Energie und Mobilität
Refine
Year of publication
Document Type
- conference proceeding (article) (157)
- Article (129)
- Part of a Book (41)
- conference talk (32)
- Report (11)
- conference proceeding (presentation, abstract) (8)
- Book (7)
- Preprint (4)
- Edited collection (1)
- Review (1)
Has Fulltext
- no (391) (remove)
Is part of the Bibliography
- no (391)
Keywords
- Erneuerbare Energien (26)
- Energiewende (25)
- Klimaneutralität (22)
- Power-to-Gas (17)
- Sektorenkopplung (16)
- Energiespeicher (14)
- Wasserstoff (8)
- Power-to-X (7)
- Optimization (5)
- PERFORMANCE (5)
- permanent magnet synchronous machine (5)
- synchronous machines (5)
- Archaeen (4)
- BEHAVIOR (4)
- Battery management systems (4)
- Cooling (4)
- Pipeline (4)
- Rotors (4)
- asynchronous machines (4)
- composites (4)
- hysteresis (4)
- permanent magnet machines (4)
- stators (4)
- vehicle dynamics (4)
- Adsorption heat pump (3)
- Ammonia (3)
- Battery management system (3)
- Blindleistungsregelung (3)
- Computer architecture (3)
- Diesel Engine (3)
- ETHANOL ADSORPTION (3)
- Electric vehicles (3)
- Ethanol (3)
- Inverters (3)
- Klimaschutz (3)
- MODEL (3)
- Netzplanung (3)
- Photovoltaik (3)
- Renewable energy sources (3)
- Rieselbett-Bioreaktor (3)
- Running ductile fracture (3)
- SYSTEMS (3)
- Speicherbedarf (3)
- Systemintegration (3)
- Torque (3)
- Windings (3)
- decentralized control (3)
- dynamic load (3)
- hydrogen storage (3)
- induction machines (3)
- iron/iron oxide (3)
- lumped element thermal equivalent circuit model (3)
- magnetoactive elastomer (3)
- redox reactions (3)
- safety (3)
- simulation (3)
- squirrel cage (3)
- temperature (3)
- temperature estimation (3)
- variable speed (3)
- waste heat (3)
- Absorption heat pump (2)
- Activated carbon (2)
- Adsorbent coating (2)
- Adsorption kinetics (2)
- Altbaumodernisierung (2)
- Anisotropy (2)
- Automobilindustrie (2)
- Automotive engineering (2)
- Batterien (2)
- Battery (2)
- Biological methanation (2)
- Biologische Methanisierung (2)
- CARBON (2)
- CO2 decompression (2)
- Capacitors (2)
- Coefficient of performance (2)
- Coils (2)
- Compliant tensegrity structure (2)
- Condition Monitoring (2)
- Connectors (2)
- Corrosion (2)
- Crack arrest (2)
- Current measurement (2)
- DC-DC power converters (2)
- DC-link capacitor (2)
- DIESELMOTOR (2)
- DRIVEN (2)
- DYNAMICS (2)
- DoE (2)
- EMISSIONS (2)
- Elektroantrieb (2)
- Energieeinsparung (2)
- Energy storage (2)
- Engineering Education (2)
- FRAMEWORK (2)
- Fahrerassistenzsystem (2)
- Feeds (2)
- Finite-Elemente-Methode (2)
- Fluid-Struktur-Wechselwirkung (2)
- Functional Safety (2)
- GDI (2)
- HYDROLYSIS (2)
- Hardware (2)
- Kraftfahrzeug (2)
- Kraftstoff (2)
- Liquid hold-up maximization (2)
- MAGNETIC-FIELD (2)
- MICROSTRUCTURE (2)
- Magnetic Saturation (2)
- Massenspektrometer (2)
- Mathematical model (2)
- Messtechnik (2)
- Methanation (2)
- Methane production (2)
- Methanothermobacter (2)
- Methanothermococcus (2)
- Modelica (2)
- Modeling (2)
- Motorcycles (2)
- Multistability (2)
- NOX (2)
- Netzausbau (2)
- Netzmodell (2)
- Netzpuffer (2)
- Netztransformator (2)
- OUTPUT (2)
- Optimized packing-organism combination (2)
- Ortsnetz (Energie) (2)
- Particle (2)
- Photovoltaics (2)
- Pipeline failure (2)
- Power-to-gas (2)
- RHEOLOGY (2)
- Reactive Power (2)
- Rissfortschritt (2)
- SCR (2)
- SELECTIVE CATALYTIC-REDUCTION (2)
- SENSITIVE ELASTOMERS (2)
- Selective catalytic reduction (2)
- Smart grids (2)
- Solarstrom (2)
- Standards (2)
- Stromnetz (2)
- Stromspeicher (2)
- Stromtragfähigkeit (2)
- THERMAL-ENERGY STORAGE (2)
- Trickle-bed reactor (2)
- VISCOELASTIC PROPERTIES (2)
- adsorption (2)
- aging (2)
- biologische Methanisierung (2)
- capacitance (2)
- computational fluid dynamics (2)
- consistent parameters (2)
- design Kinematics (2)
- dielectric properties (2)
- distributed management (2)
- efficiency (2)
- energy transition (2)
- erneuerbare Energie (2)
- fault tolerant control (2)
- gasoline particulate filter (GPF) (2)
- induction machine (2)
- interface (2)
- invertors (2)
- magnetorheological elastomer (2)
- magnetostriction (2)
- microwave cavity perturbation (2)
- multi phase (2)
- numerische Simulation (2)
- partial load efficiency (2)
- permanent magnet motors (2)
- radio-frequency (RF) (2)
- renewable energy (2)
- semantic (2)
- simuliertes Ergebnis (2)
- soot mass determination (2)
- vibration energy harvesting (2)
- 1,3-Dimethyl-2-imidazolidinone (1)
- 2-Pyrrolidone (1)
- 2-Trifluoroethanol (1)
- 4WS (1)
- ABGASKONZENTRATION (1)
- ABGASTRENNUNG (1)
- ABGASZUSAMMENSETZUNG (1)
- ABS (1)
- AC Machine (1)
- ADSORBENTS (1)
- ADSORPTION REFRIGERATOR (1)
- AHT (1)
- AI chatbot (1)
- AMR (1)
- AQSOA-Z02 (1)
- ARXML (1)
- AUTOMATIC-GENERATION (1)
- Abgas (1)
- Acoustic emission testing (1)
- Acoustic noise (1)
- Active Front-End (1)
- AdBlue urea (1)
- Adaptation models (1)
- Adaptivregelung (1)
- Adsorbent Coatings (1)
- Adsorber heat exchanger (1)
- Adsorption (1)
- Adsorption refrigeration (1)
- Adsorptive Heat Transformers (1)
- Aging (1)
- Airgap Eccentricity (1)
- Algorithmus (1)
- Alkadiene (1)
- Alkane (1)
- Antriebsstrang (1)
- Apparent contour (1)
- Application: Framework (1)
- Ash (1)
- Ash detection (1)
- Aspen Custom Modeler (1)
- Auspuffgas (1)
- Automatisierung (1)
- Automobiles (1)
- Autonomous Mobile Robot (1)
- Availability (1)
- Availability Decentralized control (1)
- Axles (1)
- BAND-PASS FILTERS (1)
- BICYCLE DYNAMICS (1)
- BIMORPH (1)
- BIOCATALYTIC METHANATION (1)
- BLENDS (1)
- Batteries (1)
- Battery charging (1)
- Bayesian networks (1)
- Benchmarking (1)
- Bending Stiffness (1)
- Benzinmotor (1)
- Beschleunigung (1)
- Betriebsbedingung (1)
- Bicycles (1)
- Biogasanlage (1)
- Biokraftstoff (1)
- Blended Learning (1)
- Blindleistung (1)
- Bose-Einstein condensates (1)
- Braunkohle (1)
- Brennwert (1)
- Bruchmechanik (1)
- Bruchmechanische Prüfung (1)
- Business Education (1)
