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Dissertations / Theses on the topic 'Advanced non destructive testing methods'

Author: Grafiati

Published: 5 June 2025

Last updated: 16 July 2025

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1

Kilic, Gokhan. "Application of advanced non-destructive testing methods on bridge health assessment and analysis." Thesis, University of Greenwich, 2012. http://gala.gre.ac.uk/9811/.

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Bridge structures have an important role in economic, social and environmental aspects of society life. Bridges are also subject to a natural process of deterioration of construction materials, as well as natural and environmental events such as flooding, freezing, thawing etc. Health monitoring and assessment of the structural integrity of bridges have been the focus of engineers and researchers for decades. Currently, the various aspects of bridge health are monitored separately. However, measuring these aspects independently does not give the overall health of the bridge and crucial indicat

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2

Lowea, D. "Methods of non-destructive testing." Thesis, Київський національний університет технологій та дизайну, 2019. https://er.knutd.edu.ua/handle/123456789/14600.

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3

Billson, Duncan Robert. "Advanced non-contacting ultrasonic techniques for non-destructive testing." Thesis, University of Warwick, 1994. http://wrap.warwick.ac.uk/107577/.

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This thesis describes research towards the development of ultrasonic methods to test samples that are difficult to test using conventional techniques, with particular emphasis being given to non-contacting methods. The samples investigated in detail were adhesively bonded structures and zircalloy (a zirconium-niobium alloy). The adhesively bonded structures were investigated ultrasonically using an ultrasonic resonance technique (referred to as ultrasonic spectroscopy) to analyse suitable ultrasonic waveforms. This thesis starts by explaining a new approach to ultrasonic spectroscopy, and then

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4

Draper, Jeffrey Dean. "Neural networks and non-destructive test/evaluation methods." Thesis, College Park, Maryland : University of Maryland, College Park, 1992. http://handle.dtic.mil/100.2/ADA254802.

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Thesis (M.S. in Civil Engineering)--University of Maryland, College Park, 1992.<br>"A scholarly paper submitted to Assistant Professor Ian Flood." Description based on title screen as viewed on April 16, 2009. Includes bibliographical references (p. 49-52). Also available in print.

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Blaney, Sean. "Unmanned aerial vehicle-based non-destructive testing methods for concrete structures." Thesis, Elsevier; Cement and Concrete Composites, 2018. https://dspace.library.uvic.ca//handle/1828/9757.

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In this work, unmanned aerial vehicle-based non-destructive testing methods for concrete structures are evaluated and developed. There exists a need for improved infrastructure inspection techniques with increased expediency. Unmanned aerial vehicles (UAVs) are highly mobile and have shown promise towards achieving this directive, but more work is required to adapt traditional NDT methods to be UAV-compatible. To this end, concrete sounding techniques were evaluated with a quantitative acoustic frequency analysis procedure on a series of concrete slabs. One such method was adapted for use with

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6

Fletcher, Adam. "Non-destructive testing of the graphite core within an advanced gas-cooled reactor." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/nondestructive-testing-of-the-graphite-core-within-an-advanced-gascooled-reactor(3ca5c904-6860-46b8-8538-4136cb2aedcd).html.

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The aim of this work has been to apply the techniques of non-destructive testing and evaluation to the graphite fuel channel bricks which form the core of an Advanced Gas-Cooled reactor. Two modes of graphite degradation have been studied: subsurface cracks originating from the keyway corners of the bricks and the reduction in material density caused by radiolytic oxidation. This work has focused on electromagnetic inspection techniques. Brick cracking has been studied using a multi-frequency eddy current technique with the aim of determining quantitative information. In order to accurately co

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7

Wong, Fuk-Lun Alexander. "Investigations into non-destructive methods of structural testing using finite element models." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/11956.

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8

Musonda, Vincent. "Comparative study of non-destructive testing methods of defect detection on aircraft." Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/5498.

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Includes bibliographical references (leaves 122-135).<br>There is currently an increase in the usage of composite materials both in civilian and military aircraft because of their mechanical resistance, high toughness, reduced weight and immunity to corrosion. Any damage in the fibers of these composites requires an evaluation in order to ensure the integrity of aircraft structures. Composite materials are subject to various degrees of damage during their service life and therefore maintenance of these light-weight structures is a new challenge for non-destructive testing (NDT) which requires

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9

Chipanga, Tendai. "Determination of the accuracy of non-destructive residual stress measurements methods." Thesis, [S.l. : s.n.], 2009. http://dk.cput.ac.za/cgi/viewcontent.cgi?article=1100&context=td_cput.

