TY - GEN A1 - Amer, Sherif A1 - Zentgraf, Peter A1 - Ober, Eduard T1 - Damping of Sloshing in a Moving Container T2 - Tagungsband | AALE 2026 N2 - Liquid sloshing limits speed, accuracy, and reliability of pick-and-place systems, laboratory automation, and mobile robots that transport open containers. Motivated by industrial anti-sloshing motion functions [1], this work presents a compact testbed and a simple open-loop strategy that reproduces the effect on a low-cost setup. A camera rigidly mounted to the carriage moves with the tank and records the free surface, enabling extraction of the visible surface angle per frame. The first two sloshing frequencies and the dominant-mode damping are identified from experiments. The dominant mode is then modeled as a lightly damped second-order system excited by the carriage motion. Two command-side strategies are compared: Zero-Vibration-Derivative (ZVD) input shaping and an inverse transfer function prefilter. The ZVD method delivers near-zero residual slosh after the end of the move with a predictable, fixed time extension equal to the damped period. The inverse function prefilter also suppresses the sloshing with the advantage of being a simpler approach. Both approaches are open-loop and need only the identified frequency and damping for a given fill level of the container. A single-mode simulation based on the identified model predicts the measured behaviour successfully, and both suppression strategies are verified in simulation and experiments. KW - Sloshing KW - input shaping KW - system identification KW - feedforward control KW - vibration suppression Y1 - 2026 U6 - https://doi.org/10.33968/2026.01 SP - 191 EP - 200 ER - TY - GEN A1 - Krettek, Martin A1 - Hagl, Rainer A1 - Braml, Thomas T1 - Advancing Bridge Weigh-In-Motion with A Novel Optoelectronic Strain Sensor T2 - IABSE Symposium Tokyo 2025 Report N2 - Bridge Weigh-In-Motion (B-WIM) is a method of transforming a bridge structure into an instrument for traffic data collection. This is mainly achieved by a specific arrangement of sensors mounted underneath the bridge, with strain sensors being the most commonly used type. The acquisition and processing of the strain data allows the determination of the actual traffic loads, thus providing valuable information for road infrastructure management. This paper presents a novel B-WIM strain sensor based on optoelectronic position measurement technology. The sensor outperforms the conventionally used strain transducers in terms of their reported resolution capability. The resulting advantages are demonstrated by evaluating data collected from a stiff in-service bridge structure. Using the digital interface of the novel sensor, the paper also proposes a dedicated B-WIM system design. The design aims to simplify the implementation of the B-WIM method in practice. Y1 - 2026 U6 - https://doi.org/10.2749/tokyo.2025.1676 SP - 1676 EP - 1683 PB - International Association for Bridge and Structural Engineering CY - Zürich ER - TY - GEN A1 - Effenberger, Thomas A1 - Stubenrauch, Franz A1 - Dechant, Eduard A1 - Heldwein, Marcelo Lobo T1 - Resonances and Oscillations in DC Grids T2 - PCIM Conference 2025 N2 - A trend has been emerging in the field of industrial automation: direct current (DC) is making a comeback. This is due to the desire for greater energy efficiency and flexible, intelligent energy distribution. However, DC can still exhibit alternating current (AC) components from pulsating loads on an industrial grid, which may excite resonances. This work derives an equivalent circuit model for the grid and verifies it using a motor test bench. Design considerations for the DC link capacitance are presented to enable the integration into a decentralized drive. Y1 - 2026 U6 - https://doi.org/10.30420/566541322 ER - TY - GEN A1 - Helbig, Michael A1 - Seliger, Norbert T1 - Combinatorics of Inductance States in Reconfigurable Air Coils T2 - Proceedings 2nd International Conference on Recent Advances in Mathematics and Informatics (ICRAMI'25) N2 - We propose a group theory based mathematical model for unambiguous inductance states of a reconfigurable air coil