TY - CHAP A1 - Hirschmüller, Sebastian A1 - Marais, Brendan A1 - Brischke, Christian A1 - Krey, Adrian A1 - Bösing, Janine ED - The International Research Group on Wood Protection, T1 - Wood protection with cement – Part 1: Coating matters and durability of cement coated wood T2 - Proceedings IRG Annual Meeting. IRG/WP 20-60483. 51th IRG Annual Meeting N2 - The use of wood in geotechnical applications has seen renewed interest. However, concerns related to the durability and service life of wood in ground contact applications remain. Wood has the potential to substitute commonly used steel and concrete in the geotechnical engineering sector, but solutions to extending the service life and maintenance intervals require long-lasting wood protection systems capable of inhibiting fungal and bacterial decay. Cement, one of the constituents of concrete was identified as a potential coating material for wood used in soil stabilisation works. Spruce and beech wood rest rolls from commercial veneer peeling has been identified as a potential source for cement-coated geotechnical wood products. Norway spruce and European beech wood was subsequently used in this study. In this study, a series of tests related to dimensional stability and fungal durability were undertaken to investigate the adhesion of a cement coating to wood and to assess the effect of a cement coating on the resistance to fungal decay. Swelling and shrinkage tests of uncoated specimens were undertaken to investigate dimensional stability. Laboratory fungal durability tests assessed changes in wood durability of specimens coated with a novel, flexural cement coating. Wood impregnated with Polyethyleneglycol-dimethacrylate (PEGDMA) prior to cement coating was investigated to improve wood dimensional stability and reduce cracking of the cement coating under changing wood moisture conditions. Cement coating thickness and delamination tests then assessed the durability of the novel cement coating itself. Results from fungal durability tests showed that a continuous, flexural, and crack-free cement coating was imperative to a wood durability improvement. Double cement-coated spruce wood showed improved resistance to decay by basidiomycetes (Coniphora puteana and Trametes versicolor). Results from swelling and shrinkage tests showed that an improvement in dimensional stability would assist in achieving a durable cement coating and impregnation with Polyethyleneglycol-dimethacrylate (PEGDMA) is one manner to improve dimensional stability and therefore cement adhesion to the wood substrate. KW - Coating KW - Cement KW - Durability KW - PEGDMA KW - pH KW - Wooden pilings Y1 - 2020 SP - 1 EP - 25 PB - The International Research Group on Wood Protection 2020 CY - Stockholm ER - TY - CHAP A1 - Hoffmann, L. A1 - Schemme, Michael A1 - Pavsek, V. A1 - Dratschmidt, F. A1 - Raue, F. A1 - Ehrenstein, Gottfried Wilhelm T1 - Hysteresis Measurements – Making Fatigue Testing more Expressive T2 - 1st International Conference on Mechanics of Time Dependent Materials KW - Plastic KW - Kunststoff Y1 - 1995 CY - Ljubljana ER - TY - CHAP A1 - Schemme, Michael A1 - Ehrenstein, Gottfried Wilhelm T1 - Quality Assurance and Regularity of SMC-Materials T2 - Tagungsband 50th SPI Conference KW - FVK Y1 - 1995 CY - Cincinnati ER - TY - JOUR A1 - Schemme, Michael A1 - Ehrenstein, Gottfried Wilhelm T1 - Quality Assurance in the Processing of Long Fibre Reinforced Plastics JF - Kunststoffe plast europe KW - FVK Y1 - 1994 ER - TY - JOUR A1 - Schemme, Michael T1 - LFT – development status and perspectives JF - Reinforced Plastics KW - FVK Y1 - 2008 UR - https://doi.org/10.1016/S0034-3617(08)70036-5 VL - 52 IS - 1 SP - 32 EP - 39 ER - TY - CHAP A1 - Schemme, Michael T1 - Material basics of long fibre reinforced thermoplastic materials T2 - Tagungshandbuch zum 2. EATC Automotive Seminar KW - FVK Y1 - 2020 SP - 1 EP - 7 ER - TY - CHAP A1 - Schemme, Michael T1 - Light weight car applications with composites T2 - Tagungshandbuch zur Internationalen ABEX Automotive Conference KW - FVK Y1 - 2020 ER - TY - CHAP A1 - Schemme, Michael T1 - Industry survey and material basics of long fibre reinforced thermoplastic materials T2 - Tagungshandbuch zum 3. EATC Automotive Seminar KW - FVK Y1 - 2020 SP - 1 EP - 10 ER - TY - CHAP A1 - Schemme, Michael T1 - Trends in light weight car applications: focusing on composites T2 - Tagungshandbuch zur Internationalen Rieter Automotive Conference KW - FVK Y1 - 2020 ER - TY - CHAP A1 - Seliger, Norbert T1 - A Differential Relaxation Oscillator for Inductive Power Transfer T2 - 2022 IEEE Industrial Electronics and Applications