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10

Rossa, Riccardo. "Advanced non-destructive methods for criticality safety and safeguards of used nuclear fuel." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/238202.

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The safeguards verification of spent nuclear fuel is one of the major concern for the safeguards community, as this material represents about 80% of all material placed under safeguards.This PhD thesis described the development of two passive non-destructive assay (NDA) techniques: the Self-Indication Neutron Resonance Densitometry (SINRD) and the Partial Defect Tester (PDET).The NDA methods were investigated with Monte Carlo simulations and the benchmark experiments for SINRD were performed at the GELINA facility of JRC-IRMM in Geel, Belgium.The results for the SINRD technique showed promisin

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Lu, Mingyang. "Forward and inverse analysis for non-destructive testing based on electromagnetic computation methods." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/forward-and-inverse-analysis-for-nondestructive-testing-based-on-electromagnetic-computation-methods(c9b4f030-eb7d-42a9-b55c-07df6b96aa1f).html.

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EM computation methods for the simulation and reconstruction of the metallic plate properties are investigated in this thesis. Two major computational problems exist in EM NDT: the forward problem and the inverse problem. The forward problem is to calculate the frequency-dependent inductance for steel plates with arbitrary values of permeability, conductivity, thickness and lift-off (i.e. the distance between the sensor and test sample). The inverse problem involves how to determine each parameter, i.e. permeability, conductivity, thickness and lift-off from the frequency-dependent inductance

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12

Weston, Miles. "Advanced ultrasonic digital imaging and signal processing for applications in the field of non-destructive testing." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/advanced-ultrasonic-digital-imaging-and-signal-processing-for-applications-in-the-field-of-nondestructive-testing(12406082-d270-43a0-8520-aed175695115).html.

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Non-destructive testing (NDT) is the process of non-invasive material examination. Within this field, ultrasonic inspection is one method of examination used to detect flaws in structural and functional industrial components, to assess their structural integrity and fitness for service. Conventional NDT ultrasonic array techniques transmit on multiple elements in parallel, according to a focal law, which facilitates beam steering, focussing and scanning within the test component. Received signals are then 'stacked' to generate images of the test component. With the advent of affordable high sp

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Chan, Hon-Fung Cyril. "Non-destructive testing of concrete piles using the sonic echo and transient shock methods." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/13349.

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14

Britt, Olivia Grace. "Assessing the Suitability of Typical Timber Testing Methods for Australian Heritage Timber Structures." Thesis, Sydney School of Architecture, Design and Planning, 2023. https://hdl.handle.net/2123/30017.

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This research aims to examine the applicability of conventional inspection methods for timber structures where structures have recognised heritage value. The research seeks to understand the appropriateness of inspection methodologies typically prescribed for timber in heritage applications. A literature review of current inspection methods utilised by engineers, architects and others within the heritage structures field has been undertaken, and the appropriateness of timber structural inspection methods used in practice (destructive testing, semi-destructive testing, and non-destructive testi

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Schecklman, Scott G. "Physics-Based Signal Processing Methods for Terahertz Non-Destructive Evaluation of Layered Media." PDXScholar, 2019. https://pdxscholar.library.pdx.edu/open_access_etds/5013.

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In recent years Terahertz (THz) time domain spectroscopy has emerged as a promising new technology with potential applications in a variety of fields, including industrial manufacturing, security screening and medical imaging. Pulsed THz systems are uniquely suited for non-destructive evaluation (NDE) of the sub-surface layers of dielectric packaging and coating materials, because they provide high dynamic range over a wide bandwidth in the far infrared portion of the electromagnetic spectrum. Often the dielectric materials of the packaging and/or surface coating layers exhibit relatively low

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Gupta, Bhaawan. "Advanced electromagnetic non-destructive testing on creep degraded high chromium ferritic steels : Characterization, Modelling and physical interpretation." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI074.