- CARBON-DIOXIDE (1)
- CDTire (1)
- CELL (1)
- CFD (1)
- CHILLER (1)
- CHILLERS (1)
- CI engine (1)
- CNN (1)
- CO2 capture (1)
- CO2-methanation (1)
- CONVERSION (1)
- COOLING SYSTEMS (1)
- CREEP FORCES (1)
- CSTR (1)
- Calculation (1)
- Calibration (1)
- Cameras (1)
- Capacitance between spheres (1)
- Capillary-driven flows (1)
- Carbon dioxide emissions (1)
- Catalysis (1)
- Catenary (1)
- Chamber Flux (1)
- Channel coded processor concept (1)
- ChatGPT (1)
- Chemische Industrie (1)
- Clausius-Clapeyron (1)
- Clay bricks (1)
- Climate (1)
- Climate policy (1)
- Climate-neutral (1)
- Coating (1)
- Cohesive zone model (1)
- Cold Ambient Conditions (1)
- Cold Start (1)
- Competence orientation (1)
- Complexit (1)
- Complexity theory (1)
- Compressive strength (1)
- Computer vision (1)
- Concentrated (1)
- Constant volume combustion chamber (1)
- Constrained Optimization (1)
- Control algorithms (1)
- Control systems (1)
- Control theory (1)
- Controller Area Network (1)
- Convolutional networks (1)
- Cornering Resistance (1)
- Costs (1)
- Couplers (1)
- Couplings (1)
- Critical velocity (1)
- DAMPING PROPERTIES (1)
- DAQ (1)
- DBD PLASMA ACTUATORS (1)
- DC-DC converter (1)
- DC-DC power convertors (1)
- DECOMPOSITION (1)
- DEPENDENCE (1)
- DIELECTRIC-PROPERTIES (1)
- DIFFUSION (1)
- DMC (1)
- DOPED MN/TIO2 (1)
- DWT testing (1)
- Dach (1)
- Data transfer (1)
- Databases (1)
- DeNO(x) (1)
- Decarbonisation (1)
- Decision-making (1)
- Demagnetization (1)
- Deregulierung (1)
- Design kinematics (1)
- Design methodology (1)
- Deutschland (1)
- Development Cooperation (1)
- Diagnostics (1)
- Diesel exhaust gas (1)
- Dieselabgas (1)
- Dieselkraftstoff (1)
- Differential Evolution (1)
- Differential equations (1)
- Digitization (1)
- Direkteinspritzerottomotor (1)
- Direkteinspritzung (1)
- Domestic prices (1)
- Double wishbone suspension system (1)
- Drehmoment (1)
- Drehschwingung (1)
- Druckverlust (1)
- Dual Axles (1)
- Dual-inverter (1)
- Durchströmung (1)
- Dynamic contact point (1)
- Dynamic ductile fracture (1)
- Dynamic simulation (1)
- E-Fuels (1)
- EINSTEIN CONDENSED GAS (1)
- EINSTUFENFILTER (1)
- ELASTOMERS (1)
- ESP (1)
- EXCITATION (1)
- Eccentricity (1)
- Economic Analysis (1)
- Eddy Covariance (1)
- Effective medium theory (1)
- Effective permittivity (1)
- Effective road plane (1)
- Eingabedaten (1)
- Einparken (1)
- Einspeisung (1)
- Electric machines (1)
- Electric machines and drives (1)
- Electric vehicle (1)
- Electrical Engineering (1)
- Electrical engineering (1)
- Electrical rotor asymmetries (1)
- Electrochemistry (1)
- Electrolyser (1)
- Electronic learning (1)
- Elektrik (1)
- Elektrizität (1)
- Elektrochemische Energieumwandlung (1)
- Elektrochemisches Verfahren (1)
- Elektromobilität (1)
- Energiebewusstes Bauen (1)
- Energieintensive Industrie (1)
- Energienetz (1)
- Energienetzplanung (1)
- Energieproduktion (1)
- Energiesystemmodellierung (1)
- Energietechnik (1)
- Energieversorgung (1)
- Energy System (1)
- Energy Transition (1)
- Energy efficiency (1)
- Energy harvesting (1)
- Energy load forecasting (1)
- Energy policy (1)
- Engine Cold Start (1)
- Engineering education (1)
- Entscheidungsunterstützungssystem (1)
- Entstaubung (1)
- Equations of motion (1)
- Erneuerbare Energien, Klimaneutralität, Energiewende, Sektorenkopplung, Power-to-Gas (1)
- Ethen (1)
- Ethics Education (1)
- Ethin (1)
- Eurocodes (1)
- Exam analysis (1)
- Exhaust aftertreatment (1)
- Exhaust gas recirculation (1)
- Existing buildings (1)
- Experiential learning (1)
- FERROGELS (1)
- FIELD (1)
- FLOW-CONTROL (1)
- FLUID (1)
- FLUIDS (1)
- FREIGHT WAGON (1)
- FTIR (1)
- FTire (1)
- Fahrdynamik (1)
- Fahrzeugdynamik (1)
- Failure probability (1)
- Falling film evaporator (1)
- Fallstudie (1)
- Feature extraction (1)
- Ferngasleitung (1)
- Ferrofluids (1)
- Festbett (1)
- Field Oriented Control (1)
- Final energy consumption (1)
- Fleet operations (1)
- Fluid flow (1)
- Fluid-structure interaction (1)
- Fluid-structure-interaction (1)
- Forest Floor (1)
- Formgebungswerkzeug (1)
- Four-wheeled Handling Model (1)
- Franca IDL (1)
- Free Bending (1)
- Frequency Analysis (1)
- Frequency measurement (1)
- Frequency modulation (1)
- Frequency synchronization (1)
- Fuel Blend (1)
- Fuel Cell (1)
- Fuel Ethanol (1)
- Fuel Mass (1)
- Fuel Vapor Mass (1)
- GASFILTER (1)
- GEOMETRY (1)
- GPF (1)
- Gas (1)
- Gas utilization efficiency (1)
- Gasoline particulate flter (1)
- Generators (1)
- Geometric contact point (1)
- Geräuschentwicklung (1)
- Glass Industry (1)
- Glass Melting (1)
- Greenhouse gas emissions (1)
- Ground penetrating radar (1)
- HAUPTSTROMFILTER (1)
- HE-4 (1)
- HEAT-RECOVERY (1)
- HELIUM (1)
- HYDROGELS (1)
- Haus (1)
- Heat conduction in cylindrical shell (1)
- Heat decarbonisation (1)
- Heat pipes (1)
- Heat pump (1)
- Household heat (1)
- Human factors (1)
- Hydraulic turbines (1)
- Hydrocarbons (1)
- Hydrogen (1)
- Hydrogen export (1)
- Hydrogen prices (1)
- Hydrogen regulation (1)
- Hydrothermal stability (1)
- ICT (1)
- IDL (1)
- IGNITION (1)
- IMPACT (1)
- IMPROVEMENT (1)
- INJECTION (1)
- ISO 26262 (1)
- ISO Standards (1)
- Ignition behaviour (1)
- Image reconstruction (1)
- In situ pH shift (1)
- Induction machines (1)
- Induction motor (1)
- Industrial plant (1)
- Inertialsensor (1)
- Infrared-reflective (1)
- Infrastruktur (1)
- Injection Strategy (1)
- Integrated circuit modeling (1)
- Integrated control (1)
- Interactive and collaborative learning (1)
- Interleaving (1)
- Inverse kinematics (1)
- Investitionskosten (1)
- Ion-molecule reaction (1)
- Ionisation (1)
- Jatropha oil (1)
- Just in Time Teaching (1)
- KARANJA (1)
- KATALYTISCHE ABGASNACHVERBRENNUNG (1)
- KATALYTISCHER REAKTOR (1)
- KINETICS (1)
- KOHLENWASSERSTOFF (ABGAS) (1)
- Kalman filter (1)
- Kaltstart (1)
- Karosserieanbauteil (1)
- Kinematic and compliance test (1)
- Kohlenmonoxid (1)
- Kohlenwasserstoffe (1)
- Konstruktionstechnik (1)
