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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.
131

Axlar och upphängning till bromsvagn : Avsedd för klimatiska tester av fordon / Axels and linkage to braking trailer : Intended for climatic testing of vehicles

Sjöström, Alexander January 2018 (has links)
Detta examensarbete är en del av fyra i förstudien till projektet Bromsvagn. Projektet Bromsvagn är tänkt att skapa en testutrustning i form av ett släpfordon. Vars yttersta uppgift är att testa långvariga belastningar av fordon i full drift. I detta examensarbete konstrueras axlar och upphängning på konceptnivå. Konstruktionen sker i programmet CATIA V5 utifrån de av BAE Systems Hägglunds AB givna förutsättningarna för tillverkning.Vissa komponenter kommer förbrukas under vagnens livslängd, till dessa kopplas relevanta underleverantörer av standardkomponenter. På utvalda modellerade delar kommer hållfasthet beräknas via handberäkningar och FEM-analyser i denna del av CATIA V5. Vid modelleringsarbetet tas hänsyn till påverkan av två parallella examensarbeten i samma projekt. Dessa två examensarbeten behandlar konstruktionen av chassit och utformningen av hydraulsystemet.Slutsatsen är att denna konstruktion har potentialen till att klara den tänkta upp uppgiften. Beräkningarna konstaterar att de modellerade delarna kommer klara sina teoretiska krafter utan större problem. Dock rekommenderas vissa fortsatta beräkningar i framtida projekt. / This degree project is one part of four in the preliminary study of the Bromsvagn project. The Bromsvagn project is intended to create a testing equipment in the form of a trailer. Our ultimate task is to test long-lasting loads of vehicles in full operation. In this thesis the design of axels and suspension will take place at the concept level. The construction takes place in the program CATIA V5, based on the manufacturing conditions provided by BAE Systems Hägglunds AB. Some components will be consumed during the life of the trailer, to which relevant subcontractors of standard components will be linked. On selected parts of the model, strength will be calculated by hand calculations and FEM-analyzes in this part of the CATIA V5 program. The modeling work considers the influence of two parallel examinations in the same project. These two degree projects deals with the design of the chassis and the design of the hydraulic system. The conclusion is that this design has the potential to cope with the intended task. The calculations indicate that the modeled parts will manage their theoretical powers without major problems. However, some calculations are recommended in future projects.
132

Omkonstruktion av kilverktyg och flänsöppnare : till Simson Power Tools hydrauliska handpump

Eriksson, Erik, Eriksson, Linus January 2018 (has links)
The company Simson Power Tools in Hofors manufactures and sells hydraulic power tools. One of the company’s product is a compact hydraulic hand pump. The pump is primarily used as a power source for jacks, but can also be used for other hydraulic tools. Two tools to which the pump is used for is a wedge tool and a flange opener. These two tools are mainly used in industry, for example when replacing gaskets in flange joints. The constructions are powerful and manage to handle loads of 4 and 15 tons.   In meetings with the company it emerged that they saw potential for the wedge tool and the flange opener to be able to sell better than before. The tools together with the hand pump are flexible and easy to use in difficult environments. In order to increase the sales of the products, the company wants to lower prices but at the same time maintain, alternatively increase the quality.   The wedge tool and flange opener are currently purchased from other manufactures, which limits Simson Power Tools pricing. Because the tools are old and no patent exist, the company wants to manufacture the tools on its own, which provides opportunity to combine the tools with the company’s hand pump as well as optimize technical manufacturing and economic manufacturing.   When the customer’s desires were identified a current situation analysis was performed. The work process began by sketching up the purchased tools in Autodesk Inventor 2017 in order to create an overview of geometries and functions. Then material analyzes were performed on the tools. The purpose of analyzes was to provide a basis for decisions about material selection and machining of components surfaces as toughness, hardness and roughness which are crucial parameters for the functionality of the tools.   The project resulted in that the tools became more compact and weigh less than the purchased, especially when cylinder is integrated with the hand pump. The wedge tools plates and the upper and lower part of the flange opener which are exposed to great wear are recommended to be manufactured in Hardox 450 which has higher strength than previous design. Further work is to make tests on manufactured prototypes to check whether design changes work in real cases.   A price staircase has been developed for the manufacture of the tools components and purchase of return spring, gaskets and sliding bearing. The price staircase indicates price per tool depending on order quantities. With the price basis, the company can plan the amount of tools that should be manufactured based on manufacturing cost and customers demand.
133

Thermal Contact Conductance in Aircraft Applications

Andersson, Victor January 2018 (has links)
No description available.
134

Study of the application of LeanManufacturing techniques in the food industry

Allahham, Hammam January 2018 (has links)
No description available.
135

Alternativ sammanfogning till svets på vagn / Alternative joining to welding on wagon

