauru, 2015. http://hdl.handle.net/11449/132488.

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Orientador: Manoel Cleber de Sampaio Alves<br>Banca: Marcos Tadeu Tiburcio Gonçalves<br>Banca: Ivaldo de Domenico Valarelli<br>Resumo: A utilização de processos de usinagem para dar forma e acabamento é madeira tem sido ampliada muito nos últimos anos, levada pela necessidade de peças que contenham um melhor acabamento superficial atrelado à boa produtividade que é conseguida pelo aperfeiçoamento contínuo de equipamentos e de ferramentas para processar a madeira. Este trabalho utilizou um sistema experimental de torneamento com um novo cabeçote porta-ferramenta, contendo sensores de potência,

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30

Karlsson, Linus. "Crack Detection in Welding Process using Acoustic Emission." Thesis, Mälardalen University, School of Innovation, Design and Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-9503.

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<p>Abstract: The process of inspecting welds done in production at Volvo Aero in Trollhättan is timeconsuming and a lot of this time goes into examining faulty objects. The aim of this thesis is to startdevelopment of a system that analyses acoustic emission from cooling welds to determine the qualityof the weld. Our aim is to be able to detect cracks in the material and to give information on thecracks using the data gathered by our sensors. To do this we will use methods to locate sound sourcesand then rate our findings and do some simplifications on the result of our calculations. We willan

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31

Al-Jumaili, Safaa Khairry. "Damage assessment in complex structures using acoustic emission." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/92381/.

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This thesis investigates the behaviour and failure of simple and complex structures using the structural health monitoring system (SHM). The work focuses on Acoustic Emission (AE) to detect, characterise and locate damage within metallic and composites structures under a fatigue loading regime. The work was divided into two main areas of research: 1. Damage Characterisation Damage detection utilising AE was conducted through an extensive experimental programme in large-scale carbon fibre composite structures. Different assessment techniques were used to assess different damage mechanisms withi

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32

Crowther, Timothy Guy. "Application of chemical acoustic emission to industrial processes." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29804.

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This thesis reports on two chemical acoustic emission studies of importance to Canadian Industry. The first demonstrated that the rate of evolution of hydrogen and oxygen from electrodes in an electrolysis cell may be conveniently monitored via its ultrasonic acoustic emission, in a non-intrusive manner. The apparatus used in this work consisted of a nickel anode, a stainless steel cathode, and a saturated calomel reference electrode, all situated in a three-chamber cell containing sodium hydroxide electrolyte solutions of various concentrations. The potential necessary for evolution of both h

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33

Flannigan, James Christopher. "Acoustic emission monitoring of fiber reinforced bridge panels." Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/890.

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34

Armstrong, J. A. "Characterisation of bone cement damage by acoustic emission." Thesis, Queen's University Belfast, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517071.

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35

Pettitt, William S. "Acoustic emission source studies of microcracking in rock." Thesis, Keele University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267454.

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Acoustic emissions (AEs) are generated as a result of the creation of, or movement on microcracks in a rock mass. Hypocentres of AEs have been used as a very effective method of visualising the extent (amount and location) of microcrack damage. Studies have used AE locations to investigate both the behaviour of rock failure in laboratory experiments, and to evaluate damage in the Excavation Disturbed Zone (EDZ) around underground openings. The latter has particular significance for the safe storage of nuclear materials in deep underground facilities. Because AEs represent phenomena associated

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36

Venturini, Autieri Marco Rosario. "Acoustic emission characterisation of damage in CFRP composites." Thesis, University of Southampton, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438704.

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37

Thierman, Jonathan S. (Jonathan Sidney) 1976. "Ultrasound stimulated acoustic emission for monitoring thermal surgery." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8880.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.<br>Includes bibliographical references (leaves 88-93).<br>Therapeutic ultrasound describes a non-invasive surgical technique by which high-energy ultrasound is delivered to malignant tissue. This method must be monitored in order to ensure that the correct tissues are treated and that the tissues are treated with the proper dose. Typically, therapeutic ultrasound has relied on MRI techniques to monitor the extent of the thermal surgery. Besides for the great cost and limited availability, MRI monitorin

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38

Thakkar, Nirav Ashokkumar. "Monitoring of rail/wheel interaction using acoustic emission." Thesis, Heriot-Watt University, 2009. http://hdl.handle.net/10399/2291.

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The work presented in this thesis is related to the condition monitoring of rail-wheel interaction using Acoustic Emission (AE), the principle being that both normal and abnormal rolling give rise to AE, features of which are related to the mechanical intensity of the interaction and hence the stress range (or stress intensity factor range) to which sections of track is being exposed. Most of the work was carried out on a model wheel running on a model circular track, which was first characterised using a simulated source before studying the wave propagation from a continuously moving (wheel)

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39

Buttle, D. J. "Barkhausen and magneto-acoustic emission from ferromagnetic materials." Thesis, University of Oxford, 1986. http://ora.ox.ac.uk/objects/uuid:73130e7a-43ab-47fb-a531-65b605bf1904.

