Dissertations / Theses on the topic 'DFM och DFA'
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Haddad, Robert, and Aram Azizi. "Konceptutveckling av kabelmaskin för träning med resistans och viktsimulering." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-55182.
Full textThere are far too many gym machines and equipment’s these days. The majority of the new gym members find it hard to train regularly, especially if they train alone. New members also tend to skip the gym more frequently than that of the experienced and established members. The number of machines and equipment’s used for training purposes increases every year because of the fitness industry increasing in popularity. Professional athletes demand more advanced products because of the increase in competition. Resistance training is the most popular training method because more people look to building muscles rather than functional training. The benefits of resistance training includereduced injuries, builds, and strengthens the muscles. The purpose of this theses is to design a functional and aesthetically pleasing gym product. Today’s generation is more invested in fitness than the past generations. The more technology advances, the lazier humans have become. When the COVID pandemic hit in 2019, the amount of home gym owners reached an all-time high. The product that Company A wants to manufacture is targeted for professional athletes, commercial gyms and for private use. This thesis primary focus is to develop a product with the purpose of facilitate training for the fitness industry, increase availability and build a better understanding for training. This project had a confidential agreement that every participant signed before start. Together with the confidential agreement, the product requirements were written and accepted by all participants. The product requirements include the functional capabilities of the finished product. The following research questions were used to determine the success of the project: Q1: Is the finished product design esthetically pleasing for Company A? Q2: How can the functional requirements combine with an esthetic design in an effective manner? Q3: How can the product requirements apply for the concept and its part subsystem? Q4: How can the concepts combine in the most effective manner theoretically? This project used most of the help from the supervisor(s) and the “Produktutveckling” literature. The project underwent a few phases as explained in the literature, to generate and select the most useful concept. The chosen concepts were then further developed for a resulting design concept. The developed concept was then chosen as the finished design, by an agreement of the participants. The finished product design resulted in a combination of the different concepts generated in the earlier phases. The reason behind the combination was to include the pros and exclude the cons of each design concept. The project was a success, since Company A approved the design and considered the finished concept as aesthetically pleasing. All of the product requirements that was set were unchanged and included in the finished product. The remaining product requirements that were left unanswered could only be determined by manufacturing and further testing, which is beyond the students signed agreements.
Kabroo, Carl Gustaf, and Robert Willenius. "Produktionsoptimering av elektromagnetiska omrörare - "ORD 43P" och "EM Stabilizer"." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-19517.
Full textThe thesis in product development – design was carried out between February and June 2013 and includes 15 credits (C-level), and is the final course of the Bachelor Program in Engineering, Innovation and Product Design. The thesis dealt with the problem of adaptation to production and cost optimization of two pieces of electromagnetic stirrers at the company ABB, Process Automation, Metallurgy in Västerås. After contact with the supervisor from ABB, Jan-Erik Eriksson, the project work commenced to adapt the manufacturing design of the product ORD 43P and EM Stabilizer. To achieve cost-optimized production and production adapted design, the authors applied the following product development tools: Design for Cost, Design for Manufacture and Design for Assembly. To verify that the design was optimal, but also that it did not break during stress, the authors used the computer based module finite element method of the CAD program SolidWorks. The selection of components was based on the component’s price per kilo. To select the optimum material, that is high strength and affordable, the authors used the material database software CES EduPack. The materials selected from CES EduPack could not be found by the authors as standard material at the market. Therefore, the authors changed strategy to compare and select materials based on market research of standard materials with suppliers. The components of ORD 43P were optimized in terms of design in comparison with existing components coil bracket and insulation boards. They were also cost reduced significantly. The component frame base was examined briefly. Through product development the components coil bracket, insulating boards and frame base the total cost of ORD 43P was reduced by 2,47 %. The authors found that the total cost of ORD 43P could be reduced between 10-25 % as many of its components are oversized and made of more expensive materials than needed. The components of EM Stabilizer, cover and pneumatic hose, were designed with optimum design and was cost reduced.Through product development the components cover and pneumatic hose the costs of EM stabilizer were reduced by 1,3 %. The authors assume that the costs of the EM Stabilizer can be reduced, because it is relatively new at the market. ABB want to ensure that the product reach its guaranteed life by over-sizing many of the components of the product and use more expensive material than necessary.
Kostnadssänkningsprojekt
Wikdahl, Alexander, and Andreas Eriksson. "Produktutvecklingav friktionssvetshuvuden genom K-FMEA och DFA2." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-64737.
