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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.
71

Tillämpningav SIQ Managementmodell i SME : Tillämpningav SIQ Managementmodell i SME

Rydiander, Sandra, Lindholm, Filip January 2019 (has links)
Forskningen   utgår från framtidens utmaning att öka kunskaperna kring kvalitetsutveckling   och lyfta detta både som ledningsfråga och strategisk ägarfråga. Detta ur ett   SME-perspektiv som har begränsade resurser och kunskaper att ta sig an   kvalitetsutveckling. Studien   syftar till att öka förståelsen för hur kvalitetsutveckling, med hjälp av SIQ   Managementmodell, kan bidra till en hållbar resultatutveckling inom ett SME,   med erfarenhet av kvalitetsledningssystem genom ISO 9001. Studien är   baserad på en kvalitativ fallstudie av ett SME. Initialt skedde   litteraturundersökning och utformning av workshop med fokus på SIQ   Managementmodell i form av en presentation samt diskussionsunderlag för   fokusgrupp. Därefter genomfördes workshopen och datainsamling genom   individuella intervjuer samt gruppintervjuer och observationer. Studien   visar på en ökad förståelse för kvalitetsutveckling genom en påvisad medvetenhet   från medarbetarna. Med hjälp av SIQ Managementmodell kunde ett tidigare   deterministiskt synsätt på kvalitet göras medvetet för att ge utrymme för ett   mer dynamiskt synsätt. Deltagarna   blev medvetna om en möjlig hållbar resultatutveckling och ett fokus på   processutveckling, som kräver delaktighet för framgångsrikt arbete. Detta   beslutade deltagarna skulle bli nästa steg i utvecklingsarbetet. För   verksamheten som utgjorde fallstudien genererade workshopen en grund att utgå   ifrån att påbörja ett kvalitetsutvecklingsarbete. Det skapade även en   medvetenhet om förbättringsområden som både ledning och medarbetare kan   arbeta med. / This research is based on the future challenge of   increasing knowledge about quality development and highlights this both as a   management question and a strategic ownership issue. This from a SME   perspective that has limited resources and knowledge to take on quality   development. The study aims to increase understanding of how   quality development, with the help of SIQ Management model, can contribute to   a sustainable performance development within an SME, with experience of   quality management systems through ISO 9001. This study is based on a qualitative case study of   an SME. Initially, literature research and design of a workshop took place   focusing on SIQ Management model in the form of a presentation and discussion   for a focus group. Subsequently, data collection was carried out the workshop   through both individual and group interviews and observations. The results of the study show an increased   understanding of quality development through a proven awareness of the   employees. With the help of SIQ Management model, a previous deterministic   approach to quality could be made consciously to allow for a more dynamic   approach. The participants became aware of a possible sustainable performance   development and a focus on process development, which requires participation   for successful work. The participants decided that this would be the next   step in the development work. For the firm that constituted the case study, the   workshop generated a foundation on which to start a quality development work.   It also created an awareness of areas for improvement that both management   and employees can work further with. / <p>2019-06-26</p>
72

Development of a maintenance plan for the STEPWISE project at Swerea MEFOS

Hassabelnaby, Aly January 2018 (has links)
Process plants come with a wide variety of engineering challenges. Each process has uniqueoperating conditions that require careful operation and maintenance programs to keep the process equipment in a condition that is safe for operation. A pilot-scale plant was built in Luleå to demonstrate the possibility of carbon dioxide removal from blast furnace gas usingthe Sorption Enhanced Water Gas Shift (SEWGS) technology. One of the challenges facingthe SEWGS pilot plant was the lack of a maintenance plan which was the motivation for this thesis. The aim of this thesis was to create a maintenance plan for the SEWGS pilot plant. Studying the process conditions of the pilot plant was the starting point since an understanding of the unique operating conditions was necessary for creating a maintenance plan for the pilot plant’s equipment. The Reliability-centered maintenance (RCM) method was chosen to create the maintenance plan. The study began with determining the objectives and contents of the analysis. The next step was a functional failure analysis in the form of a Failure Mode and Effect Criticality Analysis (FMECA) covering all the equipment in the plant. Afterwards the failure consequences were assessed based on a criticality assessment matrix to determine which equipment necessitate the performance of maintenance activities. The maintenance plan was created based upon the criticality of the equipment and the selected maintenance activities were based on the recommendations of manufacturers. The failure analysis found that the blast furnace gas compressor is the most critical for the process. The boiler and superheater have been found to be highly critical due to the dangerous safety consequences of their failure. In addition, all pressure safety valves have been found to be highly critical due to the hidden nature of their failure. The maintenance plan addresses these critical items and other less critical items while some non-critical items have been removed from the plan due to the negligible consequences of their failure.
73

