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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

Diretrizes para implementação de fluxo continuo na construção civil : uma abordagem baseada na mentalidade enxuta / Guidelines for the implementation of continuous flow in the construction industry : an approach based on lean thinking

Bulhões, Iamara Rossi 13 August 2018 (has links)
Orientador: Flavio Augusto Picchi / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo / Made available in DSpace on 2018-08-13T21:18:03Z (GMT). No. of bitstreams: 1 Bulhoes_IamaraRossi_D.pdf: 3095643 bytes, checksum: f334cd2fe1eec7e0b2f48cca80f0b04b (MD5) Previous issue date: 2009 / Resumo: Os sistemas de produção na construção civil são caracterizados por muitas interrupções nos seus fluxos de trabalho, gerando desperdícios e a subutilização de recursos. Tais interrupções ocorrem principalmente devido à alta variabilidade nos processos de produção e à falta de sincronização entre os mesmos, resultando em elevadas percentagens de tempos improdutivos e de grandes estoques em processo. O presente trabalho tem como objetivo propor diretrizes para a implementação de fluxo contínuo na construção civil, com base nos conceitos e ferramentas da Mentalidade Enxuta. A estratégia de pesquisa adotada foi a pesquisa-ação, sendo realizados quatro estudos empíricos, dois em obras de edificações e dois em obras de montagem de estruturas pré-fabricadas de concreto. Duas principais contribuições desta pesquisa podem ser destacadas: (a) as diretrizes para implementar fluxo contínuo, vinculadas às etapas de diagnóstico, criação de condições iniciais, e planejamento e controle da produção; e (b) uma contribuição teórica no sentido de entender um conjunto de conceitos e princípios básicos de gestão da produção e a sua aplicação na indústria da construção. As diretrizes propostas para o contexto de obras de edificações são focadas no sistema de planejamento e controle da produção e na adaptação das ferramentas da Mentalidade Enxuta, tais como Mapa de Fluxo de Valor, Gráfico do Balanceamento do Operador e Tabela do Trabalho Padronizado Combinado, enquanto no contexto de obras de montagem de estrutura pré-fabricada as diretrizes enfatizam a realização do diagnóstico do processo de montagem, a introdução do planejamento integrado do projeto, fabricação e montagem, e a redução do tamanho do lote. Através destas diretrizes propõe-se o uso combinado das ferramentas tradicionais da Mentalidade Enxuta com ferramentas de Planejamento e Controle da Produção adequadas ao ambiente da construção civil. / Abstract: Production systems in the construction industry face many interruptions in work flows, causing waste and under-utilization of resources. Such interruptions are mostly due to high variability in production processes and also to the lack of synchronization between them, resulting in a large percentage of unproductive time and a high level of work in progress. The aim of this research work is to propose guidelines for the implementation of continuous flow in the construction industry, based on the Lean Thinking concepts and tools. Action research was the research strategy adopted in this study, involving four empirical studies, two in building projects and two in the fabrication and assembly of pre-fabricated concrete structures. Two main contributions of this research work are pointed out: (a) a set of guidelines for implementing continuous flow in production systems in the construction industry, which were related to the stages of diagnosis, establishment of the initial conditions, and planning and control; and (b) a theoretical contribution in terms of understanding a set of core production management concepts and principles and its application in the construction industry. The guidelines proposed for the context of building projects are focused on the production planning and control system and on the adaptation of Lean Thinking tools, such as Value Stream Mapping, Operator Balance Chart and Combined Standardized Work Chart, while in the context of prefabrication and assembly of concrete structures the guidelines emphasize the diagnosis of the assembly process, the introduction of an integrated planning and control process, including design prefabrication and assembly, and the reduction of lot size. Through those guidelines, the combined use of traditional Lean Thinking tools and planning and control tools that are suitable for the construction industry context. / Doutorado / Edificações / Doutor em Engenharia Civil
2

Automation of Fused Filament Fabrication : Realizing Small Batch Rapid Production / Automatisering av Fused Filament Fabrication : Ett sätt att förverkliga snabb småserietillverkning

ANDERSSON, AXEL January 2021 (has links)
In this bachelor thesis, I examine how automation of fused filament fabrication (FFF) can be implemented, and what the limitations are for different kinds of automation solutions for FFF. Fused filament fabrication is a 3D-printing technology where a material is extruded through a nozzle, layer by layer, to create a print. The thesis also provides a calculation for the commercial feasibility of small batch rapid production with the implementation of an automation solution for FFF. The approach was a qualitative study containing five interviews, combined with empirical knowledge and data from the additive manufacturing company Svensson 3D. This was complemented with an analysis of which criteria to use when evaluating FFF automation solutions, and a framework for looking at FFF from an operator perspective. To calculate commercial feasibility of automation solutions for FFF, Internal Rate of Return and Payback Time were used. This resulted in six criteria to evaluate solutions for automation of FFF, three evaluations of problems within three solutions for automation of FFF, and a finding showing that small batch rapid production is commercially feasible with automated FFF. Lastly, the thesis contains a discussion regarding what the future is for FFF, and the limitations of the framework presented for evaluating automated FFF systems. Possible promising solutions for automated FFF are presented, together with ideas for how design for additive manufacturing can help shape the future of automated FFF. / I det här kandidatarbetet undersöker jag hur automatisering inom fused filament fabrication (FFF) kan implementeras, och vad begränsningarna är för olika sorters automatiseringslösningar för FFF. Det läggs även fram en uträkning för den kommersiella gångbarheten för small batch rapid production med implementeringen av ett automatiskt FFF-system. Tillvägagångsättet bestod av en kvalitativ studie baserad på fem intervjuer, kombinerad med empirisk kunskap och data från additiva tillverkningsföretaget Svensson 3D. Det här kompletterades med en analys av vilka parametrar som bör användas för att utvärdera lösningar för FFF-automatisering, och ett ramverk där automatiseringslösningarna betraktas ur ett operatörs-perspektiv. För att räkna ut den kommersiella gångbarheten för automatiseringslösningar av FFF användes internränta och återbetalningstid. Det här resulterade i sex parametrar för att utvärdera automatiseringslösningar för FFF, tre utvärderingar av vilka problem som finns i tre existerande automatiseringslösningar, och slutsatsen att small batch rapid production är kommersiellt gångbart för automatiserad FFF. Slutligen innehåller arbetet en diskussion gällande framtiden för FFF och begränsningarna hos det ramverk som presenterades för att utvärdera automatiserade FFF system. Möjliga lovande lösningar för automatiserad FFF presenteras och hur design för additiv tillverkning kan hjälpa till att forma framtiden för automatiserad FFF.

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