Full textWith increased competition and increased customer requirements, companies need to pursue product development with a rapid approach. ESAB’s way of responding to these demands has resulted in a wide product range of friction welding heads. Their long-term goal is therefore to set a new standard to reduce costs. The plan is to actively conduct product development together with universities in Sweden. This product development project can be described as a first step in sustainable product development work at ESAB towards a long-term goal of setting a new standard within FSW. The purpose of this thesis is to analyze two friction welding heads: FSW LEGIO 4UT and FSW LEGIO 5UT through K-FMEA and DFA2. Thereby, identify the potential shortcomings found in the existing constructions and highlight where the shortcomings exist. The analysis results, together with product development theory, will form an information base for the pursuit of continued product development. The approach has been conducted through three phases: 1) start-up/pre-work, 2) implementation, and 3) completion/presentation. The science view has been characterized by a positivistic nature with elements of hermeneutic in some respects. The research method has been qualitative in terms of data collection, analysis methodology and evaluation methodology. The research effort has been abductive, while the research focus has been a combination of exploratory and descriptive. First, drawing documents, component lists, STEP files and product specifications were analyzed for a total of eight friction welding heads. A strategic selection of three was made to further exclude one more. An in-depth dive into the empirical evidence was made which gave rise to two hypotheses: 1) Components that move relative to others in welding operation, are most likely to be subject to errors; 2) These friction welding heads may possibly be compressed in terms of volume, and the components reduced to the number. A semi-structured focus group interview was conducted with a total of four respondents who have technical expertise in the field. The result of the interview allowed the hypothesis to be confirmed. The empirical data was put against the existing theory regarding K-FMEA and DFA2. Furthermore, K-FMEA was performed according to the theory in seven stages at both system level and component level. Then the same was done for DFA2, whose mode of operation takes place in four stages. The result of this thesis shows that the most critical components relate to the spider, spider house and the bearings. There are also stains in hydraulics that have been awarded high risk priority numbers. Along with that, failure modes with high risk frequencies related to manufacturing and assembly are identified. When it comes to DFA2, the result shows that the existing designs has low degree of assembly ease. This is because several mounting directions are used, several components are large, heavy and difficult to handle. Some components also have difficult access point. In addition, external equipment such as fixtures and tools, are needed to install some components. The recommendation to ESAB in a potential second step of their product development work, would be to complement this study with other product development tools and cost calculations. This to make sure to do right from the start and eliminate risks for any subsequent costly adjustments.
Svensson, Daniel, and Ramic Edin. "Reducering av monterings- och installationstid genom implementering av DFA." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-76165.
Full textDubinovic, Nermin, and Denny Nelson. "HUR CIRKULÄR EKONOMI KAN IMPLEMENTERAS I SMÅ OCH MEDELSTORA FÖRETAGS PRODUKTUTVECKLING." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-11017.
Full textToday’s trend of production and consumption has a linear type. Material is extracted, become products and then end up as landfill. This thesis has together with Industrial Development Center AB aimed to create a more sustainable industrial production within the region of Skaraborg, by forming a product development process according to circular economy. Circular economy advocates that there should be no waste and products and material should circulate throughout different cycles. Hence this thesis consist of a broad pre-study to collect and evaluate a big range of theories, processes and enterprise responsibilities. Later on a general product lifecycle was studied and a map of a process was made with circular economy and product development processes in mind. The work was tied together by a performance specification table. This document was also used as a basis for the evaluation of the final product development process with circular economy implemented. Finally, the result was also evaluated by an experienced user to get an initial assessment of the result’s usability for the target groups. The result was an environmentally adapted product development process and a folder explaining how and why circular economy is to support enterprises and the community.
von, Yxkull Filippa. "Implementing Design For Automatic Assembly : A recommendation on how to implement andapply DFAA at Company Y." Thesis, KTH, Industriell produktion, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232710.
