Energie und Mobilität
Refine
Year of publication
- 2021 (60) (remove)
Document Type
- Article (21)
- conference proceeding (article) (18)
- conference talk (10)
- Report (5)
- Part of a Book (2)
- Master's Thesis (2)
- conference proceeding (presentation, abstract) (1)
- Preprint (1)
Is part of the Bibliography
- no (60)
Keywords
- Erneuerbare Energien (10)
- Energiewende (7)
- Klimaneutralität (7)
- Power-to-Gas (6)
- Sektorenkopplung (3)
- Archaeen (2)
- Batterien (2)
- Battery management system (2)
- Battery management systems (2)
- DC-DC power converters (2)
- Netzpuffer (2)
- Power-to-X (2)
- Stromnetz (2)
- Stromspeicher (2)
- Wasserstoff (2)
- decentralized control (2)
- 100% renewable energy scenarios (1)
- Alter (1)
- Ammoniaksynthese (1)
- Anisotropy (1)
- Arbeitspunktabhängigkeit (1)
- Ash (1)
- Batteries (1)
- Biogasanlage (1)
- Biological methanation (1)
- Biologische Methanisierung (1)
- Blindleistung (1)
- Blindleistungsmanagement (1)
- Blindleistungsquellen (1)
- CARBON RECYCLING SYSTEM (1)
- CDTire (1)
- CHILLERS (1)
- CI engine (1)
- CO2 (1)
- Climate (1)
- Climate policy (1)
- Compliant tensegrity structure (1)
- Computer architecture (1)
- Control systems (1)
- Cooling (1)
- Costs (1)
- DBD PLASMA ACTUATORS (1)
- DC-DC converter (1)
- DC-DC power convertors (1)
- DIFFUSION (1)
- Diesel Engine (1)
- DoE (1)
- ETHANOL ADSORPTION (1)
- EXCITATION (1)
- Electric vehicles (1)
- Electrolysis (1)
- Elektroantrieb (1)
- Emissionen (1)
- Energiespeicher (1)
- Energy System (1)
- Energy policy (1)
- Erdkabel (1)
- Erdverlegte Übertragungsleitungen (1)
- FLOW-CONTROL (1)
- FTIR (1)
- FTire (1)
- Feldversuch (1)
- Ferrofluids (1)
- Flexibilität (1)
- GDI (1)
- GPF (1)
- Geräuschentwicklung (1)
- Glass Industry (1)
- Haber-Bosch (1)
- Hardware (1)
- Heat decarbonisation (1)
- Household heat (1)
- Hydrogen (1)
- Klimaschutz (1)
- Leaf spring suspension (1)
- Liquid hold-up maximization (1)
- Lokales Sozialkapital (1)
- Low-carbon heating (1)
- MATLAB (1)
- MEMS (1)
- METHANOL (1)
- MIicrostructure (1)
- Manipulationsrisiken (1)
- Matrix (1)
- Messtechnik (1)
- Methane production (1)
- Methanothermobacter (1)
- Methanothermococcus (1)
- Microprocessors (1)
- Multibody dynamics (1)
- Multibody-simulation (1)
- Multistability (1)
- NVH (1)
- Netzmodell (1)
- Netzplanung (1)
- Non-classical locomotion (1)
- Optimization (1)
- Optimized packing-organism combination (1)
- Oxyfuel (1)
- PDMS (1)
- PERFORMANCE (1)
- Particle (1)
- Photovoltaik (1)
- Power system stability (1)
- Power-to-Hydrogen (1)
- Power-to-Methane (1)
- Psychoakustik (1)
- Python (1)
- Q-Dynamik (1)
- Quartiersgestaltung (1)
- Reactor concept (1)
- Renewable Energies (1)
- Renewable energy sources (1)
- Rieselbett Bioreaktor (1)
- Rieselbett-Bioreaktor (1)
- SCALE (1)
- SDBD (1)
- SEPARATION CONTROL (1)
- Schallentstehung (1)
- Senioren (1)
- Sensitivitätsanalyse (1)
- Simulink (1)
- Solarstrom (1)
- Sozialraum (1)
- Space heating (1)
- Stability analysis (1)
- Stadtviertel (1)
- Synchronmaschine (1)
- THERMAL-ENERGY STORAGE (1)
- TMeasy tyre model (1)
- TRANSFORMATION (1)
- TRANSPORTATION (1)
- Thermophilic archaea (1)
- Time measurement (1)
- Trickle-bed reactor (1)
- Vehicle modelling (1)
- Verteilungsnetz (1)
- WATER-ADSORPTION (1)
- Wohnen (1)
- Wohnsituation (1)
- Wärmetransport (1)
- ZFSV (1)
- Zeitweise fließfähiger selbstverdichtender Verfüllbaustoff (1)
- aberrations due to digitization (1)
- adsorption (1)
- aerospace engineering (1)
- aging (1)
- air cooling (1)
- anti-icing (1)
- battery fitness (1)
- battery life testing (1)
- battery storage plants (1)
- beam-model (1)
- bidirectional power flow (1)
- biologische Methanisierung (1)
- capacitance (1)
- cappillary doublet (1)
- cleat (1)
- commercial vehicles (1)
- common rail injection (1)
- cooling concept (1)
- coupled air springs (1)
- design Kinematics (1)
- design kinematics (1)
- diamagnetic (1)
