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Senast publicerade

Ride Height Control System for a Foiling Sailing Dinghy
(2026) Ghasemi, Edwin; Gustafsson, Axel; Kristensson, Jack; Peleg, Tom; Rydz Wullens, Samuel; Åkerskog, Marcus
This thesis aims to present the development of a mechatronic ride height control system for the Chalmers Formula Sailing moth dinghy Saga. Subsequently, the objective has been to create a system capable of riding at a set height above sea level in normal conditions. Energy efficiency within the maritime industry has been a driving force for innovation in the field. Hydrofoiling is an old technology that has gained traction as it has been shown to be an effective alternative. However, as the maritime environment is unpredictable, challenges arise with the construction of a stable, reliable control system. With hydrofoiling not being a widely adopted technology, limited research has been made in mechatronic control systems for foiling watercraft. This thesis contributes to that research by sourcing components, designing and constructing parts, coding a regulator and finally building and testing the control system. The result showed data in which the regulator responded as expected based on the estimated height generated from the sensors. It was concluded that the physical system was sufficient, but further calibration of the controller was needed to reach the objective. It is believed that the project is a good platform for future work for the Chalmers Formula Sailing team.
Användarcentrerad gränssnittsdesign för 3D-skanningsbaserad sadelutprovningsprocess
(2026) Grundström, Erik; Svärd, Linnea
Saddle fitting relies on experience-based assessments and practical knowledge. Emerging technologies such as 3D scanning create opportunities to complement these assessments with more detailed information about the horse’s back and the fit of the saddle. Measurement data can support and further inform practical assessments. The aim of this bachelor’s thesis was to investigate how a user-centered interface could be designed to support the management and visualization of 3D scans and measurement data within the saddle-fitting process. The project was conducted with SaddleScanner and included interviews with saddle fitters and representatives from riding schools. Based on the identified needs, a mobile interface was developed in Figma and evaluated and refined through two rounds of formative user testing. The user tests showed that the participants could understand and use several of the interface’s core functions. However, the matching process, which constituted the interface’s main function, was perceived as difficult to initiate and complete because the structure of the interface did not fully align with the users’ mental models. Since the workflow was new, the participants lacked an established mental model to rely on, making it difficult to understand which steps to take and why they had to be performed in the given order. The project resulted in an interface proposal in which functions and information were structured according to the users’ mental models. Clear guidance, continuous feedback, and a logical starting point were identified as central factors in making the interface intuitive and efficient to use.
Mapping Dagab´s End-to-End Forecasting Process: Cross-Functional Misalignments in End-to-End Forecasting and Procurement
(2026) Nagy Némedi, Torsten; Mendez Ståhl
This master thesis is examines Dagab´s current end-to-end forecast process, from how the customers demand signals becomes purchasing decisions. The study focuses on how the information for customer demand is gathered, interpreted, and handovers between different function, but also how the bottlenecks and inefficiencies in the coordination is affecting the process efficiency and trustworthiness. The study is a qualitative case study of Dagab External Affairs, with empirical data from interviews, observations and internal documents. The results shows that the process can be described as a sequential chain where customer input is transformed into forecast, system registrations and in the end, procurement decisions, and in the practice, it is in practice less linear, relying heavily on manual adjustments, individual experience and informal communication. The foremost challenges are about the unclear ownership in the process, lacking information quality, semantic differences in the functions, and goals differences. This type of problem is creating bottlenecks, reactive work, increased risk for delays or shortages, especially for new articles, campaigns, and menu related launches. The study shows that recurrent operative disturbances can affect the customers trust for Dagab, foremost when there occurs a distinction between customers’ expectations and the actual delivery capability. The conclusion for the study is that the improvements should be focusing on clearer end-to-end ownership, common definitions, better handovers, defined control checkpoints and more structured follow-ups. Thus, should the forecasting be understood as a question of cross-functional process design rather than just the forecasting precision.
Concept Development of Unmanned Ground Vehicles in Dual-Use Operations
(2026) Larsson, Sofia; Tinghall , Julia
Unmanned Ground Vehicles (UGVs) are becoming increasingly relevant in military and dual-use operations due to their ability to reduce risks for personnel and support missions in high-risk environments. Recent conflicts have demonstrated the growing need for resilient autonomous and remotely operated systems capable of supporting casualty evacuation, medical evacuation, and logistics close to the frontline. Despite rapid technological development, there remains a need for structured methods to support early-stage concept development of such systems. This thesis investigates how Systems Engineering (SE) methods can support early product development and conceptual system-level design of UGVs for dual-use and near-front operations. The study aims to identify stakeholder and user needs, define relevant operational scenarios, and develop concept proposals adapted for CasEvac, MedEvac, and logistics missions. The project was conducted through theory research, market and competitor analyses, and semi-structured interviews with stakeholders, users, and experts. A Systems Engineering approach was applied using Concept of Operations (ConOps) and Model-Based Systems Engineering (MBSE) methods to structure operational and system-level analysis. Identified requirements and operational scenarios were translated into functional system models and visualized through CAD-based concept development. The results show that modularity, adaptability, compact dimensions, and safe patient transport are key design considerations for UGVs operating in high-risk environments. Three mission-oriented concept proposals were developed and evaluated based on identified operational needs. Furthermore, the study demonstrates that Systems Engineering methods support traceability, communication, and structured decision-making during early product development. The thesis contributes with a conceptual framework and design approach for future development of resilient dual-use UGVs in evacuation and logistics operations
Packaging of a state-of-the-art v-band active cold load and RF switch
(2026) Yngström, Gustav
Microwave radiometers must be regularly calibrated to maintain high measurement accuracy. Conventional calibration systems often use cold sky and onboard reference views. These different views are typically selected using a rotating mirror. An Active Cold Load (ACL) can provide an electronically controlled cold reference directly in the receiver chain, while a Radio Frequency (RF) switch routes the receiver between the measurement and calibration reference paths. This thesis presents the packaging and integration of two V-band Silicon-Germanium (SiGe) Monolithic Microwave Integrated Circuits (MMICs), an ACL and an RF switch. The thesis includes the design of a WR-15 waveguide-to-planar transition, bondwire interconnects between MMIC and transition, split-block design and biasing boards. Specifically an E-plane probe on alumina was developed and designed for the SiGe MMIC interface using a Coplanar Waveguide with Ground (CPWG) section and a multi-stage impedance transformer optimized in ANSYS High Frequency Structure Simulator (HFSS). The transition achieved a simulated return loss of S11 < −26.9 dB and S21 > −0.3 dB across the targeted frequency band 50 − 60 GHz. In addition, a backto- back structure showed S11 < −17.8 dB and S21 > −0.6 dB. Furthermore, a sensitivity analysis was performed, demonstrating that the design remained below S11 < −20 dB for all investigated variations. The design was evaluated through fullwave electromagnetic (EM) simulations, while the planned scattering parameter and noise temperature measurement procedures are described for future characterization. The simulation results suggest that the proposed packaging design is suitable to realize compact V-band ACL and RF switch modules for radiometer calibration.