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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Automated visual inspections for final assembly : A case study of cab assembly at Scania Oskarshamn / Automatiserade visuella inspektioner för slutmontering : En fallstudie på hyttmontering hos Scania i Oskarshamn

Johnson, Amos, Aronsson, Hannes January 2020 (has links)
Quality inspections have seen varying degrees of automation depending on the complexity of the task and the environment. Especially in later phases of multi-stage manufacturing processes, such as final assembly in automotive industries, quality inspections are largely manual to this day. Today, emerging technologies offer both pressures and tools to increase automation. However, the current state of the research field is lacking in studies that help guide companies toward implementation. Thus, quality managers at final assembly for Scania's truck coachwork factory in Oskarshamn (MC) stipulated a thesis assignment to explore how inspections in their final assembly workshop could be automated. This assignment constitutes the purpose of this thesis project - to provide an exploratory study into existing and emerging technologies that enable automation of quality inspections at MC. This was eventually delimited to exploring automated visual inspection technologies. In order to better understand Scania's inspection and manufacturing system, a series of interviews and shadowings were undertaken with appropriate respondents. From these, we were able to extract seven inspection system requirements, most important were the ability to (1) handle high variability, (2) add new inspections fast, (3) inspect in direct flow and (4) inspect inside and outside of the truck coach without disassembly. Then, a thorough and comprehensive review of 559 active inspections allowed us to categorize and map the nature of inspections at MC. In our literature review, a model for a general quality inspections was found, which was used to guide and ground our proposals and recommendations as well as provided intuitive illustration. Further, two paradigms emerged as most interesting for this project: machine vision and deep learning. A theoretical comparison of the two suggested that the more traditional, rule-based machine vision algorithms would struggle in accommodating the requirements previously found. However, we could infer that deep learning would be highly suitable with respect to MC's requirements and inspections. A prototype deep learning inspection system gave further validation toward our speculations that deep learning offered the greatest potential for automation in complex environments such as MC's. Although this thesis was created for Scania as a primary customer, important theoretical and practical contributions were developed for a more general audience. Firstly, the exploration into new avenues for automation that overcome their traditional limitations were provided; something that is of high current import given the trends toward more complex manufacturing settings. Practically, we provide some guidance to industries that find themselves in similar situations to Scania - employing complex manufacturing systems or having complex products - where our findings can give insights in regards to modern automation challenges and solutions. / Kvalitetsinspektioner har automatiserats i variarande grad beroende på uppgiftens och omgivningens komlexitet. I synnerhet i de senare stadierna av flerstegsproduktioner, exempelvis slutmontering i fordonstillverkningsindustrin, består manuella inspektioner i stor utsträckning. Den snabba tekniska utvecklingen som har skett nyligen avger både ett tryck och skapar verktyg för att utöka automatiseringen. Dessvärre erbjuder dagslägets forskning föga stöd till företag gällande storskalig implementering av automatiserade kvalitetsinspektionssystem. Därför skapade kvalitetschefer på Scanias lastbilshyttmonteringsfabrik i Oskarshamn (MC) ett uppdrag att utforska hur deras inspektioner skulle kunna automatiseras. Detta uppdrag utgjorde syftet i vårt examensarbete: att utföra en explorativ studie inom befintliga och nya tekniker som möjliggör automatisering av MCs kvalitetsinpspektioner, vilket senare avgränsades till undersökandet av visuella kvalitetsinspektioner. För att tillgodogöra oss en djupare förståelse för Scanias inspektions- och produktionssytem utfördes en serie intervjuer och skuggningar med kunniga respondenter. Datan som erhölls utgjorde grunden i en nulägesanalys, från vilken sju systemkrav för ett inspektionssystem på MC kunde extraheras. De viktigaste av dessa var förmågan att (1) klara av hög variation, (2) addera nya inspektionspunkter snabbt, (3) kontrollera i direktflödet och (4) kontrollera innan- och utanför lastbilshytten. Vidare gjordes en omfattande genomgång av 559 aktiva inspektionspunkter vilket resulterade i en kategorisering och kartläggning av inspektioner på MC. I vår genomgång av relevant vetenskaplig litteratur hittades en generell modell för kvalitetskontroll som användes för att illustrera och teroretiskt förankra rekommendationer för ett automatiskt inspektionssystem. Vidare urskiljdes två intressanta områden i forskningen, machine vision och deep learning. En teoretisk jämförelse av traditionella regelbaserade machine vision algoritmer med deep learning erhöll att den förstnämnda är mindre lämpad för Scania med hänsyn till de krav som tagits fram. Deep learning å andra sidan, erbjuder många fördelar i relation till dessa. Genom en relativt enkel process kunde en deep learning baserad prototyp utvecklas. Prototypen påvisade goda resultat och gav vidare validering av vår spekulation att deep learning är ett lämpligt verktyg för automatisering i komplexa miljöer.Trots att detta examensarbete hade Scania som huvudsaklig uppdragsgivare så gjordes viktiga teoretiska och praktiska bidrag. En utforskning av i nya möjligheter för automatisering som kan överkomma begränsningarna av traditionell automatisering framtogs, vilket anses som både aktuellt och av vikt för samtiden där trender går mot mer dynamiska produktionssystem. Vad gäller praktiska bidrag så utgör denna rapport en sammanställning av råd till företag som befinner sig i liknande sitser som Scania - som använder komplexa produktionssystem eller har komplexa produkter - där våra resultat kan ge insikt gällande svårigheter och lösningar för modern automatisering.
2