- digital pulse-width modulation (DPWM) (1)
- distributed power generation (1)
- e-axle (1)
- eFuels (1)
- effective thermal conductivity (1)
- efficiency (1)
- elastomer dielectric (1)
- electric fuels (1)
- energy transition (1)
- fatigue limit (1)
- five-Link model (1)
- flux barrier (1)
- frequency analysis (1)
- hardware in the loop testing (1)
- heat transformer (1)
- heat upgrading (1)
- heavy commercial vehicles (1)
- hydrogen (1)
- hydrogen storage (1)
- hysteresis (1)
- impedance spectroscopy (1)
- interfacial magnetocapacitance (1)
- iron/iron oxide (1)
- lithium-ion battery (1)
- load sharing (1)
- low power DC/DC buck conversion (1)
- low-temperature plasma (1)
- magnetic asymmetry (1)
- magnetoactive elastomer (1)
- magnetoactive polymer (1)
- magnetoelectric effect (1)
- magnetorheological elastomer (1)
- magnetostriction (1)
- methanation (1)
- microcontrollers (1)
- multiferroic heterostructure (1)
- noise-vibration-harshness (1)
- object oriented programming (1)
- output voltage sampling (1)
- parameter sensitivity analysis (1)
- piezoelectric effect (1)
- power convertors (1)
- power generation control (1)
- power grids (1)
- pseudocharge (1)
- radiant heat flow map (1)
- rapeseed oil (1)
- reaction kinetics (1)
- redox reactions (1)
- restructuring of the filler (1)
- rough road (1)
- second life battery (1)
- sector coupling (1)
- sectoral integration (1)
- simulation (1)
- solar selective thermal insulation system (SATIS) (1)
- state-of-charge determination (1)
- state-of-health (1)
- system testing (1)
- toroid (1)
- total solar energy transmittance (1)
- traction drive system (1)
- tyre modelling (1)
- ultra-small-angle neutron scattering (1)
- vehicle coupling (1)
- vehicle dynamics (1)
- voltage control (1)
- voltage regulators (1)
- voltage transformer (1)
- waste heat (1)
- working pairs (1)
- wound field synchronous machine (1)
- yearly energetic performance assessment (1)
Institute
- Fakultät Elektro- und Informationstechnik (37)
- Fakultät Maschinenbau (18)
- Forschungsstelle für Energienetze und Energiespeicher (FENES) / Forschungsgruppe Energiespeicher (16)
- Combustion Engines and Emissions Control Laboratory (CEEC) (7)
- Forschungsstelle für Energienetze und Energiespeicher (FENES) / Forschungsgruppe Energienetze (5)
- Labor Sorptionsprozesse (5)
- Labor Datenkommunikation (4)
- Labor Elektrische Maschinen und Antriebstechnik (3)
- Labor Industrielle Elektronik (3)
- Labor Intelligente Materialien und Strukturen (3)
Begutachtungsstatus
- peer-reviewed (30)
- begutachtet (2)
The prediction of structure-borne noise using numerical methods has a crucial influence during the development process of modern passenger cars. In order to minimise the dynamic forces from the chassis transferred to the body structure, multibody simulation (MBS) can be used. The link between the road surface and the chassis is established by the tyre and its own structural dynamic characteristics. Therefore, it is substantial and the main goal of the present paper to investigate the Noise, Vibration and Harshness (NVH) performance of two commercial physical tyre models available and commonly used in the market. The intention is to point out what kind of results (up-to-date) a user of these structural dynamic tyre models, namely FTire and CDtire/3D, will get with a focus on NVH. The authors strictly follow the established process of how to obtain the fitted tyre property files, as any other user of FTire and CDTire currently does. This process includes a measurement campaign of the real tyre and a subsequent fitting of the tyre property file. The fitting in this case is provided by the tyre model developers themselves, namely cosin and Fraunhofer ITWM. The tyre models are then integrated into the MBS software MSC.Adams where their performance will be assessed based on measured wheel-hub forces in the time and frequency domain up to 300 Hz.