Oskarsson, Erik, Cicek, Ayhan January 2018 (has links)
Lim undersöks för att se om företaget, Cidan Machinery, kan ersätta de existerande svetsfogarna på en komponent till deras kantviksmaskiner. Detta för att undvika det merarbete vilket svetsning medför eftersom konstruktionen kan bli skev av de spänningar vilka uppstår när den svetsade konstruktionen svalnar. Med hjälp av en analys med finita elementmetoden(FEM) kan en uppfattning av var de största spänningarna i vagnen inträffar skaffas. Litteraturstudien innefattar spänningarna uppstående av svetsning, förklaring av svetsmetoden Metal Active Gas, MAG, samt alternativa metoder till svetsning. Huvudfokus läggs på limning eftersom uppdragsgivaren har önskat detta. I litteraturstudien behandlas åldring vilket är en viktig faktor vid undersökning av hållfastheten hos lim över dess livslängd. Eftersom dragprov användes för att testa olika lim tas även detta upp.De testade limmen klarade av lägre spänning än väntat vilket kan bero på ytan hos provbitarna då denna var oslipad och belagd med ett oxidskikt. Ingen direkt effekt av åldringen kan ses vilket leder till att en uppskattning av livslängd ej kan göras. Analyser av konstruktionen visar var de största spänningarna uppstår och vid jämförelse med resultatet med dragprovet kan en del svetsfogar inte ersättas med lim. Sammansättning med lim är aktuellt i detta fall men eftersom alla sammanfogningspunkter inte kan limmas för att klara av spänningarna kan företaget inte överge svetsningen helt.
136

Control Oriented Modelingof Engine Out Temperatures

Malm, Lars January 2018 (has links)
To have knowledge about the exhaust temperature is of great importance in several ways. Knowing the exhaust temperature means that it is easier to protect the catalyst and turbine from too high temperatures but it also important in controlling the turbine power.In this thesis a physically based model of the engine out temperature is developed. The model is built up by two different cylinder pressure models and one engine out temperature model. Measurements has been made using a test engine at Linköping University. These measurement has then been used to  parameterize and validate the model. Since the measurements of the engine out port temperature are not showing reasonable temperatures, the temperatures in the pipes has been used for validation. That makes the results less reliable since no heat transfer between the port and pipe are considered in the model.
137

Optimering av grid LED-armatur : Optimization of grid LED-armature

Nyström, Anton January 2018 (has links)
Nordic Light are one off the leading companies in manufacturing and development of lamparmatures and have been doing that since 1980. Since LED lamps are getting more and more common, the demands on optimizing thearmatures are rising. Because of the competition in the lamp industry the customers put highdemands on the efficiency and price. The purpose of this paper is to optimize an existingarmature and the focus will be on efficiency and manufacturing costs. An analysis of the existing armature was made to establish the function and cost of everycomponent. This was the foundation for the ideation of the new armature. To ensure that thenew armature would manage the requirements, a calculations of manufacturing costs and ananalysis in OpticStudio was made. The result shows a solution more cost efficiant than the original with high efficiency where itis possible to attach the armature in the roof or to profiles. It is recommended to make aprototype and to perceive with additional calculations before the manufacturing starts.
138

Reducering av icke värdeskapande aktiviteter vid tillverkning av träemballage

Hansson, Andreas January 2018 (has links)
Emballagefabriken tillverkar förpackningslösningar i form av trä- och plywoodlådor. Låg lönsamhet råder på företagets manuella monteringsavdelning på grund av lång genomloppstid vid tillverkning av produkten Plywoodlådan. Tillverkningen sker i fyra steg och börjar vid sågavdelningen följt av tryckeriet sedan cnc-avdelningen och till sist monteringen. Syftet med arbete var att reducera de icke värdeskapande aktiviteterna som uppstod i produktionsflödet. För att få en överblick av nuläget genomfördes en materialflödesanalys följt av en förstudie, som identifierade vilka aktiviteter som utfördes på respektive avdelning. Med detta som bakgrund genomfördes kvantitativa tidsstudier av aktiviteterna parallellt med kvalitativa observationer. Slutligen klassificerades samtliga aktiviteter med hjälp av produktionspersonal och produktionschefen. Tidsstudierna resulterade i en kartläggning av de icke värdeskapande aktiviteterna, som sedan analyserades. Slutligen togs förbättringsförslag fram som företaget kan implementera. Slutsatsen av arbetet visade att det fanns potential att reducera, och i vissa fall eliminera de icke värdeskapande aktiviteterna. / Emballagefabriken manufactures packaging solutions made of wood and plywood. Low profitability prevails on the manual assembly department of the company, due to a long throughput time in the manufacture of the Plywood box. The production is performed in four steps and begins at the saw department followed by the printing department, then the cnc department and finally the assembly. The purpose of this work was to reduce the non-value-added activities that occurred in the production flow. To get an overview of the current situation, a material flow analysis was performed followed by a preliminary study that identified which activities were performed in each department. With this in mind, quantitative time studies of activities were conducted in parallel with qualitative observa-tions. Finally, all activities were classified in cooperation with production staff and production manager. The time studies resulted in a mapping of non-value-added activities, which were then analyzed. Finally, improvement proposals were put forward that the company could implement. The conclusion of the work showed that there was potential to reduce, and in some cases eliminate, non-value-adding activities.
139