Evaluation and optimization of PolyCor - a single-use Coriolis flowmeter / Evaluering och optimering av PolyCor- en Coriolisflödesmätare för engångsbruk

Ekström, Evelina January 2018 (has links)
In the pharmaceutical industry it has become common to use single-use components in the production line to save time and money. Therefore, a team at General Electric started to develop a single-use Coriolis flowmeter, PolyCor M13, targeted at liquid chromatography systems. A Coriolis flowmeter in this embodiment is simply a tube put into vibration at its natural frequency. When there is a flow through the vibrating tube the Coriolis force arises, causing a phase shift of the pickup signals on each side of the actuator. This phase shift is linearly proportional to the mass flow through the tube.  The approach of PolyCor M13 is a separate oscillator and flow path. The oscillator is a metal skeleton holding the flow path, a silicone tube. The initial requirement flow range was 0.16-7.8 kg/min with an error less than 2%. Initial tests indicated that the prototype fulfilled these requirements at ambient temperature. This thesis is a further evaluation of the performance of M13. The main goal was to establish the pressure and temperature dependence and find an model to compensate for these. Investigation if M13 can manage flows up to 10 kg/min was also a part of this scope.  Control measurements showed that flows less than 2 kg/min could give large errors, over 5%. Flows higher than 2 kg/min up to 10 kg/min had errors less than 5%. The error was determined using a reference mass flow. By increasing the pressure in the system, from 0 to 4 bar, the error increased substantially. For the two lowest flows tested, 0.5 and 1 kg/min, the computed mass flows gave errors over 100%. The error for 2 kg/min was around 70% and the error successively decreased for higher flows and at 6-10 kg/min the error was around 20%. A compensation model was established by fitting a polynomial to the data. The best compensation model managed to reduce the error on new test data to 5-10% for flows between 2-10 kg/min. For smaller flows the error was still high but less than 100%.  Significant deviation from the temperature at which the proportionality was determined caused large errors. Errors for low flows, 0.5 and 1 kg/min, gave errors mainly up to around 50% but some errors were over 100%. For higher flows, 2-10 kg/min the error is up to 30% with some occasional errors up to 60%. The procedure to establish a compensation model for temperature was similar to that for the pressure compensation model. The best model for temperature compensation managed to reduce the error to 5-10% for flows between 2-10 kg/min. For lower flows the error was still high but slightly better, some error was still over 100%.  In conclusion, M13 is not as reliable as initial tests showed. The error limit is exceeded, especially for flows less than 2 kg/min. A more suitable range would be 2-10 kg/min. The pressure and temperature effects have an enormous impact but can be compensated to some extent. Since the accuracy of M13 is not perfect, errors less than 5% can be difficult to obtain in the current state of M13.
74

Examensarbete komfortlab : Undersökning av värmelaster med två-nivåers faktorförsök / Bachelor thesis - Study of heating loads with two-level factor design

