http://hdl.handle.net/2268.2/19383 Sun, 26 Jul 2026 21:00:45 GMT 2026-07-26T21:00:45Z http://hdl.handle.net/2268.2/26178 Title: Master thesis : Simulation and design of the hysteretic hybrid control applied to the LLC resonant power converter Abstract: The DC/DC power converter topology of the resonant type LLC is studied and designed to power the discharge of a Hall Effect Thruster for satellite propulsion stage. The design is adapted to space environment with fully analogical circuit composed of radiation-proof components. The regulation is implemented following the Hysteretic Hybrid Control scheme (HHC), simplifying the compensator design. Control-to-output transfer function shaping is done through the perturbator injection method with a simulated Frequency Response Analyzer. Sun, 28 Jun 2026 22:00:00 GMT http://hdl.handle.net/2268.2/26178 2026-06-28T22:00:00Z http://hdl.handle.net/2268.2/26109 Title: Master thesis : Development of a dynamic calibration solution for pressure sensors Abstract: Dynamic calibration of pressure transducers is an ongoing research topic and aims at correcting non-ideal responses measured during a dynamic pressure transient. Numerous approaches have been developed in the literature, each one corresponding to a specific application. The thesis starts with an overview of some of the most popular developed methods. Then, two methods are presented in this document: the explosion of a balloon and the explosion of a firecracker. The first one is capable of generating a pressure transient in the 200-microsecond range, while the second can produce a pressure variation in the tens of microseconds. The thesis closes with a discussion on obtaining the frequency response of the tested sensors using the two methods, reaching the kHz range. In the absence of good references (theoretical or practical), the two presented methods are rather proof of concepts, as further work is required to completely evaluate their suitability. Sun, 28 Jun 2026 22:00:00 GMT http://hdl.handle.net/2268.2/26109 2026-06-28T22:00:00Z http://hdl.handle.net/2268.2/26107 Title: Master thesis : Power converter harmonics reduction with an AI controller Abstract: This master’s thesis, carried out as part of an internship at CE+T Power, aims to develop an AI controller and to assess to what extent it can effectively reduce the harmonic distortion produced by a power converter connected to the main electrical grid, a challenging task at the intersection of signal processing, control theory, power electronics and artificial intelligence… Sun, 28 Jun 2026 22:00:00 GMT http://hdl.handle.net/2268.2/26107 2026-06-28T22:00:00Z http://hdl.handle.net/2268.2/26105 Title: Master thesis : Design and Development of a Resin-Switching System for Multi-Material MSLA 3D Printing Abstract: Multi-material fabrication through vat photopolymerisation requires the ability to switch between different photosensitive resins within a single print cycle, a capability that re- mains unavailable in commercial Masked Stereolithography Apparatus (MSLA) printers. This work addresses that gap by designing, developing, and characterising a complete resin-switching subsystem integrated into the custom-built MSLA printer of the Microsys laboratory at the University of Liège. The proposed solution adopts a single-vat architecture with dynamic fluid delivery. Peri- staltic pumps are used to fill and evacuate the resin in the vat through dedicated inlet and outlet apertures, while an isopropyl alcohol (IPA) sprinkler system, mounted directly on the vat, performs the intermediate cleaning of both the vat and the printed part be- tween successive resin changes. The mechanical system is composed of a custom resin vat, tubing layout, pinch valves, resin storage tanks, and a splash protection enclosure. The associated electronics consist of a reworked power supply board and a newly designed resin control board, which integrates motor drivers, analogue sensing circuitry, and an STM32 microcontroller. Experimental validation was conducted across three principal capabilities. The resin pumping step achieves a removal efficiency of approximately 98% for resins of viscosities up to 350 cP, provided that spontaneous film dewetting is achieved on the non Fluorinated Ethylene Propylene (nFEP) surface. The vat cleaning step, assessed by spectrometric measurement of residual contamination, demonstrates that a single 25 second IPA spray- ing cycle reduces cross-contamination to 0.65% when starting from a fully filled vat of 350 cP resin. Part cleaning, evaluated through optical microscopy and profilometer mea- surements on microfluidic test structures, shows that two consecutive 25 second spraying cycles deliver a cleaning performance comparable to that of a stand-alone four-minute ultrasonic bath. The results confirm that the system constitutes a viable proof-of-concept for autonomous multi-material MSLA printing. Several directions for future improvement are identified, including motorised vat tilting, additional inlet apertures, and the integration of film- directed cleaning nozzles to extend performance to higher-viscosity resins and deeper geometrical features. Sun, 28 Jun 2026 22:00:00 GMT http://hdl.handle.net/2268.2/26105 2026-06-28T22:00:00Z