Fraunhofer Chalmers Research Centre for Industrial Mathematics
Chalmers Publication LibraryNot a member yet
70439 research outputs found
Sort by
Viktreducering och Omdesign med Additiv Tillverkning
No full textAdditiv tillverkning, som i vardagligt tal kallas 3D-printning, är en tillverkningsteknik
som bygger komponenter genom att addera material istället för att ta bort material. Det här ger en unik möjlighet till större designfrihet samt viktreducering
hos komponenter. Inom bilindustrin, där minskad bränsleåtgång hos bilarna är högt eftersträvat, blir därför additiv tillverkning intressant. Därför har CEVT initierat projektet med syfte att utreda i vilken grad viktreducering och omdesign är möjligt för en axel i en växellåda samt hur tillverkningsprocessen genomförs. Projektet är en studie om vilka möjligheter tekniken ger inför framtiden och därför görs avgränsningen
i projektet om att produktionskostnaden ej kommer att undersökas. Arbetet utgår ifrån axeln som CEVT tillhandahöll och på den utförs en analys
för att klargöra vilka förutsättningar komponenten har. Utifrån det optimeras den ursprungliga komponenten för att sedan beredas och tillverkas med pulverbäddstekniken
Direct Metal Laser Sintering.
Rapporten visar den arbetsprocess som ligger till grund för produktutveckling där komponenter omdesignas och optimeras med hjälp av additiv tillverkning. Arbetsprocessen följer stegen finit element analys, topologioptimering, simulering av tillverkningsprocessen,
materialval, beredning av CAD-modellen och prototyptillverkning. Resultatet mynnar ut i en reducering av vikten hos den ursprungliga axeln
med 25,0%. Det konstateras även i rapporten att det för komponenter med högt ställda toleranskrav krävs efterbearbetning på grund av att tekniken innebär en begränsning när det gäller att uppnå ytfinhet. Resultatet och tillvägagångssättet som presenteras i rapporten kan även användas som en fingervisning till hur applicerbart
additiv tillverkning i dagsläget är på komponenter liknande axeln som projektet är baserat på
RFID tags, GPS trackers, and how they can benefit Original Equipment Manufacturer's packaging flow
No full textThe use of smart packaging solutions has increased during the past years where the track and trace technologies have made the packaging easier to track and contributing to a more efficient supply chain. The usage of an RFID tag or GPS tracker attached to a company's assets such as packaging has increased. Together with a good information sharing between actors in the supply chain the knowledge of where everything can be used for more accurate planning in the operations at the actors.
There are companies within the automotive industry that own their returnable packaging. One of them is the OEM company that the researchers for this research have been working with. For this thesis, the aim has been to get an understanding of how RFID tags and GPS trackers can be beneficial for an OEM company if the technology was attached to the OEM´s returnable packaging.
In order to fulfil the aim, the researchers have done study visits at the different actors to understand the working processes at each actor. Furthermore, interviews with employees at the actors have been made in order to get their views on their work and if they could see if the track and trace technology can be beneficial for them or not. The findings from the study visits were later analysed together with the literature about packaging, track and trace technology, and material flow. From the analysis the researchers state the results and after the conclusion in order to answer the aim. It was shown that track and trace technology can be beneficial for the OEM company however, more investigation is needed to know which type of technology is the best for what packaging type
Bridge as a place: Travelling Urban Fabric along the Götaälvbron Bridge in Gothenburg City
No full textEngineering design of a radar structure using design of experiments and structural optimization
No full textModels of complex systems contain a large amount of different parameters and several constraints, which make
structural optimization very time consuming. Therefore, Saab AB wanted to develop a method based on Design
of Experiments to use for optimization within structural analysis and concept generation. Consequently, the
purpose of the project was to develop a method that efficiently evaluates concepts and new products with
regard to structural analysis in product development. The method was used to ease the evaluation of different
concepts, as well as the understanding of the impact that the parameters had on the system. The method was
developed by using three different trial cases in order to learn to use the different software, as well as developing
and fine tuning the method. Thereafter, a simplified version of an authentic, complex problem from Saab was
evaluated using the developed method.
Different Design of Experiments methods were investigated while executing the first sample cases. Thereafter,
only one of the Design of Experiments method, called Hammersley, was used in order to make the simulations
equivalent. The second and third cases were created in order to learn how to, for example, model and
parameterize the concepts. The advanced case consisted of a simplified version of an existing analysis model
from Saab's product portfolio. The original existing analysis and simplified models were both evaluated and
the results obtained from the two cases were compared to each other. This was done in order to be certain
that the behaviour of the simplified model resembled the behaviour of the original model. When the simplified
model was assumed to be sufficiently accurate, a new concept based on the simplified model was created and
analyzed using the developed method. The method used structural optimization and informed about which
parameters that in
uenced the specified objective function and which parameters that could be neglected. The
advanced case had six different design variables and the number of values each parameter had ranged from 2 to
11. In the software HyperStudy, the Design of Experiments method Hammersley calculated that 105 concepts
had to be created in order to get a sufficient optimization. Thus, 105 evaluations were executed, since one
concept needs one evaluation. By using this method, the number of parameters was, in the advanced case,
reduced from six to two, which saves both computational and optimization time
Lignin-based bio composites: Exploring compatibility and potentials in a batch system
No full textThe growing concern of the depletion of fossil resources as well as the increasing awareness of the environmental impact of petroleum-based products has led to an
increased interest in materials based on renewable resources. One of the most abundant natural resources in Sweden is wood, providing, among other, material for the paper and pulp industry. The processes used in this industry creates lignin as a byproduct,
most of which is used as a low-cost bio-fuel. An attractive alternative to this use would
be to modify the lignin to be used as a value-added thermoplastic polymer. The Swedish company RenCom is contributing to this work by developing a
thermoplastic lignin that can potentially be blended with ordinary thermoplastics, creating bio-composites. This master thesis aims to produce and investigate different
thermoplastic composites containing modified lignin. The final material properties will be analyzed to find potential matrices of interest for the further development of ligninbased composites