inductor utilizing elastic snapping of wire segments. Vertical (axial) and horizontal winding symmetries under group actions reveal distinguishable tuning regions and individual variation states therein. The model is applied to coils of prismatic (cylinder like) and truncated pyramidal (conical like) shape with edges forming a regular polygon as basis, and verified by numerical magnet field simulation. KW - Inductance KW - Magnetic devices KW - Matrices KW - Group theory KW - Combinatorial mathematics Y1 - 2025 SN - 978-9909-00-770-9 ER - TY - JOUR A1 - Herz, Jonas A1 - Muscat, Dirk A1 - Strübbe, Nicole T1 - The Influence of Fillers on the Reinforcement Capabilities of Polypropylene Based Mono-Material and Core-Shell Fibers in Concrete, a Comparison JF - Polymers N2 - Noncorrosive concrete reinforcement, such as polymer fibers, is needed to overcome the current issues caused by corroded steel reinforcements. Fibers made of polypropylene show a low bonding behavior in concrete. Fillers can help to overcome this issue but often lead to reduced mechanical properties. Core-shell fibers, which split the mechanical properties and the bonding behavior between the core and the shell component, could be a solution. This study investigates mono-material and core-shell fibers produced with calcium carbonate and bentonite fillers and compares their behavior in tensile tests, density measurements, contact angle measurements, topography measurements, single fiber pull-out tests, reflected light microscopy, and thermogravimetric analysis. The fillers caused an increased drawability, resulting in higher mechanical properties. Further, in the core-shell fibers, the calcium carbonate increased the surface roughness, which led to a better anchoring of the fiber in concrete, which was also visible in the deformation during pull-out observed in reflected light microscopy pictures. The thermogravimetric analysis showed a delay in onset of degradation for fibers containing bentonite. KW - fibers KW - extrusion KW - coextrusion KW - polymer drawing KW - polypropylene KW - calcium carbonate KW - bentonite KW - core-shell KW - mono-material KW - concrete Y1 - 2025 U6 - https://doi.org/10.3390/polym17131781 VL - 17 IS - 13 PB - MDPI CY - Basel ER - TY - CHAP A1 - Yilmaz, Tugce A1 - Mari, Jorge A1 - Asam, Johann A1 - Kirner, Michael A1 - List, Andreas A1 - Fantauzzo, Lucia A1 - Seliger, Norbert T1 - AC Cycling Testing of SiC MOSFET Power Module T2 - Proccedings International exhibition and conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM 2025) N2 - This paper details the development of an accelerated AC cycling test bench for evaluating the aging mechanisms of SiC MOSFET power modules. Contrary to classical HTGS and DGS which only exercise gate source stresses the AC Cycler switched under high voltage and current. Operating for about 235 hours, the system maintained stable thermal conditions thanks to an integrated cooling system. Key precursors of aging, such as increases in threshold voltage and on-state resistance were identified using static characterization curve tracer before and after the test. Gate charge and Vdson were also measured on-line with specially developed gate drivers. KW - power module KW - SiC KW - power cycling testing KW - MOSFET Y1 - 2025 SN - 978-3-8007-6541-6 U6 - https://doi.org/10.30420/566541341 SP - 2562 EP - 2567 PB - VDE VERLAG GMBH CY - Berlin ER - TY - CHAP A1 - Seliger, Norbert T1 - Introducing Environmental Sustainability in an RF and EMC Lab Course Utilizing Reusable, Recyclable and Biodegradable Circuits T2 - Proceedings IEEE educon 2025 N2 - We propose to introduce environmental sustainability in a radio frequency (RF) and electromagnetic compatibility (EMC) laboratory course for an electrical engineering bachelor’s program utilizing reusable, easily recyclable and ecologically harmless (biodegradable) circuits. Our concept is based on the replacement of state-of-the-art printed circuit boards by substrates with mechanically structured adhesive Cu and Zinc films. Furthermore, organic based circuit carriers can be substituted by biodegradable paper substrates. As an example for the RF