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Bajic, Eddy. "Intégration du contrôle qualité en production automatisée : application à un îlot automatisé de fabrication de pièces mécaniques". Nancy 1, 1988. http://www.theses.fr/1988NAN10015.
Pełny tekst źródłaChouhad, Hassan. "Towards online metrology for proactive quality control in smart manufacturing". Thesis, Paris, HESAM, 2022. http://www.theses.fr/2022HESAE021.
Pełny tekst źródłaIn the traditional manufacturing industry, metrology is an essential element in sanctioning quality at the end of the production line. The innovation brought by concept of smart manufacturing leads to a repositioning of metrology to be proactive at the heart of production by performing the so-called first-time-right manufacturing of parts. The goal of this thesis is therefore to propose a methodological approach for the development of a proactive system, enhanced by AI models, to control the conformity of a product to a specification during machining and to characterize its defects. For this purpose, a first study on the surface aspect was carried out by collecting high-resolution images of coated and cut copper wires that may present defects. The images, taken by a computer vision system based on chromatic confocal imaging, were used to generate different artificial intelligence models. These models can perform segmentation and classification of observed defects. When comparing the accuracy and processing time of the AI models, transfer learning using the mobile-net model showed better performance. To extend the study of surface quality assessment, surface profile measurements on machine tools were performed using non-contact chromatic confocal sensors. Two approaches were performed: i) milling aluminum without tool wear signature, and ii) milling titanium with tool wear signature. In both cutting configurations, machining parameters, surface roughness profiles, and cutting forces were measured to build a dataset for training the prediction models by machine learning. The results showed that the XGboost model presented the best prediction performance and for both scenarios i) and ii). By considering the cutting time in titanium milling, the autoregressive integrated moving average time series prediction model was applied to track the evolution of roughness with tool wear
Mawissi, Kwamivi. "Modèles de représentation et de définition d'outillages de forme complexe : application à le génération automatique de processus d'usinage". Cachan, Ecole normale supérieure, 1995. http://www.theses.fr/1995DENS0001.
Pełny tekst źródłaMotta, Mariane Prado. "Contribution à l’étude de systèmes de surveillance de l'usinage basés sur des méthodes d‘apprentissage machine et des mesures de vibrations, efforts et température de coupe". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0296.
Pełny tekst źródłaMachining is an economically important manufacturing process that relies on the use of a sharpened cutting tool to mechanically cut and remove material from a part to achieve a desired geometry. Given the ever-increasing demands for quality, product variability and cost reduction, tool condition and workpiece quality monitoring systems based on artificial intelligence (AI) techniques are a potential solution are a potential solution for a more reliable and economical manufacturing processes. Recent developments in the field of AI, have shown great potential to transform the manufacturing domain with advanced tools dedicated to data analysis and modeling. In particular, supervised machine learning (ML) algorithms are a powerful tool for modeling complex relationships between input and output variables based on a dataset containing examples, i.e., input-output pairs. Nevertheless, one of the main drawbacks of these modeling techniques is that a large amount of data, usually obtained through experiments (often long and expensive to perform), is required to train accurate and reliable models. This fact limits the applicability of these types of models in an industrial context. Considering this context, this study aims to contribute to the identification of methodologies for the development of ML models dedicated to machining monitoring within industrial conditions, in which time and resources for the realization of experiments are often limited. For this purpose, it is considered in this study that, although experiments can be onerous, in the industry it is common that, before starting large scale machining productions with a new tool or material, setup experiments are performed to determine the most appropriate cutting parameters to perform that production. Given this need (or recommendation), it will be investigated in this thesis, the predictive performances that can be achieved if data, obtained from these tuning experiments, are used to generate predictive models for machining monitoring. More precisely, setting experiments from the standardized methodology Couple Tool-Material protocol (NF E 66-520) are considered. In an effort to obtain good predictive performance with a limited amount of experimental data, sensors for measuring cutting forces, temperature and vibrations are chosen as instrumentation for the monitoring system to be developed, given its close relationship with the kinematics of the machining process. In this matter, special attention is given to the feature engineering step. That is, the process of transforming the available raw data, for example, the signals recorded by the sensors, into features, i.e., information, that more accurately represent the problem underlying the predictive model. Finally, since in the industry the changes in cutting tool reference can occur quite often, it will also be investigated whether the models developed for a given target tool can be applied to other slightly different tools (variations on nose radius, substrate and coating) and whether, for the training of ML models, the use of larger databases, but containing observations related not only to the target tool but also to other tools slightly different from it, will be more advantageous, compared to the use of a smaller database specific to the target tool
Dutilh, Vincent. "Maîtrise de l'intégrité de surface par la surveillance d'usinage sur les pièces critiques en superalliage de turbomoteurs aéronautiques". Phd thesis, Toulouse, INPT, 2011. http://oatao.univ-toulouse.fr/15642/1/Dutilh.pdf.
