Article
Refine
Year of publication
Institute
- Fachbereich Luft- und Raumfahrttechnik (380) (remove)
Document Type
- Article (380) (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)
It is investigated whether a nonrotating lifting fan remaining uncovered during cruise flight, as opposed to being covered by a shutter system, can be realized with limited additional drag and loss of lift during cruise flight. A wind-tunnel study of a wing-embedded lifting fan has been conducted at the Side Wind Test Facility Göttingen of DLR, German Aerospace Center in Göttingen using force, pressure, and stereoscopic particle image velocimetry techniques. The study showed that a step on the lower side of the wing in front of the lifting fan duct increases the lift-to-drag ratio of the whole model by up to 25% for all positive angles of attack. Different sizes and inclinations of the step had limited influence on the surface pressure distribution. The data indicate that these parameters can be optimized to maximize the lift-to-drag ratio. A doubling of the curvature radius of the lifting fan duct inlet lip on the upper side of the wing affected the lift-to-drag ratio by less than 1%. The lifting fan duct inlet curvature can therefore be optimized to maximize the vertical fan thrust of the rotating lifting fan during hovering without affecting the cruise flight performance with a nonrotating fan.
The recently discovered first hyperbolic objects passing through the Solar System, 1I/’Oumuamua and 2I/Borisov, have raised the question about near term missions to Interstellar Objects. In situ spacecraft exploration of these objects will allow the direct determination of both their structure and their chemical and isotopic composition, enabling an entirely new way of studying small bodies from outside our solar system. In this paper, we map various Interstellar Object classes to mission types, demonstrating that missions to a range of Interstellar Object classes are feasible, using existing or near-term technology. We describe flyby, rendezvous and sample return missions to interstellar objects, showing various ways to explore these bodies characterizing their surface, dynamics, structure and composition. Their direct exploration will constrain their formation and history, situating them within the dynamical and chemical evolution of the Galaxy. These mission types also provide the opportunity to explore solar system bodies and perform measurements in the far outer solar system.
The recently discovered first high velocity hyperbolic objects passing through the Solar System, 1I/'Oumuamua and 2I/Borisov, have raised the question about near term missions to Interstellar Objects. In situ spacecraft exploration of these objects will allow the direct determination of both their structure and their chemical and isotopic composition, enabling an entirely new way of studying small bodies from outside our solar system. In this paper, we map various Interstellar Object classes to mission types, demonstrating that missions to a range of Interstellar Object classes are feasible, using existing or near-term technology. We describe flyby, rendezvous and sample return missions to interstellar objects, showing various ways to explore these bodies characterizing their surface, dynamics, structure and composition. Interstellar objects likely formed very far from the solar system in both time and space; their direct exploration will constrain their formation and history, situating them within the dynamical and chemical evolution of the Galaxy. These mission types also provide the opportunity to explore solar system bodies and perform measurements in the far outer solar system.
This paper examines the positive and negative aspects of a range of interpretations of nearest-neighbours models. Measures-oriented and distributionoriented verification methods are applied to categorial, probabilistic and descriptive interpretations of nearest neighbours used operationally in avalanche forecasting in Scotland and Switzerland. The dependence of skill and accuracy measures on base rate is illustrated. The purpose of the forecast and the definition of events are important variables in determining the quality of the forecast. A discussion of the application of different interpretations in operational avalanche forecasting is presented.