Refine
Year of publication
Institute
- Fachbereich Luft- und Raumfahrttechnik (22) (remove)
Document Type
- Article (9)
- Conference Proceeding (8)
- Conference: Meeting Abstract (2)
- Conference Poster (1)
- Doctoral Thesis (1)
- Patent (1)
Keywords
- CFD (1)
- Drag estimation (1)
- Electrical Flight (1)
- Flight Mechanics (1)
- Flight Tests (1)
- Inflight Regeneration, Recuperation (1)
- Multirotor UAS (1)
- Propeller Aerodynamics (1)
- Wind milling (1)
- Wind tunnel experiments (1)
A multi-functional device applying for the safe maintenance at high-altitude on wind turbines
(2015)
This paper presents an approach to predicting the sound exposure on the ground caused by a landing aircraft with recuperating propellers. The noise source along the trajectory of a flight specified for a steeper approach is simulated based on measurements of sound power levels and additional parameters of a single propeller placed in a wind tunnel. To validate the measured data/measurement results, these simulations are also supported by overflight measurements of a test aircraft. It is shown that the simple source models of propellers do not provide fully satisfactory results since the sound levels are estimated too low. Nevertheless, with a further reference comparison, margins for an acceptable increase in the sound power level of the aircraft on its now steeper approach path could be estimated. Thus, in this case, a +7 dB increase in SWL would not increase the SEL compared to the conventional approach within only 2 km ahead of the airfield.