Pełny tekst źródłaRemenaric, Hajak Mateja. "Study of ribonucleoprotein particle biogenesis and quality control by a novel technique using bacterial Rho factor as a tool". Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2013/document.
Pełny tekst źródłaIn eukaryotes, the genetic information is transcribed into messenger RNA which undergoes various processing and assembly events prior to its export from the nucleus. These transcript modifications are performed by numerous protein factors recruited to the nascent transcript, thus making a messenger ribonucleoprotein particle (mRNP). mRNP biogenesis is tightly interconnected with both transcription and quality control to ensure efficiency and accuracy in production of mature mRNPs. Recent findings suggest that members of THO-Sub2 complex might be crucial factors in coupling transcription, mRNP biogenesis and export. In our group, we have implemented an innovative assay to study mRNP biogenesis and quality control, based on the expression of the bacterial factor Rho in Saccharomyces cerevisiae. Rho interferes with proper mRNP assembly and generates aberrant transcripts degraded by the nuclear degradation machinery. In this study, we use Rho experimental system to expand our findings on Rrp6 and exosome involvement in quality control degradation of transcripts, as well as to better characterize the role and function of THO-Sub2 complex in the process of mRNP biogenesis. Obtained results reveal an interesting difference in behavior of THO complex members upon Rho action and disclose their dependence on binding to the RNA, which could not be observed by other experimental techniques. This substantiates the expected potential of Rho-based experimental system in the study of protein factors involved in mRNP biogenesis and quality control
Cassady, Charles Richard. "Statistical quality control techniques using multilevel discrete product quality measures". Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-06062008-151120/.
Pełny tekst źródłaGosselin, Ryan. "ON-LINE QUALITY CONTROL IN POLYMER PROCESSING USING HYPERSPECTRAL IMAGING". Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/26629/26629.pdf.
Pełny tekst źródłaThe use of plastic composite materials has been increasing in recent years in order to reduce the amount of material used and/or use more economic materials, all of which without compromising the properties. The impressive adaptability of these composite materials comes from the fact that the manufacturer can choose the raw materials, the proportion in which they are blended as well as the processing conditions. However, these materials tend to suffer from heterogeneous compositions and structures, which lead to mechanical weaknesses. Product quality is generally measured in the laboratory, using destructive tests often requiring extensive sample preparation. On-line quality control would allow near-immediate feedback on the operating conditions and may be transferrable to an industrial production context. The proposed research consists of developing an on-line quality control tool adaptable to plastic materials of all types. A number of infrared and ultrasound probes presently exist for on-line composition estimation, but only provide single-point values at each acquisition. These methods are therefore less adapted for identifying the spatial distribution of a sample’s surface characteristics (e.g. homogeneity, orientation, dispersion). In order to achieve this objective, a hyperspectral imaging system is proposed. Using this tool, it is possible to scan the surface of a sample and obtain a hyperspectral image, that is to say an image in which each pixel captures the light intensity at hundreds of wavelengths. Chemometrics methods can then be applied to this image in order to extract the relevant spatial and spectral features. Finally, multivariate regression methods are used to build a model between these features and the properties of the sample. This mathematical model forms the backbone of an on-line quality assessment tool used to predict and optimize the operating conditions under which the samples are processed.