Nilsson, Therese, Andersson, Therése January 2018 (has links)
The goal of this study was to investigate future controls of heating loads in a comfort laboratory. The laboratory room is used to simulate how the room comfort will change by using one or more cooling beams. External walls can be used to test different room sizes, and heat effects can be provided from the floor and one wall. The study was conducted according to a two-level factor design and the five factors used were floor heating, north wall, west wall, fan and facade wall. In a full two-level factor test plan, there are 32 tests for five factors that needed to be done. Instead of making 32 tests, the study continued with a fractional two-level factor design, which meant that only 16 tests were performed. The response variable for the tests was the so called "losses" which may be positive or negative and is a percentage of the floor effect. Via "losses" the average temperature of the measuring room could be 24.5 ˚C, which was the temperature chosen for this survey. Before the results for each test were taken, requirements for "steady state condition" were met. The requirements are taken from an ISO standard that the company uses, and it provides reliability of the results. The analyzes when having "losses" as a response variable also pointed out the floor as the most influential factor. However, there were different results regarding the scheme on the other factors. It is due to different coding of the factors, and "losses" was used in the units % or watts. Some disturbances were detected in the results. One is that "losses" has a connection to the floor heating, which may be the reason it is most significant. The two levels of the floor heating did not match because "losses" changed the levels. For the next two-level factor design experiment, it is recommended that the effect of the floor is constant because of its connection to "losses". The response variable can therefore be "losses". The constant on the floor heating can be changed when the factor plan is repeated several times to see how "losses" varies with different floor effects.
75

”Lönsamt ledarskap” : Sambandet mellan ledarskap, TQM, effektivitet och lönsamhet

Prekopic, Suzanna January 2018 (has links)
Idag står organisationer inför ständiga utmaningar att förändra och effektivisera sin verksamhet, vilket kan förklaras med det ökade kravet på ökad lönsamhet och kostnadsnedskärningar. Detta har bidragit till att företagsledningar oftast löser dessa ökade krav genom kostnadsrationaliseringar. Dock har det visat sig vara mindre framgångsrikt. Ambitionen med examensarbetet har varit att undersöka hur ledarskap kan utövas för att uppnå TQM, effektivitet och lönsamhet. Ett svenskt byggföretag har varit föremål för denna fallstudie. Fallstudien har genomförts genom strukturerade djupintervjuer med tre gruppchefer samt enkätfrågor till medarbetare. Det huvudsakliga resultatet från den här uppsatsen är begreppet lönsamt ledarskap, vilket är genererat ur det analyserade materialet. Studiens resultat visar att det är flera faktorer som bidrar till det lönsamma ledarskapet. Resultatet visar att hörnstenarna i hörnstensmodellen är en stor bidragande faktor till det lönsamma ledarskapet. Emellertid har studiens resultat kommit fram till att den sjätte hörnstenen “engagerat ledarskap” är mycket viktig för organisationens framgångssaga vad gäller lönsamhet, kortsiktigt som långsiktigt. / <p>2018-08-29</p>
76

Möten som motor i kvalitetsutveckling : En fallstudie av ett systemutvecklingsteam som arbetar Agile