Full textBehovet av att arbeta med Design for Automatic Assembly (DFAA) har uppmärksammat ilitteraturen. Däremot har implementeringen av DFAA inte blivit tydligt definierat. Syftet meddetta examensarbete blir således att undersöka och bidra med kunskap om hur DFAA skaimplementeras i en organisation, så som Företag Y.Flera intervjuer har genomförts för att upprätta en nuvarandeanalys för att få förståelse för derådande problemen hos Company Y och hur dessa ska hanteras. En benchmarkingstudiegenomfördes, där de tre företagen Ericsson, Company X och Scania intervjuades. Alla treföretagen har framgångsrikt implementerat DFA och har intervjuats med syftet att erhålla derasbästa praxis. Studien innefattar även en tidig implementering av DFAA, där enmjukvarubaserad DFA2-metod skapad av Eskilander (2001), har testats på en aktuell produktoch ett nytt utvecklat koncept på Company Y. Baserat på detta kunde ett rekommenderatarbetsflöde av utvärderingen presenteras.Baserat på empiriska studien kunde flera rekommendationer gällande hur DFAA skaimplementeras i en organisation skapas. Studien belyser att DFAA bör tillämpas så tidigt sommöjligt i produktutvecklingsprocessen. DFA2-metoden bör utnyttjas på produktnivå för attunderlätta konceptvalet och på komponentnivå för att göra produkterna/modulerna lämpade förautomatisk montering, detta innan designen är "låst" och innan en fysisk prototyp harkonstruerats. Avdelningar som ska arbeta med DFAA inkluderar produktion, designkvalitet ochinköp. När DFA blir rotad i företaget kommer dock fler funktioner i företagets supply chain attpåverkas. Det innebär att fler funktioner kan behöva inkluderas med arbetet kring DFAA.Slutligen så inkluderar studien en beslutsmodell relaterat till DFAA. Besluten baseras på demätbara värden från DFA2-metoden.
Möller, Johanna, and Victoria Nilsson. "Rätten till sjukpenning : Om sjukdomsbegreppet i sjukförsäkringen och de tolkningsproblem som kan uppkomma vid psykisk ohälsa." Thesis, Karlstads universitet, Fakulteten för humaniora och samhällsvetenskap (from 2013), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-46879.
Full textBåtnäs, Michaela. "Verktyg för konceptval av sammanfogningsmetoder från ett DFA-perspektiv : Produktutvecklingsprojekt av ett verktyg för en effektivare montering och tillverkning." Thesis, Karlstads universitet, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-78903.
Full textThe following report includes the product development that was carried out in the bachelor thesis for the innovation and design engineering program at Karlstad University. The assignment was delivered by Vestre Production AB, and they have requested a tool for evaluation of joining methods. The aim has been to create a tool used for the weighting of different product properties based on engineering knowledge. Today, there are several methods for conducting an evaluation of Design for Assembly, where the biggest shortcoming among them is the lack of proposals for restructuring and assigning information at the right time. An advantageous method is to use evaluation criteria that provide direct feedback with solutions to design problems. The product development process has been used to systematically develop a product that supports the developer at an early stage of the design process. Furthermore, methods for DFA have been studied and criteria linked to product characteristics have been applied with regard to the client's production. The work resulted in a preliminary proposal of a user-friendly DFA-tool created in Microsoft Excel and specifically designed for the client to be used to compare different design solutions of a product. In the tool the user finds, instructions, concept comparison and individual concept evaluations. The structure of the tool has been created through programming that contributes to an objective approach to product evaluation.
Panta, Uday. "Charge Separation in Nano-diamonds: DFT Study." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1594381914885325.
Full textJensen, Jonas, and Sara Nilsson. "DFM/A-metod för integrerade strukturdelar i kolfiberkomposit : Vidareutveckling av metodik för SAAB Aerostructures." Thesis, Linköpings universitet, Industriell Produktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122012.
Full textCarbon fiber reinforced plastic (CFRP) is one of the fastest developing materials right now. Analogously to the material becoming cheaper and being used more widely in the aerospace industry the manufacturing methods have developed to follow the progress. How material and manufacturing method change the requirements and affect a product's design and performance can be hard to determine. This degree project has developed a Design for Manufacturing and Assembly (DFM/A) method to easier take into consideration the production process throughout the product development. The DFM/A method is developed for Saab Aerostructures and is based on their materials, production process and product development process. By studying literature and performing case studies a DFM/A method called Method 2015 (M2015) was developed. The method includes a work procedure, design guidelines and supporting DFM/A tools. By considering the production aspects throughout the development process this method of operation facilitate the development of CFRP products at Saab. In addition to the method itself the materials needed to use M2015 is compiled in a manual for the designer. By creating a better understanding of the production aspects of a design and providing the right tools the DFM/A method can contribute to several positive effects. The use of M2015 should lead to CFRP products that are easier to produce which in turn should minimize unnecessary costs, raise the quality and shorten lead times. However, the implementation of M2015 at Saab also creates demands to reach these targets
Awala, Ibrahim. "Influence of strain and point defects on the Seebeck coefficient of thermoelectric CoSb3 : Inverkan av töjnings och punktdefekter på Seebeck-koefficienten för termoelektrisk CoSb3." Thesis, Malmö universitet, Fakulteten för teknik och samhälle (TS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-42567.