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Sous des températures et des pressions élevées constantes, les matériaux métalliques de structure subissent une dégradation mécanique par fluage qui entraîne des changements microstructuraux. Ces derniers, s'ils ne sont pas surveillés à temps, peuvent entraîner des incidents sérieux, notamment dans le domaine de la production d’énergie électrique (centrales électriques). Pour déterminer les changements microstructuraux, le matériau doit avoir une forme et une taille spécifiques pour que l'analyse des images obtenues par microscopie électronique à balayage, diffraction par rétrodiffusion d'élec

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Giannopoulos, Antonios. "The investigation of transmission-line matrix and finite-difference time-domain methods for the forward problem of ground probing radar." Thesis, Online version, 1998. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.245873.

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18

Tan, Hock Chuan. "Load-induced damage evaluation in reinforced concrete structures using dynamic response signatures." Thesis, University of Aberdeen, 2000. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602019.

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The purpose of this thesis is to assess and develop a non-destructive evaluation (NDE) procedure for evaluating the integrity of rectangular and square reinforced concrete (RC) slabs. This procedure employs both dynamic frequency and deformation response signatures to track changes in the slab following dynamic excitation. Such a procedure could provide a good basis for practising engineers to conduct nondestructive testing (NDT) and evaluation of general RC structures. The response of RC floor slabs to dynamic excitation have been experimentally studied at 1/3rd scale for two aspect ratios (s

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Piñal, Moctezuma Juan Fernando. "Characterization of damage evolution on metallic components using ultrasonic non-destructive methods." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/667641.

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When fatigue is considered, it is expected that structures and machinery eventually fail. Still, when this damage is unexpected, besides of the negative economic impact that it produces, life of people could be potentially at risk. Thus, nowadays it is imperative that the infrastructure managers, ought to program regular inspection and maintenance for their assets; in addition, designers and materials manufacturers, can access to appropriate diagnostic tools in order to build superior and more reliable materials. In this regard, and for a number of applications, non-destructive evaluation tech

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Rudraraju, Sridhar. "Fiber optic methods for nondestructive testing." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-01102009-063839/.

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21

Malik, Qurrat-ul-Ain. "Novel methods of object recognition and fault detection applied to non-destructive testing of rail's surface during production." Thesis, Manchester Metropolitan University, 2013. http://e-space.mmu.ac.uk/314012/.

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A series of rail image inspection algorithms have been developed for Tata Steels Scunthorpe rail production line. The following thesis describes the contributions made by the author in the design and application of these algorithms. A fully automated rail inspection system that has never been implemented before in any such company or setup has been developed. An industrial computer vision system (JLI) already exists for the image acquisition of rails during production at a rail manufacturing plant in Scunthorpe. An automated inspection system using the same JLI vision system has been developed

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22

Wessels, Coenraad Brand. "The variation and prediction of structural timber properties of standing Pinus patula trees using non-destructive methods." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86246.

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Thesis (PhD(For))--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Pinus patula is the most intensively planted conifer in the tropics and sub‐tropics. In South Africa Pinus patula plantations are the main saw‐log resource for structural lumber production. Improved intensive silvicultural practices and tree breeding have resulted in marked increases in the rate of growth. To reap the financial benefits of the faster growth, plantation managers are more and more inclined to reduce rotation ages, which inevitably results in the production of higher proportions of juvenile wood at final

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23

Brashear, Kyle Thomas. "The Assessment of Sonic Waves and Tracer Gases as Non-Destructive Testing (NDT) Methods for In-Situ Underground Mine Seals." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/50519.

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Since the MINER Act of 2006, the minimum static load of in-situ underground mine seals has been increased from 20-psi to either 50-psi if monitoring is conducted or 120-psi if left unmonitored. These minimum strength requirements in seals must be designed, built, and maintained throughout the lifetime of the seal. Due to this, it has become necessary to assess the effectiveness of non-destructive testing (NDT) technologies to determine seal integrity, which in this case, are explored using sonic waves and tracer gases. Through both small and large scale testing, two NDT methods were evaluated

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Yucel, Mehmet Kerim. "Signal processing methods for defect detection in multi-wire helical waveguides using ultrasonic guided waves." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/11219.