- Kostenanalyse (1)
- Kostenreduktion (1)
- Kugelschüttung (1)
- LAMINAR (1)
- LATERAL DYNAMICS (1)
- LIFE-CYCLE COST (1)
- LINEAR-MODEL (1)
- LOCOMOTION (1)
- LOW-TEMPERATURE SCR (1)
- Lageregelung (1)
- Langzeitarchivierung (1)
- Lastverteilung <Energietechnik> (1)
- Latent heat thermal energy storage (LHTES) (1)
- Launch vehicle (1)
- Leaf spring suspension (1)
- Least squares fitting (1)
- Leichtbau (1)
- Leistungsmanagement (1)
- Leitungsmaßnahme (1)
- Life Quality Index (1)
- Liquid rocket engines (1)
- Liquid-phase decomposition (1)
- Living Lab (1)
- LoRa (1)
- Load flow (1)
- Load modeling (1)
- Loading (1)
- Logic gates (1)
- Logistics (1)
- Long term analysis (1)
- Low Head (1)
- Low voltage (1)
- Low-carbon heating (1)
- Low-temperature DeNO(x) (1)
- MAGNETOELASTIC BEHAVIOR (1)
- MASS (1)
- MASS-TRANSFER (1)
- MATLAB (1)
- MBW model (1)
- MECHANICAL-PROPERTIES (1)
- MELT STATE (1)
- MEMS (1)
- MIXTURES (1)
- MIicrostructure (1)
- MK TEMPERATURES (1)
- MMC model (1)
- MSIL (1)
- Magnetoactive elastomer (1)
- Magnetorhelogical elastomer (1)
- Magnetorheological effect (1)
- Management strategy (1)
- Maschinenbetrieb (1)
- Mass spectrometry (1)
- Material handling (1)
- Matrix (1)
- MeFo (1)
- Mechanical stability (1)
- Mechatronic design method (1)
- Mechatronics (1)
- Medium voltage (1)
- Mehrkörpersystem (1)
- Messmethode (1)
- Methan (1)
- Microchannels (1)
- Microfluidics (1)
- Microprocessors (1)
- Milk-run systems (1)
- Miniature devices (1)
- Mittelspannung (elektrisch) (1)
- Mixture Formation (1)
- Mobile communication (1)
- Mobile robots (1)
- Model reduction (1)
- Modelica Standard Library (1)
- Modelica Standard Library MSL (1)
- Montagesystem (1)
- Montiergerät (1)
- Mortar (1)
- Motor (1)
- Motor Current Signature Analysis (MCSA) (1)
- Motor drives (1)
- Motorenöl (1)
- Motorsteuerung (1)
- Motoröl (1)
- Multi-microcomputer system (1)
- Multibody Model (1)
- Multibody dynamics (1)
- Multibody model (1)
- Multibody system (1)
- Multibody systems (1)
- Multibody-simulation (1)
- Multilayer Model (1)
- Multiple view geometry (1)
- NAVIGATION (1)
- NH3 (1)
- NILM (1)
- NITRIC-OXIDE (1)
- NON-HERTZIAN (1)
- NRTL (1)
- NVH (1)
- Nahtloses Rohr (1)
- Netz-Management (1)
- Netzanschluss (1)
- Netzbetreiber (1)
- Netzbetrieb (1)
- Netzmanagement (1)
- Netzmittel (1)
- Netzstabilität (Energienetz) (1)
- Netzverstärkung (1)
- Neural networks (1)
- Niederspannung (1)
- Niederspannungsnetz (1)
- Nitrogen Oxide (1)
- Nitrogen oxides (1)
- Non-classical locomotion (1)
- Non-destructive test (1)
- Non-road mobile machinery (1)
- Nonholonomic mechanics (1)
- Nonlinear state observer (1)
- Numerical solution (1)
- OF-THE-ART (1)
- OME (1)
- ONSET (1)
- OXIDATION (1)
- OXIDATIONSKATALYSATORANLAGE (1)
- OXIDE CATALYST (1)
- Object oriented modeling (1)
- Object-oriented programming (1)
- Online-Analyse (1)
- Online-Messung (1)
- Online-Messverfahren (1)
- Open innovation (1)
- Optimal Power Flow (1)
- Optimization of Field Current (1)
- Organic working pairs (1)
- Orthogonal collocation (1)
- Oscillatory flow (1)
- Ottomotor (1)
- Oxidationskatalysator (1)
- Oxyfuel (1)
- PASSIVE RIDER (1)
- PCM (1)
- PDMS (1)
- PERFORMANCE ENHANCEMENT TECHNIQUES (1)
- PERIODISCH ZU REINIGENDER FILTER (1)
- PERMEABILITY (1)
- PHASE-CHANGE MATERIAL (1)
- POLYETHYLENE (1)
- POLYMER DEGRADATION (1)
- POWER (1)
- POWER-TO-HEAT (1)
- PRODUCTS (1)
- PROGRESS (1)
- PURE SHEAR (1)
- PWM Converter (1)
- PYROLYSIS (1)
- Parameter identification (1)
- Parameter optimization (1)
- Parameterabschätzung (1)
- Particle number (1)
- Particle-size-distribution (1)
- Partikelemission (1)
- Partikelfilter (1)
- Payne effect (1)
- Percolation threshold (1)
- Permanent Magnet (PM) (1)
- Permanent Magnet Synchronous Motor (1)
- Phase measurement (1)
- Photovoltaikanlage (1)
- Pico Hydro (1)
- Piezoelectric transducer (1)
- Planning (1)
- Plate heat exchanger (1)
- Polymer (1)
- Power cables (1)
- Power system stability (1)
- Power-to-Heat (1)
- Power-to-Methane (1)
- PowerFactory (1)
- Privatisierung (1)
- Problem-based learning (1)
- Production systems (1)
- Production unit (1)
- Project Based Learning (1)
- Propellers (1)
- Propen (1)
- Prosumer (1)
- ProsumerIridium (1)
- Protocols (1)
- Prüfstand (1)
- Psychoakustik (1)
- PtG (Power-to-Gas) (1)
- Pulse width modulation (1)
- Pumpspeicherwerk (1)
- Python (1)
- Quality of service (1)
- Quantum turbulence (1)
- R4-MOTOR (1)
- REIFENKRAFT (1)
- REMOVAL (1)
- RENEWABLE ENERGY (1)
- RESIDENTIAL HEAT (1)
- RME (1)
- ROLLING-CONTACT (1)
- RUBBER (1)
- Radiative asymmetry (1)
- Radio-frequency (1)
- Railway vehicles (1)
- Random heterogeneous medium (1)
- Rapeseed oil fuel (1)
- Rapsöl (1)
- Reactive Power Potentials (1)
- Reactive power (1)
- Reactiver Power Planning (1)
- Reactor concept (1)
- Real-Time (1)
- Real-time Simulation (1)
- Real-time decision making (1)
- Receivers (1)
- Rechenleistung (1)
- Rechenzeit (1)
- Reconfigurable architectures (1)
- Reduced model (1)
- Refrigeration (1)
- Regeltransformator (1)
- Reifentest (1)
- Renewable Energies (1)
- Renewable sources (1)
- Residential seasonal storage (1)
- Resistor aging (1)
- Review (1)
- Rieselbett Bioreaktor (1)
- Risikoanalyse (1)
- Risk analysis (1)
- Rissausbreitung (1)
- Road vehicles (1)
- Rooftop solar photovoltaics (1)
- Rope Curvature (1)
- Rotating electrical three phase machines (1)
- Run-off-Road scenarios (1)
- SCALE (1)
- SDBD (1)
- SEPARATION CONTROL (1)
- SHM (1)
- STLF (1)
- Scalability (1)
- Schadstoff (1)
- Schallentstehung (1)
- Schienenfahrzeug (1)
- Schienenverkehr (1)
- Schwefel (1)
- Schwingungsdämpfung (1)
- Schüttgut (1)
- Seasonal performance (1)
- Secondary batteries (1)
- Sektorkopplung (1)
- Semantic: Mapping (1)
- Semi-physical model (1)
- Sensorless vector control (1)
- Servers (1)
- Shafts (1)
- Signal to noise ratio (1)
- Simulation (1)
- Simulation Experiment (1)
- Simulink (1)
- Slant fracture (1)