Full textCapella, Salmazo Debora Heloisa. "Theoretical investigation of the hydrogen electrocatalysis in alkaline media on bimetallic Ni-based electrodes." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAF067/document.
Full textThe mechanism of hydrogen oxidation reaction (HOR) in Ni(111) is well-known and it happens through Volmer-Heyrovsky steps, in alkaline media. However it was proposed that water formation could play an important role. In this thesis, I have studied nickel and bimetallic nickel surfaces using density functional theory (DFT). I calculated thermodynamical magnitudes (like Gibbs energies of adsorption) and kinetic properties (like activation barriers for water formation). Several Ni/Cu surfaces were analyzed. The one with 25% of Cu (on top layer) has the best performance because: 1) the activation energy is 0.2 eV, and 2) OH and H are not to strongly adsorbed on the HOR potential range
Karlsson, David. "Produktanpassning vid insourcing av bearbetning : Tillverkningsanpassad konstruktion och insourcing i produktutvecklingsprocessen." Thesis, Mälardalens högskola, Innovation och produktrealisering, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-36054.
Full textHigh product quality together with low manufacturing cost are vital aspects of the economic success of a product. To achieve such success the method Design for Manufacturing (DFM) is used. DFM is a highly integrative method and demands a cross-functional team consisting of experts such as production engineers, pre-process engineers and manufacturing personnel (Ulrich & Eppinger, 2014). Volvo CE has a continuous work with DFM and it is done through many iterations and direct contact between the manufacturing- and design department. Although the overall work with DFM is continuous the department Driveline Systems Product Improvement is requesting a method for this work, due to the lack of any methods used today. It is discovered that there are many different methods for DFM described by many authors, and in this thesis methods by Ulrich & Eppinger (2014), Dalton et al. (2016) and O’Driscoll (2002) are investigated. A standardized way may increase the quality of the DFM work and may help create a more holistic view. A holistic view over the work with DFM can help create better conditions for re-use of previous knowledge related to manufacturing of the parts. In addition of the requested method for DFM the current product development process used, DMAIC, is investigated. The process is today mainly used and adapted for the development and improvement of existing products. The reason of the current case studies is to increase the utilization level at the current manufacturing department, and thus no improvement or development is initially present. Therefore, the current insourcing case studies are compared to the Volvo process DMAIC. To connect the current case to established product development processes the case studies are also compared to a theoretical product development process. Methods used within this thesis are field work, with interviews and case studies, and a complementary literature study to investigate methods and to increase the understanding of DFM and insourcing. In the field work two parts for insourcing are investigated as two case studies. The parts are initially selected through a project selection, where a total of six parts are included. To perform the selection and further development of the current case studies Ullmans (2010) design process were applied, with use of relevant methods and tools for this work. Also, some elements of the product development process according to Ulrich & Eppinger (2014) were applied. Based on the requested method for DFM and the current case studies the following research questions were raised: How does an insourcing process correlate with theoretical design processes and with Volvo’s product development process? Where in the insourcing process is it relevant to include DFM? Aspects of DFM are aspects that affect the manufacturing cost. When insourcing processing of parts and labour shift rate are the most relevant and important aspects and should be addressed when selecting and evaluating project. Both processing of parts and labour shift rate are aspects that affect the manufacturing cost. When insourcing it is also important to include aspects connected to outsourcing, and this fact cannot be identified in the DMAIC process nor the design process of Ullman (2010). Compared to the current insourcing case studies there are some differences between both the design process of Ullman (2010) and the Volvo process DMAIC, even if there also are some similarities.
Fäldt, Robert, and Jennie Åkesson. "Vidareutveckling av serveringskanna i plast avsedd för varm dryck." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-36023.