Problematika etiky v profesionálním chování inspektora sociálních služeb v rezidenčních zařízeních / Problems of the ethics of the social service inspector's professional behaviour in the residential facilities

Sládek, Miloš January 2012 (has links)
The presented dissertation is concerned with the ethic features of the quality of the social services inspectors professional behaviour in the residental facilities. This dissertation is divided into two main parts. The first part comprises theoretical bases related to given problems with the analysis of the relevant professional literature. The other part comprises with the actual research, the aim of which was finding ethical contexts of the inspection performance, inspector's education in the ethics, ethic code of the inspectors, the inspector profession and the value preferences of the inspectors. The main target is to analyze the ethical connections during the ispection performance in chosen residential facilities of the social services. In the research the quantitative and qualitative methods, the questionnaire survey and structural interviews were used. Based on the synthesis of the acquired knowledge the dissertation presents a view of the ethics application in professional activities of the inspectors. Key words: social services, quailty standards, quality inspections, values, ethics, the ethic code, career of the inspector, residential social services.
3

Problematika etiky v profesionálním chování inspektora sociálních služeb v rezidenčních zařízeních / Problems of the ethics of the social service inspector's professional behaviour in the residential facilities

Sládek, Miloš January 2012 (has links)
The presented dissertation is concerned with the ethic features of the quality of the social services inspectors professional behaviour in the residental facilities. This dissertation is divided into two main parts. The first part comprises theoretical bases related to given problems with the analysis of the relevant professional literature. The other part comprises with the actual research, the aim of which was finding ethical contexts of the inspection performance, inspector's education in the ethics, ethic code of the inspectors, the inspector profession and the value preferences of the inspectors. The main target is to analyze the ethical connections during the ispection performance in chosen residential facilities of the social services. In the research the quantitative and qualitative methods, the questionnaire survey and structural interviews were used. Based on the synthesis of the acquired knowledge the dissertation presents a view of the ethics application in professional activities of the inspectors. Key words: social services, quailty standards, quality inspections, values, ethics, the ethic code, career of the inspector, residential social services.
4

Skladová a expediční hala včetně rekonstrukce-stavebně technologický projekt / Storage and dispatch hall including the reconstruction - building-technology project

Toman, Jan January 2014 (has links)
Subject of this thesis is construction technology project storage and dispatch hall in Třebíč. This thesis contains technical report, construction site equipment project, time and financial plan, bill of quantities, technology study of the major technology stages, mechanical assembly design, technological specification, quality inspections.
5

Výrobní hala nástrojárny firmy TOKOZ - stavebně technologický projekt / Production hall of toolmaking company TOKOZ - Construction and technology project

Chytal, Roman January 2015 (has links)
The thesis is focused on building technology solutions construction production hall toolmaking of company TOKOZ,a.s. in Žďár nad Sázavou. This thesis contains technical report, construction site equipment project, time and financial plan, bill of quantities, technology study of the major technology stages, mechanical assembly design, technological specification, quality inspections and risks in the implementation of ground works.

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