- Smart material (1)
- Societal risk (1)
- Software (1)
- Software-Lösung (1)
- Softwarearchitektur (1)
- Solar power (1)
- Solarenergie (1)
- Solarmodul (1)
- Solenoid injector (1)
- Solidification (1)
- Soot mass determination (1)
- Soybean oil (1)
- Sozialverträglichkeit (1)
- Space heating (1)
- Spannband (1)
- Spannung (elektrisch) (1)
- Spannungsanhebung (1)
- Spannungsregelung (1)
- Specific solution circulation (1)
- Speicherintegration (1)
- Speicherkapazität (1)
- Speichermarkt (1)
- Speichertechnologien (1)
- Stability Verification (1)
- Stability analysis (1)
- State of charge (SOC) (1)
- Static contact point (1)
- Statistical analysis (1)
- Steering System (1)
- Stone masonry (1)
- Straight Homogeneous Circular Cylinder (1)
- Straight vegetable oil combustion (1)
- Straight vegetable oil fuel (1)
- Stress state conditions (1)
- Stromerzeugung (1)
- Stromversorgung (1)
- Stromversorgung <Elektrotechnik> (1)
- Strukturdynamik (1)
- Superfluid helium (1)
- Suspension kinematics (1)
- Suspension systems (1)
- Switches (1)
- Synchronization (1)
- Synchronmaschine (1)
- Synchronous Generator (1)
- Synchronous Motor (SM) (1)
- Synthetic methane (1)
- Synthetische Kraftstoffe (1)
- Systemvergleich (1)
- Szenarioanalyse (1)
- TCPIP (1)
- TECHNOLOGIES (1)
- THERMOAUTOTROPHICUS (1)
- THERMOOXIDATIVE DEGRADATION (1)
- TIME-RESOLVED RHEOLOGY (1)
- TMeasy Tire Model (1)
- TMeasy tire model (1)
- TMeasy tyre model (1)
- TRANSFORMATION (1)
- TSN-Netz (1)
- Tagebau (1)
- Tail Ropes (1)
- Task analysis (1)
- Tensegrity structure (1)
- Test Bench Investigations (1)
- Thermal energy storage (1)
- Thermal models (1)
- Thermochemistry (1)
- Thermophilic archaea (1)
- Three-dimensional Vehicle Model (1)
- Time measurement (1)
- Tire Force Dynamics (1)
- Tire road contact (1)
- Topology (1)
- Torque Vectoring (1)
- Total cost of ownership (1)
- Tracer-Technik (1)
- Trajectory (1)
- Transdisciplinary Education (1)
- Transient response (1)
- Transportation control (1)
- Twistbeam suspension (1)
- Tyre dynamics modelling (1)
- Tyre testing (1)
- UEBERDRUCKFILTER (1)
- UREA HYDROLYSIS (1)
- Uncertainties (1)
- Uncertainty (1)
- VEGETABLE-OILS (1)
- Validierung (1)
- Vapor pressure (1)
- Vehicle Dynamics (1)
- Vehicle Fleet Charging (1)
- Vehicle dynamics (1)
- Vehicle fleet modelling (1)
- Vehicle modeling (1)
- Vehicle modelling (1)
- Vehicle models (1)
- Vehicle-to-home (1)
- Vehicles (1)
- Vergleichsuntersuchung (1)
- Verkabelung (1)
- Verkehrsdichte (1)
- Verkehrssektor (1)
- Vibration driven motion (1)
- Virtual Test Rig (1)
- Virtual collaboration (1)
- Viskositätsverringerung (1)
- Voltage Control (1)
- Voltage Stability (1)
- Voltage source inverter (VSI) (1)
- Voltage-Oriented Control (1)
- Volumenmessung (1)
- Vortex shedding (1)
- WATER-ADSORPTION (1)
- WHEELSET-TRACK INTERACTION (1)
- Wall paint (1)
- Water Turbine (1)
- Wavelength measurement (1)
- Wettbewerb (1)
- Wheels (1)
- Wiederaufbau (1)
- Wind power pants (1)
- Windkraft (Energiequelle) (1)
- Wireless sensor networks (1)
- Wirkleistung (1)
- Wirtschaftlichkeitsrechnung (1)
- Working pair (1)
- Wärmekapazität (1)
- Wärmespeicherung (1)
- Wärmetransport (1)
- Wärmeversorgung (1)
- Wärmeübertrager (1)
- X-ray (1)
- Zeitmessung (1)
- Zeolite-based Adsorbent Coatings (1)
- Zeolite-coated Heat Pumps (1)
- Zeolite-water (1)
- Zündung (1)
- aberrations due to digitization (1)
- acceptance (1)
- aerospace engineering (1)
- air cooling (1)
- aktive Schwingungsdämpfung (1)
- anti-icing (1)
- appliance monitoring (1)
- aromatische Kohlenwasserstoffe (1)
- array (1)
- automated driving (1)
- automated grid planning (1)
- automotive services (1)
- autonomes Fahren (1)
- autonomous systems (1)
- bandwidth (1)
- battery fitness (1)
- battery life testing (1)
- battery parameterization (1)
- battery storage plants (1)
- beam-model (1)
- bidirectional power flow (1)
- broadband (1)
- broken rotor bar (1)
- bubble column reactor (1)
- cappillary doublet (1)
- carrier phase shift (1)
- charging infrastructure (1)
- cleat (1)
- commercial stick–slip friction models (1)
- commercial vehicles (1)
- common rail injection (1)
- communication theory (1)
- component model (1)
- composite sorbents (1)
- constructive alignment (1)
- contact less charging (1)
- container-based virtualization (1)
- control (1)
- converter (1)
- cooling (1)
- cooling concept (1)
- coupled air springs (1)
- cycle stability (1)
- d-axis Inductance (1)
- damping factor (1)
- data sheet (1)
- decarbonization (1)
- deep bar effect (1)
- demagnetization (1)
- design (1)
- design kinematics (1)
- dezentrale Stromerzeugung (1)
- diamagnetic (1)
- digital pulse-width modulation (DPWM) (1)
- distributed power generation (1)
- distribution grid (1)
- driver assistance systems (1)
- dual 3-phase inverter (1)
- dual three phase system (1)
- dynamic friction model (1)
- dynamische Simulation (1)
- dynamisches Messen (1)
- e-axle (1)
- effective medium approximation (1)
- effective thermal conductivity (1)
- elastic properties (1)
- elastomer dielectric (1)
- electric Machine models (1)
- electric sensing devices (1)
- electric vehicles (1)
- electro mobility (1)
- elektrische Energieverteilung (1)
- energy (1)
- energy storage (1)
- energy-efficient building restoration (1)
- engine test bench (1)
- equivalent circuits (1)
- experimental testing (1)
- extensional strain (1)
- fatigue limit (1)
- fault diagnosis (1)
- fault location (1)
- finite element analysis (1)
- finite element method (FEM) (1)
- five-Link model (1)
- floating device (1)
- flux barrier (1)
- fractional slot (1)
- framework (1)
- frequency analysis (1)
- frequency up-conversion (1)
- functional mockup interface (1)
- fundamental wave (1)
- funktionale Sicherheit (1)
- glass (1)
- grid data handling (1)
- group risk (1)
- hardware in the loop testing (1)
- harmonic analysis (1)
- harmonics (1)
- heat transformer (1)
- heat upgrading (1)