Binny, Diana. "Radiotherapy quality assurance using statistical process control". Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/130738/1/Diana_Binny_Thesis.pdf.
Pełny tekst źródłaFaust, Justin E. "Increase efficiency using the six sigma methodologies". Online version, 2009. http://www.uwstout.edu/lib/thesis/2009/2009faustj.pdf.
Pełny tekst źródłaMurphy, Terrence Edward. "Multivariate Quality Control Using Loss-Scaled Principal Components". Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-11222004-122326/unrestricted/murphy%5Fterrence%5Fe%5F200412%5Fphd.pdf.
Pełny tekst źródłaVictoria Chen, Committee Co-Chair ; Kwok Tsui, Committee Chair ; Janet Allen, Committee Member ; David Goldsman, Committee Member ; Roshan Vengazhiyil, Committee Member. Vita. Includes bibliographical references.
Al, Mohammad Badera. "Quantitative MRI quality control using the ACR phantom". Thesis, Boston University, 2010. https://hdl.handle.net/2144/31496.
Pełny tekst źródłaPLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.
Recently, many studies have used T1 and T2 quantitative MRI in examining the brain and other body structures, to evaluate and follow up diseases, or simply for better understanding of the human body. Quality control on MRI scanners has been performed since the early eighties and nowadays the ACR MRI phantom is being used for the accreditation of the scanners, and quality control of their qualitative performance. In this study the same phantom is being used to obtain quantitative values of three regions in the phantom that might be used as reference for quantitative quality control. The results of the scans provided quantitative values that can be used as reference for the quality control of qMRI, and there was no difference after scanning the same regions twice. Further study is recommended to provide quantitative values for different MRI scanners strength to assure the use of ACR phantom as a tool for quality control of qMRI scanners.
2031-01-01
Al, Mohammad Badera. "Quantitative MRI quality control using the ACR phantom". Thesis, Boston University, 2012. https://hdl.handle.net/2144/32037.
Pełny tekst źródłaPLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.
Recently, many studies have used T1 and T2 quantitative MRI in examining the brain and other body structures, to evaluate and follow up diseases, or simply for better understanding of the human body. Quality control on MRI scanners has been performed since the early eighties and nowadays the ACR MRI phantom is being used for the accreditation of the scanners, and quality control of their qualitative performance. In this study the same phantom is being used to obtain quantitative values of three regions in the phantom that might be used as reference for quantitative quality control. The results of the scans provided quantitative values that can be used as reference for the quality control of qMRI, and there was no difference after scanning the same regions twice. Further study is recommended to provide quantitative values for different MRI scanners strength to assure the use of ACR phantom as a tool for quality control of qMRI scanners.
2031-01-02
Kuong-Lau, Kok-kin. "Quality assurance resource allocation using expert opinion and optimization". Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/24331.
Pełny tekst źródłaFlores-Cerrillo, Jesus MacGregor John F. "Quality control for batch processes using multivariate latent variable methods /". *McMaster only, 2003.
Znajdź pełny tekst źródłaLönnroth, Viktor. "Improving quality control in automation projects using simulation systems". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-293928.
Pełny tekst źródłaAutomationssystem blir mer och mer integrerade i dagens samhälle. Systemens komplexitet ökar och med det karven på hög kvalitet under utvecklingen. Detta blir en utmaning för de företag som utvecklar systemen. En lösning som är på uppgång för detta är användningen av simulering och virtuell driftsättning. I denna rapport studeras processen för kvalitetskontroll och effektiv användning av simulering i utvecklingsprojekt av automationssystem. Fokus ligger på mjukvarudelen av systemen. Studien är gjord som en intervjustudie av personal från ett automationsutvecklings företag. Efter intervjuerna analyserades materialet och kombinerades med generella teorier om kvalitetskontroll och testning i mjukvaruutveckling. Processens tester kombinerades sedan med vad som krävs av en simulator för att utföra dessa. Resultatet av detta arbete är för det första en detaljerad bild av kvalitetskontrolls processen. Detta visar att systemen tests två gånger med samma testhierarki, först under utvecklingen och sedan under driftsättningen. Skillnaden är att under utvecklingen saknas den riktiga hårdvaran och process systemet vilket påverkar mjukvarans funktionalitet och begränsar testbarheten. Genom att använda simulering under utvecklingen kan skillnaden mellan systemen före och efter distribution vilket ökar kvaliteten. Överväganden gällande vilken nivå av simulering som behövs för att värdet av simulerings potentiella förmåga att ta bort fel skall bli göre en kostande för att utveckla simuleringen.