Full textSAMMANFATTNING Det här examensarbetet utgörs av en fallstudie, där på uppdrag av August Lundh AB en ergonomiskt designad serveringskanna i plast skulle vidareutvecklas. Arbetet syftade till att vidareutveckla kannan så att den anpassades för varm dryck och tillverkningsmetoden formsprutning, för att sedan utgöra ett underlag för huruvida företaget skulle vidareinvestera i den tidigare framtagna ergonomiska designlösningen. För att vidareutveckla kannan krävdes kunskaper om tillverkningsmetoden och vilka designmöjligheter som metoden medger. Därför formulerades följande frågeställning: Vilka är de styrande faktorerna vid produktutveckling av plastprodukter som ska formsprutas? För att kunna svara på frågeställningen och utföra uppdraget utfördes en litteraturstudie om plasttillverkning som utgjorde grunden för den teoretiska referensramen som arbetet utgick ifrån. Sekundärdata insamlades genom akademisk litteratur i form av böcker och vetenskapliga artiklar. En produktutvecklingsprocess som var anpassad för fallstudien togs fram, som var ett derivat av de generiska produktutvecklingsprocesserna som den använda litteraturen presenterade. I fallstudien insamlades primärdata genom laborationer, tester, simuleringar och intervjuer för att komplettera den teoretiska referensramen. Större delen utav arbetet i fallstudien utgjordes av att finna en tillfredsställande isoleringslösning, för att förhindra att användaren av kannan ska bränna sig på grund av värmen från den varma drycken. Detta medförde att arbetet aldrig passerade konceptstadiet i produktutvecklingsprocessen. Två olika isoleringslösningar undersöktes. Den första isoleringslösning utgjordes av en pågjutning av en termoplastisk elast på greppytan. Laborationer och simuleringar visade att tjockleken som skulle krävas för att uppnå tillräcklig isolering behövde vara minst 10 mm, vilket ansågs vara för tjockt på grund av tillverkningsekonomiska aspekter och förslaget förkastades. Den andra isoleringslösningen som utreddes utgjordes av en kanna innehållandes en innerkanna, för att på så sätt skapa en isolerande luftspalt. Simuleringsresultaten indikerade att en 3,5 mm luftspalt var nödvändig för att erhålla en tillräckligt god isolering. En luftspaltsisolering i kombination med den ergonomiska designlösningen medför en rad olösta problem, som kräver vidare utredning om kombinationen ska användas. En önskan från uppdragsgivaren var att utreda om en termoseffekt kunde uppnås. Resultatet visade att en luftspalt skulle bibehålla dryckens värme cirka 10°C högre under 45 minuter, än en kanna utan isolering. För att uppnå en bättre termoseffekt skulle luftspalten kunna fyllas med ett skummaterial, för att på så sätt reducera den konvektiva värmeledningen i luftspalten. En tillverkningsmetod som eventuellt skulle kunna användas för att producera en skumisolering är reaktionsformsprutning. Fallstudien och den teoretiska referensramen visade att de styrande faktorerna vid produktutveckling av plastprodukter som ska formsprutas var de konstruktionsmässiga begränsningarna och de design-riktlinjer som finns för plastdesign. Samt tillverkningskostnaden i relation till produktens prestanda, potentiella försäljningspris och tillverkningsvolym, det vill säga att avgöra vilken designändring som medför en ökad tillverkningskostnad och huruvida den är försvarbar eller inte, i relation till vilken ökad produktprestanda som fås. Att arbeta med DFM visade sig vara nödvändigt och vara en central del av produktutveckling av plastprodukter som ska formsprutas.
Bodecker, Magnus. "Kvalitetssäkring i produktion Från identifiering till verifiering av kundbehov." Thesis, KTH, Industriell ekonomi och organisation (Inst.), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33636.
Full textThe purpose of this master thesis is to investigate and suggest how quality assurance can be accomplished and incorporated with customer needs to a product that customers want to purchase. The goal is to create a deeper understanding about quality assurance in businesses. It’s conducted by a qualitative case study to learn, analyze and describe the phenomenon. This is of interest because the requirements for quality are constantly increasing as new technology becomes available and new businesses arise. Customers require products with better quality, lower price, better performance and all this to a constantly reduced delivery time. Therefore, companies must work with a total quality management to discover customer needs and ensure that they will be fulfilled. Businesses must gain an understanding that customer satisfaction is the ultimate objective of every business: not to supply, not to sell, not to service, but to satisfy the needs that drive customers to do business. In order to enable a high customer satisfaction, different methods and tools as quality functional deployment and design for manufacture and assembly are presented within four different areas which all must have a good cross-functional cooperation. The four areas are identification of customer needs, design process, production process, and verification of quality. The identification of customer needs provides the conditions for how successful a product can be on the market. During the design process the most important decisions that affect the final price of the product is taken. The production process means that in a standard way, with minor variations, produce products that meet defined specifications. Finally, verification of quality is used to ensure that the product meet the specifications. After a theoretical framework and empirical evidence has been presented in the master thesis, an analysis and discussion is established to see how a company works with quality assurance. Finally, conclusions are presented about how companies in a similar situation can improve their efforts to ensure a higher customer satisfaction.
