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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.

Process improvement in a third world organisation : a study from Sub Saharan Africa

Isaksson, Raine January 2001 (has links)
First World improvement theory has been tested in a Third World organisation. A First World improvement process has been defined as a tool for testing. The objective of this thesis is to answer the research question: How does a Third World environment influence the introduction and application of a First World improvement process? The proposed five-stage improvement process was applied in case studies, which examined the Companywide Process, Cement Packing and Quality Control. The conclusion is that a First World improvement process, with only minor changes, can operate successfully in a Third World environment, provided management is truly committed to the concept of improvement. / <p>Godkänd; 2001; 20070314 (ysko)</p>

Monitoring railway traffic loads using bridge weight-in-motion

Liljencrantz, Axel January 2007 (has links)
QC 20101111

Implementing FMEA for Scaling Start-ups : A Case Study of Adaptation for Overcoming Novel Technology Challenges

Kinisjärvi, Robert January 2023 (has links)
A start-up cannot simply be considered a smaller version of an established company. They often rely on short and informal development processes because they lack data and experience from implementing similar projects in the past. These factors are among those that lead to lower success in organizational performance and new product launches. The NPD process is well researched, but these studies are often on larger companies, and the applicability for start-ups is highly questionable. One of these NPD tools is the FMEA. FMEA has been proven and established for decades in various industries. However, these success scenarios often depend on sufficient resources in terms of staff and project budget. Start-ups often lack the resources to deal with major NPD project failures, which can be disastrous for their survival in their market. Despite the innovative benefits and economic growth that start-ups contribute to when they are successful with their NPD projects, there is little research on how established tools for large companies should be adapted. Therefore, these research questions were formulated to fill the gap in the current FMEA method: RQ1: What are the challenges for start-ups when implementing FMEA? RQ2: How can FMEA implementation be adapted for start-ups overcoming novel technology challenges?  The study consisted of a literature review and a case study. The literature review examined the key factors for FMEA implementation and the differences between start-ups and established companies. The challenges for start-ups implementing FMEA were the central question of the literature review. The case study was conducted in a start-up company. An adapted FMEA method and template were created there. A workshop and ten interviews were held with a variety of representatives. The results show that the biggest challenge for start-ups implementing FMEA is that it is too complex, unclear, and often too extensive. This can be changed by simplifying the FMEA, focusing on the critical risks, and ensuring that the sessions are not too long. The proposed FMEA method is easier to use with a simplified risk assessment and fewer columns. It was found that it also is equally important to train users, hold short meetings, and limit the size of each FMEA session.

Engineering rubber bushing stiffness formulas including dynamic amplitude dependence

Garcia, Maria-José January 2006 (has links)
Engineering design models for the torsion and axial dynamic stiffness of carbon black filled rubber bushings in the frequency domain including amplitude dependence are presented. They are founded on a developed material model which is the result of applying a separable elastic, viscoelastic and friction rubber component model to the material level. Moreover, the rubber model is applied to equivalent strains of the strain states inside the torsion or axial deformed bushing previously obtained by the classical linear theory of elasticity, thus yielding equivalent shear moduli which are inserted into analytical formulas for the stiffness. Therefore, unlike other simplified approaches, this procedure includes the Fletcher-Gent effect inside the bushing due to non-homogeneous strain states. The models are implemented in Matlab®. In addition, an experimental verification is carried out on a commercially available bushing thus confirming the accuracy of these models which become a fast engineering tool to design the most suitable rubber bushing to fulfil user requirements. Finally, they can be easily employed in multi-body and finite element simulations / QC 20101112

Processförbättring vid tillverkning av konstruktionskeramer

Garvare, Rickard January 1998 (has links)
This thesis is about implementing Design of Experiments in enterprises manufacturing high performance ceramics. The manufacturing of ceramics is a complex process which involves problems with variation in product properties and in process performance. Every system in operation generates information that can be used to improve it. To be able to improve, measurements must be made and recorded data must be transformed into information. Design of Experiments is about performing tests using a minimum of resources to receive a maximum of information about a process or a system. Today most of the development of processes and products is done supported by expensive, and often misleading, one-factor-at-a-time experiments. To examine the possibilities of facilitating implementation of Design of Experiments, case-studies of two Swedish manufacturers of high performance ceramics were carried out. A model of implementing Design of Experiments is presented based on theory and the case-studies. The proposed model consists of three major phases: 1.Planning and education. 2.Pilot project with new ways of working. 3.Assessment, maintenance and improvement. Design of Experiments appears to be a well suited technique for structuring the development of manufacturing high performance ceramics. The implementation of Design of Experiments could be facilitated by long-term planning for process improvement. To make assessment and evaluation possible, process performance should be documented not only after but also before an implementation takes place. Both knowledge about statistics and knowledge about the studied processes should be present in the teams carrying out experiments. / <p>Godkänd; 1998; 20070404 (ysko)</p>