Falkeström, Karin January 2017 (has links)
Syftet med det här arbetet var att bidra till utvecklingen av kvalitetsutvecklingsområdet genom att beskriva hur en Agile verksamhet använder arbetsmötet som ett strategiskt verktyg i sitt kvalitetsutvecklingsarbete. Detta genom att studera dels hur teamet använder Agile för att driva kvalitetsutvecklingsarbetet och hur arbetsmötena är strukturerade, dels teammedlemmarnas upplevelse av arbetsmötenas kvalitet och mötesledarens funktion. Arbetet genomfördes som en fallstudie där studieobjektet var ett systemutvecklingsteam på ett internationellt företag. De undersökningsmetoder som användes var intervjustudie, observationsstudie och enkätstudie. Arbetet genomfördes inom ramen för Mittuniversitetets magisterprogram i kvalitets och ledarskapsutveckling. Resultatet visade att det studerade teamet har hittat formerna för att använda arbetsmötet som motor för kvalitetsutvecklingsarbetet. Detta genom att anamma de principer som förbättringsprogrammet Agile bygger på. Principer som utgår från ett stort fokus på att hitta former för en fungerande interaktion mellan individer liksom på arbetssätt som gör det möjligt att snabbt ställa om till nya förutsättningar. Teamet arbetade enligt en väl genomarbetad och förankrad mötesstruktur som gjorde att deltagarna kunde fokusera på vad de skulle bidra med under mötet. Ledaren av arbetsmötet visade sig fylla två viktiga funktioner: dels den uppgiftsrelaterade som handlade om att leda arbetsmötet mot de uppgifter som skulle hanteras, dels den gruppunderhållande som innebar att underlätta interaktionen i teamet. Trots att teammedlemmar ägnade stor del av sin arbetstid i arbetsmöten upplevde de en hög grad av nöjdhet med kvaliteten i arbetsmötena. / The purpose of this work was to contribute to the development of Total Quality Management, TQM, by describing how an Agile organization uses the workplace meeting as a strategic tool in its quality development work. The work focused on how the team use Agile to drive its quality development work, the structure around work meetings, the function of the leadership during the work meetings and the team member’s experiences when it comes to the quality of the work meetings. The work was conducted as a case study where the subject was a system development team at an international company. The survey methods used were interview study, observation study and questionnaire study. The work was carried out within the framework of Mid Sweden University's Master's Program in Quality and Leadership Development. The result showed that the studied team has found ways to use the workplace meeting as a motor for TQM. This by adopting the principles based on the Agile improvement program. Principles that focus on finding forms for a functional interaction with individuals as well as working methods that enable quick adoption to new conditions. The team worked according to a well- and firmly established meeting structure that allowed participants to focus on what to contribute with during the meeting. The leader of the meeting proved to fill two important functions: the task-related which was to lead the working meeting to the tasks that were to be handled, and the group-maintenance which was to facilitate the team interaction. Even though the team members spent much of their working hours in work meetings, they experienced a high level of satisfaction with the quality of the work meetings. / <p>2017-06-28</p>
77

Crowdsourcing för en starkare krisberedskap i Sverige : Ett avstamp mot framtiden

Fransson, Christoffer January 2017 (has links)
Syftet med uppsatsen är att bidra med kunskapsutveckling kring hur ”crowdsourcing” idag används och upplevs som ett stöd för att säkra och utveckla kvalitet inom svensk krisberedskap. Detta uppnås genom tillämpning av en explorativ, pragmatisk och abduktiv ansats av mixad metod. Insamlad empiri utgörs av en enkät med respondenter från 119 kommuner samt fyra kvalitativa intervjuer. Resultatet visar att crowdsourcing inom ramen för svensk krisberedskap inte är ett känt begrepp bland de responderande kommunerna men att intervjupersonerna känner till begreppet i relation till krisberedskap. Idag tillämpar Malmö Stad och Krisinformation.se crowdsourcing inom ramen för deras krisberedskapsrelaterade verksamhet, pilotförsök med crowdsourcing-liknande metoder pågår hos SOS Alarm. Västerås Stad diskuterar området inför eventuell framtida utveckling. Den verksamhet som idag bedrivs inom krisberedskapsrelaterad crowdsourcing inom Sverige är begränsad till endast ett fåtal aktörer som bedriver verksamhet eller pilotförsök. Crowdsourcing som generellt begrepp är ännu inte välbekant bland många svenska kommuner och än mindre ur ett krisberedskapsperspektiv. Vidare finns det kvalitetsmässiga farhågor över till exempel inmatning av felaktiga data som genererar följdkonsekvenser. Det teoretiska ramverket presenterar flera olika forskningsområden som kan tillämpas för att lösa dessa farhågor. Det uppsatsen tillför forskningen är ett sammanställt utgångsläge utifrån existerande forskning och praktisk erfarenhet med goda möjligheter för framtida forskning (eller tillämpning) inom ett för Sverige synnerligen ungt och outforskat forskningsområde. / The purpose of this thesis is to add to the development of a knowledgebase concerning how crowdsourcing is used and experienced as a support to secure and develop quality within Swedish societal crisis management. This is accomplished by applying an explorative, pragmatic and abductive approach of mixed theory. Collected data consists of one survey with 119 respondents (municipalities) along with four qualitative interviews. The result show that crowdsourcing within Swedish societal crisis management is not known by the survey respondents but known within that context by the participants of the interviews. Malmö City and krisinformation.se applies crowdsourcing methods as a part of their crisis preparedness operation today, trials with crowdsourcing-like methods is conducted by SOS Alarm and last Västerås City are discussing this area for potential future development. Crisis related crowdsourcing operations within Sweden today are reduced to a few actors conducting either regular operations or trials. Crowdsourcing as a general term is not yet well known among many Swedish municipalities and even less known with a crisis preparedness perspective. Additionally, there are quality related concerns such as input of erroneous data leading to further consequence. The theoretical framework presents several research areas that can be applied in solution to such quality concerns. This thesis addition to research is a compiled platform based of existing research and practical experiences with plenty of room for future research or practical application within a for Sweden particularly young and unexplored field of study. / <p>2017-06-28</p>
78