lab, we discuss the design, simulation and experimental characterization of a microwave low-pass filter with 1.2GHz cut-off frequency. Secondly, for an EMC lab we suggest a prototype for power integrity (PI) studies based on the current imbalance method for reducing common mode radiated emission. As a novel feature during the lab course, the instructor in addition gives a lecture highlighting the electronic waste challenge, which is accompanied by group discussions on sustainability and recycling. As a final lab course task students are asked to disassemble the boards or prepare them for reuse, followed by material sorting and submission to recycling institutions. KW - Microstrip Filters KW - Electromagnetic Compatibility KW - Printed Circuits KW - Electronics Engineering Education KW - Electromagnetic Engineering Education KW - Biodegradable Electronics Y1 - 2025 U6 - https://doi.org/10.1109/EDUCON62633.2025.11016365 PB - IEEE ER - TY - CHAP A1 - Seliger, Norbert A1 - Leirich, Nico T1 - Reconfigurable single-layer air coil inductor with bistable compliant windings T2 - Proceedings EPE 25 N2 - We present an air coil with bistable compliant single layer windings. Due to stable elastic snapping deformation of wire segments, the self-inductance of the air coil can be precisely varied in multiple steps. A numerical and analytical design methodology is proposed and successfully validated by magneto-quasi-static field simulations and experiments on prototypes. KW - Reconfigurable resonant network KW - Passive component KW - Magnetic device KW - Winding topology KW - S- Parameters Y1 - 2025 U6 - https://doi.org/10.34746/epe2025-0012 PB - EPE Association ER - TY - CHAP A1 - Püschel, Maximilian A1 - Seliger, Norbert T1 - Multiple-Frequency Three Coil Inductive Power Transmission with Non-Linear Relay Resonator T2 - Proceedings Southeastcon 2025 N2 - We propose near-field inductive power transfer with three coils in the frequency range of a few MHz. The relay coil is part of a non-linear resonator having a diode connected in parallel to the resonant capacitor. We achieve power transfer at multiple frequencies which can be tuned by the input power level and mutual coupling between the coils. Higher harmonic generation is found dominant at lower input power, whereas subharmonic generation (period doubling and period quadrupling) is observed at high levels. Power transfer at subharmonics reveals robustness against level perturbations due to pronounced amplitude hysteresis effect. A circuit simulation based on standard non-linear diode SPICE models confirms the experimental results which are obtained on a demonstration prototype. KW - wireless power transfer KW - inductive power transmission KW - nonlinear circuits Y1 - 2025 SN - 979-8-3315-0484-7 U6 - https://doi.org/10.1109/SoutheastCon56624.2025.10971670 SN - 1558-058X SP - 34 EP - 39 PB - IEEE ER - TY - GEN A1 - Herz, Jonas A1 - Hefenbrock, Sophia A1 - Lorenz, Katharina A1 - Muscat, Dirk A1 - Strübbe, Nicole ED - Ediciones Uniandes, T1 - Polyketone-Polypropylene Core-Shell Fibers for Concrete Reinforcement T2 - Proceedings of the 39th International Conference of the Polymer Processing Society (PPS-39) N2 - Corrosion of the commonly used steel reinforcements weakens the structural strength of concrete. To oppose this issue, concrete reinforcements in the form of polymer fibers are investigated. These polymer fibers need a good bonding ability to concrete and good mechanical properties. This study investigates core-shell fibers produced from polyketone and polypropylene mixed with a compatibilizer. The core-shell fibers were produced by coextrusion and drawing. The fibers were analyzed by tensile tests, a single fiber pull-out test, contact angle measurements, scanning electron microscopy and thermogravimetric analysis. KW - Concrete Reinforcement KW - Core-Shell Fiber KW - Polyketone KW - Polypropylene Y1 - 2024 U6 - https://doi.org/10.51573/Andes.PPS39.GS.FF.1 SP - 167 EP - 177 ER - TY - GEN A1 - Krey, Adrian A1 - Zenz, Vitus A1 - Widera, Karolin A1 - List, Manuela A1 - Muscat, Dirk A1 - Strübbe, Nicole ED - Ediciones Uniandes, T1 - Reactive Extrusion of Lignocellulosic