Fox, David, and Nils-Robin Töyrä. "Optimering av ljuddiffuser – Monteringsvänlighet och kostnadsreducering." Thesis, KTH, Tillämpad maskinteknik (KTH Södertälje), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232691.
Full textThe aim of this project has been to improve the existing noise diffuser used currently today in the oil-separatingmachines developed by 3nine AB. By reducing noise levels, increasing the air flow, increasing the “ease of assembly” and making it more cost effective. The thesis follows the product development process described in the book “Product Development - Construction and Design” by Karl T. Ulrich and Steven D. Eppinger. The work was adapted for a 10-week timeframe and divided into four phases. Phase 1 - Pre-Study, Phase 2 – Information gathering, Phase 3 - Implementation and Phase 4 - Reporting. The solution used today consists of five folded pieces of stretch metal that have been sewn together with steel wire, the noise diffuser takes a long time to assemble and to fit into the machine. The five folded pieces of stretch metal have sharp edges after cutting, which further complicates the assembly. The production cost for each diffuser is 100 kronor. For the present solution, the measurement values taken at 3nine AB's workshop were set as reference values, assembly time - 333 [s], noise level - 68 [dB], airflow - 319 [m³ / h] and DFA-index (measurement value for ease of assembly) - 5.4%. DFA-index when 100% is seen as the optimal ease of assembly and a higher DFA-index leads to reduced costs. As air flows through the machine, this affects the measured values and possible design of new prototypes, but fluid mechanics is one knowledge we lacked and therefor analysis of this was not possible and delimited. Through Idea Development Processes such as Brainstorming, 6-3-5 Brainwriting, Morphological Matrix, Pugh matrix, Concept Sketches, Virtual Concepts (3D-CAD) and Rapid prototyping (3D-prototype printing), five prototypes were produced, then tested for assembly time, noise level, airflow and DFA -index. These tests resulted in a prototype that featured improved results compared to the reference values of the existing noise diffuser. Measurement values for prototype "45° wall" where assembly time - 16 [s], noise level - 65 [dB], airflow - 342 [m³ / h] and DFA index - 93%. Risk-analysis and FEA was carried out on the same prototype to identify weaknesses in the design. The solutions to these weaknesses are recommended in the form of small design changes such as rounded sharp corners. These measured values state that the solution developed is better than today's solution and is recommended to be implemented and further developed by the company.
Hollander, Johan. "RCC-Jordfelsskydd, mätmodul för övertonsanalys." Thesis, Jönköping University, JTH, Computer and Electrical Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-11615.
Full textThe majority of all power cuts that affects individuals and communities are caused by earth faults on the power transmission lines at 10kV and 20kV level [1]. If these power cuts could be eliminated, less disturbances and interrupts would lead to large amounts of money savings.
Swedish Neutral has developed such a protection system. When an earth fault occurs power is injected into the neutral point of the transformer. The RCC (Residual Current Compensation) protection calculates a compensation current exactly 180 degrees out of phase to the fault current. Doing this, the voltage at the fault location becomes very close to zero, without affecting the power transmission.
The protection system can only compensate automatically for the fundamental frequency (50Hz), and manually for the 3rd, 5th, 7th and 9th harmonics. In most cases, when the harmonics are very small it is not necessary to compensate for them. There are though cases when compensation for the harmonics is necessary.
This thesis focuses on finding the best method to extract the content of a sampled signal regarding both simplicity and speed. Both amplitude and phase of each harmonic must be calculated. Is the proposed method suitable for the current computer system and how can it easily be implemented.
Because the fundamental frequency is known and the harmonics are all multiples of the fundamental frequency it makes the task less complex. It is not necessary to use the FFT algorithm. The DFT can be calculated using correlation. Both phase and amplitude can be calculated very precisely with few samples and not so many computer operations.
Johansson, Hanna, and Maria Sundin. "Produktutformning och materialval för formsprutning : beträffande polymera material." Thesis, Linköpings universitet, Maskinkonstruktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-138501.