Mätsystemanalys för förbättring av mätnoggrannheten med mätsticka, mikrometer och skjutmått på SKF i Hofors

Valler, Agnes, Ågren, Isabelle January 2017 (has links)
SKF Coupling in Hofors manufactures screws and couplings to the energy sector and the marine industry. The products have tight tolerances to be more attractive at the market through the tolerances. With increased competition on the market, the quality requirements increase, which means that many products fail to meet the quality requirements in order to avoid customer complaints. The purpose of this work was to improve measurement accuracy. To get an overview of the current situation, interviews and observations were made. A measurement system analysis was conducted by tests where a certain number of products were measured by a certain number of operators, with a certain number of repetitions. The test results were analyzed by a two-way ANOVA and Gauge R&amp;R, which are common methods in measurement system analysis. A cause-and-effect diagram was used to investigate the causes of quality problems. The results indicated that the existing measurement systems were not reliable enough. The shortcomings may depend on the measuring device and the operator. The measuring device may be defective or have calibration defects. Operators can have different methods when measuring which contributes to variations in the measurements. The work led to suggestions for improvements that could imply higher accuracy in the measurement systems. For example, a tighter calibration interval of the measuring device would lead to reduced impact from the measuring device. A standardized education of measurement method, measurement environment and the importance of deviation management can also lead to improved measurement accuracy. / SKF Coupling i Hofors tillverkar skruvar och kopplingar till energisektorn och den marina industrin. Produkterna har snäva toleranser för att genom toleranserna vara mer attraktiva på marknaden. I och med ökad konkurrens ökar kvalitetskraven. Därför kasseras många produkter, som inte uppnår kvalitetskraven, för att undvika returer från kunderna. Syftet med arbetet var att förbättra mätnoggrannheten. För att få en överblick av nuläget gjordes intervjuer och observationer. En mätsystemanalys gjordes genom tester där ett utvalt antal produkter mättes av ett utvalt antal operatörer, med ett visst antal upprepningar. Testresultaten analyserades med en tvåvägs-ANOVA och Gauge R&amp;R som är vanliga metoder inom mätsystemanalys. Ett orsak-verkan-diagram användes för att undersöka orsakerna till kvalitetsproblemen. Resultatet visade att det finns brister i det nuvarande mätsystemet. Bristerna kan bland annat bero på mätdonet och operatören. Mätdonet kan exempelvis vara defekt eller ha brister i kalibreringen. Operatörerna kan ha olika metoder som bidrar till variationer i mätningarna. Arbetet ledde till förbättringsförslag, som kan innebära högre noggrannhet i mätsystemen. Exempelvis skulle ett tätare kalibreringsintervall hos mätdonen leda till minskad påverkan från mätdonen. En standardiserad utbildning av mätmetod, mätmiljö och vikten av att avvikelsehanteringen följs kan också leda till en förbättrad mätnoggrannhet.
79

Condition Based Maintenance in the Manufacturing Industry : From Strategy to Implementation