Gandharva, Kumar. "Study of Effect of Coverage and Purity on Quality of Learned Rules". University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1428048034.
Pełny tekst źródłaKo, Naonori. "Establishment of quality assurance and quality control measures for Boron Neutron Capture Therapy using microdosimetry". Kyoto University, 2020. http://hdl.handle.net/2433/253277.
Pełny tekst źródłaVera, Carrasco Luciano. "Sensory quality control of alcoholic beverages using fast chemical sensors". Doctoral thesis, Universitat Rovira i Virgili, 2010. http://hdl.handle.net/10803/9061.
Pełny tekst źródłaEn la presente tesis Doctoral, han sido aplicados dos sensores artificiales para el análisis de
bebidas alcohólicas: la nariz electrónica basada en la espectrometría de masas (MS) y la lengua
electrónica basada en la espectroscopía infrarroja con transformada de Fourier (FTIR). El
propósito fue desarrollar nuevas estrategias para analizar la autenticidad de estos productos,
desde un punto de vista sensorial, por medio de técnicas las espectrales antes mencionadas.
Adicionalmente, ha sido utilizado un espectrofotómetro UV-visible como ojo electrónico. El
trabajo presentado pretende ser un avance significativo hacia el desarrollo de un catador
electrónico mediante la fusión de los tres sensores químicos: nariz electrónica, lengua
electrónica y ojo electrónico.
Sensory quality control of alcoholic beverages using fast chemical sensors
In the present Doctoral Thesis, two chemical artificial sensors are applied to the analysis of
alcoholic beverages: the Mass Spectrometry (MS)-based electronic-noses and Fourier
transform infrared (FTIR)-based electronic-tongue. The aim was developing new strategies to
test the authenticity of these products, from a sensory point of view, by means of the spectral
techniques above mentioned. Additionally, has been used an UV-visible spectrophotometer as
electronic eye. The work presented wants to be a significant advance towards the development
of an electronic taster through the fusion of three chemical sensors: electronic nose, electronic
tongue and electronic eye.
Zhuohua, Qu. "Analytical quality control in shipping operation using six sigma principles". Thesis, Liverpool John Moores University, 2015. http://researchonline.ljmu.ac.uk/4520/.
Pełny tekst źródłaDou, Yuchu. "Quantification and Quality Control of Extracellular Vesicles Using Capillary Electrophoresis". Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41015.
Pełny tekst źródłaWang, Duan Qiang. "Strain measurement using neutron diffraction". Thesis, Open University, 1996. http://oro.open.ac.uk/57651/.
Pełny tekst źródłaSaxena, Abhinav. "Online web monitoring of card-spinning using image analysis". Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/8261.
Pełny tekst źródłaJoyappa, Pallavi. "Pre production planning and leadtime reduction using Six Sigma". Online version, 2004. http://www.uwstout.edu/lib/thesis/2004/2004joyappap.pdf.
Pełny tekst źródłaMascolo, Rafael. "Concreto usinado : análise da variação da resistência à compressão e de propriedades físicas ao longo da descarga do caminhão betoneira". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/75771.