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Non-Destructive Testing of industrial components carries vital importance, both financially and safety-wise. Among all Non-Destructive techniques, Long Range Ultrasonic Testing utilizing the guided wave phenomena is a young technology proven to be commercially valid. Owing to its well-documented analytical models, Ultrasonic Guided Waves has been successfully applied to cylindrical and plate-like structures. Its applications to complex structures such as multi-wire cables are fairly immature, mainly due to the high complexity of wave propagation. Research performed by the author approaches the

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Safont, Armero Gonzalo. "New Insights in Prediction and Dynamic Modeling from Non-Gaussian Mixture Processing Methods." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/53913.

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[EN] This thesis considers new applications of non-Gaussian mixtures in the framework of statistical signal processing and pattern recognition. The non-Gaussian mixtures were implemented by mixtures of independent component analyzers (ICA). The fundamental hypothesis of ICA is that the observed signals can be expressed as a linear transformation of a set of hidden variables, usually referred to as sources, which are statistically independent. This independence allows factoring the original M-dimensional probability density function (PDF) of the data as a product of one-dimensional probability

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Gränne, Fredrik. "Air and Water Tightness in Building Envelopes - Evaluation of Methods for Quality Assurance." Doctoral thesis, KTH, Building Sciences and Engineering, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3264.

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<p>The purpose of this work is to contribute to a process formaking buildings with good function and to avoid prematurefaults.</p><p>The design, construction and installation of low-slopedroofs are important parts of creating a durable building. Mostof the leakages in low-sloped roofs occur where materials withdifferent thermomechanical properties are joined together. Withbetter knowledge about these joints, the expected service lifecould better be estimated. Common roofing materials onlow-sloped roofs are roof membranes.</p><p>To avoid damages and to minimise energy consumption thedetection o

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Livingston-Peters, Ann E. "AN INVESTIGATION INTO THE PROPERTIES AND FABRICATION METHODS OF THERMOPLASTIC COMPOSITES." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1224.

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As applications for thermoplastic composites increase, the understanding of their properties become more important. Fabrication methods for thermoplastic composites continually improve to match designs specifications. These advanced thermoplastics have begun to show an improvement in mechanical properties over those found in thermoset composites commonly used in industry. Polyaryletherketones (PEK) have high service temperatures, good mechanical properties, and improved processing capabilities compared to thermoplastics used in the past making them important to the aerospace industry. The wide

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Ozturk, Emre. "Estimation Of The Height Of Surface Breaking Cracks Using Ultrasonic Timing Methods." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12607176/index.pdf.

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In this thesis, two ultrasonic timing methods are used in order to investigate the accuracy and reliability of measurements for surface breaking cracks having different orientations and heights. Also the best applicable measurement technique is searched by comparing the received test results. These methods are the Time of Flight Diffraction (TOFD) Method using diffraction of longitudinal waves and another method using the reflection of shear waves from the crack tips. In order to simulate and measure the height of surface breaking cracks three sets of test blocks from steel, and two sets of we

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Levine, Ross M. "Ultrasonic guided wave imaging via sparse reconstruction." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51829.

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Structural health monitoring (SHM) is concerned with the continuous, long-term assessment of structural integrity. One commonly investigated SHM technique uses guided ultrasonic waves, which travel through the structure and interact with damage. Measured signals are then analyzed in software for detection, estimation, and characterization of damage. One common configuration for such a system uses a spatially-distributed array of fixed piezoelectric transducers, which is inexpensive and can cover large areas. Typically, one or more sets of prerecorded baseline signals are measured when the stru

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Djafa, tchuspa Steve moses. "Développement et optimisation d'un modèle numérique 3D pour la simulation d'un système dédié au contrôle non destructif des tubes ferromagnétiques par flux de fuite." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00953405.

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Le principe du contrôle non destructif par Flux de Fuite Magnétique (FFM) consiste à magnétiser une pièce à contrôler par un champ magnétique intense et à détecter à l'aide d'un capteur magnétique les fuites des lignes de champ qui résultent de la présence d'un défaut dans la pièce. Les méthodes de contrôle FFM sont très employées notamment lors du processus de fabrication des tubes ferromagnétiques par la société Vallourec, le leader mondial des fabricants de tube. Dans le but d'améliorer les performances des systèmes de contrôle installés en usine, le CEA LIST et le centre de recherches de V

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Al-Soudani, Maha. "Diagnosis of reinforced concrete structures in civil engineering by GPR technology : development of alternate methods for precise geometric recognition." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30090.