Omkonstruktion av Kompakt Punchmaskin till Peirce-Smith Konverter / Reconstruction of Compact Punching Machine to Peirce-Smith Converter

Sundell, Hannes January 2018 (has links)
No description available.
140

Industrialization of a scale for a high pressure feeder : Concept generation, design and industrialization of a product / Industrialisering av en skala för en högtryckskik : Konceptgenerering, design och industrialisering av en produkt

Gustafson, Jacob January 2018 (has links)
This master thesis describes a project during which a new product was developed that will measure the wear of a high pressure feeder in the conventional feeding line in a paper mill. The product will also be industrialized so that it can be manufactured in smaller series. previously, wear has been measured with a metal scale where the operator read the values and documented them manually. The goal of this project was to develop the mechanical parts of a product that will automatically measure the wear distance, gather the information and present the data. The project followed the classic product development process that was slightly modified to fit this specific project. A pre-study of the market and the current product gathered the information needed to generate a large number of concepts. The concepts were then eliminated in order to select the final concept that was the best solution for the problem based on the requirements given by the company. Once the concept was chosen it was modelled using a CAD-software (Compute Aided Design). Most of the components are standard components that can be “bought off the shelf”, which means that it should not be too many special parts that will cost a lot of money and time to manufacture. The product is also IP67-classified which means that it can manage the water and white liquor (mainly sodium hydroxide and sodium sulphide) that are present in a conventional feeding line in a paper mill. The result consists of a description of the final product. The company have also been provided with CAD-files and a manual on how to build the product. The company have also been provided with a list of all the standard components and where to buy them. During the project, some of the requirements have been changed by the global development team which made the project harder and the final product is different from the initial thought. However, the goal was reached, and the company have information and concept to use as inspiration for the next generation of this product. The final product is a robust box that can easily be mounted onto the high pressure feeder. The lower part of the box consists of the mechanical parts that are linked to the electrical parts which are in the upper part of the box. / Det här examensarbetet är ett project där en ny produkt har tagits fram som mäter förslitningen på en högtryckskik i det konventionella flödet i ett pappersbruk. Produkten skall också vara industrialiserbar så den kan tillverkas i en mindre serie. Tidigare har det varit en stållinjal som operatören läser av och dokumentarer värdena manuellt. Målet var att utveckla de mekaniska delarna på en produkt som automatiskt mäter förslitningen, samlar informationen och presenterar datan. Projektet följde den klassiska produktutvecklingsprocessen som var lite modifierad för att passa detta specifika projekt. En förstudie av marknaden och den nuvarande produkten fick ihop den informationen som krävdes för att ta fram ett flertal koncept. Koncepten var sedan eliminerade tills det endast var ett koncept kvar som är det optimala konceptet baserat på de krav som företaget har ställt. När det slutliga konceptet var bestämt visualiserades det med hjälp av CAD. Alla komponenter är standard- komponenter som kan ”plockas direkt från hyllan”, vilket betyder att det inte skall vara några specialtillverkade delar som kostar mycket pengar och tid för att göra det lättare att industrialisera produkten. Produkten är också IP67-klassifierad vilket betyder att den kan klara av vattnet och kemikalierna i ett pappersbruk. Resultatet består utav en verbal beskrivning av den slutliga produkten. Företaget har blivit försedda med CAD- filer och en manual för hur man skall bygga produkten. Företaget har även blivit försedda med en lista över alla komponenter samt vart dom går att köpa. Under projektets gång har några krav ändrats utav det globala utvecklingsteamet vilket gjorde projektet svårare samt att den slutliga produkten inte blev likt den initiala tanken. Målet nåddes och företaget har även information och koncept som kan användas som inspiration inför nästa generation av produkten. Den slutliga produkten är en robust låda som lätt kan monteras på högtryckskiken. Den nedre delan av lådan består utav det mekaniska delarna som är kopplade till de elektroniska delarna som är i den övre delen av lådan.

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