The tightening of the emission legislation and political and social demands for sustainable mobility are forcing the automotive industry to develop complex, high precision mechatronic drive systems. The increasing precision of mechatronic components generally leads to an increase in structural excitation and thus to a rise in noise. The so-called ticking of the fuel injection system has a rather low sound pressure level compared to the residual engine noise. Nevertheless, the impulsive and high frequency noise character leads to a decline concerning the perception of comfort and sound quality. In order to identify the sound quality of fuel injection systems as a frontloading measure, a system test bench has been developed which represents the structure-borne and airborne sound radiation of the stand-alone injection system in a close to series configuration. In this paper, measures for the acoustic optimization of injection systems and their effects on the robustness of the system are discussed. The focus is on engine idling, since at this operating point the ticking of the injectors and high-pressure pump can be perceived most clearly due to the low masking effects of other noise sources. For this purpose, the injection parameters were measured during full engine operation and transferred to the system test bench. By using a special development control unit, it was possible to modify the parameters, quantify their influence on the acoustic behavior and, based on this, define NVH optimized control strategies. For the robustness evaluation of the NVH optimized control strategies, key functions of the injection system were analyzed under varying boundary conditions in system operation on an injection rate test bench.
FMS-Berichte (Mai 2021)
(2021)
Dieser Bericht entstand auf Initiative der Studierenden des 2020 neu gegründeten Masterstudiengangs „Elektro- und Informationstechnik (MEI)“, die an der Pflichtlehrveranstaltung „Forschungsmethoden und Seminar (FMS)“ im Wintersemester 2020/21 teilnahmen.
Diese Lehrveranstaltung hat das Ziel, systematisch an das wissenschaftliche Arbeiten, speziell die Wissenschaftskommunikation, heranzuführen.
Daher war geeignete Literatur zu einem individuellen Thema zu recherchieren, Veröffentlichungen auf ihre Relevanz hin zu beurteilen und letztendlich eine eigene Ausarbeitung basierend auf der Literaturrecherche zu erarbeiten und diese in einem Vortrag zu präsentieren.
Parallel dazu erfolgte im Theorieteil die entsprechende Hinführung zu den verschiedenen Elementen der Wissenschaftskommunikation:
• Bedeutung der Wissenschaftskommunikation für die Arbeit der Ingenieure in Forschung und Entwicklung
• Literaturrecherche, Suchmaschinen, Sichtung und Analyse vorhandener Publikationen, Bewertung der Qualität aufgefundener Fachliteratur, Auswahl geeigneter Materialien für die eigene Arbeit
• Aufbereitung und Darstellung der recherchierten technischer Inhalte in Form einer seitenanzahlbegrenzten wissenschaftlichen Ausarbeitung
• Einhalten formaler Randbedingungen bzgl. Strukturierung, einschl. Bildnachweise und Zitationsstile
• Peer-review-Prozess bei wertschätzender Beurteilung der Leistung anderer
• Publikumsangepasstes Aufbereiten komplexer fachlicher Inhalte mit hochschulöffentlicher Präsentation der Ergebnisse
• Führen mündlicher wissenschaftlicher Diskurse
Nachdem die Masterstudierenden in der Regel über noch keine eigene
wissenschaftliche Forschungserfahrung bzw. -inhalte verfügen, lag der wählbare Schwerpunkt der Literatursuche auf der Bearbeitung von vorgegeben aktuellen technischen oder gesellschaftspolitischen Forschungsthemen.
For lithium iron phosphate batteries (LFP) in aerospace applications, impedance spectroscopy is applicable in the flat region of the voltage-charge curve. The frequency-dependent pseudocapacitance at 0.15 Hz is presented as useful state-of-charge (SOC) and state-of-health (SOH) indicator. For the same battery type, the prediction error of pseudocapacitance is better than 1% for a quadratic calibration curve, and less than 36% for a linear model. An approximately linear correlation between pseudocapacitance and Ah battery capacity is observed as long as overcharge and deep discharge are avoided. We verify the impedance method in comparison to the classical constant-current discharge measurements. In the case of five examined lithium-ion chemistries, the linear trend of impedance and SOC is lost if the slope of the discharge voltage curve versus SOC changes. With nickel manganese cobalt (NMC), high impedance modulus correlates with high SOC above 70%.
