Physics

Title of thesis: Modeling and Control System Design of a Cascade Vapor Compression System
Abstract: This thesis investigates the modeling, simulation, and analysis of a cascade vapor compression system designed for aerospace thermal management, delivering a 25 kW cooling capacity. Control design focuses on maintaining a liquid coolant at 20 °C, ensuring 5 °C superheat at the evaporator outlets, and an intermediate temperature optimized at the geometric mean of the low-stage evaporator and high-stage condenser to enhance system efficiency. PI controllers are incorporated to regulate performance under varying operating conditions. A MATLAB Simscape model was developed using R134a for the low stage and R1233zd(E) for the high stage, enabling performance evaluation across a range of ambient temperatures and heat loads. Simulations demonstrate robust operation at high ambient conditions, maintaining stable superheat and coolant temperatures. However, at lower temperatures, the system exhibits oscillations and two-phase region entry, indicating limitations in colder regimes. The high-stage compressor’s control of the intermediate temperature contributes to improved efficiency, although slower dynamics suggest further tuning is needed. These findings confirm the system’s suitability for aerospace applications, particularly under high-temperature conditions, while highlighting the need for advanced control strategies and further investigation of low-temperature performance to enhance overall reliability and efficiency. 
Examiner: Magnus Karlsteen Supervisor: Magnus Karlsteen Industrial Supervisor: Olof Hannius Opponent: Quentin Tristan Moulet
Location of presentation:&nbsp;<a rel="noopener" href="https://maps.chalmers.se/#24d8b7be-1f59-4388-be28-a07861b429b2" target="_blank" title="Chalmers maps" data-anchor="#24d8b7be-1f59-4388-be28-a07861b429b2">PJ-salen</a>

Title of thesis: Integration of Force Sensors in Cross-Country Ski Bindings and Concept Development for Multi-Sport Measurement Platforms
Abstract: Accurate force measurement is an essential component in sports science, providing valuable insights into biomechanics, performance, technique, and equipment interaction. Skisens, a Swedish sports technology company, pioneered the introduction of force measurement in cross-country skiing, through instrumented ski poles. Building on this foundation, the present thesis explores the extension of Skisens technology to other contexts. The main focus was the development and validation of a prototype ski binding equipped with integrated force sensors. Several design iterations were produced using CAD tools and 3D printing with advanced polymers, and were validated against force plates. Data processing, filtering, and detection of push-off cycles were performed in Python. The results demonstrated a strong correlation (averaging 90 percent) between the force measurement in the binding prototype and the reference force plates. Propulsive phases were consistently detected, and key biomechanical variables such as impulse, average force and power output were calculated. &nbsp;In addition to the ski binding prototype, two conceptual devices were explored: a modular force plate for dynamic sports such as athletics and strength training, and an inline traction force sensor for gym applications. Both devices were tested in a gym context, and promising results were obtained for key movement values, validated through high-speed video tracking. &nbsp;This thesis highlights both the potential and the current limitations of integrating force sensors directly into sports equipment. Although prototypes remain fragile and are not yet ready for use in the field, the concepts show great potential for providing athletes and coaches with decisive information and real-time feedback on various sports equipment. 
Examiner: Magnus Karlsteen Supervisor: Magnus Karlsteen Opponent: Casper Jarhult 
Location of presentation:&nbsp;<a rel="noopener" href="https://maps.chalmers.se/#24d8b7be-1f59-4388-be28-a07861b429b2" target="_blank" title="Chalmers maps" data-anchor="#24d8b7be-1f59-4388-be28-a07861b429b2">PJ-salen</a>

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Presentation of master thesis

Master thesis presentations at Physics

September 15, 2025

11:00- 12:00 Casper Jarhult, MPCAS

September 22, 2025

09:00- 10:00 Quentin Moulet, MPAEM