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La méconnaissance de la géométrie réelle d'une structure mène à une évaluation incorrecte de son état. Par conséquent, une estimation imprécise de sa capacité portante, sa durabilité, sa stabilité et la nécessité de mettre en place une réparation ou un renforcement. En outre, l'optimisation du temps requis pour le processus de réparation a besoin de bien connaître les différentes parties de la structure à évaluer et également pour éviter les zones critiques telles que les aciers, les câbles, etc., lors de la réparation. Par conséquent, il est nécessaire d'utiliser des techniques d'évaluation n

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Popov, Mikhail. "Analytic and Numerical Methods for the Solution of Electromagnetic Inverse Source Problems." Doctoral thesis, KTH, Electromagnetic Theory, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3134.

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Poggi, Francesco. "Bending properties of commercial wood-based panels by NDT methods." Thesis, Linnéuniversitetet, Institutionen för skog och träteknik (SOT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-66162.

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This thesis work focuses mainly on the application of non-destructive testing (NDT) methods on wood-based panels (WBP) in order to estimate the bending properties. To prove the accuracy and applicability of these methods on WBP, their results are correlated with results from a standardized static bending test. The behavior in different climate conditions and the application on panels of larger sizes is also questioned to provide an indication about strong points and boundaries of NDT methods applied on WBP.The bending properties are of major importance, especially for materials suited to bear

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Ratsakou, Almpion. "Multi-physical modeling of thermographic inspection methods and fast imaging Fast models dedicated to simulation of eddy current thermography Fast simulation approach dedicated to infrared thermographic inspection of delaminated planar pieces Model based characterisation of delamination by means of thermographic inspection." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASS002.

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L’inspection thermographique est une technique populaire de contrôle non destructif qui fournit des images de distributions de température sur de grandes étendues aux surfaces des pièces testées. Détecter les délaminations entre couches métalliques est le sujet ici. La simulation de ces inspections contribue en effet à compléter les études expérimentales, à évaluer les performances en termes de détection, et à être support d'algorithmes basés sur modèles. On se focalise sur un modèle semi-analytique basé sur un développement tronqué en fonctions propres par région. Le problème est résolu dans

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Barras, Jordan. "Prédiction modale du rayonnement d’ondes élastiques guidées par une source quelconque dans une structure fine - application au contrôle non destructif." Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASG020.

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Cette thèse porte sur la modélisation de la propagation d’ondes élastiques guidées (OG) dans des structures fines - de type plaque - en vue de leur contrôle non-destructif (CND). Ces ondes sont générées par des traducteurs ultrasonores quelconques placés à la surface de la pièce - par exemple une céramique PZT ou un EMAT. On développe un modèle semi-analytique, nommé modèle du pinceau modal d’ondes guidées. Ce modèle se base sur les approximations de l’acoustique géométrique, ce qui le rend particulièrement performant du point de vue numérique et permet de simuler la propagation d’OG sur de lo

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Hebaz, Salah-Eddine. "Étude numérique de la propagation des ondes guidées ultrasonores par la méthode de Galerkin discontinue : application au contrôle non-destructif dans le domaine des transports." Thesis, Valenciennes, 2018. http://www.theses.fr/2018VALE0020/document.

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Les structures mécaniques utilisées de nos jours ne cessent d’évoluer en utilisant des matériaux composites ou à gradient fonctionnel afin de répondre aux enjeux de résistance accrue, allégement de la structure et amélioration des performances. Ceux-ci nécessitent un contrôle adéquat de leur état de santé afin de s’assurer de l’intégrité de la structure. L’utilisation des ondes guidées ultrasonores fournit un moyen efficace et rapide d’inspection sur de longues distances. Néanmoins, ces ondes présentent certaines caractéristiques complexes qui rendent la tâche très difficile. L’utilisation d’o

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Clouet, Noémie. "Caractérisation métrologique de méthodes de références primaires candidates pour l’énumération des lipoprotéines et le dosage de l’hémoglobine glyquée HbA1c." Thesis, Reims, 2017. http://www.theses.fr/2017REIMS018.