Rastegari, Ali January 2017 (has links)
The growth of global competition has led to remarkable changes in the way manufacturing companies operate. These changes have affected maintenance and made its role even more crucial for business success. To remain competitive, manufacturing companies must continuously increase the effectiveness and efficiency of their production processes. Furthermore, the introduction of lean manufacturing has increased concerns regarding equipment availability and, therefore, the demand for effective maintenance. That maintenance is becoming more important for the manufacturing industry is evident in current discussions on national industrialization agendas. Digitalization, the industrial internet of things (IoT) and their connections to sustainable production are identified as key enablers for increasing the number of jobs in industry. Agendas such as “Industry 4.0” in Germany and “Smart Industry” in Sweden are promoting the connection of physical items such as sensors, devices and enterprise assets, both to each other and to the internet. Machines, systems, manufactured parts and humans will be closely interlinked to collaborative actions. Every physical object will formulate a cyber-physical system (CPS), and it will constantly be linked to its digital fingerprint and to intensive connection with the surrounding CPSs of its on-going processes. That said, despite the increasing demand for reliable production equipment, few manufacturing companies pursue the development of strategic maintenance. Moreover, traditional maintenance strategies, such as corrective maintenance, are no longer sufficient to satisfy industrial needs, such as reducing failures and degradations of manufacturing systems to the greatest possible extent. The concept of maintenance has evolved over the last few decades from a corrective approach (maintenance actions after a failure) to a preventive approach (maintenance actions to prevent the failure). Strategies and concepts such as condition based maintenance (CBM) have thus evolved to support this ideal outcome. CBM is a set of maintenance actions based on the real-time or near real-time assessment of equipment conditions, which is obtained from embedded sensors and/or external tests and measurements, taken by portable equipment and/or subjective condition monitoring. CBM is increasingly recognized as the most efficient strategy for performing maintenance in a wide variety of industries. However, the practical implementation of advanced maintenance technologies, such as CBM, is relatively limited in the manufacturing industry. Based on the discussion above, the objective of this research is to provide frameworks and guidelines to support the development and implementation of condition based maintenance in manufacturing companies.  This thesis will begin with an overall analysis of maintenance management to identify factors needed to strategically manage production maintenance. It will continue with a focus on CBM to illustrate how CBM could be valued in manufacturing companies and what the influencing factors to implement CBM are. The data were collected through case studies, mainly at one major automotive manufacturing site in Sweden. The bulk of the data was collected during a pilot CBM implementation project. Following the findings from these efforts, a formulated maintenance strategy is developed and presented, and factors to evaluate CBM cost effectiveness are assessed. These factors indicate the benefits of CBM, mostly with regard to reducing the probability of experiencing maximal damage to production equipment and reducing production losses, particularly at high production volumes. Furthermore, a process of CBM implementation is presented. Some of the main elements in the process are the selection of the components to be monitored, the techniques and technologies for condition monitoring and their installation and, finally, the analysis of the results of condition monitoring. Furthermore, CBM of machine tools is presented and discussed in this thesis, focusing on the use of vibration monitoring technique to monitor the condition of machine tool spindle units. / INNOFACTURE - innovative manufacturing development
80

Funktionskrav på beläggningar i plankorsning / Functional requirements for plates in level crossings

Farhan, Ahlam Hussein, Šender, Goran January 2021 (has links)
Syfte och mål – Syftet med arbetet är att bistå Trafikverket i skapandet av ett nytt TDOK för godkännande av beläggningar i plankorsningar, samt att i förlängningen underlätta för återförsäljare att få sina produkter prövade mot krav i ett nytt TDOK som avgör om de kan tas i bruk. Målet för arbetet är att genom kartläggning skapa ett underlag innehållandes en matris som inbegriper funktionskrav med tillhörande specifika egenskaper. Metod – Arbetet består av en kvalitativ fallstudie som ingriper en dokumentanalys av utvalda statliga styrdokument samt fältstudie. Fältstudien utgörs av data i form av observationer vilka inkluderar fotografier, fältanteckningar och informella intervjuer. Resultat – I arbetet föreslås matris över funktionsparametrar och egenskaper. Avgränsningar/implikationer – Studien förhåller sig till sakförhållandena i Sverige Originalitet och värde – Arbetet ger djupare inblick i problematiken som uppstår genom åldrandet av dokument som innehåller kravspecifikationer. Nyckelord – futktionsparametrar, beläggningar i plankorsningar, funktionsregelverk, kravspecifikationer, styrdokument

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