Pełny tekst źródłaThe crescent utilization of concrete which in terms of volume, is the most produced product in the world, added to the pressure of the market to reduce the costs and maintenance of the safety minimum requirements of a project, make a direct impact on the material quality control’s importance and necessity. For ready-mixed concrete, mostly seen in large urban centers, the initial and final 15% usage of its total volume is not recommended by the country standards for test purposes. However, due to the ease, it is a common practice in construction sites of the region to collect samples once the first portion of the concrete is unloaded. Taking into account such procedure, which does not meet the standards recommended, added to the lack of standardization to assess the quality of the concrete mixer, the uniformity of the concrete mixture and the importance of the quality control tests of concrete under the safety of structures, the purpose of this research is to analyze the variations of the concrete strength when compressed and its physical properties along the discharge of the mixture made in a mixer truck. In order to achieve the proposed goal, there were sampling carried out at five different points along the discharge from the concrete mixer truck, for each of the 65 lots (batches) analyzed, considering three different types of concrete. Each sampling collected was analyzed by going through a slump test, compression strength and granulometry analysis. Statistically, it was proven that the sample point collection variation of some of the batches influences the compression strength, on the other hand the same cannot be found considering the ABECE criteria, used as analysis parameter in the absence of specific regulations for the subject. No representative profile of resistance variations based on the sample collection point was formed, in contrast to the coarse aggregate content, in which profile can be clearly seen a concentration of gravels at the extreme points, at the commencement and the end of the sample collection. Regarding its consistency, on the whole, there was a reduction from the initial and to the end point, respecting the regulations standards.
Guerra, Marcelo Del. "Desenvolvimento de apalpador de contato elétrico (\"touch trigger probe\") para atuação no processo de torneamento". Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-12022016-174015/.
Pełny tekst źródłaThe use of touch trigger probes attached to CNC machines has become a world standard, especially due the reduction of setup time and the ability to promote work piece measurements on machine. However, some barriers like measurement routines programming difficulties, high costs of these equipments and the low number of technical literature about this subject, still need to be transposed. This work presents a review on the applications of touch trigger probes on companies shop floor, discussing the nowadays technologies used to generate the trigger signal. A new touch trigger probe model based on a simple electrical contact is specially developed to provide the measuring characteristics required for Lathes, with the needed characteristics and low cost. The tests of the probe developed in the laboratory shown a repeatability of 0,003 mm (more and less 3 \'sigma\' or 99,73%). Those characteristics are high compatible with the most needs of the industry.
Heidari, Fariba. "Quality of service routing using decentralized learning". Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115672.
Pełny tekst źródłaWe investigate the performance degradation due to decentralized routing as opposed to centralized optimal routing policies in practical scenarios. The system optimal and the Nash bargaining solutions are two centralized benchmarks used in this study. We provide nonlinear programming formulations of these problems along with a distributed recursive approach to compute the solutions. An on-line partially-decentralized control architecture is also proposed to achieve the system optimal and the Nash bargaining solution performances. Numerical results in some practical scenarios with well engineered networks, where the network resources and traffic demand are well matched, indicate that decentralized learning techniques provide efficient, stable and scalable approaches for routing the bandwidth guaranteed paths.
In the context of on-line learning, we propose a new algorithm to track the best action-selection policy when it abruptly changes over time. The proposed algorithm employs change detection mechanisms to detect the sudden changes and restarts the learning process on the detection of an abrupt change. The performance analysis of this study reveals that when all the changes are detectable by the change detection mechanism, the proposed tracking the best action-selection policy algorithm is rate optimal. On-line routing of bandwidth guaranteed paths with the potential occurrence of network shocks such as significant changes in the traffic demand is one of the applications of the devised algorithm. Simulation results show the merit of the proposed algorithm in tracking the optimal routing policy when it abruptly changes.
Conde, Erick F. "Environmental Sensor Anomaly Detection Using Learning Machines". DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/1050.
Pełny tekst źródłaChang, Xiaolin. "On improving Internet quality of service using a control theoretic approach /". View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?COMP%202005%20CHANG.
Pełny tekst źródłaRohani, Mehdiabadi Behrooz. "Power control for mobile radio systems using perceptual speech quality metrics". University of Western Australia. School of Electrical, Electronic and Computer Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0174.
Pełny tekst źródłaAl-Saedi, Waleed Abood Baddai. "Optimal Control of Power Quality in Microgrids Using Particle Swarm Optimisation". Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2013. https://ro.ecu.edu.au/theses/611.
Pełny tekst źródłaShah, Parthiv Akshay. "Forecasting using the T-method". Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Shah_Parthiv_09007dcc80681cd6.pdf.