Squat Detection in Railway Switches &amp; Crossings Using Point Machine Vibration

Zuo, Yang January 2022 (has links)
Railway switches and crossings (S&amp;Cs) are among the most important high-value components in a railway network and a single failure of such an asset could result in severe network disturbance, huge economical loss, and even severe accidents. Therefore, potential defects need to be detected at an early stage and the status of the S&amp;C must be monitored to prevent such consequences. One type of defect that can occur is called a squat. A squat is a local defect like a dent or an open pit in the rail surface. In this thesis, a testbed including a full-scale S&amp;C and a bogie wagon was studied. Vibrations were measured for different squat sizes by an accelerometer mounted at the point machine, while a boggy was travelling along the S&amp;C. A method of processing the vibration data and the speed data is proposed to investigate the feasibility of detecting and quantifying the severity of a squat. A group of features were extracted to apply isolation forest to generate anomaly scores to estimate the health status of the S&amp;C. One key technology applied is wavelet denoising. The study shows that it is possible to monitor the development of the squat size introduced in the test bed by measuring point machine vibrations. The relationships between the normalised peak-to-peak amplitude of the vibration signal and the squat depth were estimated. The results also show that the proposed method is effective and can produce anomaly scores that can indicate the general health status of an S&amp;C regarding squat defects.

Kartläggning och jämförelse av arbetssätt att hantera kvalitetsbristkostnader i logistikprocessen / Mapping and comparison of working methods to handle cost of poor quality in the logistics process

Hermansson, Joel, Gottschalk, Max January 2017 (has links)
This bachelor thesis has been done in cooperation with IKEA of Sweden in Älmhult. It is about a mapping and comparison study of how different companies handle their cost of poor quality (COPQ) in their logistics processes. In this study, we have collaborated with Electrolux, Gekås and Rusta. IKEA has a high COPQ, this means when poor quality occurs in their processes. This has attracted much attention in recent years and there is room for improvement. The part of the value chain chosen in this project is the logistics process. The purpose of this bachelor thesis is to map IKEA´s logistics process, then compare IKEA´s way of working with other companies through a benchmarking study and finally come up with areas for improvement. This gave the questions: How does IKEA's operate in their logistics process today and handle their cost of poor quality? How do our other partners operate and handle their logistics processes and cost of poor quality? What are the similarities and differences between the different companies? To find out how IKEA operates in their logistics process today, it was decided to make a corporate visit to one of IKEA's CDC:s. Here, a questionnaire has been used to get the information that was needed. Later this questionnaire formed the basis for the survey that was used to gather information from our other partners. To gather information from our partners, we have used benchmarking. This was done to see how our other partner organizations operate today and how they work accordingly to this study. The first step of the benchmarking, was to send out the survey to our partners. Later we followed up with personal interviews and visits. The collected data from the different companies formed the basis of the status report of them all. In the analysis, IKEA has been compared to each of our different partners and a summary of the analysis has been made. With the analysis finished, it has been clear that IKEA has some problems in their logistic process and that the cost of poor quality can decrease. This gave us some areas that IKEA can make improvements in. After that conclusion, forklift damages and packaging design are two areas that IKEA can make big improvements in. / Detta examensarbete har gjorts tillsammans med IKEA of Sweden i Älmhult. Det handlarom en kartläggning och jämförelse av hur olika företag hanterar sinakvalitetsbristkostnader inom logistikprocessen. Våra samarbetspartners i dettaarbetet är Electrolux, Gekås och Rusta

Concept Study and Design of a New Torque Calibration Rig

Lidgren, Albin January 2017 (has links)
When buying a new car today, the customer often expects to get a vehiclewith high quality. Each vehicle or engine should therefore be checked toassure quality. The same goes for clutches and couplings. A powerful enginebecomes useless when a clutch slips. Reliable torque measurement istherefore essential to the automotive industry. The herewith Bachelor thesisproposes a new torque calibration rig for online torque measurement in couplingapplications.The concept encompasses a servo motor with its associated electronics, agearbox to create the high torques (3 kNm), a reference torque transducer,and mounting elements or adapters. From the concept generation phase, thethesis includes CAD-models of the torque calibration rig with mathematicalmodels leading to the calculation of the measurement uncertainty of the calibrationsystem.This work was performed at BorgWarner PowerDrive Systems AB in Landskronaduring eight weeks; the two remaining weeks were completed in Lulea.