- heavy commercial vehicles (1)
- historic quarter (1)
- hohe Dichte (1)
- household survey (1)
- human safety (1)
- hydrogen (1)
- iduction motor (1)
- impedance spectroscopy (1)
- individual risk (1)
- inductance (1)
- inductance modeling (1)
- induction motor (1)
- integrated modular motor drive (1)
- interfacial magnetocapacitance (1)
- interior magnet (1)
- interleaved inverters (1)
- irradiance (1)
- isothermal reactions (1)
- kinetics of reactions (1)
- lithium niobate (1)
- lithium-ion battery (1)
- load (electric) (1)
- load impulses (1)
- load sharing (1)
- long-term stick (1)
- low frequency (1)
- low power DC/DC buck conversion (1)
- low-temperature plasma (1)
- lumped model (1)
- machine design (1)
- machine testing (1)
- magnetic asymmetry (1)
- magnetic cores (1)
- magnetic fields (1)
- magnetic flux (1)
- magnetic levitation (1)
- magnetic potential difference (1)
- magnetism and magnetic properties (1)
- magnetoactive polymer (1)
- magnetodeformation (1)
- magnetodielectric effect (1)
- magnetoelectric effect (1)
- magnetomechanical effect (1)
- maximum power tracking (1)
- mechanical hysteresis (1)
- mechanical stoppers (1)
- mechatronics (1)
- membrane reactor (1)
- metamodels (1)
- methanation (1)
- metrics (1)
- microcontrollers (1)
- mixing rule (1)
- mobile robots (1)
- module (1)
- monitoring (1)
- motion control (1)
- motorbike (1)
- multi phase electric machines (1)
- multibody dynamics (1)
- multiferroic heterostructure (1)
- multiple stationary loads (1)
- nachhaltiges Sourcing (1)
- noise-vibration-harshness (1)
- non-isothermal reactions (1)
- nonlinear saturation effects (1)
- nonlinear susceptibility (1)
- numerical analysis (1)
- object oriented programming (1)
- ontologies (1)
- operating conditions (1)
- operational amplifier circuit (1)
- optimale Nutzung (1)
- optimized threshold (1)
- output voltage sampling (1)
- parameter sensitivity analysis (1)
- partial factors (1)
- pelletizing process (1)
- percolation threshold (1)
- permanent magnet (1)
- physical battery model (1)
- piezoelectric cantilever (1)
- piezoelectric effect (1)
- piezoelectric sensor (1)
- pitch control (1)
- plant (1)
- power (1)
- power convertors (1)
- power electronics (1)
- power engineering computing (1)
- power generation control (1)
- power grids (1)
- power system security (1)
- probabilistic methods (1)
- pseudocharge (1)
- quality control (1)
- quasi static (1)
- radiant heat flow map (1)
- railway (1)
- random heterogeneous medium (1)
- rapeseed oil (1)
- reaction kinetics (1)
- reliability (1)
- reliability analysis (1)
- reliability level (1)
- reluctance (1)
- resource isolation (1)
- resource management (1)
- restructuring of the filler (1)
- ripple current reduction (1)
- risk acceptance (1)
- risk analysis (1)
- robot dynamics (1)
- robuste Bauweise (1)
- robuste Regelung (1)
- rotor asymmetries (1)
- rotor fault (1)
- rough road (1)
- seasonal thermal storage (1)
- second life battery (1)
- sector coupling (1)
- segmentation (1)
- self-assembly (1)
- self-consistent (1)
- self-discharge (1)
- self-phase modulation (1)
- sensor node (1)
- sensor placement (1)
- sensors and actuators (1)
- simplified battery model (1)
- simulation model (1)
- skewing (1)
- skin effect (1)
- slip ring (1)
- snow load (1)
- soft error (1)
- solar energy (1)
- solar selective thermal insulation system (SATIS) (1)
- space vector modulation (SVM) (1)
- speed control (1)
- squirrel cage induction machine (1)
- standardization (1)
- state-of-charge determination (1)
- state-of-charge monitoring (1)
- state-of-health (1)
- statistical wind data (1)
- strain gauge (1)
- stress testing (1)
- structural engineering (1)
- structure (1)
- subharmonics (1)
- supercapacitor (1)
- supply security (1)
- surplus energy (1)
- sustainability (1)
- switching (1)
- synchronous machine (1)
- synchronous motor protection (1)
- synchronous motors (1)
- synchronous reluctance machine (1)
- synergy (1)
- system costs (1)
- system testing (1)
- target reliability (1)
- taxonomy (1)
- teaching text (1)
- temperature distribution (1)
- temperature sensors (1)
- terrestrial solar model (1)
- thermal analysis (1)
- thermal behavior (1)
- thermische Energie (1)
- thermoelectric generation (1)
- time transients (1)
- time-discrete control (1)
- toroid (1)
- total solar energy transmittance (1)
- traction drive system (1)
- traits (1)
- transient (1)
- two-phase composite material (1)
- tyre modelling (1)
- ultra-small-angle neutron scattering (1)
- uninterruptible power systems (1)
- user acceptance (1)
- vehicle coupling (1)
- voltage control (1)
- voltage regulators (1)
- voltage transformer (1)
- water content (1)
- winding displacement (1)
- windings (1)
- working pairs (1)
- wound field synchronous machine (1)
- yearly energetic performance assessment (1)
- Ökobilanzierung (1)
- Ölverbrauch (1)
- Überwachung (1)
Institute
- Fakultät Elektro- und Informationstechnik (208)
- Fakultät Maschinenbau (152)
- Forschungsstelle für Energienetze und Energiespeicher (FENES) / Forschungsgruppe Energiespeicher (71)
- Combustion Engines and Emissions Control Laboratory (CEEC) (39)
- Labor Elektrische Maschinen und Antriebstechnik (35)
- Forschungsstelle für Energienetze und Energiespeicher (FENES) / Forschungsgruppe Energienetze (27)
- Computational Mechanics and Materials Lab (CMM) (20)
- Technologie-Campus Neustadt an der Donau (20)
- Labor Intelligente Materialien und Strukturen (17)
- Fakultät Informatik und Mathematik (14)
Begutachtungsstatus
- peer-reviewed (172)
- begutachtet (7)
A magnetic levitation system is a perfect educational example of a nonlinear unstable system. Only with suitable control, a small permanent magnet can be held floating stable below a coil. After modeling and simulation of the system, control of the system can be developed. At the end, the control algorithm can be coded on a microcontroller, connected to a pilot plant.