Pełny tekst źródłaVita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed June 18, 2009) Includes bibliographical references (p. 36-37).
Wilburn, Cathy A. "Using the Design Metrics Analyzer to improve software quality". Virtual Press, 1994. http://liblink.bsu.edu/uhtbin/catkey/902489.
Pełny tekst źródłaDepartment of Computer Science
Ben, Boubaker Moez, i Boubaker Moez Ben. "Non-destructive quality control of carbon anodes using modal analysis, acousto-ultrasonic and latent variable methods". Doctoral thesis, Université Laval, 2017. http://hdl.handle.net/20.500.11794/27843.
Pełny tekst źródłaLa performance des cuves d’électrolyse utilisées dans la production d’aluminium primaire par le procédé Hall-Héroult est fortement influencée par la qualité des anodes de carbone. Celles-ci sont de plus en plus variables en raison de la qualité décroissante des matières premières (coke et braie) et des changements de fournisseurs qui deviennent de plus en plus fréquents afin de réduire le coût d’achat et de rencontrer les spécifications des usines. En effet, les défauts des anodes, tels les fissures, les pores et les hétérogénéités, causés par cette variabilité, doivent être détectés le plus tôt possible afin d’éviter d’utiliser des anodes défectueuses dans les cuves et/ou d’apporter des ajustements au niveau du procédé de fabrication des anodes. Cependant, les fabricants d’anodes ne sont pas préparés pour réagir à cette situation afin de maintenir une qualité d'anode stable. Par conséquent, il devient prioritaire de développer des techniques permettant d’inspecter le volume complet de chaque anode individuelle afin d’améliorer le contrôle de la qualité des anodes et de compenser la variabilité provenant des matières premières. Un système d’inspection basé sur les techniques d’analyse modale et d’acousto-ultrasonique est proposé pour contrôler la qualité des anodes de manière rapide et non destructive. Les données massives (modes de vibration et signaux acoustiques) ont été analysées à l'aide de méthodes statistiques à variables latentes, telles que l'Analyse en Composantes Principales (ACP) et la Projection sur les Structures Latentes (PSL), afin de regrouper les anodes testées en fonction de leurs signatures vibratoires et acousto-ultrasoniques. Le système d'inspection a été premièrement investigué sur des tranches d'anodes industrielles et ensuite testé sur plusieurs anodes pleine grandeur produites sous différentes conditions à l’usine de Alcoa Deschambault au Québec (ADQ). La méthode proposée a permis de distinguer les anodes saines de celles contenant des défauts ainsi que d’identifier le type et la sévérité des défauts, et de les localiser. La méthode acousto-ultrasonique a été validée qualitativement par la tomographie à rayon-X, pour les analyses des tranches d’anodes. Pour les tests réalisés sur les blocs d’anode, la validation a été réalisée au moyen de photos recueillies après avoir coupé certaines anodes parmi celles testées.
The performance of the Hall-Héroult electrolysis reduction process used for the industrial aluminium smelting is strongly influenced by the quality of carbon anodes, particularly by the presence of defects in their internal structure, such as cracks, pores and heterogeneities. This is partly due to the decreasing quality and increasing variability of the raw materials available on the market as well as the frequent suppliers changes made in order to meet the smelter’s specifications and to reduce purchasing costs. However, the anode producers are not prepared to cope with these variations and in order to maintain consistent anode quality. Consequently, it becomes a priority to develop alternative methods for inspecting each anode block to improve quality control and maintain consistent anode quality in spite of the variability of incoming raw materials.A rapid and non-destructive inspection system for anode quality control is proposed based on modal analysis and acousto-ultrasonic techniques. The large set of vibration and acousto-ultrasonic data collected from baked anode materials was analyzed using multivariate latent variable methods, such as Principal Component Analysis (PCA) and Partial Least Squares (PLS), in order to cluster the tested anodes based on vibration and their acousto-ultrasonic signatures. The inspection system was investigated first using slices collected from industrial anodes and then on several full size anodes produced under different conditions at the Alcoa Deschambault in Québec (ADQ). It is shown that the proposed method allows discriminating defect-free anodes from those containing various types of defects. In addition, the acousto-ultrasonic features obtained in different frequency ranges were found to be sensitive to the defects severities and were able to locate them in anode blocks. The acousto-ultrasonic method was validated qualitatively using X-ray computed tomography, when studying the anode slices. The results obtained on the full size anode blocks were validated by means of images collected after cutting some tested anodes.
