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Senast publicerade

Inbyggt styrsystem för elektrisk genomströmningsvärmare - Built-in control system for electric flow heater
(2026) Millberg, Tony; Boman, Mikael
Vyse tech AB utvecklar en produkt som ska minska vatten- och energiförbrukningen hos kranar. Istället för en centraliserad värmepanna värmer produkten vattnet precis innan det når kranen. I denna rapport redovisas utvecklingsprocessen för styrsystemet till en vattenvärmare samt de resultat som framkommit under examensarbetet. Det har funnits två mål med examensarbetet. Det första har varit att utveckla och implementera regleringen av temperaturen i värmeelementet som ska finnas i produkten. Det andra har varit att undersöka och eventuellt eliminera en temperaturdipp som kan ske i början av vissa spolningar av kranen. För att uppnå dessa mål har en iterativ process utförts där tester och resultat kontinuerligt utvecklats. Resultatet av examensarbetet är att den framtagna regulatorn snabbt värmer upp vattnet och har eliminerat översväng i det mest förekommande driftsceneriet. Temperaturdippen är antingen kraftigt reducerad eller helt eliminerad beroende på hur produkten är installerad. Vyse tech AB is developing a product that will reduce water and energy consumption in faucets. Instead of a centralized boiler, the product heats the water just before it reaches the faucet. This report describes the development process for the control system for a water heater and the results that emerged during the degree project. There have been two goals with the degree project. The first has been to develop and implement the control system of the temperature in the heating element that will be in the product. The second has been to investigate and possibly eliminate a temperature dip that may occur at the start of certain flushes of the faucet. To achieve these goals, an iterative process has been carried out where tests and results have been continuously developed. The result of the degree project is that the developed control system quickly heats the water and has eliminated overshoot in the most common operating scenario. The temperature dip is either greatly reduced or completely eliminated depending on how the product is installed.
Dynamic Simulation of Lignin Composition Transients During Wood Species Switching at Södra Cell Mönsterås
(2026) Gillet, Francis
Adaptive Lateral Control of Autonomous Trucks
(2026) Nair, Anirudh Vinod
Autonomous heavy vehicle control systems depend on a suite of parameters, both vehicular and environmental, and their performance is directly related to these parameter values. These parameters often include variables such as the total mass of the loaded vehicle, lateral and longitudinal tire cornering coefficients, wheelbase geometry, load distribution, etc. In theory, these parameters are often considered constant and known. However, in practice, this might not always be the case, especially in dynamic operating environments of a quarry or mine. Therefore, to ensure robust and reliable performance, the controller must be adaptive, updating itself online to continue operating efficiently. This thesis focuses on the investigation, development, and implementation of different types of adaptive lateral controllers for autonomous haulage trucks, whose parameters initially deviate from the true value and are subject to change during operation. The study focuses on evaluating both direct and indirect approaches to adaptive control. The direct adaptive controller uses a Lyapunov-based approach towards adaptation, meanwhile the indirect controller uses Kalman filter-based estimation methods to estimate unknown system parameters. Overall, the findings suggest that the indirect adaptive control strategies are more suitable for autonomous haulage applications. The integration of Kalman filterbased parameter estimation with model based controllers like LQR resulted in consistent performance and robustness, and better handling of system uncertainties compared to direct adaptive approaches.
Development and Optimization of Underwater Exhaust Outlets for Sailing Yachts
(2026) Fridh, Henrik; Hyltén, Lukas
Although sailing yachts primarily rely on wind for propulsion, engines are used for propulsion in unfavorable sailing conditions and maneuvering in the marina. On sailing yachts, exhaust gases are typically expelled through outlets positioned above the waterline. This can contribute to noise, vibration, odor and increased piping requirements, which may negatively affect onboard comfort, weight and space utilization. One solution to reduce these issues is to relocate the exhaust outlet underwater and closer to the engine. While underwater exhaust outlets are commonly used on motor yachts, their application on sailing yachts remains largely unexplored. This thesis investigates the development and optimization of an underwater exhaust outlet for sailing yachts using a structured product development approach supported by computational fluid dynamics. A representative 33 m sailing yacht hull was modeled and in total 30 exhaust outlet concepts were generated and evaluated with over 60 CFD simulations in OpenFOAM. The final concept, called the Quarter Bell-Mouth, consists of a tapered underwater outlet combined with an interceptor positioned near the outlet. The interceptor creates a low-pressure region that helps reduce back pressure and promotes a steadier exhaust gas flow. Simulation results indicate that the concept can expel exhaust gases underwater without negatively affecting the propeller or rudders while maintaining acceptable back pressure between approximately 8 and 13 knots at heel angles of ±5◦. However, oscillations at lower speeds indicate that a bypass exhaust is required below 8 knots. The results of this thesis show that underwater exhaust outlets are a promising design alternative for sailing yachts, with potential benefits in comfort, weight and space utilization. Future work should include validation on additional hulls, material and manufacturing studies and sea trials with a physical prototype.
Design av en kundanpassad display i wellpapp - från koncept till konstruktion
(2026) Nisén, Ylva; Yu, Emily
The purpose of this project is to explore the possibilities and limitations of corrugated cardboard and to examine how the material can be used to create an attractive display that showcases a brand. The aim is to develop and produce a display that is easy to assemble, easy to transport, and through its design promotes the hypothetical client Red Bull, a brand heavily associated with strength, endurance, and extreme sports. A preliminary study was undertaken to determine how corrugated cardboard displays are used today, how they are structurally built, and what material properties need to be considered. This was done through literature studies, observational studies, and unstructured interviews. An early ideation using brainwriting, brainstorming, sketches, and the KJ Method was conducted to establish a collaborative vision. Findings revealed that corrugated cardboard is a beneficial alternative from an environmental standpoint, as it has a high recycling rate, is lightweight, and can be designed compactly for transportation. However, corrugated fiberboard can be either rigid or bendable depending on the direction of its wave pattern. Compromises in the design are therefore often necessary to make the product more structurally stable and user-friendly. Computer-aided design, prototypes, and sketches were central to the process, enabling a clearer understanding of how two-dimensional drawings translate into physical products. The final product, a Formula 1- and Soapbox Race-inspired Point-of-Sale display, was fabricated to validate these findings. The result reveals that it is possible to design an attractive corrugated cardboard display that, through a strong visual expression, showcases and strengthens a brand’s identity.