Auflistung nach Autor:in "Volkert, Andreas"

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Applicability of ISO standard 3744 to UA
(2022) Foerster, Jan; Treichel, Julia; Volkert, Andreas
Unmanned Aircraft Systems (UAS) are used for a variety of purposes. Especially the industrial or professional use of unmanned aircraft (UA) will lead to an increasing number of possible applications. The steadily rising number of UA raises the question of noise impact on the society from these vehicles. For the first time, an EU regulation provides a uniform noise rating for UA. It involves the introduction of a label for the guaranteed sound power level. This level is to be determined via EN ISO 3744:2010 by means of an enveloping surface method. Manufacturers are required to document the guaranteed sound power level as part of their CE marking. In addition, the EU regulation specifies a maximum permissible sound power level. The permitted level depends on the weight of the UA. Therefore, the German Environment Agency has started with acoustic investigations of UA. Various small multicopter) were used for the measurements in accordance with the EU regulation. This paper presents the results of the measurements and shows whether the requirements of the EU regulation are complied with. The challenges for users of the applicable measurement standard are also highlighted.
Assessing noise emissions of different drones in representative flight maneuvers
(2022) Volkert, Andreas; Treichel, Julia
This scientific publication focuses (i) on the specifications of the various drones used in this study, (ii) on the specifics of the varying flight maneuvers undertaken in the flight tests and (iii) on sharing the overall flight test experience. In the course of two different flight test campaigns conducted at DLRs National Experimental Test Center for Unmanned Aerial Systems in Cochstedt (Germany) in December 2020 and July 2021, numerous acoustical measurements have been recorded and later analyzed. Within this research initiative, the German Environmental Agency was responsible for providing the required measurement equipment, specifying the required UAV flight routes and analyzing the obtained research data. Quelle: elib.dlr.de
Noise measurements of unmanned aircraft vehicles: experiences, challenges and recommendations for standards taken from flight trials
(2023) Lieb, Teemu Joonas; Treichel, Julia; Volkert, Andreas
Over the past decades, drone technology has evolved to become a key element for various purposes in todayâ€Ìs globalized society. Besides the various technical challenges of implementing and utilizing their onboard systems as well as challenges with respect to the integration of these new airspace users into the existing airspace, one major factor for their success is their acceptance by the general public. In order to proactively address the concerns of the public with regards to the noise pollution of drones, the German Aerospace Center (DLR) together with the German Environment Agency (UBA) has undertaken flight trials to measure the noise emission levels of a variety of different types of drones. In particular, one flight test campaign was focused on measuring the sound pressure levels (i.e. pollution levels) of drones overflying static microphones, and another flight test campaign was focused on measuring the sound power levels (i.e. emission levels) of drones using a microphone hemisphere.This scientific publication focuses on three relevant elements of these flight trials and discusses the obtained experiences, mainly from a drone pilotsâ€Ì perspective, and provides recommendation for future regulations and standards. First, an overview of the measured drones is given including relevant vehicle specifics such as vehicle configuration, take-off mass, and their dimensions. Second, this publication describes the various flight scenarios including specific drone maneuvers that have been performed with the airborne drones during the flight tests. These maneuvers include hovering, forward level flights as well as take-off and landing maneuvers. Third, this publication highlights the challenges encountered when following the applicable EN ISO 3744 standard, which has been used for the second flight tests campaign as a reference document for setting up the measurement equipment required to perform the acoustical measurements. As a result, this publication lists several recommendations for establishing reasonable and practical requirements for future drone noise measurements taken from the obtained experiences coming from these flight tests. For example, one key recommendation is that the standards and regulations on how to measure noise levels of drones should be as detailed as possible and take the drone pilots perspective into account. In essence, this publication aims to pave the way for enhancing the public acceptance of drones by sharing obtained lessons learned from acoustical flight tests and provides recommendation for new regulations and standard that might be used for future drone noise measurements. © Copyright 2023 IEEE