As global demand for green hydrogen rises, potential hydrogen exporters move into the spotlight. However, the large-scale installation of on-grid hydrogen electrolysis for export can have profound impacts on domestic energy prices and energy-related emissions. Our investigation explores the interplay of hydrogen exports, domestic energy transition and temporal hydrogen regulation, employing a sector-coupled energy model in Morocco. We find substantial co-benets of domestic climate change mitigation and hydrogen exports, whereby exports can reduce domestic electricity prices while mitigation reduces hydrogen export prices. However, increasing hydrogen exports quickly in a system that is still dominated by fossil fuels can substantially raise domestic electricity prices, if green hydrogen production is not regulated. Surprisingly, temporal matching of hydrogen production lowers domestic electricity cost by up to 31% while the effect on exporters is minimal. This policy instrument can steer the welfare (re-)distribution between hydrogen exporting firms, hydrogen importers, and domestic electricity consumers and hereby increases acceptance among actors.
Automated use of wired measures in grid planning for solving current and voltage band problems
(2019)
This work deals with the use of cable exchange and parallel cabling as network expansion measures in the context of an automated grid planning for the elimination of current and voltage band problems in a distribution network. Inter alia, reference is made to a higher-level program, which is being developed in the EU project "CrossEnergy", and the procedures for remedying the limit value violations are presented.
Im Rahmen der vier Kopernikus-Projekte – Ariadne, ENSURE, P2X und SynErgie – wird die Transformation des deutschen Energiesystems hin zur Klimaneutralität analysiert. Im vorliegenden Bericht werden hierbei robuste Kernaussagen und relevante Unsicherheiten derjenigen Szenarien der Kopernikus-Schwesterprojekte dargestellt, die zur Zielsetzung die Klimaneutralität 2045 haben. Hierbei liegt der Fokus auf Indikatoren, die eine besonders hohe klimapolitische Relevanz haben.
Analysis and Improvement of Engineering Exams Toward Competence Orientation by Using an AI Chatbot
(2024)
ChatGPT is currently one of the most advanced general chatbots. This development leads to diverse challenges in higher education, like new forms of teaching and learning, additional exam methods, new possibilities for plagiarism, and many more topics. On the other side with the development of advanced AI tools, pure knowledge will be less and less important, and demands from industry will change toward graduates with higher competencies. Education has therefore to be changed from knowledge-centered toward competence centered. The goal of this article is to use ChatGPT for analyzing and improving the competence orientation of exams in engineering education. The authors use ChatGPT to analyze exams from different engineering subjects to evaluate the performance of this chatbot and draw conclusions about the competence orientation of the tested exams. The obtained information is used to develop ideas for increasing the competence orientation of exams. From this analysis, it is visible that ChatGPT gives good performance mainly where knowledge is tested. It has, however, much more problems with transfer questions or tasks where students need creativity or complex insights for finding new solutions. Based on this result, exams and also lectures can be optimized toward competence orientation.
Increasingly stringent emission limits have made particulate filters necessary for gasoline engines. Similar to diesel applications, gasoline particulate filters (GPFs) can be monitored by differential pressure measurement or by the radio-frequency-based filter diagnosis (RF sensor). In addition to measuring the soot loading, ash detection is critical for monitoring the GPF over the entire vehicle lifetime. Because the RF sensor detects the filter loading through a change in the dielectric properties of the GPF, it can detect not only soot but also ash. In diesel applications, the RF sensor has already demonstrated its potential for ash detection. To verify the feasibility of simultaneous ash and soot monitoring for GPFs, filters were loaded with ash on an engine test bench and measured on a lab test bench under defined synthetic exhaust gas conditions. By evaluating resonant modes, soot and ash could be clearly distinguished, as ash mainly affects the resonant frequency, while soot also changes the quality factor due to its high dielectric losses. However, higher soot loadings could not be detected by the resonant parameters, but instead by a frequency-averaged transmission signal. While the presence of ash caused an offset in this signal, its sensitivity to soot was not affected. Thus, the influence of ash can be corrected if the signal in the soot-free filter state is known, e.g., from the behavior of the resonant parameters. Therefore, even with a continuously increasing ash loading over the lifetime of a vehicle, an accurate soot detection is possible with the RF sensor.
Industrial plants can provide reactive power (Q) for system- and grid-serving behavior, for which a functioning reactive power management system is essential. To make reactive power retrieval as efficient and safe as possible, the selection of reactive power sources to meet the Q-demand must consider their sensitivities and the restrictions of the industrial grid, such as operating equipment utilization or voltage limits. On this basis, a concept for a sensitivity-based control strategy that manages the reactive power retrieval of multiple reactive power sources depending on a predefined reactive power demand value is proposed. Based on the simulation of an industrial plant in the medium-voltage grid, which can provide reactive power in the form of industrial compensation systems (ICS) and generators, the operation of the algorithm is shown.
Acoustic emission (AE) testing recently found its application in the wafer testing sector of the semiconductor industry. To find out the mechanical robustness of semiconductor devices, contact pads on the chip surface are intentionally overstressed with an indenter tip and the appearing oxide cracks are detected with help of the generated AE signals. This is done in a customized test bench with a patented sensor-indenter system. This paper presents an improved version of the measurement setup that solves certain disadvantages of it and can be used in a standard wafer prober. The main components of the developed sensor system are a strain gauge for contact force measurement and a piezoelectric sensor element for AE signal detection. Both components are integrated on a cantilever beam which has an exchangeable indenter tip at its free end. The cantilever probe is electrically conductive to enable electrical tests via the indenter tip. This smart sensor-cantilever combination (SCC) can be mounted with several adapter components on a carrier plate to place it in a wafer prober. For both sensor elements amplifier circuits are developed to enhance their signal-to-noise ratios (SNRs). A prototype setup is shown together with simulated and experimental results to demonstrate its performance. The mechanical properties of the cantilever, as well as the force sensor and the AE crack signals, already fulfill the requirements for an implementation in a wafer prober. To further improve the sensor resolutions and detection limits, several optimizations regarding the design of the SCC are in progress.
In this study, a pilot-scale trickle-bed reactor for biological methanation and various scale-up scenarios for 2023 and 2050 were investigated using LCA. A best- and worst-case scenario for technology development until 2050 was evolved using cross consistency analysis and morphological field, based on which the data for the ecological models were determined.The results show that the plant scale-up has a very positive effect on the ecological consequences of methanation. In the best-case scenario, the values are a factor of 23-780 lower than those of the actual plant today. A hot-spot analysis showed that especially electrolysis operation has a large impact on total emissions. The final Monte-Carlo simulation shows that the technology is likely to achieve a low GWP with a median of 104.0 kg CO2-eq / MWh CH4.