Conference (IEACon) N2 - We present a novel differential relaxation oscillator for inductive power transfer. The proposed oscillator offers an automatic adaption of the oscillation period to a change in the power link impedance, which ensures a high efficient operation for variable loads and coupling factors. A detailed circuit model of the self-oscillation system is provided with analytical design equations. We find a large self-oscillation range for variable coupling factors and loads. The theoretical results are confirmed by circuit simulation and measurements carried out on a low-power demonstrator system. We demonstrate non-resonant and robust self-adaption of the relaxation oscillator to coupling factors ranging from k=0.6-0.9. KW - Relaxation Oscillator KW - Inductive Power Transfer Y1 - 2022 SP - 1 EP - 6 PB - IEEE ER - TY - CHAP A1 - Seliger, Norbert T1 - Self-Oscillating Capacitive Power Transfer with Multiple Receiver Capability and Coupling Path Adaption T2 - Proceedings 24th European Conference on Power Electronics and Applications (EPE’22 ECCE Europe) KW - Capacitive Coupling KW - Half Bridge KW - Wireless power transmission KW - Gallium Nitride (GaN) KW - HEMT KW - Contactless energy transfer KW - High frequency power converter Y1 - 2022 PB - EPE ER - TY - JOUR A1 - Hummel, Sabine A1 - Obermeier, Katharina A1 - Zier, Katja A1 - Krommes, Sandra A1 - Schemme, Michael A1 - Karlinger, Peter T1 - Analysis of Mechanical Properties Related to Fiber Length of Closed-Loop-Recycled Offcuts of a Thermoplastic Fiber Composites (Organo Sheets) JF - Materials N2 - Increasing demand for energy-efficient means of transport has steadily intensified the trend towards lightweight components. Thermoplastic glass fiber composites (organo sheets) play a major role in the production of functional automotive components. Organo sheets are cut, shaped and functionalized by injection molding to produce hybrid components, such as those used in car door modules. The cutting process produces a considerable amount of production waste, which has thus far been thermally recycled. This study develops a closed mechanical recycling process and analyzes the different steps of the process. The offcuts were shredded using two shredding methods and implemented directly in the injection-molding process. Using tensile tests and impact bending tests, the material properties of the recycled materials were compared with the virgin material. In addition, fiber length degradation via the injection-molding process and the influence of the waterjet-cutting process on the mechanical properties are investigated. Recycled offcuts are both comparable to new material in terms of mechanical properties and usability, and are also economically and ecologically advantageous. Recycling polypropylene waste with glass fiber reinforcement in a closed loop is an effective way to reduce industrial waste in a sustainable and economical production process. KW - sustainability KW - fiber composites KW - recycling KW - renewable materials KW - manufacturing process KW - resource efficiency KW - emissions KW - degradation KW - characterization Y1 - 2022 UR - https://doi.org/10.3390/ma15113872 VL - 15 IS - 11 SP - 3872 ER - TY - CHAP A1 - Seliger, Norbert A1 - Dechant, Eduard A1 - Kennel, Ralph T1 - EMI mitigation by substrate integrated common mode filter T2 - Proceedings of 12th International Conference on Integrated Power Electronics Systems (CIPS 2022) KW - EMI filter, DGS, GaN-HEMTs Y1 - 2022 PB - VDE CY - Berlin (Germany) ER - TY - CHAP A1 - Dechant, Eduard A1 - Seliger, Norbert A1 - Kennel, Ralph T1 - Common Mode DGS EMI Filter Integrated into a GaN Half Bridge Switching Cell T2 - Procceedings International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM 2022) KW - EMI filter, DGS, GaN-HEMTs, Switching Cell Y1 - 2022 PB - Mesago ER - TY - CHAP A1 - Seliger, Norbert A1 - Faltlhauser, Georg T1 - Active Expansion Sampling of Magnetic Near-Fields in Unbounded Regions T2 - Proceedings 26th IEEE Workshop on Signal and Power Integrity (IEEE SPI-2022) KW - Magnetic Near Field Scanning, Machine Learning, Active Expansion Sampling, Method of Moments Y1 - 2022 PB - IEEE ER - TY - CHAP A1 - Seliger, Norbert T1 - A Differential Relaxation Half-Bridge Oscillator for Inductive Power Transfer T2 - Proceedings PCIM Europe 2023 N2 - We present inductive power transfer (IPT) with a half-bridge converter based on differential relaxation self-oscillation. The oscillation dynamics of the converter automatically adapts to variation in the inductive coupling link and changes in the load, respectively. Design equations