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En biologie clinique, disposer de mesures fiables et comparables, indépendamment du temps et du laboratoire, est primordial afin de permettre une prise en charge et un suivi adaptés des patients. Le moyen privilégié est d’établir la traçabilité métrologique des résultats de mesure aux unités du système international (SI), notamment par le biais de méthodes de référence et de matériaux de référence certifiés d’ordre supérieur. Ces travaux de thèse se sont attachés à caractériser deux méthodes de référence primaires candidates. Une méthode d’énumération absolue des lipoprotéines par ES-DMA pour

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Bakešová, Martina. "Stavební průzkum a diagnostika zděné konstrukce." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227513.

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The aim of my master’s thesis is to develop a brief overview of the historical development of brick, diagnosis methodologies of masonry structures and their application in the practical part for evaluation of structural survey masonry, carried out at the Faculty of Philosophy, Masaryk University in Brno.

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Kocich, Tomáš. "Komplexní diagnostika konstrukce bytového domu před rekonstrukcí." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225417.

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This thesis deals with the diagnosis of a residential building from the late nineteen twenties for the needs of reconstruction. The methods generally used in the diagnosis of structures are briefly described in the theoretical part. More deeply this section describes the methods that were used during this particular research. The practical part deals with the diagnosis of the object itself. The first section describes the layout of the villa, its design solution, its faults and defects detected during the inspection. The next section deals with evaluating the current state of construction mate

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Suyama, Fernando Moreira. "Detecção de defeitos em juntas soldadas de tubulações de petróleo em radiografias computadorizadas parede dupla vista dupla (PDVD) por redes neurais." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1351.

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CAPES<br>A detecção de defeitos de soldagem em imagens radiográficas visa garantir a segurança das estruturas em análise com o objetivo de evitar perdas financeiras e prevenir contra danos ambientais. Atualmente, a inspeção de juntas soldadas é uma atividade essencialmente humana e, portanto, está sujeita a erros relacionados à acuidade visual, à experiência, à fadiga e às distrações do inspetor, afetando a repetitividade e reprodutibilidade deste processo. Nesse sentido, este trabalho apresenta um método para auxiliar na detecção de defeitos em juntas soldadas de tubulações de petróleo, utili

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Guarneri, Giovanni Alfredo. "Identificação de descontinuidades em peças metálicas utilizando sinais ultrassônicos e técnicas de problemas inversos." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1370.

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CNPQ; LASCA<br>Este trabalho propõe um algoritmo para identiﬁcar descontinuidades internas em uma peça metálica a partir de sinais A-scan provenientes de um ensaio não-destrutivo por ultrassom. As descontinuidades são identiﬁcadas por seu formato, dimensões, orientação e localização. Esse algoritmo é baseado na resolução de problemas inversos. O problema da identiﬁcação de descontinuidades é modelado utilizando uma abordagem inédita, em que a descontinuidade é caracterizada por dois elementos distintos: a sua amplitude de espalhamento e a localização de seu centro. Com essa nova forma de repre

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Timčaková, Kristýna. "Monitorování a analýza koroze výztužné oceli v železobetonových prvcích a konstrukcích akustickými metodami." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-401591.

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The dissertation thesis deals with the study of non-destructive acoustic methods as instruments for monitoring and analysing corrosion of reinforcing steel in reinforced concrete elements. Four acoustic methods were selected for this task - the impact-echo method, the nonlinear acoustic spectroscopy method, the acoustic emission method, and the ultrasonic pulse velocity method. To verify the functionality of these methods, testing was carried out on three sets of reinforced concrete samples that had been exposed to the effects of sodium chloride, which corroded the embedded steel reinforcement

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Kroetz, Marcel Giovani. "Sistema de apoio na inspeção radiográfica computadorizada de juntas soldadas de tubulações de petróleo." Universidade Tecnológica Federal do Paraná, 2012. http://repositorio.utfpr.edu.br/jspui/handle/1/509.

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Petrobras<br>A inspeção radiográfica de juntas soldadas de tubulações é a atividade minuciosa e cuidadosa de observar imagens radiográficas de juntas soldadas em busca de pequenos defeitos e descontinuidades que possam comprometer a resistência mecânica dessas juntas. Como toda atividade que requer atenção constante, a inspeção radiográfica está sujeita a erros principalmente devido a fadiga visual e distrações naturais devido a repetitividade e monotonia inerentes à essa atividade. No presente trabalho, apresentam-se duas metodologias que têm por objetivo o auxílio e a automação da atividade

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Jašíček, Radek. "Projekt výrobní linky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254310.

