Chalmers Open Digital Repository

Welcome to Chalmers Open Digital Repository!

Here you can find:

Student theses and papers
Digital special collections, such as Chalmers modellkammare
Selected project reports

Research publications, reports and dissertations can be found in research.chalmers.se

Communities in Chalmers ODR

Select a community to browse its collections.

Now showing 1 - 2 of 2

Recent Submissions

Framställning och utvärdering av nanokompositer innehållande polyamid-12 och nanokristallin cellulosa
(2026) Kalméus, Maria; Lemark, Liam; Mäkk, Hampus; Pettersson, Elin; Pettersson, Maja; Vendel, Alexander
The global production and consumption of plastic has increased significantly in recent decades, resulting in major environmental challenges related to the use of fossil-based raw materials. One potential approach to reducing this dependence is the incorporation of bio-based materials into existing polymer systems. In this study crystalline nanocellulose (CNC), a bio-based material, was investigated as a reinforcing agent in polymer compo sites. CNC was produced and chemically modified on the surface to improve its compatibility with hydrophobic polymers, since CNC is hydrophilic. Two different azetidinium salts we re used for the modification: 6-6-Az and 8-8-Az. The modified solutions were then dried to enable compounding with polyamide-12 (PA-12) through extrusion. The properties of the resulting composites were evaluated with respect to mechanical properties and thermal stability. The results regarding the mechanical properties generally showed that stiffness and strength increased with increasing CNC weight fraction, while elasticity decreased. Compared with PA-12, all composites displayed improved stiffness and strength, although their elasticity was reduced. The results regarding the thermal stability showed that the modified compo sites, with 2 weight percentage, had a slightly lower degradation temperature than PA-12. Although modified CNC showed improved thermal stability compared to unmodified. To conclude, the results demonstrate that chemically modified CNC can successfully be used as reinforcing agents in PA-12 composites. The modifications resulted in only minor changes in the thermal stability of the material, with both modifications showing similar effects. When comparing the two modifications, no definitive conclusions could be drawn regarding their influence on the overall material properties. However, clear trends were observed with respect to CNC content: increasing CNC weight percentage led to increa sed stiffness and decreased elasticity of the composites. These findings indicate that the material properties can be tailored through adjustment of CNC content, thereby enabling potential application in a range of different fields.
Modellering och styrning av laddinfrastruktur för elfordon i nätet - Analys av laddningsmetoder i framtidens elnät
(2026) Jonasson, Simon; Rimsby, Ludwig
Klimatförändringar och växthuseffekten är idag en stor drivande faktor i teknikens utveckling. Det skapas ständigt nya trender, regler och lagar med fokus på att försöka så småningom få ett fossilfritt samhälle. En av de största bidragande orsakerna till problemet är fordonsindustrin. Under det senaste decenniet så har en stor förändring börjat ta form, där el och hybridfordon har blivit allt mer populärt. Allt pekar på att elfordon är det som ska ersätta de konventionella fordonen över tid. Denna omställning innebär nya utmaningar för samhället, där elnätet hamnar i fokus. Utvecklingen kräver en noggrann analys av hur elnätets kapacitet hanterar elförbrukningen idag samt vad som kommer krävas i framtiden. För att underlätta för elnätet krävs det att effekttoppar som kan uppstå minimeras då efterfrågan är som högst. Olika laddningsmetoder för elfordon är ett exempel på en metod som gör just detta. I denna studie undersöks olika laddningsmetoder och hur de samspelar för att minska effekttoppar och kostnad per hushåll. Verklig data för hushållsprofiler och elprisprofiler har inhämtats från Göteborg Energi. En modell har skapats i Matlab för att kunna simulera olika fall och ta lärdom om laddningsmetodernas egenskaper. Tillsammans ger laddningsprofilerna och hushållsprofilerna ett resultat som visar hur det ser ut idag, samt hur det kan komma att se ut i framtiden. Resultatet visar att de enskilda laddningsmetoderna simulerade var för sig, har generellt sett en negativ påverkan på elnätets effekttoppar. Men när metoderna delas upp och kombineras så finns det vissa fall som sänker både medeleffekt och effekttoppar i nätet. Trots att teorin visar att det finns konstellationer som är bra så diskuteras även dess relevans och möjlighet att fungera i verkligheten. Att skapa en fördelning av hur och när människor laddar sina bilar riskerar att påverka tillgängligheten, vilket är en viktig del i dagens samhälle.