Biomass to Produce Biopolymer Monomers using High-Energy Radiation and Catalytic Acids T2 - Proceedings of the 39th International Conference of the Polymer Processing Society (PPS-39) N2 - The increasing prevalence of bio-based and biodegradable plastics as an alternative to traditional plastics derived from crude oil is a noteworthy trend. Polybutylene succinate (PBS), a plastic produced from succinic acid, is among the promising materials for the future. However, the production of bio-based succinic acid through biotechnical processes in controlled environments presents challenges. This process leads to increased costs and is currently not economically competitive compared to crude oil-based succinic acid production. In addition to succinic acid, levulinic acid is another monomer produced in the same process. A novel approach to the digestion of biomass has been developed to address the issue of biotechnological production of bio-based platform chemicals. This innovative process employs microwave radiation, pressure, and temperature to convert wood residues into succinic acid and levulinic acid. Various catalyst concentrations and biomass ratios were tested in a batch process, with high-pressure liquid chromatography (HPLC) and liquid chromatography–mass spectrometry (LC/MS) analyses revealing the formation of succinic acid, levulinic acid, formic acid, and 2 oxoglutaric acid. The results demonstrate that microwaves combined with a metal salt catalyst can be used to produce platform chemicals from lignocellulosic biomass. To further advance the continuous production of PBS, a twin-screw extruder was modified and adapted after the successful results obtained from the batch processes. This setup enables additional experiments to evaluate the transferability of batch process results to continuous reactions, facilitating the scale-up and economic viability of the overall PBS production process in the future. KW - Succinic Acid KW - Levulinic Acid KW - Biopolymer KW - Microwave KW - Wood Y1 - 2024 U6 - https://doi.org/https://doi.org/10.51573/Andes.PPS39.SS.BBB.6 SP - 329 EP - 337 ER - TY - JOUR A1 - Herz, Jonas A1 - Schusser, Verena A1 - Muscat, Dirk A1 - Strübbe, Nicole T1 - Cold-Drawn Wood-Filled Polybutylene Succinate Macro-Fibers as a Reinforcing Material for Concrete JF - Polymers N2 - The corrosive behavior of steel reinforcements causes issues in the concrete industry. To overcome this issue, alternative noncorrosive reinforcements such as polymer fibers could be used. However, as environmental protection becomes more important, sustainability must also be considered in the solution. An alternative to polymers based on raw oil is bio-based polymers. This study investigates the suitability of polymer fibers produced from polybutylene succinate together with cellulose and wood fillers as concrete reinforcements. Different mixtures of polybutylene succinate, cellulose, and wood fillers were created, and fibers were produced using a multiple drawing process. The fibers were tested using tensile tests, a single-fiber pull-out test, contact angle measurements, reflected light microscopy, density measurements, and thermogravimetric analysis. The fillers were shown to decrease the mechanical properties as the particle size and filler amount increased, resulting in a reduction in Young’s modulus and tensile strength of 55% and 70%, respectively, while adhesion to concrete increased with particle size from 0.31 ± 0.02 N/mm2 without filler to 0.90 ± 0.10 N/mm2 for the best-performing material combination. Reflected light microscopy images show changes in the fiber surface before and after pull-out. The fiber density decreased from 1.26 ± 0.05 g/cm3 to 0.91 ± 0.04 g/cm3 with an increasing filler amount and particle size for a compound with 10 weight percent of wood filler 1. The fiber thermal stability decreased slightly with the addition of filler. The greatest effect was a reduction in the temperature to ≈58 °C at 1% weight loss when 10 weight percent of wood was added. This study proves the possibility of using bio-based materials as concrete reinforcements. KW - fibers KW - compounding KW - extrusion