A numerical parameter sensitivity analysis of the design parameters of the recently published solar selective thermal insulation system (SATIS) has been carried out to enhance its thermal and optical properties. It turned out that the insulation properties of SATIS can be effectively improved by reducing the length of the glass closure element. Increasing the area share of the light conducting elements (LCEs) and decreasing their length-to-diameter (L/D) ratio were identified as key parameters in order to increase the solar gain. Two SATIS variants were compared with the same wall insulation without SATIS in a yearly energetic performance assessment. The SATIS variant with 10 mm length of the closure element, 44.2% area share of LCE, as well as front and rear diameters of 12 mm/9 mm shows an 11.8% lower transmission heat loss over the heating period than the wall insulation without SATIS. A new methodology was developed to enable the implementation of the computed solar gains of SATIS in 1D simulation tools. The result is a radiant heat flow map for integration as a heat source in 1D simulation models. A comparison between the 1D and 3D models of the inside wall heat fluxes showed an integral yearly agreement of 98%.
A magnetoelectric (ME) voltage transformer is fabricated on the basis of a ferromagnetic (FM)-piezoelectric (PE) heterostructure comprising two equally thick laminated layers of an amorphous FM alloy and a piezoceramic lead zirconate-titanate layer sandwiched between them. The structure, placed inside an excitation coil, is electrically poled and magnetized in the direction of the long axis. The primary voltage is applied to the coil and the secondary voltage is measured between the electrodes of the PE material. It is shown for the first time that the change in the total thickness of magnetic layers significantly influences the transformer ' s characteristics. At the largest total thickness of FM layers of 138 mu m, the open-circuit voltage transformation ratio K has a maximum value of about 20, and the power transfer efficiency eta at a matched resistive load of about 20 k omega reaches 45%. The variation of the control magnetic field in the range of 0-21.6 kA m(-1) makes it possible to change the voltage transformation ratio K from zero to the maximum value. A simple model allows one to calculate the dependence of the characteristics of the ME transformer on the frequency of the primary voltage, thickness of the FM layers, control magnetic field, and the load.
Insulation of thermal energy storage tanks is fundamental to reduce heat losses and to achieve high energy storage efficiency. Although water tanks were extensively studied in the literature, the enhancement of the insulation quality is often overlooked. The use of vacuum insulation has the potential to significantly reduce heat losses without affecting the dimension of the storage system. This paper shows for the first time the results of the heat losses tests done for a 0.535 m3 water tank for residential building applications built with a double wall vacuum insulation. The different tests show that the rate of heat losses strictly depends on the temperature distribution inside the tank at the beginning of the experiment. Compared to a conventional water tank insulated with conventional materials, the U-value of the lateral surface was reduced by almost three times (from 1.05 W/K·m2 to 0.38 W/K·m2) using vacuum insulation. However, the bottom part, which is usually used to place the support parts and the piping, is the critical design part of those tanks acting as a thermal bridge with the ambient and enhancing heat losses.
Ultra-small-angle neutron scattering (USANS) experiments are reported on isotropic magnetoactive elastomer (MAE) samples with different concentrations of micrometer-sized iron particles in the presence of an in-plane magnetic field up to 350 mT. The effect of the magnetic field on the scattering curves is observed in the scattering vector range between 2.5 x 10(-5) and 1.85 x 10(-4) angstrom(-1). It is found that the neutron scattering depends on the magnetization history (hysteresis). The relation of the observed changes to the magnetic-field-induced restructuring of the filler particles is discussed. The perspectives of employing USANS for investigations of the internal microstructure and its changes in magnetic field are considered.
This work aims at investigating the reduction/oxidation (redox) reaction kinetics on iron oxide pellets under different operating conditions of thermochemical hydrogen storage. In order to reduce the iron oxide pellets (90% Fe2O3, 10% stabilizing cement), hydrogen (H2) is applied in different concentrations with nitrogen (N2), as a carrier gas, at temperatures between between 700 ∘C and 900 ∘C, thus simulating the charging phase. The discharge phase is triggered by the flow of a mixture out of steam (H2O) and N2 at different concentrations in the same temperature range, resulting in the oxidizing of the previously reduced pellets. All investigations were carried out in a thermo-gravimetric analyzer (TGA) with a flow rate of 250mL/min. To describe the obtained kinetic results, a simplified analytical model, based on the linear driving force model, was developed. The investigated iron oxide pellets showed a stable redox performance of 23.8% weight reduction/gain, which corresponds to a volumetric storage density of 2.8kWh/(L bulk), also after the 29 performed redox cycles. Recalling that there is no H2 stored during the storage phase but iron, the introduced hydrogen storage technology is deemed very promising for applications in urban areas as day-night or seasonal storage for green hydrogen.