Combined Ash and Soot Monitoring in Gasoline Particulate Filters with a Radio-Frequency-Based Sensor
(2022)
In recent years, it turned out that primarily the number of ultrafine particles and not their mass is relevant in terms of harmful health effects. Therefore, exhaust emission standards are constantly being tightened with regard to the particulate number. To meet the emission limits, particulate filters have become necessary for gasoline engines. Similar to diesel applications, gasoline particulate filters (GPFs) can be monitored via differential pressure measurement or via a radio-frequency approach (RF-sensor). The latter is based on the influence of the soot conductivity on the electromagnetic field. To control the GPF, ash detection is of crucial importance besides the soot load monitoring. With the differential pressure system, this is only possible with high uncertainties due to the low pressure increase caused by ash. The RF-sensor, however, has already demonstrated its potential for ash detection in diesel applications. In order to verify the applicability of the system for GPFs, filters were loaded via a method for fast ash loading. Thereby, it was shown that by evaluating resonant modes – especially the resonant frequency – the ash loading can easily be measured as long as the filter is soot-unloaded. In contrast, soot loading can be determined independently from this by considering a frequency-averaged transmission signal between the antennas of the RF-sensor. Using a setup for radio-frequency material characterization, the dielectric parameters of the generated ash were also measured. In comparison with the properties of the synthetic soot PrintexU, ash showed significantly lower dielectric losses. Thus, the evaluation of the loss-dependent quality factor, which is only possible at low soot loadings, allows a precise conclusion whether the filter is completely soot-free. Furthermore, using synthetic soot loading, it could be shown that soot detection via the averaged transmission signal is not affected by ash. In summary, it could be shown that with the RF-sensor, ash and soot can be simultaneously detected.
Schlussbericht zum Verbundvorhaben NAMOSYN: Nachhaltige Mobilität durch synthetische Kraftstoffe
(2023)
Im Labor für Verbrennungsmotoren und Abgasnachbehandlung der OTH-Regensburg sollten im Zuge des NAMOSYN-Projektes zwei Vertreter klimaneutraler Kraftstoffe an verschiedenen Systemprüfständen (Motor-, Einspritzprüfstand, optisch zugängliche Einspritzkammer, …) und mit Hilfe von Simulationsmethoden für den Einsatz in bestehenden Verbrennungsmotoren untersucht werden. Synthetische Kraftstoffe aus der Gruppe der Oxymethylenether (OME) stellen eine CO2-neutrale Alternative zu fossilem Dieselkraftstoff dar. Für Ottomotoren wurde untersucht, ob der synthetische Kraftstoff DMC/MeFo (Dimethylcarbonat & Methylformiat) einen Ersatz für Ottokraftstoff darstellen kann, bzw. eine Drop-In-Fähigkeit gegeben ist.
Die OTH Regensburg bearbeitete 2 unabhängige Teilvorhaben zur motorischen Testung von synthetischen Kraftstoffen: „FC 1A: Motorische Testung von OME“ und „FC 2: Untersuchung von C1-Oxygenaten für Ottomotoren“. Die Projektlaufzeit betrug 3,5 Jahre, inkl. kostenneutraler Verlängerung um 6 Monate aufgrund der Corona-Pandemie.
Im FC1A "AP2-Nachrüstung Dieselmotoren" der OTH Regensburg lag der Fokus auf der Erforschung der Potentiale und der Umrüstung eines Einzylinder-Dieselmotors mit Pumpe-Leitung-Düse-(PLD)-Einspritzsystem des Projektpartners Motorenfabrik Hatz GmbH und Co. KG für OME-Betrieb.
Im AP2.1 wurden umfangreiche Daten gesammelt und Simulationsmodelle des Motors und PLD-Einspritzsystems erstellt und mit Dieselkraftstoff und OME validiert. Nachfolgend wurden Parameterstudien zur Geometrie des Einspritzsystems und der physikalischen Eigenschaften von OME durchgeführt.
In AP2.2 und AP2.3 wurden umfangreiche Untersuchungen an einem Motor- und Einspritzsystemprüfstand mit Diesel und OME durchgeführt und der Steuergerätedatensatz für den OME-Betrieb optimiert.
Die Ergebnisse zeigen, dass die Umstellung des Kraftstoffs auf OME, insbesondere bei einfachen Motoren mit rudimentärer Einspritztechnik und ohne Mittel zur NOx-Reduzierung (keine AGR oder SCR), ein enormes Potenzial zur Steigerung des Wirkungsgrads bei gleichzeitiger Reduzierung aller regulierten Schadstoffe (NOx, 𝑃N, 𝑃M, CO und 𝑉OC) eröffnet. Die Ergebnisse und generierten Simulationsmodelle unterstützen eine schnelle Serienentwicklung und Einführung von OME-Umrüstlösungen.
In FC 2 werden die vielversprechenden Kraftstoffe Methylformiat (MeFo) und Dimethylcarbonat (DMC) motorisch getestet. Untersuchungen am Kraftstoffsystem und wichtigen Komponenten dienen als Grundlage für das AP3.
Im AP3 wird die Machbarkeit der DMC/MeFo-Verbrennung am Vollmotor demonstriert und die erwarteten Emissionsvorteile gegenüber herkömmlichen Ottokraftstoffen gezeigt. Abweichend von der ursprünglichen Planung werden an der OTH Regensburg Kraftstoffblends aus Benzin und MeFo untersucht, um den Einsatzbereich des Kraftstoffs zu erweitern.
In AP5 werden potentielle Mischungsverhältnisse analysiert und die Eigenschaften der ausgewählten Kraftstoffmischungen an einem Einspritzratenprüfstand, an der Einspritzkammer und am Vollmotor untersucht. Es werden Einspritzverhalten, Gemischaufbereitung und Abgasemissionen bewertet.
Zudem wird eine Kraftstoffmischanlage entwickelt und ein optischer Zugang am Vollmotor ermöglicht. Eine Ölverdünnungsmesstechnik wird eingesetzt, um den Kraftstoffeintrag ins Motoröl zu untersuchen
Friction has long been an important issue in multibody dynamics. Static friction models apply appropriate regularization techniques to convert the stick inequality and the non-smooth stick–slip transition of Coulomb’s approach into a continuous and smooth function of the sliding velocity. However, a regularized friction force is not able to maintain long-term stick. That is why dynamic friction models were developed in recent decades. The friction force depends herein not only on the sliding velocity but also on internal states. The probably best-known representative, the LuGre friction model, is based on a fictitious bristle but realizes a too-simple approximation. The recently published second-order dynamic friction model describes the dynamics of a fictitious bristle more accurately. It is based on a regularized friction force characteristic, which is continuous and smooth but can maintain long-term stick due to an appropriate shift in the regularization. Its performance is compared here to stick–slip friction models, developed and launched not long ago by commercial multibody software packages. The results obtained by a virtual friction test-bench and by a more practical festoon cable system are very promising. Thus, the second-order dynamic friction model may serve not only as an alternative to the LuGre model but also to commercial stick–slip models.