Full textInjection molding is a manufacturing method that requires specific features to attain manufacturability. Gating suitability requires analysis and mere guidelines do not always provide the correct gate placement. Material selection requires a pronounced specification and is preferably supervised by an expert. Guidelines concerning design for manufacturing and assembly include, among other things, recommendations directly affecting the shape of the product. The aim for this bachelor thesis is to aid product developers and designers in taking manufacturing aspects into account early in the product development process. This is achieved by providing them with guidelines regarding material selection, injection molding, as well as design for manufacturing and assembly. The thesis is limited to thermoplastic materials suitable for injection molding and its results are based off thorough literature research, interviews and case studies. This bachelor thesis project, which is conducted at Linköping University,is a part of a project calledSafe manual assembly tools, and the resulting portable enabling device developed in Safe manual assembly toolsis used as case studies in this thesis. The case studies include: evaluation of concepts concerning manufacturability; material selection; and injection molding analysis through the software Moldflow. The thesis results in guidelines concerning design for manufacturing and assembly, injection molding and material selection. The case study is requited with concept selection suggestions, a selection of material that meets the specification of requirements stated in Safe manual assembly tools and design recommendations that aim to improve the manufacturability of the concept. This bachelor thesis concludes that design alterations striving to meet requirements for manufacturability should be made early in the devolpment process. Visiting the polymer-based product manufacturing industry offers better insight into which requirements that need to be fulfilled to make a product producible. Injection molding simulation software, if such is available, should be used in combination with design guidelines.The thesis also concludes that material selection is simplified through early contact with suppliers of material. Material selection is based off the specification of requirements and therefore requirements specified in the specification should be clarified and have their plausibility confirmed before the selection takes place.
Vattamparambil, Nalan Vishnu, and Suraj Satheesan. "Life Cycle Perspective in relation to ISO 14001 : 2015 and associated impacts of Design For Environment (DFE) and Sustainable development." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-42235.
Full textHaraldsson, Anna. "Den oskyldigt dömdes utredningsmöjligheter för att ansöka om resning : En studie med särskilt fokus på bevarande av bevismaterial och begäran om DNA-testning efter lagakraftvunnen dom." Thesis, Uppsala universitet, Juridiska institutionen, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-371791.
Full textSyftet med denna uppsats är att utreda den oskyldigt dömdes utredningsmöjligheter för att ansöka om resning enligt 58:2 p.4 Rättegångsbalken (RB), med särskilt fokus på bevarande av bevismaterial och begäran om DNA-testning efter lagakraftvunnen dom. Eftersom kravet på förundersökningens återupptagande enligt 58:6a RB ställs högt, är den dömde, med mycket få undantag, lämnad åt att själv vidta utredningsåtgärder, men utan laglig rätt att få tillgång till allt bevismaterial i fallet. Detta är ett stort problem då den dömde skulle behöva få till stånd nya forensiska eller kriminaltekniska analyser på materialet, i syfte att rentvå hen från skuld, genom att exempelvis använda den nyaste DNA-tekniken, som inte fanns tillgänglig vid den ursprungliga förundersökningen. Därför finns det ett starkt intresse av att bevismaterial, främst spår, bevaras efter domen har vunnit laga kraft. I denna uppsats argumenterar jag för att bevismaterial, såsom spår, inte endast bör bevaras med hänsyn till intresset av att klara upp kalla fall, utan även beträffande möjligheten till framtida ansökan om resning - åtminstone om det brott som begicks var ett allvarligt sådant. Enligt min studie är det en vanlig uppfattning bland polisen att bevarandet av bevismaterial, såsom spår, är oreglerat. Jag argumenterar för att arkivlagen, som reglerar den allmänna skyldigheten för statliga myndigheter att bevara allmänna handlingar, även är tillämplig lag avseende spår. Följaktligen föreslår jag att myndigheter bör bevara alla dessa typer av material. Alternativt borde den dömde underrättas av lämplig myndighet att bevismaterialen ska hävas, och ge hen rätt att begära, inom viss tid, att bevismaterialen ska fortsätta att bevaras. Dessutom konstaterar jag att det bör införas en möjlighet för den dömde att begära ny DNA-testning efter lagakraftvunnen dom i Sverige, likt regleringen på federal nivå i USA, samt att kravet på förundersökningens återupptagande enligt 58:6a RB bör sänkas. En annan lösning skulle vara att göra det möjligt för domstolen i enlighet med 58:6b RB att förelägga åklagaren att vidta viss utredningsåtgärd när det kan antas leda till förundersökningens återupptagande. Om inte dessa förändringar sker bör åklagaren åtminstone ha möjlighet att vidta utredningsåtgärder, som att t.ex. initiera ny DNA-testning, genom att utnyttja möjligheten att delvis återuppta förundersökningen.
