Kaskadierung für Flush Air Data Systeme
- Cascading for flush air data systems
Martin, Ingo; Moormann, Dieter (Thesis advisor); Stumpf, Eike (Thesis advisor)
Aachen : RWTH Aachen University (2023)
Dissertation / PhD Thesis
Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2023
In maritime rescue, small, vertical take-off capable unmanned aerial vehicles, so-called"VTOL-UAS", have great potential to achieve significant improvements in search speed,success rate and mission costs. For use in maritime rescue, unmanned aerial vehicles must first be made "seaworthy". The smaller and lighter an aircraft is, the greater theinfluence of wind and turbulence and the more important active gust load reduction isfor operational capability. To fulfil this task, a suitable measurement method for the local, unsteady inflow is required, which meets the special requirements of these aircraft: In slow and hovering flight, the airspeed is low compared to the ambient wind speed; this requires the measurement of high flow angles in both directions or a large field of view. A small aircraft is also susceptible to high-frequency gusts, which is why a high temporal resolution is needed. These requirements point to a FADS (Flush Air Data System) for measuring the approach flow; only the small measuring range of this technology hinders its use. Therefore, a concept for a cascaded FADS was developed, implemented in a practical example and investigated. By means of a new method for calibration and evaluation,the measuring range of FADS is drastically increased without impairing the accuracy orreal-time capability. In the example examined, the field of view was increased by afactor of 256 without adapting the hardware. This is achieved by gradually narrowing down the direction of the incident flow in acascade, while at the same time selecting only sensor data that are not disturbed by aflow separation for these incident flow conditions. This is an important contribution to the goal of using VTOL-UAS in sea rescue, at higher wind speeds and degrees of turbulence.
- Chair and Institute of Flight System Dynamics