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Senast publicerade

Railway Plans: Connecting the Scandinavian and German rail networks via the Fehmarnbelt tunnel
Agiazi, Gkerilnto; Harden, Simon; Leurs, Ben; Woszczek, Filip
This project is part of a master's programme course named Project in Railway Technology at Chalmers University of Technology. The report investigates the construction of the Fehmarnbelt fixed link between Denmark and Germany and analyses the effects and the coming demand following its opening. The opening of this sub-sea tunnel will have a massive impact on the transportation systems, in particular the railway networks of both Germany and Denmark, as well as Sweden and Norway. The research has been conducted through literature studies based on the available documents on construction and plans for its connections in the four most affected countries. The results indicate that Denmark has successfully improved and planned their infrastructure network for the opening of the connection, while Germany, Sweden and Norway are lagging behind, which in turn will result in the Fehmarnbelt fixed link not being able to meet its expected capacity until certain bottlenecks will be improved. The most critical bottlenecks that likely will still be in place after the opening of the tunnel is the Fehmarnsundbridge and the Swedish Southern Mainline.
Utveckling av en stötdämpardynamometer för bättre fordonsdynamik
(2026) Andersson, Ludvig; Folkesson, Melker; Jonsson, Joel; Karlqvist, Ludvig; Steen, Oscar; Tiainen, Theo
Denna rapport dokumenterar utvecklingen av en stötdämpardynamometer utförd på uppdrag av Chalmers Formula Student (CFS). Arbetet omfattar hela kedjan från kravställning och beräkningar till den praktiska tillverkningen av testriggen i Chalmers verkstäder. Bakgrunden till arbetet är teamets behov av att kunna karak- terisera och validera beteendet hos bilens stötdämpare under kontrollerade former. Kommersiella testriggar är ofta för kostsamma och inte anpassade för de specifika laster och komponenter som används i Formula Student. Genom att utveckla en skräddarsydd lösning skapas förutsättningar för att optimera bilens väghållning och förkorta den tidskrävande processen med iterativa ändringar av dämparinställningar vid testning av bilen. Konstruktionen baseras på en robust ram av fyrkantsprofiler i stål som inrymmer både mekaniska och elektriska delsystem. Den centrala funktionen, att omvandla rotation till linjär rörelse, uppnås genom en scotch yoke-mekanism som drivs av en trefas asynkronmotor via en remväxel. För att möjliggöra testning av olika dämpar- typer har systemet utrustats med en specialdesignad rotationsskiva som medger justering av slaglängden mellan 5 och 50 mm. Säkerheten har varit en prioriterad aspekt i arbetet, vilket har resulterat i en helt inkapslad testmiljö med integrerade nödstopp och gränslägesbrytare som uppfyller kraven i gällande maskindirektiv. Mät- och styrsystemet är uppbyggt kring en National Instruments DAQ-enhet och omfattar sensorer för dämparkraft, position och temperatur. Genom ett egenutveck- lat användargränssnitt i LabVIEW kan operatören reglera testriggens hastighet och logga mätdata i realtid, vilket ger CFS värdefull information om dämparnas egen- skaper och beteende i både kompressions- och returfasen. Resultaten visar att samtliga mekaniska krav har uppfyllts. Testriggen hanterar dämparkrafter på upp till 1 880 N utan oönskad deformation och uppnår den krav- ställda hastigheten 0.263 m/s vid 25 mm slaglängd. Projektet har resulterat i en mekaniskt fungerande stötdämpardynamometer som ger CFS ett värdefullt verktyg för att optimera bilens väghållning. Implementeringen av testriggen skapar därmed goda förutsättningar för förbättrad fordonsdynamik och ökad konkurrenskraft i framtida tävlingar.