Metzendorf, Christoph. "Mitochondrial Iron Metabolism : Study of mitoferrin in Drosophila melanogaster." Doctoral thesis, Uppsala universitet, Jämförande fysiologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-114201.
Full textEjimadu, Geraldine. "The effect of the shoe sole on Plantar Pressure distribution." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278745.
Full textPatienter med DM har minskad taktil känslighet och atrofi i de små musklerna i foten, vilket resulterar i högatryckpunkter som kan för bli obemärkta. Det ökade trycket kan orsaka mikrotrauma som leder till sår. På grund av Diabetes Mellitus, läker inte DFU lätt. Upp till 25% av dem kommer att utveckla diabetiska fotsår (DFU), och 25% av DFU: er som inte läker leder slutligen till amputation. Detta examensarbete kommer att beskriva och samla resultat från ett nyförvärvat stort internationellt EU-projekt (EIT Health 2020-2022) mellan tre universitet och tre företag i hela Europa. Denna samarbetsgrupp kommer att vara den första att förebygga problemet med diabetiska fotsår med ett innovativt skokoncept diabetiska fotsår med ett innovativt skokoncept. De kommer utföras med sju olika inställningar som lätt kan modifieras för att undvika sår på olika områden i foten. Som en första pilot fokuserar detta examensarbete på analys av plantartryckfördelning genom att använda de innovativa DR Comfort-skorna baserade på de justerbara ”rocker”-profilerna, som används som en prototyp för att förebygga bildningen av Diabetic Foot Ulcer (DFU) hos patienter som drabbats av Diabetes. Den här avhandlingen fångar rörelsen hos friska personer med olika skosulor medan de går i olika hastighet och analyserar värdena för det maximala plantartrycket med användning av pedar-x. Pedar-x är en mätanordning för plantorns tryck i skon. Utvärderingen av de justerbara ”rocker”-profilerna gjordes genom beräkning och analys av de signifikanta skillnaderna i top plantartrycket samt analysen av plantartryckets maximala medelvärde (MMP). Resultaten av denna studie visar en minskning (även om den inte betydlig) av de områden som mest drabbats av DFU. Denna studie kan inte generaliseras till diabetespatienter eftersom etiskt godkännande ännu saknas.
Roy, Sajib, and Md Murad Kabir Nipun. "Understanding Sub-threshold source coupled logic for ultra-low power application." Thesis, Linköpings universitet, Elektroniksystem, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-69404.
Full textSvensson, Pamela H. W. "Valence Band Properties of the Ruthenium Complex Catalyst Using Ab Initio Theory." Thesis, Uppsala universitet, Materialteori, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-359394.
Full textFerreira, Cunha Cristina J. "Rezeptionsästhetische Literaturdidaktik im DaF-Unterricht. Das Bilderbuch als Anlass für Unterrichtsgespräche über das Thema: Der Umgang mit dem Fremden : Antje Damm, Der Besuch. Bild-/Textanalyse und literaturdidaktische Vorschläge." Thesis, Stockholms universitet, Institutionen för slaviska och baltiska språk, finska, nederländska och tyska, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-175374.
Full textKavakure, Jules. "Managing risk factors for caries with behaviour change approach : a systematic literature review and observational registry study." Thesis, Högskolan Kristianstad, Fakulteten för hälsovetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-21445.
Full textKuipers, Nathanaël. "Appropriate instructions for manual assembly workers in industrial manufacturing settings: factors to consider." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-42186.
Full textEliah, Dawod Ibrahim. "Structural integrity of highly ionized peptides." Thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-387886.
Full textKveselys, Donatas. "Weld Producibility Assessment System : Evaluation of Producibility Assessment tools using Set-based approach in Multi-disciplinary Aerospace Design." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Produktutveckling, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-36010.
Full textSvensson, Pamela H. W. "Everything you wanted to know about the TPA molecule adsorbed on Au(111)." Thesis, Uppsala universitet, Materialteori, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-417648.
Full textVolkov, Anton. "Ionic and electronic transport in electrochemical and polymer based systems." Doctoral thesis, Linköpings universitet, Fysik och elektroteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-135429.
Full textNilson, Katharina. "Phthalocyanines on Surfaces : Monolayers, Films and Alkali Modified Structures." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis Acta Universitatis Upsaliensis, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8209.
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