Contribution
Aspects of the in-flight noise measurements of a cargo UAV
* Presenting author
Abstract:
As part of the holistic air mobility initiative in Bavaria, the Chair for Aircraft Systems (LLS) at the Technical University of Munich is conducting research on the project UmSiTrUL. The aim of the project is to enable environmentally friendly and safe operation of unmanned aerial vehicles (UAVs) in urban areas. The task of the LLS in the project consortium is the development of a noise emission model for a cargo UAV.This work focuses on noise emissions measurements from a cargo electric vertical take-off and landing (eVTOL) UAV. A centralized measurement system with eight microphones was used for the tests. For the adequate data recording of in-flight measurements, in addition to factors such as weather conditions, microphone pattern on the test field, and UAV trajectory there are challenges such as the Doppler effect and the effect of the wave reflections on the ground. Two arrangements of microphones were used in this work: ground-based microphones installed on metal plates and 10-meter vertical rods with microphones mounted on top of them. This paper examines both setups and discusses the impact of ground wave reflection for both configurations.