KW - multiple drawing KW - polybutylene succinate KW - microcrystalline cellulose KW - wood particles KW - concrete Y1 - 2025 U6 - https://doi.org/https://doi.org/10.3390/polym17030403 VL - 17 IS - 3 PB - MDPI CY - Basel ER - TY - CHAP A1 - Seliger, Norbert A1 - Leirich, Nico T1 - Compliant Mechanism based Planar Inductors for Reconfigurable Magneto-Inductive Wave Devices T2 - 18th International Congress on Artificial Materials for Novel Wave Phenomena - Metamaterials 2024 N2 - A reconfigurable planar inductor based on bistable compliant mechanism is proposed. Flexible snapping of wire elements is used for modification of the loop area and self inductance as well as for the mutual coupling between laterally arranged multiple inductors in a magneto-inductive wave (MIW) device. A mechanical model is presented building the basis for an analytical inductance model. The bistable reconfigurability is demonstrated experimentally and confirmed by numerical simulation results. KW - Magneto-Inductive-Wave Device KW - Reconfigurable Inductor KW - Compliant Mechanism Y1 - 2024 SN - 979-8-3503-7349-3 U6 - https://doi.org/10.1109/Metamaterials62190.2024.10703322 SP - X-243 EP - X-245 PB - IEEE CY - Crete ER - TY - CHAP A1 - Yalamanchili, R. A1 - Schlee, S. A1 - Märkl, M. A1 - King, F. A. T1 - Enhanced Time-Optimal Filter-Based Point-to-Point Trajectory Generation with Vibration Suppression T2 - The 10th International Conference on Mechatronics and Robotics Engineering (ICMRE), Milan, Italy, 2024 KW - Vibration Suppression Y1 - 2024 ER - TY - CHAP A1 - Brunner, Christian A1 - Hagl, Rainer T1 - Tilting Measurement and Compensation in Robotic Joints T2 - The 10th International Conference on Mechatronics and Robotics Engineering (ICMRE), Milan, Italy, 2024 KW - Robotic Joints Y1 - 2024 ER - TY - CHAP A1 - Seliger, Norbert T1 - A Tunable Wire Loop Inductor based on Bistable Compliant Mechanism T2 - 25th International Microwave and Radar Conference (MIKON) N2 - By axially loading of a cylindrical wire we utilize the first order buckling mode to form the shape of a segment of a wire loop inductor. The shape of the deformed wire is expressed in analytical form and provides the basis for a semi-empirical formulation of the loop inductance. Combining several buckling segments and taking advantage of the snap-through behavior of such a segment, the shape of the wire loop in air and hence the loop inductance can be varied mechanically on purpose. The analytical model for the tunable inductance enables a design methodology for bistable compliant inductors. We present two designs of mechanically tuned inductors in the range from 20nH to 50nH. Furthermore the electromagnetic properties of the proposed innovative components are confirmed by method of moments numerical modeling based on quasi-static magnetic fields and by experiment. We finally show that the design process is applicable to regular plane polygonal inductors representing multi-stable compliant stages. KW - tunable inductor KW - bistable compliant mechanism KW - buckling mode KW - loop inductance Y1 - 2024 SN - 978-83-969726-0-6 U6 - https://doi.org/10.23919/MIKON60251.2024.10633977 SP - 209 EP - 214 PB - IEEE, Warsaw University of Technology CY - Wroclaw, Poland ER - TY - CHAP A1 - Seliger, Norbert T1 - Reconfigurable Polygonal Planar Inductor with Bistable Snapping Mechanism T2 - 2024 IEEE Open Conference of Electrical, Electronic and Information Sciences (eStream), Vilnius, Lithuania N2 - A mechanically tunable planar single-turn inductor in air is proposed. The bistable flexible deflection of axially compressed wire segments is used for variation of the loop area of regular polygonal loop inductors. We present analytical expressions for the loop inductance and confirm the theoretical findings by magneto-quasi-static field simulation on exemplary polygonal circuits. KW - Inductance KW - Inductors KW - Design methodology KW - Wires KW - Magnetic Analysis Y1 - 2024 SN - 979-8-3503-5241-2 U6 - https://doi.org/10.1109/eStream61684.2024.10542595 SN - 2690-8506 SP - 1 EP - 6 ER - TY - CHAP A1 - Herz, Jonas A1 - Lorenz, Katharina A1 - Muscat, Dirk A1 - Strübbe, Nicole T1 - Polymeric core-shell and mono-material fibers for concrete reinforcement T2 - AIP Conference Proceedings N2 - A reinforcement of concrete structures is needed because of the low tensile strength of concrete. Corrosion of the usually used steel reinforcments cause issues during time. Therfore, alternative reinforcements produced from non-corosive materials - like polymer fibers - become more interesting. A polymer fiber has to reach high mechanical properties and a good bonding ability to concrete. Both properties can be influenced by the selection of polymer and the used production process. Two polymers, polypropylene and aliphatic polyketone are tested within this study. First mono-material fibers of each material are produced and tested, later the materials are combined in a core-shell fiber. All fibers are produced by standard extrusion or coextrusion and a later drawing process. The mechanical properties are determined by tensile tests. The calculation of interfacial shear strength from single fiber pull-out tests allows an evaluation of the bonding ability. Additionally, fiber surface before and after pull-out is examined using reflected light microscopy. Contact angle measurements are done to evaluate possible influences of the surface energy and polarity. Density measurements are used to compare weight potential of the different mono-material and core-shell fibers. The results show good mechanical properties for all fiber materials. The interfacial shear strength is ≈ 2-3 times higher for fibers with polyketone compared to the ones with polypropylene at the fibers surface, which can be explained by higher surface energy and polarity of the polyketone compared to polypropylene and different surface deformation during pull-out. Lower densities are reached by fibers containing polypropylene. KW - polymer fibers KW - concrete reinforcement KW - core-shell fiber KW - coextrusion KW - polypropylene KW - polyketone Y1 - 2024 U6 - https://doi.org/10.1063/5.0204946 VL - 3158 IS - 1 ER - TY - CHAP A1 - Seliger, Norbert A1 - Helmbrecht, Cordula T1 - A high-frequency performance and degradation study of adhesive conductive EMI shielding tapes during High-Temperature Storage T2 - Proccedings CIPS 2024 - 13th International Conference on Integrated Power Electronics Systems N2 - The variation of the contact impedance of adhesive conductive EMI shielding tapes under high temperature storage (HTS) of 110degC is investigated. The adhesive tapes under test are implemented as signal return paths in microstrip lines. Changes in the ground plane impedance by adhesive deterioration are analyzed by S-parameter measurements from 1MHz to 3GHz. A circuit model for contact impedance degradation is proposed and applied in simulation of board level shielding. Contact resistance and contact capacitance are found to increase significantly after 2400h, causing a declined magnetic field shielding effectiveness by 30 dB below 500 MHz. KW - EMI KW - Shielding tape KW - High-Temperature Storage KW - adhesive conductive EMI shielding tape Y1 - 2024 SN - 978-3-8007-6288-0 SN - 0341-3934 SP - 297 EP - 303 PB - VDE VERLAG GMBH CY - Düsseldorf ER - TY - CHAP A1 - Seliger, Norbert A1 - Honsa, Johannes T1 - Time-variable Mutual Inductance for Enhanced Inductive Power Transmission T2 - Proceedings International Symposium on Fundamentals of Electrical Engineering 2023 (ISFEE 2023) N2 - Enhanced inductive power transmission (IPT) between coaxially arranged circular coils is introduced by time-modulation of the mutual inductance. This modulation is accomplished by coherent switching of the short circuit current induced in a third loop. An analytical circuit model supporting the design for future time-modulated IPT systems is derived. We demonstrate an increase in load rms-voltage by 13% (28% gain in power) compared to an unmodulated transfer on an experimental system operating at fundamental frequencies ranging from 40kHz to 500kHz. KW - Mutual Inductance KW - Inductive Power Transmission KW - Time-variable Inductance Y1 - 2023 SN - 979-8-3503-0856-3 U6 - https://doi.org/10.1109/ISFEE60884.2023.10637204 PB - IEEE CY - Bucharest, Romania ER -