Dynamic Edge-Server Data Processing for Vehicle Geofencing
(2026) Brogeby, Agnes; Ebbesson, Victor
Geofencing can be used to contain vehicles to a virtually defined area. A type of geofence that does this is the Model Predictive Geofence (MPG), which provides a way to contain vehicles within a geofence by using precomputed safety information from Hamilton-Jacobi reachability analysis. This enables predictive safety checks during operation, where a vehicle can determine whether its current state will lead to leaving the geofence before the geofence boundary is actually crossed. However, the resulting data can require large amounts of memory, making it difficult to store the full MPG on resource-constrained vehicle computers. This thesis investigates whether predictive geofencing can be used on vehicle computers without storing the complete geofence data onboard. To address this, Dynamic Adaptive Loading of Spatial Datasets (DALOSD) is proposed, where the data of the MPG is divided into smaller segments that are requested from a remote server based on the vehicles current position and predicted future movement. The loading scheme uses a spatial window to determine which segments to load, keep, and discard, and introduces prioritization and speed limitation mechanisms to reduce the risk of missing required data during operation. The results show that DALOSD significantly reduces onboard memory consumption while still providing access to the required MPG data under suitable network conditions.
Sisyphus: A Flash Cartridge Prototype for the Nintendo Entertainment System Using FPGA-Based Hardware Emulation
(2026) Abdou, Jowan; Moghaddam, Ali Amini; Gällblad, Daniel; Lindgren, Lucaz; Markström Stenhammar, Elliot; Täng, Albin
This thesis presents Sisyphus, a flash cartridge prototype for the Nintendo Entertainment System (NES) that utilizes FPGA-based hardware emulation to replace traditional game cartridges. The system architecture employs a modular hardware design utilizing Dynamic Function eXchange (DFX) on the Diligent ZedBoard—a popular development board. This allows for runtime reconfiguration to support different memory mappers, with initial implementations focusing on NROM, UxROM, and MMC1 to provide foundational coverage of the NES game library. To ensure operational stability across asynchronous clock domains, a custom synchronization pipeline was developed to mitigate signal disturbances inherent in the prototype’s physical assembly. Results demonstrate a functional end-to-end pipeline, successfully booting, configuring, and executing NROM-based titles such as Super Mario Bros., Ice Climber, and Donkey Kong on PAL-region consoles. While the prototype exhibits graphical artifacts and significant stability issues caused by the physical assembly—with most tested titles consistently freezing or crashing—it establishes a solid architectural foundation for further research and development. Due to a hardware fault in the debug card used, UxROM and MMC1 mappers were implemented, but could not be validated on hardware.
Pixel Pals — Design, study, and evaluation of a collaborative game
(2026) Andersson, Anton; Björklund, Filippa; Carlsson, Hannes; Krook, Alfons; Lindgren, William; Ohlsson, Philip
This report measures how collaborative different Game Design Patterns are by creating a four-player collaborative game, holding playtesting sessions, and analyzing the data collected from them. The project used an iterative approach to game creation, and for the analysis, Cooperative Performance Metrics were employed. The project annotates which of the patterns Concurrency, Complementary roles, Synergies between abilities, Shared puzzles, Separation gate, Gathering gate, Encrypted information, Indirect actions, and Shared resources give results in which metrics and tries to give an estimate of what patterns make for the most collaborative experience.