Owing to increasingly stringent emission limits, particulate filters have become mandatory for gasoline-engine vehicles. Monitoring their soot loading is necessary for error-free operation. The state-of-the-art differential pressure sensors suffer from inaccuracies due to small amounts of stored soot combined with exhaust gas conditions that lead to partial regeneration. As an alternative approach, radio-frequency-based (RF) sensors can accurately measure the soot loading, even under these conditions, by detecting soot through its dielectric properties. However, they face a different challenge as their sensitivity may depend on the engine operation conditions during soot formation. In this article, this influence is evaluated in more detail. Various soot samples were generated on an engine test bench. Their dielectric properties were measured using the microwave cavity perturbation (MCP) method and compared with the corresponding sensitivity of the RF sensor determined on a lab test bench. Both showed similar behavior. The values for the soot samples themselves, however, differed significantly from each other. A way to correct for this cross-sensitivity was found in the influence of exhaust gas humidity on the RF sensor, which can be correlated with the engine load. By evaluating this influence during significant humidity changes, such as fuel cuts, it could be used to correct the influence of the engineon the RF sensor.
This work aims first to develop a dynamic lumped model for the isothermal reactions of hydrogen/steam with a single iron oxide/iron pellet inside a tubular reactor and to validate the model results against the experimental reaction kinetic data with the help of our STA device. To describe the temporal change in mass, and consequently, the temporal heat of reaction, the shrinking core model, based on the geometrical contracting sphere, is applied. It turned out that, the simulation model can reproduce the experimental, temporal concentration and temperature-dependent conversion rates with a maximum deviation of 4.6% during the oxidation reactions and 3.1% during the reduction reactions. In addition, a measured isothermal storage process comprising one reduction and one oxidation phase with a holding phase in between on a single reacting pellet could be reproduced with a maximum absolute deviation in the conversion rate of 1.5%. Moreover, a lumped, non-isothermal simulation model for a pelletized tubular redox-reactor including 2kg of iron oxide pellets has been established, in which the heat of reaction, heat transfer to the ambient and heat transfer between the solid and gas phases are considered. The temporal courses of the outlet gas concentration as well as the temperatures of the gas stream and the solid material at a constant input gas flow rate and a constant reacting gas inlet concentration but different input gas temperatures are estimated. Because of the endothermic nature of the reduction reaction, the inlet reacting gas temperature shall be kept high to prevent the severe temperature drop in the solid phase and, consequently, the significant reduction of the reaction rate. Contrary to that, the oxidation process requires lower input gas temperatures to avoid the excessive overheating of the reaction mass and, consequently, the sintering of the reacting pellets. Finally, five of the previous reactors have been connected in series to explore the influence of the changing inlet gas temperatures and concentrations on the dynamic performance of each storage mass.
Microchips are intensively used in almost all nowadays electronic devices. With the continuous advancement of our technologies, they get smaller in size than ever before. They generate high-intensity heat loads that need to be transported effectively such that they may function properly. Heat pipes have proven to be very effective in transporting relatively large heat loads from miniature components. They are of seamless structure that involves a working fluid capable of evaporation and condensation at the working temperature of the electronic chips. The working fluid is derived to move from the condenser to the evaporator via multiple microgrooves using capillary forces. It is important that the condensate reaches the evaporator at a proper rate such that no dry-out or flooding occur. In this work, we are particularly interested in the case of capillary-driven flows in rectangular microchannels. A generalized model is developed that works for axe-symmetric rectangular channels of arbitrary, moderately varying width profiles. It also accounts for any contrast of viscosity between the liquid and the vapor under isothermal conditions. The model shows to reduce to the special case of imbibition in straight and uniform microchannels, for which comparisons with experimental and modeling works show an excellent match. Cases representing linearly and quadratically varying converging/diverging width profiles have been explored. It is found that the viscosity ratio has a significant influence on the rate at which the meniscus advances. The model also negates the common practice found in the literature of using the formula developed for imbibition rates in capillary tubes for rectangular microchannels by replacing the diameter of the tube with the hydraulic diameter. It is also found that the channel profile has an influential effect on the imbibition rates. For tapered microchannels, the capillary force increases along the channel length while it decreases for diverging ones. It is interestingly demonstrated that, for quadratically tapered microchannel, the speed of the meniscus increases towards the end of the microchannel compared with linearly varying microchannels. On the other hand, for diverging microchannels, the speed of the meniscus decreases due to the increase in the cross-sectional area. Computational fluid dynamics (CFD) analysis has been conducted to provide a framework for confirmation and verification for which very good match has been established, which builds confidence in the modeling approach.
Appropriate climate change mitigation requires solutions for all actors of the energy system. The residential sector is a major part of the energy system and solutions for the implementation of a seasonal hydrogen storage system in residential houses has been increasingly discussed. A global analysis of prosumer systems including seasonal hydrogen storage with water electrolyser, hydrogen compressor, storage tank, and a fuel cell studying the role of such a seasonal household storage in the upcoming decades is not available. This study aims to close this research gap via the improved LUT-PROSUME model, which models a fully micro sector coupled residential photovoltaic prosumer system with linear optimisation for 145 regions globally. The modelling of the cost development of hydrogen storage components allows for the simulation of a residential system from 2020 until 2050 in 5-year steps in hourly resolution. The systems are cost-optimised for either on- or off-grid operation in eight scenarios including battery electric vehicles, which can act as an additional vehicle-to-home electricity storage for the system. Results show that implementation of seasonal hydrogen systems only occurs in least cost solutions in high latitude countries when the system is forced to run in off-grid mode. In general, a solar photovoltaic plus battery system including technologies that can cover the heat demand is the most economic choice and can even achieve lower cost than a full grid supply in off-grid operation for most regions until 2050. Additional parameters including the self-consumption ratio, the demand cover ratio, and the heat cover ratio can therefore not be improved by seasonal storage systems if economics is the main deciding factor for a respective system. Further research opportunities and possible limitations of the system are then identified.
Dual front steering axles are quite common in multi-axled heavy duty trucks. In standard layouts of such axle combinations, the steer motions of the wheels depend not only on the rotation of the steering wheel but also on the movements of the axles. As a consequence, the model complexity of the steering system should match with the complexity of the suspension model. The development of new technologies like advanced driver assistance systems or autonomous driving can only be accomplished efficiently using extensive simulation methods. Such kind of applications demand for computationally efficient vehicle models. This paper presents a steering system model for dual front axles of heavy duty trucks which supplements the suspension model of the axles. The model takes the torsional compliance of the steering column as well as the stiffness of the tie rods and the coupling rod into account. A quasi-static solution provides a straight forward computation including the partial derivatives required for an efficient implicit solver. The steering system model matches perfectly with comparatively lean, but sufficiently accurate multibody suspension models.
A prototype of a thermal insulation system to offer high selectivity of the solar gain regarding the solar incidence angle (SATIS) was applied to a typical solid brick masonry for existing buildings in Germany. Light conducting elements (LCEs) inclined at 19 ° were incorporated in SATIS, which equals the average solar noon angle in southern Germany during winter. The entire wall construction was experimentally investigated in a differential climatic chamber test bench at four different irradiation angles according to a dynamic test procedure. In addition, a conventional wall construction (CWC) has been measured. At SATIS’ design angle of 19 °, the SATIS wall construction shows a solar gain (SG) of 394.5 Wh/m², while the SG of the CWC amounts to only 25.4 Wh/m². The validated transient model of the SATIS wall construction showed that, at the end of the irradiation period of the dynamic test procedure (8 h), the solar heat penetrates to a depth of 253 mm and 111 mm inside the 385 mm thick brick wall masonry at the irradiation angles of 19 ° and 50 °, respectively. During the same time, the stored solar energy at 50 ° amounts to only 24.4 % of that stored at 19 °.