Article
Refine
Year of publication
Institute
- Fachbereich Luft- und Raumfahrttechnik (379) (remove)
Document Type
- Article (379) (remove)
Keywords
- avalanche (5)
- snow (3)
- Aeroelasticity (2)
- CFD (2)
- Drinfeld modules (2)
- Karosseriebau (2)
- Kraftfahrzeugbau (2)
- Obstacle avoidance (2)
- Path planning (2)
- Sportwagen (2)
- Studentenprojekt (2)
- Transcendence (2)
- UAV (2)
- Virtuelle Fahrzeugentwicklung (2)
- car body construction (2)
- t-modules (2)
- 1P hub loads (1)
- Active humidity control (1)
- Actuator disk modelling (1)
- Aircraft sizing (1)
- Antarctic Glaciology (1)
- Automotive safety approach (1)
- Autonomy (1)
- Avalanche (1)
- BET (1)
- Bio-inspired systems (1)
- Blade element method (1)
- CFD propeller simulation (1)
- CO2 emission reduction targets (1)
- Centrifugal twisting moment (1)
- Commercial Vehicle (1)
- Common Rail Injection System (1)
- Cost function (1)
- Crashworthiness (1)
- DLR-ESTEC GOSSAMER roadmap for solar sailing (1)
- Diesel Engine (1)
- Drag estimation (1)
- Driving cycle recognition (1)
- Dry-low-NOx (DLN) combustion (1)
- ECMS (1)
- Electrochemical impedance spectroscopy (1)
- Energy management strategies (1)
- European Transient Cycle (1)
- Extension–twist coupling (1)
- Extraterrestrial Glaciology (1)
- Fault detection (1)
- Finite element method (1)
- Flutter (1)
- Fuel cell (1)
- Full-vehicle crash test (1)
- GOSSAMER-1 (1)
- Glaciological instruments and methods (1)
- Health management system (1)
- High hydrogen combustion (1)
- Higher derivations (1)
- Human factors (1)
- Hydrogen combustion (1)
- Hydrogen gas turbine (1)
- Hyperdifferentials (1)
- Impedance analysis (1)
- Interstellar objects (1)
- Lifting propeller (1)
- Local path planning (1)
- Low-field NMR (1)
- Micromix combustion (1)
- Missions (1)
- Multi-objective optimization (1)
- Multirotor UAS (1)
- NMR exchange relaxometry (1)
- Non-model-based Evaluation (1)
- Online diagnostic (1)
- PEM fuel cell (1)
- Parasitic drag (1)
- Periods (1)
- Predictive battery discharge (1)
- Propeller (1)
- Propeller aerodynamics (1)
- Propeller elasticity (1)
- Propeller performance (1)
- Propeller whirl flutter (1)
- RAMMS (1)
- Relative air humidity (1)
- Selective Catalytic Reduction (1)
- Small spacecraft (1)
- Snow (1)
- Solar sail (1)
- Subclacial exploration (1)
- Subglacial lakes (1)
- Trajectories (1)
- Trapeze effect (1)
- Unmanned aerial vehicles (1)
- Unsteady aerodynamics (1)
- Wind milling (1)
- Wind tunnel experiments (1)
- adaptive systems (1)
- artificial intelligence (1)
- assistance system (1)
- debris flow (1)
- eVTOL development (1)
- eVTOL safety (1)
- fuel cell vehicle (1)
- gamification (1)
- intelligent control (1)
- intelligent energy management (1)
- machine learning (1)
- manufacturing (1)
- optimization system (1)
There is common agreement within the scientific community that in order to understand our local galactic environment it will be necessary to send a spacecraft into the region beyond the solar wind termination shock. Considering distances of 200 AU for a new mission, one needs a spacecraft traveling at a speed of close to 10 AU/yr in order to keep the mission duration in the range of less than 25 yrs, a transfer time postulated by European Space Agency (ESA). Two propulsion options for the mission have been proposed and discussed so far: the solar sail propulsion and the ballistic/radioisotope-electric propulsion (REP). As a further alternative, we here investigate a combination of solar-electric propulsion (SEP) and REP. The SEP stage consists of six 22-cms diameter RIT-22 ion thrusters working with a high specific impulse of 7377 s corresponding to a positive grid voltage of 5 kV. Solar power of 53 kW at begin of mission (BOM) is provided by a lightweight solar array.
The eVTOL industry is a rapidly growing mass market expected to start in 2024. eVTOL compete, caused by their predicted missions, with ground-based transportation modes, including mainly passenger cars. Therefore, the automotive and classical aircraft design process is reviewed and compared to highlight advantages for eVTOL development. A special focus is on ergonomic comfort and safety. The need for further investigation of eVTOL’s crashworthiness is outlined by, first, specifying the relevance of passive safety via accident statistics and customer perception analysis; second, comparing the current state of regulation and certification; and third, discussing the advantages of integral safety and applying the automotive safety approach for eVTOL development. Integral safety links active and passive safety, while the automotive safety approach means implementing standardized mandatory full-vehicle crash tests for future eVTOL. Subsequently, possible crash impact conditions are analyzed, and three full-vehicle crash load cases are presented.
The predictive control of commercial vehicle energy management systems, such as vehicle thermal management or waste heat recovery (WHR) systems, are discussed on the basis of information sources from the field of environment recognition and in combination with the determination of the vehicle system condition.
In this article, a mathematical method for predicting the exhaust gas mass flow and the exhaust gas temperature is presented based on driving data of a heavy-duty vehicle. The prediction refers to the conditions of the exhaust gas at the inlet of the exhaust gas recirculation (EGR) cooler and at the outlet of the exhaust gas aftertreatment system (EAT). The heavy-duty vehicle was operated on the motorway to investigate the characteristic operational profile. In addition to the use of road gradient profile data, an evaluation of the continuously recorded distance signal, which represents the distance between the test vehicle and the road user ahead, is included in the prediction model. Using a Fourier analysis, the trajectory of the vehicle speed is determined for a defined prediction horizon.
To verify the method, a holistic simulation model consisting of several hierarchically structured submodels has been developed. A map-based submodel of a combustion engine is used to determine the EGR and EAT exhaust gas mass flows and exhaust gas temperature profiles. All simulation results are validated on the basis of the recorded vehicle and environmental data. Deviations from the predicted values are analyzed and discussed.