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Barkhausen emission (B.E.) and Magneto-acoustic emission (M.A.E.) can be detected from specimens in a magnetic field varying at a few millihertz. Comparison of the two signals can indicate the nature of the domain walls responsible for the activity at any particular field. In order to characterize a specimen the strength of the emissions around the hysteresis loop are measured together with the distribution of Barkhausen event sizes. This technique has been used to measure the effects of: (A) Microstructure. Both B.E. and M.A.E. are sensitive to dislocations, and the effects of cold-working an

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40

Shehadeh, Mohamed F. "Monitoring of long steel pipes using acoustic emission." Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/2155.

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This thesis relates to the condition monitoring of long steel pipes using acoustic emission (AE). A number of experiments were carried out on pipes with a range of internal and external environments using a linear axial array of sensors with the ultimate aim of locating and reconstituting the time-domain and frequency-domain signatures of AE sources. The AE waves were generated from simulated, discontinuous, continuous, and semi-continuous sources and from real sources generated by impacts and crack propagation. The simulated source work in different internal and external environments was carr

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41

Droubi, Mohamad Ghazi. "Monitoring particle impact energy using acoustic emission technique." Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/2661.

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The estimation of energy dissipated during multiple particle impact is a key aspect in evaluating the abrasive potential of particle-laden streams. A systematic investigation of particle impact energy using acoustic emission (AE) measurements is presented in this thesis with experiments carried out over a range of particle sizes, particle densities and configurations. A model of the AE impact time series is developed and validated on sparse streams where there are few particle overlaps and good control over particle kinetic energies. The approach is shown to be robust and extensible to cases w

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42

Miller, D. G. "Acoustic emission analysis of an automotive paint system." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/47293.

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43

Sun, Jun. "Condition monitoring by acoustic emission and electrostatic technologies." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/64797/.

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The increasing demands made on operational availability and reliability of machinery requires the adoption of innovative methods to assess the machine’s current condition and predict its condition in future. Rapid advances in the design and working condition of mechanical systems in industrial, aerospace and military equipment over the years have resulted in the ever-increasing complexity of problems encountered in the management of their maintenance. The ability to monitor the performance of machinery components in terms of wear and durability is extremely invaluable. Thus, it is essential to

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44

Mahmoud, Houssam. "Diagnosis of Pneumatic Cylinders Using Acoustic Emission Methods." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399214.

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Tato práce se zabývá vývojem nového efektivního diagnostického postupu pro kontrolu funkce pneumatických válců pomocí metody akustické emise. Cílem práce bylo navrhnout a určit diagnostická kritéria pro hodnocení kvality vybraných typů pneumatických válců. Prvním krokem bylo nalezení typického akustického emisního signálu, který je spojen s určitým typem poškození ve válci využitím frekvenčního spektra signálu. Později byl tento parametr nahrazen parametrem RMS během sledování změn v průběhu testů. Na konkrétních válcích byl sledován vztah mezi akustickou emisí a různými typy defektů a byl pře

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45

Mckuur, Gerswynn. "Defect and fracture detection using acoustic emission monitoring." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/5505.

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Includes bibliographical references (leaves 64-66).<br>This thesis is a consolidation of work that 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 filament wound composite pressure vessel were used in hydro proofing tests. Each of the vessels had existing flaws/defects in them. The locations of these flaws were known. Acoustic emission sensors were pl

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46

Ferrando, Chacon Juan Luis. "Fault detection in rotating machinery using acoustic emission." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/11510.

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Rotating machinery is a critical asset of industrial plants worldwide. Bearings and gearboxes are two of the most common components found in rotating machinery of industrial plants. The malfunction of bearings and gearboxes lead the machine to fail and often these failures occur catastrophically leading to personnel injuries. Therefore it is of high importance to identify the deterioration at an early stage. Among the techniques applied to detect damage in rotating machinery, acoustic emission has been a prevalent field of research for its potential to detect defects at an earlier stage than o

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47

Chai, J. W. "Acquisition, processing and interpretation of acoustic emission signals." Thesis, University of Manchester, 1995. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488284.

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48

Liu, Ting-Hung. "Testing and Packaging for MEMS Acoustic Emission Sensors." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7692.

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The goal of this research is to improve the structure and dimension of the MEMS acoustic emission sensor. Acoustic emission sensor (AE sensor) based on the piezoelectric transducer is a well-developed technology in non-destructive testing that is widely used to determine permanent damage such as cracks and corrosions in buildings and structures. The AE sensor can be used to monitor cracks in structures and to check leakage in pressurized systems. The location of cracks in a structure or system leakage causes a high-frequency surface vibration while

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49

Zohora, Fatematuz. "Evaluation of material crack using acoustic emission technique." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/94663/1/Fatematuz_Zohora_Thesis.pdf.

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Cracks in civil structures can result in premature failure due to material degradation and can result in both financial loss and environmental consequences. This thesis reports an effective technique using Acoustic Emission (AE) technique to assess the severity of the crack propagation in steel structures. The outcome of this work confirms that combination of AE parametric analysis and signal processing techniques can be used to evaluate crack propagation under different loading configurations. The technique has potential application to assess and monitor the condition of civil structures.

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50

Nau, Gregory Merrill. "Optical fiber detection of ultrasonic vibration and acoustic emission." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09292009-020053/.

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