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This thesis describes the methods and procedures used in designing production lines, focusing on the production line for machining of train wheels. The thesis also describes the basic types of railway wheels, their design and important design elements. It also deals with the complete manufacturing process of train wheel from material selection through the technological processes of forming, heat treatment, mechanical tests, machining and non-destructive testing and measuring. Suitable equipment for the construction of automatic lines for machining, inspection and measurement of train wheels is

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Шевченко, Олександр Іванович. "Інтегральні методи визначення фізичних властивостей чавуну, хрому та їх покриттів для контролю структури і міцності виробів". Doctoral thesis, Київ, 2015. https://ela.kpi.ua/handle/123456789/13795.

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Antelo, Junior Ernesto Willams Molina. "Estimação conjunta de atraso de tempo subamostral e eco de referência para sinais de ultrassom." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2616.

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CAPES<br>Em ensaios não destrutivos por ultrassom, o sinal obtido a partir de um sistema de aquisição de dados real podem estar contaminados por ruído e os ecos podem ter atrasos de tempo subamostrais. Em alguns casos, esses aspectos podem comprometer a informação obtida de um sinal por um sistema de aquisição. Para lidar com essas situações, podem ser utilizadas técnicas de estimativa de atraso temporal (Time Delay Estimation ou TDE) e também técnicas de reconstrução de sinais, para realizar aproximações e obter mais informações sobre o conjunto de dados. As técnicas de TDE podem ser utiliza

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Cavallo, Giovanni. "Non destructive testing methods based on Terahertz radiation and Compressive Sampling." Tesi di dottorato, 2017. http://www.fedoa.unina.it/12140/1/Cavallo_Giovanni_30.pdf.

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A research contribution on non-destructive and non-invasive testing on avionics, metal and non-metal materials is presented. This is realized exploiting the combination of two topics, which over time have become increasingly popular, such as: Compressive Sampling and THz radiation. Specifically, an innovative approach has been developed, so-called CS-THz, that combines the possibility of irradiating with T-waves the sample under test and then realizing the process of capturing and reconstructing of the image through the CS principles. For this purpose, a CS-THz model has been developed, first

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Chu, Li Chih, and 朱立志. "A Comparative Study of the Non-destructive Testing Methods on Gas Pipelines in a Steel Manufacturing Plant." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/4k4e7v.

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碩士<br>弘光科技大學<br>環境工程研究所<br>103<br>Pipeline is a very important part in chemical process, since Kaohsiung gas explosion occurred which caused heavy casualties and property losses due to neglected pipeline management. Chemical pipeline management become imperative. The purpose of this study is to compare the applicability of four non-destructive testing methods applied on steel plant gas pipelines. Besides, ultrasonic testing method was used to measure the pipeline thickness in order to evaluate the remaining life and the schedule of replacing a new pipeline. In this study, two welding trace

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Βαβουράκης, Βασίλειος. "Χρήση μεθόδων συνοριακών στοιχείων και τοπικών ολοκληρωτικών εξισώσεων χωρίς διακριτοποίηση για την αριθμητική επίλυση προβλημάτων κυματικής διάδοσης σε εφαρμογές μη-καταστροφικού ελέγχου". Thesis, 2006. http://nemertes.lis.upatras.gr/jspui/handle/10889/845.

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Ο στόχος της παρούσας διδακτορικής διατριβής είναι διττός: η ανάπτυξη και η εφαρμογή αριθμητικών τεχνικών για την επίλυση προβλημάτων που εμπίπτουν στην περιοχή του Μη-Καταστροφικού Ελέγχου. Συγκεκριμένα αναπτύχθηκαν η Μέθοδος των Συνοριακών Στοιχείων (ΜΣΣ) και η Μέθοδος των Τοπικών Ολοκληρωτικών Εξισώσεων χωρίς Διακριτοποίηση για την αριθμητική ανάλυση στατικών και μεταβατικών προβλημάτων στο πεδίο της ελαστικότητας και της αλληλεπίδρασης ελαστικού με ακουστικό μέσο στις δύο διαστάσεις. Σημαντικό μέρος της διδακτορικής διατριβής αποτέλεσε η ανάπτυξη προγράμματος ηλεκτρονικού υπολογιστή, το οπ

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