The performance of the Hall-Héroult electrolysis reduction process used for the industrial aluminium smelting is strongly influenced by the quality of carbon anodes, particularly by the presence of defects in their internal structure, such as cracks, pores and heterogeneities. This is partly due to the decreasing quality and increasing variability of the raw materials available on the market as well as the frequent suppliers changes made in order to meet the smelter’s specifications and to reduce purchasing costs. However, the anode producers are not prepared to cope with these variations and in order to maintain consistent anode quality. Consequently, it becomes a priority to develop alternative methods for inspecting each anode block to improve quality control and maintain consistent anode quality in spite of the variability of incoming raw materials.A rapid and non-destructive inspection system for anode quality control is proposed based on modal analysis and acousto-ultrasonic techniques. The large set of vibration and acousto-ultrasonic data collected from baked anode materials was analyzed using multivariate latent variable methods, such as Principal Component Analysis (PCA) and Partial Least Squares (PLS), in order to cluster the tested anodes based on vibration and their acousto-ultrasonic signatures. The inspection system was investigated first using slices collected from industrial anodes and then on several full size anodes produced under different conditions at the Alcoa Deschambault in Québec (ADQ). It is shown that the proposed method allows discriminating defect-free anodes from those containing various types of defects. In addition, the acousto-ultrasonic features obtained in different frequency ranges were found to be sensitive to the defects severities and were able to locate them in anode blocks. The acousto-ultrasonic method was validated qualitatively using X-ray computed tomography, when studying the anode slices. The results obtained on the full size anode blocks were validated by means of images collected after cutting some tested anodes.
Brooks, Christopher Richard. "Quantifying Appearance for Opaque Surfaces Using Spectral Bidirectional Reflectivity". BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7498.
Pełny tekst źródłaRainys, Algirdas. "Gaminio kokybės kontrolė taikant ultragarsą". Master's thesis, Lithuanian Academic Libraries Network (LABT), 2006. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20060613_122907-33316.
Pełny tekst źródłaWalia, Gursimran Singh. "Using error modeling to improve and control software quality an empirical investigation /". Diss., Mississippi State : Mississippi State University, 2009. http://library.msstate.edu/etd/show.asp?etd=etd-04032009-070637.
Pełny tekst źródłaBravaglieri, Lisa. "ClinQC: quality control of an X-ray imaging system using clinical images". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12172/.
Pełny tekst źródłaEira, da Costa Ana Carina. "Analysis of mitochondrial quality control using a Drosophila model of Parkinson's disease". Thesis, University of Leicester, 2013. http://hdl.handle.net/2381/28019.
Pełny tekst źródłaGhasemzadeh-Barvarz, Massoud. "Quality control of complex polymer materials using hyperspectral imaging associated with multivariate statistical analysis". Doctoral thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26025.
Pełny tekst źródłaIn the first step of this work, maleic anhydride grafted polyethylene (MAPE)/hemp fiber composites with different filler concentration between 0 to 60% were analyzed by NIR imaging. Three chemometrics methods including Partial Least Squares (PLS), Multivariate Curve Resolution (MCR) and Multivariate Image Analysis/Multivariate Image Regression (MIA/MIR) were implemented and compared for predicting mechanical properties as well as mapping chemical compositions and material physical variations. In the second part of this project, a series of complex multilayer films (industrial samples) were investigated using NIR hyperspectral imaging and Multivariate Image Analysis (MIA). The potential and effectiveness of the proposed method for detecting defects caused by missing layer(s) were studied for unprinted and printed films. In the final part, polypropylene (PP)/glass/flax hybrid composites were studied. The effect of composition (fiber content between 0 and 40 vol%), as well as water, thermal and UV aging on mechanical properties was investigated. Then, Scanning Electron Microscopy (SEM) images of unaged hybrid composites were analyzed using texture analysis and multivariate methods. Finally, NIR imaging was implemented on unaged and aged composites to predict their final properties as well as to capture chemical composition and aging variations. In summary, the results show that combining hyperspectral imaging and multivariate statistical methods is a powerful tool for quality control of complex polymer composites. Since the proposed method is rapid and nondestructive, one can implement it for on-line quality control of finished plastic products. On the other hand, texture analysis and multivariate methods can be applied for quantifying the mixing aspects of composites.