Modeling, Identification and Control of a Wall Climbing Robot Based on Vortex Actuation / Modellering, identifiering och styrning av en väggklättringsrobot baserat på Vortex aktuator

Papadimitriou, Andreas January 2018 (has links)
No description available.

Digitalisering av arbetsflöde för avvikelsehantering på inköpt material : En fallstudie utförd på Nolato Cerbo AB i Trollhättan / Digitalization of a workflow for deviation handling for purchased material : A case study performed at Nolato Cerbo AB in Trollhättan

Abbas, Tabassom, Sandblom, Sofia January 2020 (has links)
Ett examensarbete genomfördes på Nolato Cerbo AB i Trollhättan, med målet att utforma ett förslag på ett digitalt arbetsflöde för avvikelsehantering på inköpt material. De frågeställningar som arbetet skulle besvara var: • Kan ett arbetsflöde för avvikelser på inköpt material digitaliseras för att underlätta dokumentering, spårbarhet och hantering av information? • Hur ska arbetsflödet utformas för att uppnå de interna intressenternas krav och behov? • Vilka fördelar respektive nackdelar kan uppstå vid införandet av ett digitalt arbetsflöde? För att kartlägga hur flödet ser ut i nuläget samt problem med flödet, genomfördes intervjuer med de berörda avdelningarna. Intervjuerna tog också upp de anställdas åsikter om ett digitalt flöde. Ett flödesschema skapades och därefter identifierades slöseri i flödet. En benchmarking genomfördes också på Varner Retail Logistics AB, för att se hur ett annat företag arbetar med ett digitalt flöde för avvikelsehantering. Ett nytt flödesschema togs fram för avvikelsehantering på inköpt material, där de manuella delarna digitaliserades. Efter att ett test genomförts med berörd personal kunde det konstateras att det digitala flödet kommer underlätta dokumentering, spårbarhet och hantering av information. De interna intressenternas krav och behov uppfylldes också. Fördelar som respondenterna anser kan uppnås med det digitala flödet var tidsbesparing, ingen manuell pappershantering, snabbare spridning av informationoch att rätt information fylls i från början. Nackdelar som anses kan uppstå är att det kommer ta tid för personalen att lära sig och vänja sig vid det nya arbetssättet, samt begränsningar i mobilapplikationen. Slutsatserna som drogs var att det digitala flödet kommer att kunna användas om det utformas enligt författarnas förslag, men förändringar kan komma att ske i flödet i framtiden. Det kan också finnas personal på Nolato Cerbo AB som känner en osäkerhet inför digitalisering och förändringar. För att implementeringen ska bli lyckad kommer därför utbildning och information om digitaliseringens möjligheter krävas. / A case study was performed at Nolato Cerbo AB in Trollhättan, with the objective to design a suggestion of a digital workflow for deviation handlingfor purchased material. The following questions were issued to fulfil the objective of the case study: • Is a workflow for deviation handling for purchased material possible to digitalize in order to facilitate documentation, traceability and information handling? • How should the workflow be designed in order to reach the involved personnel's requirements and needs? • Which advantages and disadvantages could emerge from the implementation of a digital workflow? To be able to map the current workflow and its issues, interviews with the involved departments were conducted. The interviews also brought up the employees' opinions of a digital workflow. A flowchart was created and waste in the workflow was identified. A benchmarking was performed at Varner Retail Logistics AB, to get an insight of how another company uses a digital workflow for deviation handling. A new flowchart for deviation handling for purchased material was created, where the manual parts of the flow were digitalized. After a test had been performed with concerned employees, it could be stated that the digital workflow will facilitate documentation, traceability and information handling. The requirements and needs for the involved personnel were also fulfilled. Advantages that the respondents consider can be achieved with the digital workflow was time save, no manual handling of paper, a faster distribution of information and that the correct information will be filled in from the beginning. Disadvantages that the respondents consider can emerge is that it will take some time for the employees to learn and adapt to the new way of working and the limitations of the mobileapplication. The conclusions that were drawn was that the digital workflow will be able to be used if it's designed according to the suggestion, although changes to the workflow might be performed in the future. There might also be employees at Nolato CerboAB which afraid of digitalization and changes. For the implementation to be successful, an education and information about the possibilities that digitalization brings will be required.

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