Sustaining Change Through People The Role of Super Users as Change Ambassadors
(2026) Bergman, Ellen; Rapp, Marcus
Organisations are increasingly operating in settings characterised by continuous and complex change. While many change initiatives succeed in implementation, fewer manage to sustain new ways of working once formal change initiatives end. This thesis explores how super users function as change ambassadors and how their role can support the long-term sustainment of organisational change. The study adopts a qualitative case study approach within a large organisational change programme. Data were collected through semi-structured interviews with super users and managerial roles involved in a change programme, focusing on multinational system implementation. The empirical material was analysed thematically and interpreted in relation to established change management theory of organisational change. The findings show that super users played a central role in sustaining change through relational influence rather than formal authority. They acted as a link between change objectives and lived reality, enabling local adoption and stabilisation of new practices. However, their impact was strongly shaped by organisational conditions and their surrounding context. Sustainment of the change often emerged informally, creating dependency on individual commitment and limiting organisational resilience. The study concludes that sustaining change requires viewing super users not as temporary implementation resources, but as part of a long-term organisational asset. It was shown how change is not sustained by systems alone but rather the people and conditions that allowed them to succeed.
Managing Circular Material Choices in Practice Trade-offs, Constraints, and Supply Chain Design Impacts
(2026) Civic, Damir; Lindström, Tobias
Despite growing regulatory pressure and corporate sustainability commitments, circular material adoption in industry remains constrained by operational realities that existing research rarely examines in depth. The transition to a circular economy requires firms to substitute virgin materials with recycled, bio-based, or locally sourced alternatives, yet this transition is not merely a technical or environmental decision. It is a constrained organizational process embedded within existing supply chain structures, cost pressures, and operational requirements. The research investigates how businesses make circular material selection decisions, what trade-offs emerge in the process, and how these decisions influence supply chain design. Using a qualitative, exploratory research design, semi-structured interviews were conducted with professionals from eleven organizations across diverse industrial sectors, including automotive, steel, MedTech, defense, fashion, and energy. Data were analyzed through thematic analysis using an abductive approach, iteratively linking empirical findings to theoretical frameworks from sustainable supply chain management, circular economy theory, decision-making theory, and the resource-based view. The findings demonstrate that circular material selection follows a structured, multi-stage decision process in which technical feasibility, safety, and regulatory compliance function as primary gatekeepers, with sustainability considerations entering the evaluation only after operational thresholds are met. Rather than competing equally with other criteria, environmental objectives are integrated conditionally within an already constrained decision space. Significant trade-offs emerge between circularity and cost efficiency, customer requirements, performance reliability, and supply chain risk, managed through cross functional collaboration, pilot-based implementation, and supplier co-development. Material choices were further found to carry substantial downstream consequences for supply chain structure, driving shifts in supplier networks, reverse logistics integration, geographic sourcing, and traceability requirements. Taken together, these results reframe circular material selection not as a sustainability decision constrained by operations, but as a fundamentally operational and supply chain design decision within which sustainability must find its place.
Impact of the EU Right to Repair Directive on Independent Repairers A case study on the impact of the EU Right to Repair Directive on operations strategy for independent repairers
(2026) Gundahl Larsson, Klara; Sternhufvud, Matilda
This thesis studies how the EU Right to Repair directive affects independent repairers, with a focus on the implementation of operations strategy. The background is the increasing amount of e-waste and the need to move from a linear to a circular economy. To achieve this, repairing and reusing products plays a crucial role. The study consists of a qualitative case study of a Swedish independent repairer. Data collection includes interviews with employees at the case company, as well as external businesses and stakeholders. It is further based on an observation, a workshop, and a literature review. An abductive approach has been applied to enable an iterative analysis between theory and empirical data. The results show that the Right to Repair directive creates both opportunities and challenges for independent repairers. Opportunities are mainly identified as improved access to spare parts and information, which can strengthen competitive advantage and increase demand for repair services. Furthermore, it may enable collaboration and increased market visibility. Meanwhile, challenges such as intellectual property rights, product design, and market dynamics remain, in combination with dependency on original equipment manufacturers. Administrative burdens and uncertainty in inflow remain key challenges. Furthermore, the study highlights that independent repairers will need to adapt their operations strategies to handle increased complexity, variability in inflow, and changes in customer behaviour. Strategic implementations include adapting operations by closely monitoring manufacturers and market developments, as well as offering differentiated service offerings. The breadth of the business should be reassessed to ensure a clear focus, transparency, and alignment with core values. Selective automation should be tested on a small scale to manage increasing demand efficiently. Overall, the directive is unlikely to fundamentally transform the market on its own but rather reinforce existing trends while gradually reshaping competitive dynamics.