based on theoretical circuit analysis reveals a high power transfer efficiency (>90%) for alteration of coupling distance in the strong coupling regime. A prototype system employing GaN-HEMTs confirms the theoretically predicted characteristics of the proposed circuit. KW - wireless power transfer, inductive power transfer, half-bridge converter, relaxation oscillator Y1 - 2023 PB - Mesago GmbH CY - Nürnberg 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 - Fischer, Markus A1 - Michalk, Wibke A1 - Bogenberger, Klaus ED - Transportation Research Board, T1 - CDRpy: Data-Driven Decision Support for the Roll-out of public Charging Infrastructure in urban Areas T2 - Transportation Research Board Annual Meeting N2 - In this study, the data-driven simulation framework CDRpy is presented, validated and applied using the example of the city of Munich to support decision-makers in the rollout of public charging infrastructure in urban areas. The innovation of the study lies in the fact that CDRpy can be used to evaluate different concepts for public charging infrastructure at a detailed level. The Demand is mapped based on real charging events for different types of electric vehicles and pricing models, and the evaluations can be broken down to the level of individual charging stations. The developed framework was validated using charge detail records from the largest operator of public charging infrastructure in Munich for the years 2020, 2021 and 2022 based on various criteria. In a further case study, the additional demand for public charging infrastructure in the city was estimated for the year 2030. The results indicate that mixed and timebased pricing models could reduce the required number of public charging points from 7,055 to 6,374 by around 10% compared to energy-based pricing models. Determining the expansion requirements for each sub-district shows that the additional demand for public charging infrastructure varies greatly across the city. Since both technological and economic perspectives are considered, the study is relevant for all decisionmakers involved in the planning, operation and scaling of public charging infrastructure. KW - Plug-in Electric Vehicles KW - public charging infrastructure KW - roll-out of public charging stations KW - pricing policies KW - charge detail records Y1 - 2025 ER - TY - GEN A1 - Kimmerle, Sven-Joachim A1 - Dvorsky, Karl A1 - Liess, Hans-Dieter T1 - Failure Rates from Data of Field Returns T2 - MATHMOD Short Contribution Volume 2025 N2 - To determine failure rates is a challenge, if there are only a few failures and typical failure rates are low. As an application example we are interested in failure rates of electrical automotive components for automated/autonomous driving. As method we focus here on the exploitation of field data. Our contribution classifies different approaches from statistics and shows how this can be applied to real-world production figures as available in industry. KW - Mathematische Modellierung KW - Entscheidung bei Unsicherheit KW - Bordnetz KW - Reliabilität KW - Konfidenzbereich KW - modelling uncertainties and stochastic systems KW - automotive vehicle electrical systems KW - reliability KW - failure rates KW - autonomous driving Y1 - 2025 U6 - https://doi.org/10.34726/9011 SP - 23 EP - 24 PB - reposiTUm, TU Wien CY - Wien ER - TY - CHAP A1 - Zenz, Vitus A1 - Muscat, Dirk A1 - Strübbe, Nicole T1 - Development of a new granulate feeding system for gas pressurized extrusion processes T2 - ANTEC 2023 N2 - One major problem of a continuous process like plastic extrusion is their incapability to deal with non-local gas pressure. This is an inherent problem because a continuous process has an open end in the feeding port where pressure can escape. In this study a novel feeding system was developed to enable granulate feeding into gas pressurized processes inside a single- or twin-screw extruder. With this apparatus gas pressure can be applied inside the extrusion process. The apparatus separates the pressurized extruder from the dosing equipment that feeds the extruder. It keeps the pressure inside the system while continuously feeding new material into the process. A small-scale prototype was designed for proof-of concept. The small size of the prototype was able to handle small amounts of granulates of around 100 - 200 g/h. An applied gas pressure of 8 bar was achieved. In future optimizations, throughput can be increased and maximum applied gas pressure towards 15-20 bar. KW - Plastic feeding KW - Granulate KW - Extrusion KW - Compounding KW - Reactive Extrusion Y1 - 2023 PB - SPE ANTEC ER -