Potgieter, Nardus. "Analysis of beer aroma using purge-and-trap sampling and gas chromatography". Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-09282007-140010.
Pełny tekst źródłaMari, Joseph. "Using design for six sigma to design an equipment depot at a hospital". Diss., Online access via UMI:, 2007.
Znajdź pełny tekst źródłaChin, Bruce Lorenz. "An investigation in using artificial neural networks for quality control in the poultry industry". Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/17989.
Pełny tekst źródłaShobe, Kristin N. "Variable sampling intervals for control charts using count data". Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/52076.
Pełny tekst źródłaMaster of Science
Damineli, Bruno Luís. "Estudo de métodos para caracterização de propriedades físicas de agregados graúdos de resíduos de construção e demolição reciclados". Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3146/tde-09012008-120538/.
Pełny tekst źródłaThe low consumption of Construction and Demolition Waste (CDW) recycled aggregates happens, nowadays, because its natural variability and quality control absence that limit its use in applications with larger demands, such as concretes. One way of concrete aggregates control is done by determining its porosity, express by physical properties absorption and relative density. The method that measures its properties is the NM 53, standard derived from ASTM C127. But this standard was conceived to characterize natural aggregates, and is not appropriate on CDW recycled aggregates. In this way, the purpose of this work is to establish a quick and accurate method for quality control and selection of recycled aggregates in recycling plants, which could increase the possibilities of fields for its use. Thus, this work comparatively studied three distinct methods - NM 53, submerged mass in time and drying - for determining physical properties absorption and relative density of recycled aggregates. The experimental plannings were based on statistical models type Design of Experiments (DOE) that allow improvement on a selected process, in accordance with established needs, through analysis of possible significant variables for results. The adaption of NM 53 to recycled aggregates characterization depends on: 1) increase of sample pores saturation; 2) decrease of mass loss during the tests; and 3) increase of determination speed. After execution of experimental plannings, a new method for determining CDW coarse recycled aggregates physical properties could be proposed. This method statistically increased the measured absorption values (pores saturation increase), decreased mass loss during tests executions and reduced the characterization time from 48 hours (minimum used by NM 53) to approximately 4 hours. The method uses simple and low costs equipment, having real potential to be implemented for quality control of CDW recycled aggregates on recycling plants.
Jansson, Henrik. "Identification for control : using sensitivity information to improve quality of restricted complexity models". Licentiate thesis, KTH, Signals, Sensors and Systems, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1424.
Pełny tekst źródłaSierra, Cadavid Andrea. "Multicomponent Quality Control Analysis for the Tomato Industry Using PortableMid-Infrared (MIR) Spectroscopy". The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397132123.
Pełny tekst źródłaBhandari, Sumnima. "Quality improvement of product in plastics industry using six sigma approach". Online version, 2009. http://www.uwstout.edu/lib/thesis/2009/2009bhandaris.pdf.
Pełny tekst źródłaAriga, Eiji, Shigeki Ito, Shizuhiko Deji, Takuya Saze i Kunihide Nishizawa. "Development of dosimetry using detectors of diagnostic digital radiography systems". American Association of Physicists in Medicine, 2007. http://hdl.handle.net/2237/8818.
Pełny tekst źródłaArmstrong, Bruce. "Using digital image analysis for assessing the quality of wheat and barley". Thesis, University of Ballarat, 2004. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/60071.
Pełny tekst źródłaMaster of Applied Science by research